component
SMBJ51AQ
Public Made by Adomby adom
Yangzhou Yangjie Elec Tech ESD And Surge Protection (TVS/ESD), DO-214AA(SMB). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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
markdownSMBJ51AQ
Yangzhou Yangjie Elec Tech · ESD And Surge Protection (TVS/ESD) · DO-214AA(SMB)
SMBJ51AQ from Yangzhou Yangjie Elec Tech, in a DO-214AA(SMB). 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 | K | passive | Cathode, marked by the band on the uni-directional SMBJ51AQ, which has 51 V working peak reverse voltage, 56.7 to 62.7 V breakdown at 1 mA and 82.4 V maximum clamping at 7.3 A. |
| 2 | A | passive | Anode, the unmarked end of the uni-directional SMBJ51AQ, which conducts forward with VF of 3.5 V maximum at 50 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | DO-214AA(SMB) |
| 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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VBR | 56.7 | 62.7 | V | @ IT = 1 mA | 2 | |
| Maximum Reverse Leakage | IR | 1 | μA | @ VRWM | 2 | ||
| Working Peak Reverse Voltage | VRWM | 51 | V | 2 | |||
| Maximum Reverse Surge Current | IPP | 7.3 | A | Surge current waveform per Fig.3 and derated per Fig.2 | 2 | ||
| Maximum Clamping Voltage | Vc | 82.4 | V | @ IPP | 2 | ||
| Maximum instantaneous forward voltage | VF | 3.5 | V | at 50A for unidirectional only | 1 | ||
| Peak pulse power dissipation | PPPM | 600 | W | 10/1000us waveform | 1 | ||
| Power dissipation | PD | 5 | W | on infinite heat sink at TL=75℃ | 1 | ||
| Peak forward surge current | IFSM | 100 | A | 8.3 ms single half sine-wave unidirectional only | 1 | ||
| Operating junction temperature | TJ | -55 | 175 | ℃ | 1 | ||
| Storage temperature range | TSTG | -55 | 175 | ℃ | 1 | ||
| Thermal resistance junction to lead | RθJL | 20 | ℃/W | junction to lead | 3 | ||
| Thermal resistance junction to ambient | RθJA | 100 | ℃/W | junction to ambient | 3 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | black | 4. Body color: Black | 3 | |
| contacts | tin | ● Terminals: Matte tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |
CAD (KiCad official)
- Symbol:
SMBJ51AQ - Footprint:
Diode_SMD:D_SMB - 3D model: DO-214AA(SMB) (KiCad packages3D, STEP)
- 3D model files:
smbj51aq-etched.step/smbj51aq-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smbj51aq.step/smbj51aq.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Yangzhou Yangjie Elec Tech datasheet (6 pp, sha256
c858e6d6adc08fc3, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).