SMBJ15CA TVS Diode 15V 600W (BM) – Control Board Protection for Antminer / Whatsminer / Avalon
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SMBJ15CA Bidirectional TVS Diode | 15V / 600W Surge Protection for Antminer, Whatsminer & Avalon Control Boards
The SMBJ15CA (silk marking BM) is a bidirectional TVS (Transient Voltage Suppression) diode used across ASIC miner control boards from Antminer, Whatsminer, Innosilicon, and Avalon to clamp transient voltage spikes before they reach sensitive logic. Bidirectional construction protects against transients of either polarity, which matters on signal lines that swing in both directions.
Headline numbers for control-board protection: 15V working voltage, 600W peak pulse power (10/1000µs), up to 4kW surge capability (8/20µs), 0.2µA leakage at 25°C (negligible standby draw), and up to 150°C junction temperature tolerance. The DO-214AA (SMB) package is the standard mid-power TVS outline — wide compatibility across boards that route TVS protection on critical signal lines.
When to Replace the SMBJ15CA
- Control board logic damage after a lightning event — TVS absorbed the strike, sacrificed itself, replace before the next strike kills downstream logic.
- Visible damage on the DO-214AA package — cracking or burning after a surge event.
- Signal line stuck at rail — TVS shorted, clamping the line.
- Climbing leakage current measured on the protected line — TVS degraded after repeated transient events.
- Control board boots intermittently after power events — TVS no longer absorbing transients cleanly.
SMBJ15CA TVS Diode Specifications
| Parameter | Specification |
|---|---|
| Part Number | SMBJ15CA |
| Silk Marking | BM |
| Type | TVS diode (bidirectional) |
| Working Voltage | 15V |
| Peak Pulse Power | 600W (10/1000 µs) |
| Surge Capability | Up to 4 kW (8/20 µs) |
| Leakage Current | 0.2 µA at 25°C |
| Junction Temperature (max) | 150°C |
| Package | SMB (DO-214AA) |
| Mounting Type | Surface mount |
| Compatible Boards | Antminer / Whatsminer / Innosilicon / Avalon control boards, SMPS |
| Condition | Brand New |
FAQ — SMBJ15CA TVS Diode
Q: Bidirectional vs unidirectional TVS — which one is the SMBJ15CA?
A: The CA suffix on the part number indicates bidirectional construction (clamps positive and negative transients). The plain SMBJ15A (without C) is unidirectional. Match the original part exactly when replacing — substituting unidirectional on a bidirectional pad will leave one polarity unprotected.
Q: How do I confirm the TVS is the dead part?
A: Power off. DMM diode-test mode across the TVS. Healthy bidirectional TVS reads ~0.7V in both directions (positive and negative). Shorted reads 0Ω both directions. Open reads OL both directions. Any short on the line being protected = replace TVS and inspect downstream logic for damage.
Q: Will a higher voltage TVS work as a substitute?
A: Risky. A higher-voltage TVS (e.g. SMBJ20CA) will clamp at a higher voltage and may let through transients that the original 15V part would have absorbed. Substitute only with the same working voltage rating.
Q: Bulk pricing for control board repair?
A: Yes — email contact@lys-sz.com for reel-quantity SMBJ15CA pricing.
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Control board repair benches stocking SMBJ15CA TVS diodes by the reel? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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