SMBJ18CA 600W 18V Zener Transient Voltage Suppressor
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SMBJ18CA 600W 18V Zener Transient Voltage Suppressor | Bidirectional TVS Diode in Surface-Mount Package for Lightning and Transient Event Protection
The SMBJ18CA is a high-performance Zener Transient Voltage Suppressor (TVS) rated at 600W peak power dissipation for protecting sensitive electronic equipment from voltage transients caused by lightning strikes, ESD events, inductive load switching, and power-line surges. Drop-in protection device for the input rails of industrial equipment, telecom interfaces, automotive ECUs, and any sensitive electronics exposed to harsh electrical environments.
Bidirectional architecture ("CA" suffix = bidirectional channel) clamps voltage excursions in both polarities — important for AC-coupled lines or signal pairs where positive and negative transients are equally likely. Surface-mount package handles automated SMT line production. High temperature soldering tolerance survives standard reflow profiles without performance degradation. Fast response time clamps transient before they damage downstream components.
When to Use the SMBJ18CA
- Input rail protection on industrial equipment running off potentially noisy mains.
- Telecom interface protection — RS-485, RS-232, Ethernet PHY interfaces exposed to ESD.
- Automotive ECU input protection — 12V/24V rails subjected to load dump events.
- Signal line ESD protection — protecting MCU GPIOs from ESD events at the connector.
- Inductive load switching protection — clamping flyback voltage from motor / relay coils.
SMBJ18CA Specifications
| Parameter | Specification |
|---|---|
| Part Number | SMBJ18CA |
| Type | Zener Transient Voltage Suppressor (TVS) |
| Channel Configuration | Bidirectional (CA suffix) |
| Reverse Standoff Voltage (Vrwm) | 18V |
| Breakdown Voltage (Vbr min) | 20V |
| Clamping Voltage (max @ Ipp) | 29.2V |
| Peak Pulse Power | 600W |
| Mounting | Surface mount (SMB package) |
| Operating / Storage Junction Temperature | -65°C to +150°C |
| Response Time | Fast (sub-nanosecond typical for TVS family) |
| Strain Relief | Built-in |
| Condition | Brand New |
FAQ — SMBJ18CA TVS Suppressor
Q: SMBJ18CA vs SMBJ18A — what's the difference?
A: "CA" suffix = bidirectional (clamps both polarities). "A" suffix = unidirectional (clamps positive transients only). For DC rails with known polarity, the unidirectional A is sufficient. For AC-coupled signals or where transient polarity is unpredictable, use the bidirectional CA.
Q: How do I size the TVS for my circuit?
A: Vrwm (18V here) should be slightly above your normal operating voltage — typically 10-15% above. Vbr should be well below the rated voltage of components downstream. Vclamp at the peak fault current should be below the downstream component's absolute maximum rating. The 600W peak rating handles most lightning and load-dump scenarios.
Q: How fast does the TVS respond to a transient?
A: Sub-nanosecond response time — fast enough to clamp lightning and ESD events before damaging downstream components. The clamping voltage rises slightly with peak current (29.2V at Ipp), so size downstream components with margin above that value.
Q: Bulk pricing for production runs?
A: Yes — email contact@lys-sz.com with your quantity. Reel and tape quantities are stocked.
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Production OEMs stocking SMBJ18CA by the reel? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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