# UK Smart Wall Switch Back Board ## Description UK Smart Wall Switch Back Board: 802.3af PoE-powered 65x65mm relay and energy-monitoring back board with RJ45, isolated 5V/3.3V rails, W5500 Ethernet, BL0942 metering, touch ICs, and 12-pin pogo interface. ## Project Details - **Owner:** leisgordon - **Created:** 5/15/2026 - **Last Updated:** 6/2/2026 - **Visibility:** Public ## Key Components ### BR1 — [HD01-T](https://www.flux.ai/adrian95/hd01-t.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.diodes.com/datasheet/download/HD01.pdf - Role Details: 100V 1A bridge rectifier for PoE input pair rectification - Mount: Surface Mount - Manufacturer Name: Diodes - Package or Case Code: 4-SMD - Manufacturer Part Number: HD01-T - Part Type: Diodes - Role: Rectification **Pins:** - - [pin 3] - + [pin 1] - ~_1 [pin 2] - ~_2 [pin 4] ### BR2 — [HD01-T](https://www.flux.ai/adrian95/hd01-t.md) - Mount: Surface Mount - Datasheet URL: https://www.diodes.com/datasheet/download/HD01.pdf - Role Details: 100V 1A bridge rectifier for PoE input pair rectification - Role: Rectification - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: HD01-T - Package or Case Code: 4-SMD - Part Type: Diodes - Manufacturer Name: Diodes **Pins:** - - [pin 3] - + [pin 1] - ~_1 [pin 2] - ~_2 [pin 4] ### D1 — [1N4007RLG](https://www.flux.ai/jecstronic/1n4007rlg~07j.md) - Part Type: Diode - Manufacturer Part Number: 1N4007RLG - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.onsemi.com/pdf/datasheet/1n4001-d.pdf - Manufacturer Name: onsemi - Role Details: Coil suppression diode for relay driver - Role: Flyback Diode **Pins:** - anode [pin 2] - cathode [pin 1] ### D2 — [1N4007RLG](https://www.flux.ai/jecstronic/1n4007rlg~07j.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: onsemi - Datasheet URL: https://www.onsemi.com/pdf/datasheet/1n4001-d.pdf - Role Details: Coil suppression diode for relay driver - Part Type: Diode - Manufacturer Part Number: 1N4007RLG - Role: Flyback Diode **Pins:** - anode [pin 2] - cathode [pin 1] ### D3 — [1N4007RLG](https://www.flux.ai/jecstronic/1n4007rlg~07j.md) - Manufacturer Part Number: 1N4007RLG - Part Type: Diode - Role: Flyback Diode - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.onsemi.com/pdf/datasheet/1n4001-d.pdf - Role Details: Coil suppression diode for relay driver - Manufacturer Name: onsemi **Pins:** - anode [pin 2] - cathode [pin 1] ### D4 — [SMAJ58A](https://www.flux.ai/lcsc/smaj58a~676s.md) - Product Info Url: https://lcsc.com/product-detail/TVS_Shikues-SMAJ58A_C499822.html - LCSC Part Number: C499822 - Role Details: 58V TVS across rectified PoE input as TPS23751 recommended input protection - Manufacturer Part Number: SMAJ58A - Manufacturer Name: SHIKUES(时科) - Role: Protection - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Shikues-SMAJ58A_C499822.pdf - Part Type: TVS - JLCPCB Part Class: Extended Part - Package or Case Code: SMA_L4.4-W2.6-LS5.0-R-RD **Pins:** - A [pin 1] - K [pin 2] ### D5 — [SSC54-E3/57T](https://www.flux.ai/adrian95/ssc54-e357t~hzn.md) - Manufacturer Name: Vishay General Semiconductor - Diodes Division - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SSC54-E3/57T - Role: Rectification - Datasheet URL: https://www.vishay.com/docs/88885/ssc53l.pdf - Part Type: Diode - Role Details: 40V 5A Schottky rectifier for 5V 2A flyback output **Pins:** - A [pin 2] - K [pin 1] ### J1 — [HR911105A](https://www.flux.ai/jecstronic/hr911105a~ae9.