# QGEN-OZONE-MAIN 8731 ## Description Microcontroller-based ozone generator control board for 12 V or 24 V DC input, drawing roughly 3.5 A at 12 V or 1.8 A at 24 V, with matched VIN-powered field devices, protected input, regulation, ATMEGA328PB control, pressure/flow sensing, MOSFET-switched load outputs, programming/debug headers, and status indicators. ## Project Details - **Owner:** qgen-joshua - **Created:** 7/1/2026 - **Last Updated:** 7/1/2026 - **Visibility:** Public - **Implementation Details:** High-current input/load paths must be verified for 12 V/3.5 A and 24 V/1.8 A operation. Existing F1 SMD1812B075TF/33 appears undersized for this envelope and should be replaced or re-rated before manufacturing. - **Operating Voltage:** VIN selectable 12 V or 24 V DC; connected J1/J2/J3 field devices are matched to the selected input voltage. - **Power Requirements:** Input/load envelope: approximately 3.5 A at 12 V (42 W) or 1.8 A at 24 V (43.2 W). Design input path for at least 5.25 A continuous-equivalent margin at 12 V using 1.5x sizing. ## Key Components ### D1 — [SMBJ28CA-TR](https://www.flux.ai/lcsc/smbj28ca-tr~itb5.md) - Manufacturer Part Number: SMBJ28CA-TR - Product Info Url: https://lcsc.com/product-detail/TVS_STMicroelectronics_SMBJ28CA-TR_SMBJ28CA-TR_C133664.html - LCSC Part Number: C133664 - Manufacturer Name: ST(意法半导体) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_STMicroelectronics-SMBJ28CA-TR_C133664.pdf - Package or Case Code: SMB_L4.6-W3.6-LS5.3-BI - JLCPCB Part Class: Extended Part - Part Type: TVS **Pins:** - 1 [pin 1] - 2 [pin 2] ### D2 — [SS54-HF](https://www.flux.ai/adrian95/ss54-hf~mm.md) - Current: 5A - Datasheet URL: https://jlc-prod-smt.oss-eu-central-1.aliyuncs.com/smtDataManualFile/8586176368496791552-C84171.pdf?response-content-disposition=attachment%3B%20filename%3DC84171.pdf%3B%20filename%2A%3DUTF-8%27%27C84171.pdf&x-oss-date=20260601T203343Z&x-oss-expires=3600&x-oss-security-token=CAISgAN1q6Ft5B2yfSjIr5n4JejwuLAX3fSvaU7HlVEkOcJBuYjhrDz2IHhMdHJsAOodtv0%2FmmhT6PkclqRLcbhpcmfjV%2BZHzLB8qaZCuktB4J7b16cNrbH4M4H6aXeirtuwDsz9SNTCALjPD3nPii50x5bjaDymRCbLGJaViJlhHLN1Ow6jdmhpCctxLAlvo9NgFxm3D%2Fu2NQPwiWf9FVdhvhEG6Vly8qOi2MaRmFy8yFTx0b0SvJ%2BjYMrmPctoN9JnSdC5mfdzau3a1TJ84gRD0a5wkaVA1zbDs5bfISEIuUzebreLqY03dV4mOvdqIcMe8qigz88fk%2FfIioH6xyxKOexoSCnFTOiiupCcQLPyao9jLu6iayqViY7QaIOTqQohZmkAMwVOasAsI3Ngh4zF97Qt0cVNkXO9gWfLI8DtuMleWspmVtpSgnSgc5lCkRRYwGs1287ugXlSQzo890KPDAEovaKCnZ2ZSfh7Y4sNknI6i%2Bfc2Se2MIkIPZY9oaKWD5sagAGigSf3qoaNlOdnMpDrFQrGK8nF19WCwhZeOvraXTcslMcDp56eSfObfVArt7GTCg%2FQJhEgV%2F9j9C%2F4NnKBD7idNQNWPdAY8veywO4zdcW4%2Bt79sdo3%2B6J%2FGdZUw8yaTwuHGF5Ump5VdzGQU4So89uVrsN2zFFdTfJk7At5vQynsiAA&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=STS.NZMnRDUo6j6DkhvqQq5MmVMJN%2F20260601%2Feu-central-1%2Foss%2Faliyun_v4_request&x-oss-signature=e2845cb70fa2d8edea438e79c38d3223b5e85485bf07961a0956302ece3ab55d - Manufacturer Part Number: SK54 - Role: Reverse Polarity Protection - License: https://creativecommons.org/licenses/by/4.0/ - LCSC Part Number: C84171 - Role Details: Must be thermally checked at 3.5 A worst-case input current. If forward-drop dissipation is excessive, replace with lower-loss ideal-diode or P-channel MOSFET reverse-protection. - Manufacturer Name: DIYI - Part Type: Diode **Pins:** - A [pin 2] - K [pin 1] ### D3 — [SS34](https://www.flux.ai/collinsemasi/ss34~qf.md) - Manufacturer Part Number: DSK34 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microsemi - Part Type: Diode - Datasheet URL: https://jlc-prod-smt.oss-eu-central-1.aliyuncs.com/smtDataManualFile/8588885197404721152-C85269.pdf?response-content-disposition=attachment%3B%20filename%3DC85269.pdf%3B%20filename%2A%3DUTF-8%27%27C85269.pdf&x-oss-date=20260601T203642Z&x-oss-expires=3600&x-oss-security-token=CAISgAN1q6Ft5B2yfSjIr5n4JejwuLAX3fSvaU7HlVEkOcJBuYjhrDz2IHhMdHJsAOodtv0%2FmmhT6PkclqRLcbhpcmfjV%2BZHzLB8qaZCuktB4J7b16cNrbH4M4H6aXeirtuwDsz9SNTCALjPD3nPii50x5bjaDymRCbLGJaViJlhHLN1Ow6jdmhpCctxLAlvo9NgFxm3D%2Fu2NQPwiWf9FVdhvhEG6Vly8qOi2MaRmFy8yFTx0b0SvJ%2BjYMrmPctoN9JnSdC5mfdzau3a1TJ84gRD0a5wkaVA1zbDs5bfISEIuUzebreLqY03dV4mOvdqIcMe8qigz88fk%2FfIioH6xyxKOexoSCnFTOiiupCcQLPyao9jLu6iayqViY7QaIOTqQohZmkAMwVOasAsI3Ngh4zF97Qt0cVNkXO9gWfLI8DtuMleWspmVtpSgnSgc5lCkRRYwGs1287ugXlSQzo890KPDAEovaKCnZ2ZSfh7Y4sNknI6i%2Bfc2Se2MIkIPZY9oaKWD5sagAGigSf3qoaNlOdnMpDrFQrGK8nF19WCwhZeOvraXTcslMcDp56eSfObfVArt7GTCg%2FQJhEgV%2F9j9C%2F4NnKBD7idNQNWPdAY8veywO4zdcW4%2Bt79sdo3%2B6J%2FGdZUw8yaTwuHGF5Ump5VdzGQU4So89uVrsN2zFFdTfJk7At5vQynsiAA&x-oss-signature-version=OSS4-HMAC-SHA256&x-oss-credential=STS.NZMnRDUo6j6DkhvqQq5MmVMJN%2F20260601%2Feu-central-1%2Foss%2Faliyun_v4_request&x-oss-signature=4231879e7929b8573546858653815ad50aaba653fa0f74c99b53f9f94ba88a43 - LCSC Part Number: C41029 **Pins:** - A [pin 2] - C [pin 1] ### D4 — [SMBJ30CA-HF](https://www.flux.ai/lcsc/smbj30ca-hf~1xqm.md) - JLCPCB Part Class: Extended Part - Package or Case Code: SMB_L4.3-W3.6-LS5.4-BI - Manufacturer Part Number: SMBJ30CA/TR13 - Manufacturer Name: Brightking - Part Type: TVS **Pins:** - 1 [pin 1] - 2 [pin 2] ### D5 — [DO-214AC](https://www.flux.ai/jedec-jep95-packages/do-214ac~z9.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: US1M - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds16008.pdf - Package or Case Code: DO-214AC - Part Type: Diode - Manufacturer Name: Diodes **Pins:** - A [pin 2] - K [pin 1] ### D6 — [DO-214AC](https://www.flux.ai/jedec-jep95-packages/do-214ac~z9.md) - Manufacturer Part Number: US1M - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Diode - Manufacturer Name: Diodes - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds16008.pdf - Package or Case Code: DO-214AC **Pins:** - A [pin 2] - K [pin 1] ### D7 — [DO-214AC](https://www.flux.ai/jedec-jep95-packages/do-214ac~z9.md) - Package or Case Code: DO-214AC - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds16008.pdf - Manufacturer Name: Diodes - Part Type: Diode - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: US1M **Pins:** - A [pin 2] - K [pin 1] ### F1 — [30GR](https://www.flux.ai/lcsc/30gr~j5yq.md) - Manufacturer Part Number: 