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KYOCERA AVX SMBJ18A — Circuit Protection

SMBJ18A TVS Diode – 18V Standoff, 600W, DO-214AA

MPNSMBJ18A
Active

KYOCERA AVX SMBJ18A, Zener TVS diode, 18V reverse standoff, 600W peak pulse power, unidirectional, DO-214AA SMB package, surface mount.

$0.4700Ref. price · indicative, final on quote
KYOCERA AVX SMBJ18A datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SMBJ18A specifications
ParameterValue
TypeZener
MountingSurface Mount
Voltage - breakdown20V
Voltage - clamping (Max) @ ipp29.2V
Voltage - reverse standoff18V
Current - peak pulse (10/1000μs)20.55A
Power - peak pulse600W
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsGeneral Purpose
CaseDO-214AA, SMB
Unidirectional channels1

Product details

Transient suppression for 18V rails

Its 20V minimum breakdown voltage and 29.2V maximum clamping at 20.55A peak pulse current define the protection window for general-purpose circuits. The 18V standoff voltage means it sits across a 15V or 18V rail without conducting in normal operation—only clamps when the transient exceeds the breakdown threshold.

Thermal and mounting considerations

The DO-214AA (SMB) package is a surface-mount footprint with a copper tab on the cathode side—the PCB pad area under that tab directly sets the junction-to-ambient thermal resistance, so a generous copper pour is recommended for sustained pulse trains. No power line protection means this device is intended for signal or low-energy DC rail clamping, not AC mains or high-energy surge paths. The single unidirectional channel protects one rail per device; for bidirectional or multiple-rail protection, a pair or a different TVS series is needed.

For BOM planning, the active lifecycle means no last-time-buy urgency.

Frequently asked questions

Is SMBJ18A RoHS compliant?

The evidence does not list a RoHS compliance statement. For a definitive compliance declaration, refer to the manufacturer's datasheet or certification document.

What is the closest pin-compatible alternative to SMBJ18A?

The evidence does not list a specific cross-reference or second-source part. Any alternative would need to match the DO-214AA package, 18V standoff, and 600W peak pulse power—confirm the clamping voltage and breakdown tolerance before substitution.