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: HR911105A - Part Type: Connector - Role: RJ45 MagJack - Datasheet URL: https://datasheet.lcsc.com/lcsc/1811141815_HANRUN-Zhongshan-HanRun-Elec-HR911105A_C12074.pdf - Manufacturer Name: HANRUN - Role Details: Ethernet connector with integrated magnetics and LEDs for PoE input and W5500 PHY connection **Pins:** - ~ [pin 2] - ~ [pin 6] - ~ [pin 5] - ~ [pin 11] - ~ [pin 12] - ~ [pin 8] - ~ [pin 1] - ~ [pin 4] - ~ [pin 9] - ~ [pin 3] - ~ [pin 10] - SHIELD [pin 15] - SHIELD [pin 16] ### J10 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Voltage Rating: 12V - Part Type: Connector - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating - Manufacturer Part Number: CPG-45-TH-TR - Operating Temperature: -40 85 °C - Connector Type: Board to Board Connectors - Role: Pogo Contact - Current Rating: 1A **Pins:** - 1 [pin 1] ### J11 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Part Type: Connector - Voltage Rating: 12V - Role: Pogo Contact - Operating Temperature: -40 85 °C - Manufacturer Part Number: CPG-45-TH-TR - Connector Type: Board to Board Connectors - Current Rating: 1A - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating **Pins:** - 1 [pin 1] ### J12 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Voltage Rating: 12V - Part Type: Connector - Connector Type: Board to Board Connectors - Current Rating: 1A - Manufacturer Part Number: CPG-45-TH-TR - Role: Pogo Contact - Operating Temperature: -40 85 °C - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating **Pins:** - 1 [pin 1] ### J13 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Current Rating: 1A - Connector Type: Board to Board Connectors - Manufacturer Part Number: CPG-45-TH-TR - Operating Temperature: -40 85 °C - Part Type: Connector - Role: Pogo Contact - Voltage Rating: 12V - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating **Pins:** - 1 [pin 1] ### J14 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Part Type: Connector - Voltage Rating: 12V - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating - Role: Pogo Contact - Manufacturer Part Number: CPG-45-TH-TR - Operating Temperature: -40 85 °C - Current Rating: 1A - Connector Type: Board to Board Connectors **Pins:** - 1 [pin 1] ### J15 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating - Voltage Rating: 12V - Part Type: Connector - Operating Temperature: -40 85 °C - Manufacturer Part Number: CPG-45-TH-TR - Current Rating: 1A - Connector Type: Board to Board Connectors - Role: Pogo Contact **Pins:** - 1 [pin 1] ### J2 — [691412320003](https://www.flux.ai/adrian95/691412320003.md) - Manufacturer Name: Würth Elektronik - Current Rating: 4A - Role Details: 3-position 3.5mm pluggable terminal block for one mains lighting circuit; closest Flux library substitute for Phoenix Contact 1984028 PT 1,5/3-PVH-3,5 - Mount: Through Hole - Part Type: Connector - Role: Mains Screw Terminal - Datasheet URL: https://www.we-online.com/components/products/datasheet/691412320003.pdf - Connector