SMCJ40A
Public Made by Adomby adom
hongjiacheng ESD And Surge Protection (TVS/ESD), SMC(DO-214AB). 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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README
markdownSMCJ40A
hongjiacheng · ESD And Surge Protection (TVS/ESD) · SMC(DO-214AB)
SMCJ40A from hongjiacheng, in a SMC(DO-214AB). 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 | hongjiacheng |
| Package | SMC(DO-214AB) |
| 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 (unidirectional SMCJ40A, 5% tolerance) | VBR | 44.4 | 49.1 | V | @IT = 1 mA (test current) | 3 | |
| Maximum clamping voltage | VC | 64.5 | V | @IPP = 23.3 A | 3 | ||
| Reverse leakage current | IR | 1 | μA | @VRWM = 40 V | 3 | ||
| Reverse stand-off voltage | VRWM | 40 | V | Unidirectional SMCJ40A (bidirectional SMCJ40CA not covered) | 3 | ||
| Maximum instantaneous forward voltage | VF | 3.5 | V | at 25A, unidirectional only (Note 4: VF<3.5V for VBR<200V) | 1 | ||
| Peak pulse power dissipation | PPPM | 1500 | W | 10/1000µs waveform (Fig.1) (Note 1), (Note 2) | 1 | ||
| Power dissipation on infinite heat sink | PM(AV) | 6.5 | W | TL=75℃ | 1 | ||
| Peak forward surge current | IFSM | 200 | A | 8.3ms single half sine wave (Note 3) | 1 | ||
| Operating junction and storage temperature range | TJ, TSTG | -55 | 150 | ℃ | 1 | ||
| Typical thermal resistance junction to lead | RθJ-L | 15 | ℃/W | junction to lead, typical | 1 | ||
| Typical thermal resistance junction to ambient | RθJ-A | 75 | ℃/W | junction to ambient, typical; mounted on 5.0mm x 5.0mm copper pads to each terminal (Note 2) | 1 | ||
| Typical maximum temperature coefficient of VBR | ΔVBR | 0.1 | % | ΔVBR = 0.1% × VBR@25℃ × ΔT (typical maximum, as printed) | 1 |
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 |
|---|---|---|---|---|
| contacts | tin | •Matte tin lead-free Plated •Halogen free and RoHS compliant | 1 |
CAD (KiCad official)
- Symbol:
SMCJ40A - Footprint:
Diode_SMD:D_SMC - 3D model: SMC(DO-214AB) (KiCad packages3D, STEP)
- 3D model files:
smcj40a-etched.step/smcj40a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smcj40a.step/smcj40a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: hongjiacheng datasheet (5 pp, sha256
5cbe7c34174b4905, retrieved 2026-10-21, 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).