TPSMC43A Equivalent & Substitute Parts

Part Overview

The TPSMC43A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the DO-214AB (SMC) package. This component provides transient voltage protection with a 36.8V reverse standoff voltage and 59.3V clamping voltage at peak pulse current. The part is active in production, RoHS3 compliant, and qualified to AEC-Q101 automotive standards. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	36.8	V
Voltage - Breakdown (Min)	40.9	V
Voltage - Clamping (Max) @ Ipp	59.3	V
Current - Peak Pulse (10/1000µs)	25.6	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the TPSMC43A are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 36.8V
Voltage - Clamping (Max) @ Ipp: 59.3V
Voltage - Breakdown (Min): 40.9V
Current - Peak Pulse (10/1000µs): 25.6A minimum
Power - Peak Pulse: 1500W
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener
Unidirectional Channels: 1

Identified Substitutes:

1.5SMC43A (Taiwan Semiconductor Corporation) — Matches all critical electrical parameters with 26A peak pulse current, exceeding the 25.6A requirement. Identical voltage ratings and power dissipation. Surface mount DO-214AB package.
SMCJ1.5KE43A-TP (Micro Commercial Co) — Matches all critical electrical parameters with 25.6A peak pulse current. Identical voltage ratings and power dissipation. Surface mount DO-214AB package. Extended operating temperature range to 175°C.

Parameter Comparison

Parameter	TPSMC43A (Main)	1.5SMC43A	SMCJ1.5KE43A-TP
Manufacturer	Littelfuse Inc.	Taiwan Semiconductor Corporation	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	36.8V	36.8V	36.8V
Voltage - Breakdown (Min)	40.9V	40.9V	40.9V
Voltage - Clamping (Max) @ Ipp	59.3V	59.3V	59.3V
Current - Peak Pulse (10/1000µs)	25.6A	26A	25.6A
Power - Peak Pulse	1500W	1500W	1500W
Operating Temperature Range	-55 to 150°C	-55 to 150°C	-55 to 175°C
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener
Unidirectional Channels	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts are active in production and RoHS3 compliant. Selection between the TPSMC43A and its substitutes is determined by availability, packaging format, and application-specific temperature requirements.

TPSMC43A — Primary choice for automotive applications requiring AEC-Q101 qualification. Packaged in Cut Tape (CT) and Digi-Reel® formats.

1.5SMC43A — Suitable for general applications with identical electrical performance. Peak pulse current of 26A provides margin above the 25.6A specification. Supplied in Tape & Reel (TR) format.

SMCJ1.5KE43A-TP — Applicable for applications requiring extended operating temperature range to 175°C. Matches the TPSMC43A peak pulse current specification exactly. Supplied in Tape & Reel (TR) format.

Frequently Asked Questions (FAQ)

Q: Can 1.5SMC43A be used as a direct replacement for TPSMC43A?

A: Yes. The 1.5SMC43A matches all critical electrical parameters: 36.8V reverse standoff voltage, 59.3V clamping voltage, and 1500W peak pulse power. The 26A peak pulse current exceeds the TPSMC43A specification of 25.6A. Both are surface mount DO-214AB packages. Packaging format differs (Tape & Reel vs. Cut Tape/Digi-Reel).

Q: What is the difference between SMCJ1.5KE43A-TP and TPSMC43A?

A: Electrical specifications are identical: 36.8V reverse standoff, 59.3V clamping voltage, 25.6A peak pulse current, and 1500W power dissipation. The SMCJ1.5KE43A-TP operates to 175°C junction temperature, compared to 150°C for the TPSMC43A. Both use DO-214AB surface mount packages. Packaging format differs (Tape & Reel vs. Cut Tape/Digi-Reel).

Q: Are all substitutes RoHS3 compliant?

A: Yes. The TPSMC43A, 1.5SMC43A, and SMCJ1.5KE43A-TP are all RoHS3 compliant with MSL rating of 1 (Unlimited) and REACH Unaffected status.

Q: Do package dimensions differ between these parts?

A: All three parts use the DO-214AB (SMC) surface mount package. Physical dimensions are identical. Packaging format (tape reel configuration) may differ by supplier.

Q: Which substitute is best for high-temperature applications?

A: The SMCJ1.5KE43A-TP supports operating temperatures to 175°C junction temperature, compared to 150°C for the TPSMC43A and 1.5SMC43A. Selection depends on application thermal requirements.

Q: Are these parts suitable for automotive applications?

A: The TPSMC43A is qualified to AEC-Q101 automotive standards. The 1.5SMC43A and SMCJ1.5KE43A-TP are not specified with automotive qualification in the provided data. Automotive application requirements should be verified with the respective manufacturers.

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