Positions: 3 - Voltage Rating: 300V - Substitute Manufacturer Part Number: Phoenix Contact 1984028 / PT 1,5/3-PVH-3,5 requested; exact Flux part unavailable - Connector Pitch: 3.81mm - Manufacturer Part Number: 691412320003 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### J3 — [691412320003](https://www.flux.ai/adrian95/691412320003.md) - Connector Pitch: 3.81mm - Substitute Manufacturer Part Number: Phoenix Contact 1984028 / PT 1,5/3-PVH-3,5 requested; exact Flux part unavailable - Manufacturer Name: Würth Elektronik - Part Type: Connector - Role Details: 3-position 3.5mm pluggable terminal block for one mains lighting circuit; closest Flux library substitute for Phoenix Contact 1984028 PT 1,5/3-PVH-3,5 - Mount: Through Hole - Connector Positions: 3 - Datasheet URL: https://www.we-online.com/components/products/datasheet/691412320003.pdf - Role: Mains Screw Terminal - Voltage Rating: 300V - Current Rating: 4A - Manufacturer Part Number: 691412320003 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### J4 — [691412320003](https://www.flux.ai/adrian95/691412320003.md) - Current Rating: 4A - Manufacturer Name: Würth Elektronik - Part Type: Connector - Role: Mains Screw Terminal - Mount: Through Hole - Connector Pitch: 3.81mm - Datasheet URL: https://www.we-online.com/components/products/datasheet/691412320003.pdf - Substitute Manufacturer Part Number: Phoenix Contact 1984028 / PT 1,5/3-PVH-3,5 requested; exact Flux part unavailable - Role Details: 3-position 3.5mm pluggable terminal block for one mains lighting circuit; closest Flux library substitute for Phoenix Contact 1984028 PT 1,5/3-PVH-3,5 - Connector Positions: 3 - Manufacturer Part Number: 691412320003 - Voltage Rating: 300V **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### J5 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating - Manufacturer Part Number: CPG-45-TH-TR - Operating Temperature: -40 85 °C - Current Rating: 1A - Connector Type: Board to Board Connectors - Part Type: Connector - Role: Pogo Contact - Voltage Rating: 12V **Pins:** - 1 [pin 1] ### J6 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating - Operating Temperature: -40 85 °C - Manufacturer Part Number: CPG-45-TH-TR - Current Rating: 1A - Connector Type: Board to Board Connectors - Role: Pogo Contact - Voltage Rating: 12V - Part Type: Connector **Pins:** - 1 [pin 1] ### J7 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Part Type: Connector - Voltage Rating: 12V - Manufacturer Part Number: CPG-45-TH-TR - Operating Temperature: -40 85 °C - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating - Current Rating: 1A - Connector Type: Board to Board Connectors - Role: Pogo Contact **Pins:** - 1 [pin 1] ### J8 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Operating Temperature: -40 85 °C - Manufacturer Part Number: CPG-45-TH-TR - Connector Type: Board to Board Connectors - Current Rating: 1A - Role: Pogo Contact - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating - Voltage Rating: 12V - Part Type: Connector **Pins:** - 1 [pin 1] ### J9 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Voltage Rating: 12V - Role: Pogo Contact - Part Type: Connector - Current Rating: 1A - Connector Type: Board to Board