# [Multi-layer] JLCPCB Constraints ## Description Use this template if you're planning to get your multi layer board manufactured in JLCPCB. It has the via min/max and trace width constraints already baked as global rules. #project-template #template #manufacturer-design-rules ## Project Details - **Owner:** denemem - **Created:** 3/19/2026 - **Last Updated:** 3/19/2026 - **Visibility:** Public - **System Architecture:** flowchart TD A[12-48V Input] --> B[Existing Protection and Filter] B --> C[48V Buck to 5V] C --> D[5V Rail] D --> E[3.3V LDO] E --> F[3V3 Rail] B --> G[VIN Test Point] D --> H[5V Test Point] E --> I[3V3 Test Point] B --> J[GND Test Point] - **India RoHS (Classic 6):** True - **Role:** Isolation - **BIS Registration (India):** True - **WPC ETA for Bluetooth:** True - **Part Type:** Home-use device classification - **Power Requirements:** Mains - **Domain:** Medical - **Role Details:** Medical-grade SELV adapter requirement for BF-classified, home-use BP monitor; external adapter must be BIS-registered and provide SELV-limited output for patient-connected circuitry. - **Compliance:** RoHS - **Board Thickness:** 1.6mm ## Key Components ### D1 — [BZT52C12-13-F](https://www.flux.ai/adrian95/bzt52c12-13-f.md) - Role Details: 12V gate-source clamp for reverse polarity protection MOSFET - Role: Clamp - Manufacturer Part Number: BZT52C12-13-F - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds18004.pdf - Manufacturer Name: Diodes Incorporated - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Diode - Package: SOD-123 **Pins:** - A [pin 2] - K [pin 1] ### D2 — [SMBJ58A-13-F](https://www.flux.ai/lcsc/smbj58a-13-f.md) - Product Info Url: https://lcsc.com/product-detail/TVS_DIODES_SMBJ58A-13-F_SMBJ58A-13-F_C135085.html - LCSC Part Number: C135085 - Part Type: TVS - Manufacturer Part Number: SMBJ58A-13-F - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-SMBJ58A-13-F_C135085.pdf - Manufacturer Name: DIODES(美台) - Role Details: Unidirectional TVS clamp on 12-48V DC input rail - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - Package: SMB_L4.6-W3.6-LS5.3-RD - Role: TVS Protection **Pins:** - A [pin 2] - K [pin 1] ### J1 — [2-Position Screw Terminal](https://www.flux.ai/corynrobinson/2-position-screw-terminal.md) - Manufacturer Name: Würth Elektrik - Role Details: 12-48V DC input connector, P1=VIN+, P2=VIN- / return - Part Type: Connector - Datasheet URL: https://www.we-online.com/katalog/datasheet/691137710002.pdf - Manufacturer Part Number: 691137710002 - Package: Screw Terminal - Role: Power Input **Pins:** - P1 [pin 1] - P2 [pin 2] ### U1 — [LM2596HVS-5.0](https://www.flux.ai/adrian95/lm2596hvs-5p0.md) - Part Type: Integrated Circuit - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/2577/UMW%20LM2596_HV.pdf - Package: TO-263-6 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: LM2596HVS-5.0 - Manufacturer Name: UMW - Role: Buck Regulator - Role Details: Converts protected HV input rail to regulated 5V **Pins:** - ~ON~/OFF [pin 5] - FEEDBACK [pin 4] - GND_TAB [pin 6] - GROUND [pin 3] - OUTPUT [pin 2] - VIN [pin 1] ### U2 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1.md) - Datasheet URL: Diodes Incorporated - Package: SOT-25 - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: AP2112K-3.3TRG1 - Manufacturer Name: https://www.diodes.com/assets/Datasheets/AP2112.pdf - Role: LDO Regulator - Role Details: Converts 5V rail to regulated 3.3V **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/denemem/multi-layer-jlcpcb-constraints](https://www.flux.ai/denemem/multi-layer-jlcpcb-constraints).* --- *Generated from [https://www.flux.ai/denemem/multi-layer-jlcpcb-constraints](https://www.flux.ai/denemem/multi-layer-jlcpcb-constraints)*