1812L200/30GR - Package or Case Code: F1812 - Manufacturer Name: LUTE(陆特) - JLCPCB Part Class: Extended Part - LCSC Part Number: C18198342 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [B2P-VH(LF)(SN)](https://www.flux.ai/qgen-joshua/b2p-vhlfsn~ds.md) - Connector Positions: 2 - Current Rating: 10A - JLCPCB Part Class: Extended Part - LCSC Part Number: C160315 - Connector Gender: Male - Connector Type: Header - Connector Pitch: 3.96mm - Part Type: Wire To Board / Wire To Wire Connector - Connector Rows: 1 - Manufacturer Part Number: B2P-VH(LF)(SN) - Package or Case Code: CONN-TH_B2P-VH-LF-SN - Voltage Rating: 250V - Operating Temperature: -25 ~ +85℃ - Manufacturer Name: JST - Product Info Url: https://lcsc.com/product-detail/_JST_B2P-VH-LF-SN_B2P-VH-LF-SN_C160315.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B2P-VH-LF-SN_C160315.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] ### J2 — [B2P-VH(LF)(SN)](https://www.flux.ai/qgen-joshua/b2p-vhlfsn~ds.md) - LCSC Part Number: C160315 - Connector Gender: Male - Connector Type: Header - Connector Pitch: 3.96mm - Part Type: Wire To Board / Wire To Wire Connector - Connector Rows: 1 - Connector Positions: 2 - Current Rating: 10A - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/_JST_B2P-VH-LF-SN_B2P-VH-LF-SN_C160315.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B2P-VH-LF-SN_C160315.pdf - Package or Case Code: CONN-TH_B2P-VH-LF-SN - Manufacturer Part Number: B2P-VH(LF)(SN) - Operating Temperature: -25 ~ +85℃ - Voltage Rating: 250V - Manufacturer Name: JST **Pins:** - 1 [pin 1] - 2 [pin 2] ### J3 — [B2P-VH(LF)(SN)](https://www.flux.ai/qgen-joshua/b2p-vhlfsn~ds.md) - Connector Type: Header - Connector Gender: Male - Connector Rows: 1 - Connector Pitch: 3.96mm - Part Type: Wire To Board / Wire To Wire Connector - LCSC Part Number: C160315 - JLCPCB Part Class: Extended Part - Connector Positions: 2 - Current Rating: 10A - Product Info Url: https://lcsc.com/product-detail/_JST_B2P-VH-LF-SN_B2P-VH-LF-SN_C160315.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B2P-VH-LF-SN_C160315.pdf - Manufacturer Name: JST - Manufacturer Part Number: B2P-VH(LF)(SN) - Package or Case Code: CONN-TH_B2P-VH-LF-SN - Voltage Rating: 250V - Operating Temperature: -25 ~ +85℃ **Pins:** - 1 [pin 1] - 2 [pin 2] ### J4 — [B2B-XH-A(LF)(SN)](https://www.flux.ai/qgen-joshua/b2b-xh-alfsn~dj.md) - Connector Type: Wire To Board / Wire To Wire Connector - Manufacturer Name: JST - Package or Case Code: CONN-TH_B2B-XH-A-LF-SN - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B2B-XH-A-LF-SN_C158012.pdf - Product Info Url: https://lcsc.com/product-detail/XH-Connectors_JST_B2B-XH-A-LF-SN_XHsocket-1-2P-pitch2-5mm_C158012.html - Pitch: 2.5mm - Rows: 1 - Positions: 2 - Gender: Male - Part Type: Wire To Board / Wire To Wire Connector - JLCPCB Part Class: Extended Part - LCSC Part Number: C158012 - Manufacturer Part Number: B2B-XH-A(LF)(SN) **Pins:** - 1 [pin 1] - 2 [pin 2] ### J5 — [B6B-XH-A(LF)(SN)](https://www.flux.ai/qgen-joshua/b6b-xh-alfsn~wd.