Connectors - Manufacturer Part Number: CPG-45-TH-TR - Operating Temperature: -40 85 °C - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating **Pins:** - 1 [pin 1] ### K1 — [SRD-05VDC-SL-C](https://www.flux.ai/vasy_skral/srd-05vdc-sl-c~go1.md) - Role Details: 5V SPDT relay for one lighting circuit - Manufacturer Part Number: SRD-05VDC-SL-C - Manufacturer Name: Ningbo Songle Relay - Part Type: Relay - Datasheet URL: https://www.circuitbasics.com/wp-content/uploads/2015/11/SRD-05VDC-SL-C-Datasheet.pdf - Role: Mains Relay **Pins:** - A1 [pin A1] - A2 [pin A2] - COM [pin COM] - NC [pin NC] - NO [pin NO] ### K2 — [SRD-05VDC-SL-C](https://www.flux.ai/vasy_skral/srd-05vdc-sl-c~go1.md) - Manufacturer Part Number: SRD-05VDC-SL-C - Role Details: 5V SPDT relay for one lighting circuit - Manufacturer Name: Ningbo Songle Relay - Role: Mains Relay - Datasheet URL: https://www.circuitbasics.com/wp-content/uploads/2015/11/SRD-05VDC-SL-C-Datasheet.pdf - Part Type: Relay **Pins:** - A1 [pin A1] - A2 [pin A2] - COM [pin COM] - NC [pin NC] - NO [pin NO] ### K3 — [SRD-05VDC-SL-C](https://www.flux.ai/vasy_skral/srd-05vdc-sl-c~go1.md) - Manufacturer Part Number: SRD-05VDC-SL-C - Role: Mains Relay - Part Type: Relay - Datasheet URL: https://www.circuitbasics.com/wp-content/uploads/2015/11/SRD-05VDC-SL-C-Datasheet.pdf - Role Details: 5V SPDT relay for one lighting circuit - Manufacturer Name: Ningbo Songle Relay **Pins:** - A1 [pin A1] - A2 [pin A2] - COM [pin COM] - NC [pin NC] - NO [pin NO] ### P1 — [CPG-45-TH-TR](https://www.flux.ai/f-franzin/cpg-45-th-tr~ed.md) - Part Type: Connector - Role Details: One spring-loaded contact in the 12-position front-board pogo array; 12V 1A rating - Voltage Rating: 12V - Manufacturer Part Number: CPG-45-TH-TR - Operating Temperature: -40 85 °C - Role: Pogo Contact - Current Rating: 1A - Connector Type: Board to Board Connectors **Pins:** - 1 [pin 1] ### Q1 — [PC817X2NSZ9F](https://www.flux.ai/adrian95/pc817x2nsz9f-8aiu3~i8d.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Relay-control isolation channel - Manufacturer Part Number: PC817X2NSZ9F - Role: Optocoupler - Part Type: Isolator - Manufacturer Name: SHARP/Socle Technology - Datasheet URL: http://www.socle-tech.com/doc/IC%20Channel%20Product/Optoelectronic%20Components/Photocoupler/PC817X_NSZ9FSeries_SPEC.pdf **Pins:** - ANODE [pin 1] - CATHODE [pin 2] - COLLECTOR [pin 4] - EMITTER [pin 3] ### Q2 — [PC817X2NSZ9F](https://www.flux.ai/adrian95/pc817x2nsz9f-8aiu3~i8d.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Optocoupler - Manufacturer Part Number: PC817X2NSZ9F - Part Type: Isolator - Role Details: Relay-control isolation channel - Datasheet URL: http://www.socle-tech.com/doc/IC%20Channel%20Product/Optoelectronic%20Components/Photocoupler/PC817X_NSZ9FSeries_SPEC.pdf - Manufacturer Name: SHARP/Socle Technology **Pins:** - ANODE [pin 1] - CATHODE [pin 2] - COLLECTOR [pin 4] - EMITTER [pin 3] ### Q3 — [BC33740TA](https://www.flux.ai/adrian95/bc33740ta~5dt.