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Taiwan Semiconductor Corporation 1.5SMC27A R7G — Circuit Protection

1.5SMC27A R7G TVS Diode, 1500W, 23.1V Standoff, DO-214AB

MPN1.5SMC27A R7G
Active

Taiwan Semiconductor 1.5SMC series Zener TVS diode, 1.5SMC27A R7G, 1500W peak pulse power, 23.1V standoff, 37.5V clamp, DO-214AB SMC package, Tape & Reel.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

1.5SMC27A R7G specifications
ParameterValue
TypeZener
Series1.5SMC
MountingSurface Mount
Voltage - breakdown25.7V
Voltage - clamping (Max) @ ipp37.5V
Voltage - reverse standoff23.1V
Current - peak pulse (10/1000μs)42A
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR)
ApplicationsGeneral Purpose
CaseDO-214AB, SMC
Unidirectional channels1

Product details

Surge clamp for 24V rails

The 1.5SMC27A R7G: With a 23.1V reverse standoff voltage, it sits across a nominal 24V bus and remains transparent until a surge pushes the line above 25.7V breakdown.

The 1500W peak pulse power rating (1.5kW) is tested with a 10/1000µs exponential waveform — the standard for industrial surge testing per IEC 61000-4-5. For shorter pulses (8/20µs) the part can handle significantly higher peak current, but the 42A figure at 37.5V clamp is the safe limit for the 10/1000µs condition.

Frequently asked questions

Is 1.5SMC27A R7G a Zener diode or a TVS?

It is a Zener-type TVS diode — a transient voltage suppressor that uses Zener breakdown to clamp surges. The 'Zener' type classification reflects the avalanche mechanism, but the part is designed for surge protection, not voltage regulation.

What is the closest pin-compatible alternative to 1.5SMC27A R7G?

Within the same 1.5SMC series, the bidirectional variant 1.5SMC27CA R7G shares the same DO-214AB package, standoff voltage (23.1V), and peak pulse power (1500W), but uses two back-to-back Zener junctions for symmetrical clamping. For unidirectional protection, the 1.5SMC27A is the standard choice; the 'CA' suffix is the bidirectional counterpart.