TPSMC30A Equivalent & Substitute Parts

Part Overview

The TPSMC30A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in the DO-214AB (SMC) surface mount package. This component is designed for transient voltage protection applications with a reverse standoff voltage of 25.6V and peak pulse power rating of 1500W. The part is active in production, RoHS3 compliant, and carries AEC-Q101 automotive qualification.

Equivalent and substitute parts are identified based on matching electrical performance parameters and package compatibility. Selection of alternative components requires verification of voltage clamping characteristics, peak pulse current ratings, and operating temperature ranges to ensure functional equivalence in the target application.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	25.6	V
Voltage - Breakdown (Min)	28.5	V
Voltage - Clamping (Max) @ Ipp	41.4	V
Current - Peak Pulse (10/1000µs)	36.7	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the TPSMC30A are grouped based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 25.6V
Voltage - Breakdown (Min): 28.5V
Voltage - Clamping (Max) @ Ipp: 41.4V or 41.5V (within tolerance)
Power - Peak Pulse: 1500W (1.5kW)
Package / Case: DO-214AB, SMC
Type: Zener, Unidirectional
RoHS Status: ROHS3 Compliant
Mounting Type: Surface Mount

Secondary Considerations:

Current - Peak Pulse (10/1000µs): 36A to 38A range acceptable
Operating Temperature Range: Minimum -55°C, maximum 150°C or higher
Product Status: Active

Parts meeting these criteria are functionally equivalent for transient voltage suppression applications with identical voltage protection thresholds and package footprints.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ) [V]	Voltage - Breakdown (Min) [V]	Voltage - Clamping (Max) @ Ipp [V]	Current - Peak Pulse (10/1000µs) [A]	Power - Peak Pulse [W]	Operating Temperature [°C]	Package
TPSMC30A	Littelfuse Inc.	25.6	28.5	41.4	36.7	1500	-55 to 150	DO-214AB (SMCJ)
1.5SMC30A	Taiwan Semiconductor Corporation	25.6	28.5	41.4	38	1500	-55 to 150	DO-214AB (SMC)
SMCJ1.5KE30A-TP	Micro Commercial Co	25.6	28.5	41.4	36.7	1500	-55 to 175	DO-214AB (SMC)
1.5SMC30A-E3/57T	Vishay General Semiconductor - Diodes Division	25.6	28.5	41.4	36.2	1500	-65 to 150	DO-214AB (SMCJ)
SM15T30A	STMicroelectronics	25.6	28.5	54.6	187 (8/20µs)	1500	-55 to 150	DO-214AB (SMC)
SM15T30A-E3/57T	Vishay General Semiconductor - Diodes Division	25.6	28.5	41.5	36	1500	-65 to 150	DO-214AB (SMCJ)
SM15T30A-E3/9AT	Vishay General Semiconductor - Diodes Division	25.6	28.5	41.5	36	1500	-65 to 150	DO-214AB (SMCJ)
SM15T30AY	STMicroelectronics	25.6	28.5	54.6	187 (8/20µs)	1500	-40 to 150	DO-214AB (SMC)

Engineering Selection Recommendations

Direct Equivalents (Voltage Clamping 41.4V - 41.5V):

The following parts provide direct electrical equivalence to the TPSMC30A with clamping voltages within 41.4V to 41.5V range:

1.5SMC30A (Taiwan Semiconductor Corporation): Matches all critical parameters with 38A peak pulse current. Active product status, RoHS3 compliant.
SMCJ1.5KE30A-TP (Micro Commercial Co): Identical clamping voltage and peak pulse current. Extended operating temperature to 175°C. Active product status, RoHS3 compliant.
1.5SMC30A-E3/57T (Vishay General Semiconductor): Clamping voltage 41.4V with 36.2A peak pulse current. Extended lower temperature limit to -65°C. Active product status, RoHS3 compliant.
SM15T30A-E3/57T (Vishay General Semiconductor): Clamping voltage 41.5V with 36A peak pulse current. Extended lower temperature limit to -65°C. Active product status, RoHS3 compliant.
SM15T30A-E3/9AT (Vishay General Semiconductor): Clamping voltage 41.5V with 36A peak pulse current. Extended lower temperature limit to -65°C. Active product status, RoHS3 compliant.

Alternative Equivalents (Voltage Clamping 54.6V):

The following parts share identical reverse standoff and breakdown voltages but feature higher clamping voltages and significantly higher peak pulse currents:

SM15T30A (STMicroelectronics): Clamping voltage 54.6V with 187A peak pulse current (8/20µs). Active product status, RoHS3 compliant.
SM15T30AY (STMicroelectronics): Clamping voltage 54.6V with 187A peak pulse current (8/20µs). Automotive grade with AEC-Q101 qualification. Operating temperature -40°C to 150°C. Active product status, RoHS3 compliant.

All listed substitute parts maintain RoHS3 compliance, active product status, and surface mount DO-214AB (SMC/SMCJ) packaging. Selection between direct equivalents and alternative equivalents depends on application-specific requirements for clamping voltage and peak pulse current handling.

Frequently Asked Questions (FAQ)

Q: Can I use SM15T30A or SM15T30AY as a direct replacement for TPSMC30A?

A: SM15T30A and SM15T30AY feature higher clamping voltages (54.6V versus 41.4V) and significantly higher peak pulse currents (187A versus 36.7A). These parts are not direct replacements. Use only if your application requires higher clamping voltage and peak pulse current capability.

Q: What is the difference between DO-214AB (SMCJ) and DO-214AB (SMC) packaging?

A: Both designations refer to the same DO-214AB surface mount package footprint. The SMCJ and SMC suffixes indicate manufacturer-specific package designations but are mechanically and electrically compatible for PCB assembly.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance status, matching the TPSMC30A compliance requirement.

Q: Which substitute part has the widest operating temperature range?

A: SMCJ1.5KE30A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, compared to 150°C for the TPSMC30A. Parts from Vishay (1.5SMC30A-E3/57T, SM15T30A-E3/57T, SM15T30A-E3/9AT) extend the lower operating temperature to -65°C.

Q: Is SM15T30AY suitable for automotive applications?

A: Yes. SM15T30AY carries automotive grade designation with AEC-Q101 qualification, matching the TPSMC30A automotive qualification status.

Q: What is the difference between 10/1000µs and 8/20µs pulse specifications?

A: These represent different test pulse waveforms. The 10/1000µs waveform is standard for TVS diode specifications. The 8/20µs waveform is an alternative pulse shape. Peak pulse current values are specific to their respective waveforms and are not directly comparable between specifications.

Q: Can I substitute based on peak pulse power rating alone?

A: No. All listed parts share the same 1500W peak pulse power rating, but clamping voltage and peak pulse current vary significantly. Substitution requires matching voltage parameters (reverse standoff, breakdown, and clamping voltages) to ensure proper transient suppression in your circuit.

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