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Relay Driver - Manufacturer Part Number: BC33740TA - Part Type: Transistor - Role Details: Low-side NPN driver for 5V relay coil - Datasheet URL: https://www.verical.com/datasheet/on-semiconductor-bjt---general-purpose-BC33740TA-4544246.pdf - Manufacturer Name: onsemi **Pins:** - B [pin 2] - C [pin 1] - E [pin 3] ### Q4 — [BC33740TA](https://www.flux.ai/adrian95/bc33740ta~5dt.md) - Manufacturer Part Number: BC33740TA - Role: Relay Driver - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: onsemi - Role Details: Low-side NPN driver for 5V relay coil - Part Type: Transistor - Datasheet URL: https://www.verical.com/datasheet/on-semiconductor-bjt---general-purpose-BC33740TA-4544246.pdf **Pins:** - B [pin 2] - C [pin 1] - E [pin 3] ### Q5 — [BC33740TA](https://www.flux.ai/adrian95/bc33740ta~5dt.md) - Part Type: Transistor - Datasheet URL: https://www.verical.com/datasheet/on-semiconductor-bjt---general-purpose-BC33740TA-4544246.pdf - Manufacturer Name: onsemi - Role: Relay Driver - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Low-side NPN driver for 5V relay coil - Manufacturer Part Number: BC33740TA **Pins:** - B [pin 2] - C [pin 1] - E [pin 3] ### Q6 — [IRF540NSTRLPBF](https://www.flux.ai/jharwinbarrozo/irf540nstrlpbf~d5.md) - Role Details: 100V N-channel MOSFET for primary flyback switch; verify gate charge and thermal performance - Manufacturer Part Number: IRF540NSTRLPBF - Datasheet URL: https://www.infineon.com/dgdl/irf540nspbf.pdf?fileId=5546d462533600a4015355e3a72819a3 - Part Type: Transistor - Role: Switching - Manufacturer Name: Texas Instruments Inc. **Pins:** - D [pin 2] - G [pin 1] - S [pin 3] ### T1 — [POE13P-50LD](https://www.flux.ai/jecstronic/poe13p-50ld~3v.md) - Manufacturer Name: Coilcraft - Role Details: 13W PoE flyback transformer, 5.0V 2.6A output; replacement for NA5730-AL to satisfy 5V 2A output requirement - Datasheet URL: https://www.mouser.com/datasheet/2/597/poe_ep-463527.pdf - Role: Flyback Transformer - Manufacturer Part Number: POE13P-50LD - Part Type: Transformer - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 5 [pin 5] - 6 [pin 6] - BIAS_1 [pin 1] - BIAS_2 [pin 2] - PRI_1 [pin 3] - PRI_2 [pin 4] - SEC_1 [pin 7] - SEC_2 [pin 8] - SEC_3 [pin 9] - SEC_4 [pin 10] ### U1 — [TPS23751PWPR](https://www.flux.ai/lcsc/tps23751pwpr~isno.md) - Role Details: Primary-side PoE powered-device interface and flyback controller for isolated 5V output - Role: PoE PD Controller - Package or Case Code: HTSSOP-16_L5.0-W4.4-P0.65-LS6.4-BL-EP - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010131_Texas-Instruments-TPS23751PWPR_C473395.pdf - LCSC Part Number: C473395 - Manufacturer Name: TI(德州仪器) - Product Info Url: https://lcsc.com/product-detail/Pre-ordered-Chips_Texas-Instruments-Texas-Instruments-TPS23751PWPR_C473395.html - Manufacturer Part Number: TPS23751PWPR **Pins:** - APD [pin 4] - ARTN [pin 14] - CLS [pin 3] - CS [pin 11] - CTL [pin 8] - DEN [pin 2] - EP [pin 17] - GATE [pin 13] - RT [pin 5] - RTN [pin 15] - SRD [pin 7] - SRT [pin 9] - T2P [pin 6] - VB [pin 10] - VC [pin 12] - VDD [pin 1] - VSS [pin 16] ### U10 — [PC817X2NSZ9F](https://www.flux.ai/adrian95/pc817x2nsz9f-8aiu3~i8d.md) - Role: Isolation - Datasheet URL: http://www.socle-tech.com/doc/IC%20Channel%20Product/Optoelectronic%20Components/Photocoupler/PC817X_NSZ9FSeries_SPEC.pdf - Manufacturer Name: SHARP/Socle Technology - Part Type: Isolator - Manufacturer Part Number: PC817X2NSZ9F - Role