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BSD5C121U

Public Made by Adom

by adom

BORN ESD And Surge Protection (TVS/ESD), SOD-523. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

markdown

BSD5C121U

BORN · ESD And Surge Protection (TVS/ESD) · SOD-523

BSD5C121U from BORN, in a SOD-523. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 1 passive Bidirectional ESD protection terminal (12V reverse stand-off, 0.3pF typ. capacitance) connected to the protected data/power line; polarity is interchangeable with pin 2.
2 2 passive Bidirectional ESD protection terminal (12V reverse stand-off, 0.3pF typ. capacitance) connected to the protected line or ground return; polarity is interchangeable with pin 1.

Key specifications

Parameter Value
Manufacturer BORN
Package SOD-523
Category Circuit Protection
Pins 2

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Reverse Breakdown Voltage VBR 13.2 14.7 V IT=1mA 2
Reverse Leakage Current IR 0.1 0.5 μA VRWM=12V,T=25℃ 2
Clamping Voltage VC 35 V IPP=3.5A,tp=8/20μs 2
Junction Capacitance Cj 0.3 0.5 pF VR = 0V, f = 1MHz 2
Reverse Stand-Off Voltage VRWM 12 V 2
Peak Pulse Current IPP 3.5 A tp =8/20μs 2
Peak Pulse Power PPP 100 Watts tp =8/20μs 2
Peak Pulse Current Ipp 3.5 A tp =8/20μs 2
ESD per IEC 61000-4-2 (Air) VESD 20 kV IEC 61000-4-2 Air 2
ESD per IEC 61000-4-2 (Contact) VESD 15 kV IEC 61000-4-2 Contact 2
Lead Soldering Temperature TL 260 ℃ 10 seconds 2
Junction Temperature TJ -55 125 ℃ 2
Storage Temperature Tstg -55 125 ℃ 2

CAD (KiCad official)

  • Symbol: BSD5C121U
  • Footprint: Diode_SMD:D_SOD-523
  • 3D model: SOD-523 (KiCad packages3D, STEP)
  • 3D model files: bsd5c121u-etched.step / bsd5c121u-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bsd5c121u.step / bsd5c121u.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: BORN datasheet (4 pp, sha256 f2542395baf255fa, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF