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STMicroelectronics SM15T75A — Circuit Protection

SM15T75A TRANSIL TVS Diode, 1500W, 64.1V Standoff, DO-214AB

MPNSM15T75A
Obsolete

STMicroelectronics SM15T75A TRANSIL™ TVS, Zener type, 1500W peak pulse power, 64.1V reverse standoff voltage, 134V clamping, unidirectional, DO-214AB SMC surface mount package.

STMicroelectronics SM15T75A datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

SM15T75A specifications
ParameterValue
TypeZener
SeriesSM15T, TRANSIL™
MountingSurface Mount
Voltage - breakdown71.3V
Voltage - clamping (Max) @ ipp134V
Voltage - reverse standoff64.1V
Current - peak pulse (10/1000μs)75A (8/20µs)
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsGeneral Purpose
CaseDO-214AB, SMC
Unidirectional channels1

Product details

1500W transient suppressor for 64 V rails

The 134 V maximum clamping voltage defines the headroom a downstream device must survive. This part is specified for general-purpose transient protection and is mounted in a DO-214AB (SMC) surface-mount package.

Obsolete — sourcing the remaining stock

This means STMicroelectronics has ended production, and no further factory orders are possible. The available supply is limited to existing distributor and broker inventory. Buyers needing this exact order code for a BOM line or a repair should confirm date-code provenance and quantity availability against an RFQ — the window for genuine ST-marked parts narrows as inventory depletes.

What the 1500 W rating means for your rail

For a 64.1 V rail, the 75 A peak pulse current (8/20 µs) gives a real-world surge-handling figure: a transient that drives 75 A through the diode will be clamped to 134 V. If the downstream circuitry cannot tolerate 134 V even for microseconds, a lower-clamp-voltage TVS or additional filtering is needed. The 64.1 V reverse standoff means the diode draws negligible leakage at normal operating voltage — it only conducts when the rail exceeds that threshold.

The SMC body provides adequate copper area for heat sinking during the pulse — the PCB pad design should follow the recommended land pattern to keep the thermal impedance low.

Frequently asked questions

Is SM15T75A obsolete?

Yes, the SM15T75A is officially obsolete per STMicroelectronics. No further production is planned. Remaining inventory is limited to existing distributor and broker stock.

What is the replacement for SM15T75A?

For a pin-compatible alternative, consider the SM15T family's active voltage variants or a functionally equivalent TVS from another manufacturer with the same 64.1 V standoff and 1500 W rating in DO-214AB. Verify clamping voltage and pulse current ratings against your transient requirements.

What is the power rating of SM15T75A?

The SM15T75A is rated for 1500 W peak pulse power (1.5 kW) under an 8/20 µs waveform. This is the maximum energy it can absorb in a single transient event without damage.

SM15T75A vs P6KE75A: Which one to choose?

The P6KE75A is a 600 W axial-lead TVS (DO-15 package) with a 64.1 V standoff and 103 V clamp, versus the SM15T75A's 1500 W surface-mount SMC package with a 134 V clamp. The SM15T75A handles more than double the surge energy and suits reflow assembly; the P6KE75A is a lower-cost through-hole option for boards where wave solder is acceptable. Choose based on required pulse power, board assembly process, and clamp voltage tolerance.