Details: Feedback optocoupler crossing isolation boundary for flyback control loop - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ANODE [pin 1] - CATHODE [pin 2] - COLLECTOR [pin 4] - EMITTER [pin 3] ### U2 — [AMS1117-3.3](https://www.flux.ai/vasy_skral/ams1117-33~34.md) - Symbol Style: Parametric - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Manufacturer Name: AMS - Datasheet URL: http://www.advanced-monolithic.com/pdf/ds1117.pdf - Role Details: 5V-to-3.3V post regulator; requires input/output capacitors and thermal check - Role: 3.3V LDO - Manufacturer Part Number: AMS1117-3.3 **Pins:** - GND [pin 1] - TAB(VOUT) [pin 4] - VIN [pin 3] - VOUT [pin 2] ### U3 — [W5500](https://www.flux.ai/vasy_skral/w5500~9ux.md) - Role: Ethernet Controller - Role Details: 10/100 Ethernet controller; SPI interface routed to 12-contact pogo interface - Manufacturer Part Number: W5500 - Symbol Style: parametric-v1 - Manufacturer Name: WIZnet - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Datasheet URL: https://docs.wiznet.io/img/products/w5500/w5500_ds_v109e.pdf **Pins:** - ~INT [pin 36] - ~RST [pin 37] - ~SCS [pin 32] - 1V2O [pin 22] - ACTLED [pin 27] - AGND [pin 3] - AGND [pin 16] - AGND [pin 14] - AGND [pin 48] - AGND [pin 9] - AGND [pin 19] - AVDD [pin 21] - AVDD [pin 15] - AVDD [pin 8] - AVDD [pin 11] - AVDD [pin 4] - AVDD [pin 17] - DNC [pin 7] - DUPLED [pin 26] - EXRES1 [pin 10] - GND [pin 29] - LINKLED [pin 25] - MISO [pin 34] - MOSI [pin 35] - NC [pin 46] - NC [pin 12] - NC [pin 47] - NC [pin 13] - PMODE0 [pin 45] - PMODE1 [pin 44] - PMODE2 [pin 43] - RSVD [pin 23] - RSVD [pin 42] - RSVD [pin 38] - RSVD [pin 39] - RSVD [pin 40] - RSVD [pin 41] - RXN [pin 5] - RXP [pin 6] - SCLK [pin 33] - SPDLED [pin 24] - TOCAP [pin 20] - TXN [pin 1] - TXP [pin 2] - VBG [pin 18] - VDD [pin 28] - XI/CLKIN [pin 30] - XO [pin 31] ### U4 — [BL0942](https://www.flux.ai/lcsc/bl0942~6cfm.md) - Manufacturer Name: BL(上海贝岭) - Role: Energy Monitor - Manufacturer Part Number: BL0942 - Part Type: PMIC - Current Regulation - LCSC Part Number: C2837510 - Role Details: Mains live-line metering IC for voltage/current/power monitoring - JLCPCB Part Class: Extended Part - Package or Case Code: SSOP-10_L4.9-W3.9-P1.00-LS6.0-BL **Pins:** - CF1 [pin 6] - GND [pin 5] - IN [pin 3] - IP [pin 2] - RX/SDI [pin 9] - SCLK_BPS [pin 8] - SEL [pin 7] - TX/SDO [pin 10] - VDD [pin 1] - VP [pin 4] ### U5 — [TTP223-BA6](https://www.flux.ai/lcsc/ttp223-ba6~g6w0.md) - Part Type: Touch Sensors - LCSC Part Number: C2757936 - Datasheet URL: https://www.lcsc.com/datasheet/C2757936.pdf?spm=wm.sxq.inf.ggs___wm.fly.bg.2.xh&lcsc_vid=QlUIU1dSRgJcA1FQQVUMBgdeElQIVldRQ1daVQdeQAcxVlNeR1JcUVdQRVJZUDsOAxUeFF5JWBYZEEoKFBINSQcJGk4%3D - JLCPCB Part Class: Extended Part - Role: Capacitive Touch Sensor - Role Details: One touch-key detector IC per lighting channel - Manufacturer Name: TONTEK(通泰) - Symbol Style: parametric-v1 - Manufacturer Part Number: TTP223-BA6 - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR **Pins:** - AHLB [pin 4] - I [pin 3] - Q [pin 1] - TOG [pin 6] - VDD [pin 5] - VSS [pin 2] ### U6 — [TTP223-BA6](https://www.flux.ai/lcsc/ttp223-ba6~g6w0.md) - Datasheet URL: