component
SMBJ40A-TR
Public Made by Adomby adom
STMicroelectronics ESD And Surge Protection (TVS/ESD), SMB(DO-214AA). Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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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README
markdownSMBJ40A-TR
STMicroelectronics · ESD And Surge Protection (TVS/ESD) · SMB(DO-214AA)
SMBJ40A-TR from STMicroelectronics, in a SMB(DO-214AA). 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SMB(DO-214AA) |
| 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 leakage current at 25 °C (SMBJ40A, unidirectional) | IRM | 0.2 | µA | at VRM (stand-off 40 V), 25 °C column | 3 | ||
| Reverse leakage current at 85 °C (SMBJ40A, unidirectional) | IRM | 1 | µA | at VRM (stand-off 40 V), 85 °C column | 3 | ||
| Breakdown voltage (SMBJ40A) | VBR | 44.4 | 46.7 | V | at IR = 1 mA | 3 | |
| Clamping voltage, 10/1000 µs surge (SMBJ40A) | VCL | 64.5 | V | 10/1000 µs surge | 3 | ||
| Peak pulse current, 10/1000 µs (SMBJ40A) | IPP | 9.7 | A | 10/1000 µs surge | 3 | ||
| Dynamic resistance, 10/1000 µs (SMBJ40A) | RD | 1.59 | Ω | 10/1000 µs surge | 3 | ||
| Clamping voltage, 8/20 µs surge (SMBJ40A) | VCL | 84 | V | 8/20 µs surge | 3 | ||
| Peak pulse current, 8/20 µs (SMBJ40A) | IPP | 48 | A | 8/20 µs surge | 3 | ||
| Dynamic resistance, 8/20 µs (SMBJ40A) | RD | 0.728 | Ω | 8/20 µs surge | 3 | ||
| Breakdown voltage temperature coefficient (SMBJ40A) | αT | 10.1 | 10^-4/°C | 3 | |||
| Peak pulse power dissipation | PPP | 600 | W | Tj initial = Tamb (10/1000 µs) | 2 | ||
| Operating junction temperature range | Tj | -55 | 150 | °C | 2 | ||
| Storage temperature range | Tstg | -65 | 150 | °C | 2 | ||
| Maximum lead temperature for soldering | TL | 260 | °C | during 10 s | 2 | ||
| Thermal resistance junction to leads | Rth(j-l) | 20 | °C/W | 2 | |||
| Thermal resistance junction to ambient | Rth(j-a) | 100 | °C/W | on printed circuit, recommended pad layout | 2 |
CAD (KiCad official)
- Symbol:
SMBJ40A-TR - Footprint:
Diode_SMD:D_SMB - 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
- 3D model files:
smbj40a-tr-etched.step/smbj40a-tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smbj40a-tr.step/smbj40a-tr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (11 pp, sha256
6d6fe330cf55be51, retrieved 2026-10-15, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).