# 5V Hazardous-Live LNK3204D Offline Buck ## Description 230 VAC to 5 V non-isolated offline buck using Power Integrations LNK3204D. Every net, including HAZ_5V and HAZ_RETURN, is hazardous live/mains-referenced; sealed internal use only with galvanically isolated test and programming equipment. ## Project Details - **Owner:** ess461 - **Created:** 8/5/2026 - **Last Updated:** 8/5/2026 - **Visibility:** Public - **Domain:** Power Supply - **Power Requirements:** 0.6W non-isolated - **Compliance:** Safety review required - **Implementation Details:** All circuitry including 5 V rail and return is HAZARDOUS LIVE; sealed internal smart-plug use only; isolated programming and galvanically isolated instrumentation mandatory. - **Operating Voltage:** 230V ## Key Components ### D1 — [1N4007RLG](https://www.flux.ai/jecstronic/1n4007rlg~07j.md) - Functional Group: Hazardous Live Rectifier and EMI Filter - Role: Rectification - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Diode - Datasheet URL: https://www.onsemi.com/pdf/datasheet/1n4001-d.pdf - Manufacturer Name: onsemi - Manufacturer Part Number: 1N4007RLG - Role Details: HAZARDOUS LIVE 1000 V/1 A line rectifier; anode from fused line, cathode to positive HV bus **Pins:** - anode [pin 2] - cathode [pin 1] ### D2 — [1N4007RLG](https://www.flux.ai/jecstronic/1n4007rlg~07j.md) - Role Details: HAZARDOUS LIVE 1000 V/1 A return diode; anode to HAZ_RETURN, cathode to HAZ_N - Manufacturer Part Number: 1N4007RLG - Manufacturer Name: onsemi - Datasheet URL: https://www.onsemi.com/pdf/datasheet/1n4001-d.pdf - Functional Group: Hazardous Live Rectifier and EMI Filter - Role: Rectification - Part Type: Diode - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - anode [pin 2] - cathode [pin 1] ### D3 — [UF4007](https://www.flux.ai/lcsc/uf4007~dqda.md) - Role: Catch Diode - Manufacturer Name: MDD(辰达半导体) - Package or Case Code: DO-41_BD2.4-L4.7-P8.70-D0.9-RD - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2407291942_MDD-Microdiode-Semiconductor-UF4007_C960666.pdf - LCSC Part Number: C960666 - Role Details: HAZARDOUS LIVE UF4007 1000 V/1 A, tRR <=75 ns; anode HAZ_RETURN, cathode HAZ_SW; MDCM only - Product Info Url: https://lcsc.com/product-detail/Diodes-Rectifiers-Fast-Recovery_MDD-Microdiode-Electronics-UF4007_C960666.html - JLCPCB Part Class: Extended Part - Functional Group: Hazardous Live Offline Buck - Manufacturer Part Number: UF4007 - Part Type: Diodes - Fast Recovery Rectifiers **Pins:** - A [pin 2] - K [pin 1] ### D4 — [1N4007RLG](https://www.flux.ai/jecstronic/1n4007rlg~07j.md) - Part Type: Diode - Functional Group: Hazardous Live Offline Buck - Role: Feedback Rectifier - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: HAZARDOUS LIVE feedback rectifier; anode HAZ_5V, cathode HAZ_SENSE - Manufacturer Name: onsemi - Datasheet URL: https://www.onsemi.com/pdf/datasheet/1n4001-d.pdf - Manufacturer Part Number: 1N4007RLG **Pins:** - anode [pin 2] - cathode [pin 1] ### F1 — [2010T200mA250V](https://www.flux.ai/lcsc/2010t200ma250v~pyp4.md) - Package or Case Code: FUSE-TH_L8.5-W4.0-P5.08-D0.6 - Manufacturer Part Number: 2010T200mA250V - LCSC Part Number: C2840857 - Manufacturer Name: WALTER(华德) - Voltage Rating: 250V - JLCPCB Part Class: Extended Part - Role: Protection - Functional Group: Mains Protection - Current Rating: 0.2A - Role Details: HAZARDOUS LIVE 200 mA time-delay fuse in series with HAZ_L; breaking-capacity coordination remains product-level requirement - Part Type: Disposable fuses **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [XY301V-A-5.0-2P](https://www.flux.ai/jharwinbarrozo/xy301v-a-50-2p~u6.md) - Role: Power Conversion - Part Type: Connector - Manufacturer Name: Ningbo Xinlaiya Elec. - Connector Positions: 2 - Voltage Rating: 300V - Current Rating: 15A - Manufacturer Part Number: XY301V-A-5.0-2P - Datasheet URL: https://www.lcsc.com/datasheet/C557651.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=E1BYV1AHFgUMXgFVQ1AMU1JVQFReXgIATwJfA10DFVkxVlNRT1dXXlVTQ1hbUjsOAxUeFF5JWBYZEEoBGA4JCwFIFA4DSA%3D%3D - Role Details: HAZARDOUS LIVE mains input terminal; pin 1 HAZ_L, pin 2 HAZ_N; sealed enclosure only - Connector Type: Screw terminal - Functional Group: Mains Input **Pins:** - PIN1 [pin 1] - PIN2 [pin 2] ### MOV1 — [V14E275P](https://www.flux.ai/lcsc/v14e275p~yv2u.md) - Product Info Url: https://lcsc.com/product-detail/Varistors_Littelfuse_V14E275P_Littelfuse-V14E275P_C179017.html - Manufacturer Part Number: V14E275P - Functional Group: Mains Protection - Part Type: Varistors - Manufacturer Name: Littelfuse(美国力特) - Voltage Rating: 275V - JLCPCB Part Class: Extended Part - Package or Case Code: RES-TH_L14.0-W4.9-P7.50-D0.8-S4.90 - Datasheet URL: https://www.littelfuse.com/assetdocs/littelfuse_ultramov_varistor_series_datasheet.pdf - Role: Clamping - LCSC Part Number: C179017 - Role Details: HAZARDOUS LIVE V14E275P 275 VAC MOV across HAZ_L_FUSED and HAZ_N, downstream of F1 **Pins:** - 1 [pin 1] - 2 [pin 2] ### U1 — [LNK3204D-TL](https://www.flux.ai/lcsc/lnk3204d-tl~7zfd.md) - Manufacturer Name: Power Integrations(帕沃英蒂格盛) - Manufacturer Part Number: LNK3204D-TL - JLCPCB Part Class: Extended Part - Package or Case Code: SO-8C_7P-L4.9-W3.9-P1.27-LS6.0-BL-PE3 - Role Details: HAZARDOUS LIVE LNK3204D standard buck; conservative 5 V/120 mA MDCM target; entire output mains-referenced - LCSC Part Number: C567600 - Role: Power Conversion - Part Type: DC-DC Converters - Functional Group: Hazardous Live Offline Buck **Pins:** - BP/M [pin 1] - D [pin 4] - FB [pin 2] - S [pin 7] - S [pin 5] - S [pin 6] - S [pin 8] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/ess461/5v-hazardous-live-lnk3204d-offline-buck~ar](https://www.flux.ai/ess461/5v-hazardous-live-lnk3204d-offline-buck~ar).* --- *Generated from [https://www.flux.ai/ess461/5v-hazardous-live-lnk3204d-offline-buck~ar](https://www.flux.ai/ess461/5v-hazardous-live-lnk3204d-offline-buck~ar)*