https://www.lcsc.com/datasheet/C2757936.pdf?spm=wm.sxq.inf.ggs___wm.fly.bg.2.xh&lcsc_vid=QlUIU1dSRgJcA1FQQVUMBgdeElQIVldRQ1daVQdeQAcxVlNeR1JcUVdQRVJZUDsOAxUeFF5JWBYZEEoKFBINSQcJGk4%3D - JLCPCB Part Class: Extended Part - LCSC Part Number: C2757936 - Part Type: Touch Sensors - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR - Manufacturer Part Number: TTP223-BA6 - Role Details: One touch-key detector IC per lighting channel - Manufacturer Name: TONTEK(通泰) - Symbol Style: parametric-v1 - Role: Capacitive Touch Sensor **Pins:** - AHLB [pin 4] - I [pin 3] - Q [pin 1] - TOG [pin 6] - VDD [pin 5] - VSS [pin 2] ### U7 — [TTP223-BA6](https://www.flux.ai/lcsc/ttp223-ba6~g6w0.md) - Role: Capacitive Touch Sensor - Manufacturer Part Number: TTP223-BA6 - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR - Manufacturer Name: TONTEK(通泰) - Symbol Style: parametric-v1 - Datasheet URL: https://www.lcsc.com/datasheet/C2757936.pdf?spm=wm.sxq.inf.ggs___wm.fly.bg.2.xh&lcsc_vid=QlUIU1dSRgJcA1FQQVUMBgdeElQIVldRQ1daVQdeQAcxVlNeR1JcUVdQRVJZUDsOAxUeFF5JWBYZEEoKFBINSQcJGk4%3D - JLCPCB Part Class: Extended Part - Role Details: One touch-key detector IC per lighting channel - Part Type: Touch Sensors - LCSC Part Number: C2757936 **Pins:** - AHLB [pin 4] - I [pin 3] - Q [pin 1] - TOG [pin 6] - VDD [pin 5] - VSS [pin 2] ### U8 — [PC817X2NSZ9F](https://www.flux.ai/adrian95/pc817x2nsz9f-8aiu3~i8d.md) - Part Type: Isolator - Datasheet URL: http://www.socle-tech.com/doc/IC%20Channel%20Product/Optoelectronic%20Components/Photocoupler/PC817X_NSZ9FSeries_SPEC.pdf - Manufacturer Name: SHARP/Socle Technology - License: https://creativecommons.org/licenses/by/4.0/ - Role: Optocoupler - Role Details: Relay-control isolation channel - Manufacturer Part Number: PC817X2NSZ9F **Pins:** - ANODE [pin 1] - CATHODE [pin 2] - COLLECTOR [pin 4] - EMITTER [pin 3] ### U9 — [TL431AIL3T](https://www.flux.ai/adrian95/tl431ail3t~xnq.md) - Role: Voltage Reference - Role Details: TL431 feedback reference for 5V flyback output regulation - Manufacturer Name: STMicroelectronics - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/2d/27/af/41/03/e2/44/8e/CD00000986.pdf/files/CD00000986.pdf/jcr:content/translations/en.CD00000986.pdf - Part Type: Integrated Circuit - Manufacturer Part Number: TL431AIL3T - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 3] - K [pin 1] - REF [pin 2] ### Y1 — [NX3225GA-25MHZ-STD-CRG-2](https://www.flux.ai/lcsc/nx3225ga-25mhz-std-crg-2~jt15.md) - LCSC Part Number: C438901 - Manufacturer Part Number: NX3225GA-25MHZ-STD-CRG-2 - Role Details: 25MHz crystal for W5500 XI/XO pins - Manufacturer Name: NDK - Package or Case Code: OSC-SMD_4P-L3.2-W2.5-BL - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_NDK-NX3225GA-25MHZ-STD-CRG-2_C438901.pdf - Role: Crystal - Product Info Url: https://lcsc.com/product-detail/SMD-Crystal-Resonators_NDK-NX3225GA-STD-CRG-2-25MHZ_C438901.html - Part Type: Crystals **Pins:** - 1 [pin 1] - 3 [pin 3] - GND [pin 4] - GND [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/leisgordon/uk-smart-wall-switch-back-board~xz](https://www.flux.ai/leisgordon/uk-smart-wall-switch-back-board~xz).* --- *Generated from [https://www.flux.ai/leisgordon/uk-smart-wall-switch-back-board~xz](https://www.flux.ai/leisgordon/uk-smart-wall-switch-back-board~xz)*