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Part Number: B6B-XH-A(LF)(SN) - Manufacturer Name: JST Sales America Inc. - Datasheet URL: https://www.phoenixcontact.com/en-us/products/pcb-header-mstba-25-3-g-508-1757255?type=pdf **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### J6 — [B4B-XH-A(LF)(SN)](https://www.flux.ai/qgen-joshua/b4b-xh-alfsn~x7.md) - Manufacturer Name: JST - Manufacturer Part Number: B4B-XH-A(LF)(SN) - Connector Type: Wire-to-board Header - Product Info Url: https://lcsc.com/product-detail/_JST-Sales-America_B4B-XH-A-LF-SN_JST-Sales-America-B4B-XH-A-LF-SN_C144395.html - Gender: Male - Package or Case Code: CONN-TH_B4B-XH-A-LF-SN - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B4B-XH-A-LF-SN_C144395.pdf - Pitch: 2.5mm - Positions: 4 - LCSC Part Number: C144395 - Rows: 1 - JLCPCB Part Class: Extended Part - Part Type: Wire To Board / Wire To Wire Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J7 — [ICSP](https://www.flux.ai/qgen-joshua/icsp~37.md) - Manufacturer Part Number: PH2-06-UA - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/6f7415e6ddb6621d95d1e14560c9385cc233ca9f1a1b11b848c0271f634dbdb4.pdf - Part Type: Connector - Manufacturer Name: Adam Tech **Pins:** - +VCC [pin 2] - GND [pin 6] - MISO [pin 1] - MOSI [pin 4] - RST [pin 5] - SCK [pin 3] ### Q1 — [AO3400A](https://www.flux.ai/adrian95/ao3400a~ug9.md) - Max Current: 5.25A - License: https://creativecommons.org/licenses/by/4.0/ - Role: Switching - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Alpha%20&%20Omega/AO3400A_ds.pdf - Manufacturer Part Number: AO3400A - Current: 3.5A - Role Details: J2 switched return. Verify AO3400A RDS(on) and thermal dissipation at actual branch current and gate-driver VDD; use 3.5 A / 5.25 A margin if this branch carries full load. - Part Type: Transistor - LCSC Part Number: C20917 - Manufacturer Name: Alpha & Omega Semiconductor Inc. **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### Q2 — [AO3400A](https://www.flux.ai/adrian95/ao3400a~ug9.md) - Role Details: J3 switched return. MCU-driven gate likely sees 3.3 V; verify AO3400A RDS(on) and thermal dissipation at actual branch current. Use 3.5 A / 5.25 A margin if this branch carries full load. - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Alpha%20&%20Omega/AO3400A_ds.pdf - Manufacturer Part Number: AO3400A - Max Current: 5.25A - Part Type: Transistor - Manufacturer Name: Alpha & Omega Semiconductor Inc. - Role: Switching - LCSC Part Number: C20917 - Current: 3.5A - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### Q3 — [AO3400A](https://www.flux.ai/adrian95/ao3400a~ug9.md) - LCSC Part Number: C20917 - License: https://creativecommons.org/licenses/by/4.0/ - Role: Switching - Current: 3.5A - Manufacturer Part Number: AO3400A - Role Details: J4 switched return. Load identity/current still needs confirmation. If used as VIN load or inductive load, verify MOSFET thermal margin and add clamp/flyback as needed. - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Alpha%20&%20Omega/AO3400A_ds.pdf - Manufacturer Name: Alpha & Omega Semiconductor Inc. - Part Type: Transistor - Max Current: 5.25A **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### U1 — [ATMEGA328PB-AU](https://www.flux.ai/adrian95/atmega328pb-au~88i.md) - Part Type: Microcontroller - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ATMEGA328PB-AU - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/40001907A.pdf - Manufacturer Name: Microchip - Symbol Style: parametric-v1 **Pins:** - ~RESET~/PC6 [pin 29] - AREF [pin 20] - AVCC [pin 18] - GND [pin 21] - GND [pin 5] - PB0 [pin 12] - PB1 [pin 13] - PB2 [pin 14] - PB3 [pin 15] - PB4 [pin 16] - PB5 [pin 17] - PC0 [pin 23] - PC1 [pin 24] - PC2 [pin 25] - PC3 [pin 26] - PC4 [pin 27] - PC5 [pin 28] - PD0 [pin 30] - PD1 [pin 31] - PD2 [pin 32] - PD3 [pin 1] - PD4 [pin 2] - PD5 [pin 9] - PD6 [pin 10] - PD7 [pin 11] - PE0 [pin 3] - PE1 [pin 6] - PE2 [pin 19] - PE3 [pin 22] - VCC [pin 4] - XTAL1/PB6 [pin 7] - XTAL2/PB7 [pin 8] ### U2 — [TPS54360BDDA](https://www.flux.ai/lcsc/tps54360bdda~vpmk.md) - Manufacturer Part Number: TPS54360BDDA - Manufacturer Name: TI(德州仪器) - LCSC Part Number: C1355730 - JLCPCB Part Class: Extended Part - Part Type: DC-DC Converters - Package or Case Code: SO-8_L4.9-W3.9-P1.27-LS6.0-BL-EP **Pins:** - BOOT [pin 1] - COMP [pin 6] - EN [pin 3] - EP [pin 9] - FB [pin 5] - GND [pin 7] - RT/CLK [pin 4] - SW [pin 8] - VIN [pin 2] ### U3 — [AMS1117-3.3](https://www.flux.ai/jecstronic/ams1117-33~zxs.md) - Manufacturer Part Number: -3.3 - Manufacturer Name: Diodes Incorporated - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://datasheet.octopart.com/AP1117EG-13-Diodes-Inc.-datasheet-42900990.pdf **Pins:** - GND [pin 1] - VI [pin 3] - VO [pin 2] ### U4 — [TC4427AEOA](https://www.flux.ai/adrian95/tc4427aeoa~4m5.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/20001423J.pdf - Manufacturer Name: Microchip Technology - Manufacturer Part Number: TC4427AEOA - Part Type: Integrated Circuit **Pins:** - GND [pin 3] - IN_A [pin 2] - IN_B [pin 4] - NC_1 [pin 1] - NC_2 [pin 8] - OUT_A [pin 7] - OUT_B [pin 5] - VDD [pin 6] ### U5 — [TPS54360BDDA](https://www.flux.ai/lcsc/tps54360bdda~vpmk.md) - LCSC Part Number: C1355730 - Manufacturer Name: TI(德州仪器) - JLCPCB Part Class: Extended Part - Manufacturer Part Number: - Package or Case Code: SO-8_L4.9-W3.9-P1.27-LS6.0-BL-EP - Part Type: DC-DC Converters **Pins:** - BOOT [pin 1] - COMP [pin 6] - EN [pin 3] - EP [pin 9] - FB [pin 5] - GND [pin 7] - RT/CLK [pin 4] - SW [pin 8] - VIN [pin 2] ### Y1 — [X49SM8MSD2SC](https://www.flux.ai/swaegner/x49sm8msd2sc~6w.md) - Part Type: Oscillator - Frequency: 8MHz - Datasheet URL: https://datasheet.lcsc.com/lcsc/2304140030_Yangxing-Tech-X49SM8MSD2SC_C12674.pdf - Manufacturer Part Number: X49SM8MSD2SC **Pins:** - P1 [pin 1] - P2 [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/qgen-joshua/qgen-ozone-main-8731~td](https://www.flux.ai/qgen-joshua/qgen-ozone-main-8731~td).* --- *Generated from [https://www.flux.ai/qgen-joshua/qgen-ozone-main-8731~td](https://www.flux.ai/qgen-joshua/qgen-ozone-main-8731~td)*