TPSMB75A Equivalent & Substitute Parts

Part Overview

The TPSMB75A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the DO-214AA (SMB) package. This component operates with a reverse standoff voltage of 64.1V and provides clamping protection at 103V with a peak pulse current rating of 5.9A. The part is actively produced, AEC-Q101 qualified for automotive applications, and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters that maintain functional equivalence in circuit protection applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	64.1	V
Voltage - Breakdown (Min)	71.3	V
Voltage - Clamping (Max) @ Ipp	103	V
Current - Peak Pulse (10/1000µs)	5.9	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65°C to 175°C	TJ
Package / Case	DO-214AA, SMB	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the TPSMB75A are identified based on the following critical parameters:

Voltage - Reverse Standoff (Typ): 64.1V
Voltage - Clamping (Max) @ Ipp: 103V
Current - Peak Pulse (10/1000µs): 5.9A (±tolerance)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB (surface mount)
Type: Zener, Unidirectional (1 channel)

Parts meeting these electrical and mechanical specifications are functionally equivalent for circuit protection applications. The P6SMB75A_R1_00001 from Panjit International Inc. and SM6T75AY from STMicroelectronics satisfy these criteria. The P6SMB75A from Eaton Electronics Division does not meet the voltage specifications and is not a valid substitute.

Parameter Comparison

Parameter	TPSMB75A (Littelfuse)	P6SMB75A_R1_00001 (Panjit)	SM6T75AY (STMicroelectronics)
Voltage - Reverse Standoff (Typ)	64.1V	64.1V	64.1V
Voltage - Breakdown (Min)	71.3V	71.3V	71.3V
Voltage - Clamping (Max) @ Ipp	103V	103V	134V
Current - Peak Pulse (10/1000µs)	5.9A	5.8A	30A (8/20µs)
Power - Peak Pulse	600W	600W	600W
Operating Temperature Range	-65°C to 175°C	-55°C to 150°C	-55°C to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Type	Zener	Zener	Zener
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q101 Qualification	Yes	No	Yes
Product Status	Active	Active	Active

Engineering Selection Recommendations

The P6SMB75A_R1_00001 from Panjit International Inc. is the primary equivalent substitute for the TPSMB75A. Both parts share identical voltage specifications (64.1V standoff, 103V clamping), equivalent peak pulse current ratings (5.9A vs. 5.8A), and matching power dissipation (600W). Both are RoHS3 compliant and actively produced. The operating temperature range of the Panjit part (-55°C to 150°C) is narrower than the Littelfuse part (-65°C to 175°C), which may be a consideration in extreme temperature applications.

The SM6T75AY from STMicroelectronics maintains the same voltage standoff and breakdown specifications but exhibits a higher clamping voltage (134V vs. 103V) and significantly higher peak pulse current capability (30A vs. 5.9A). This part is AEC-Q101 qualified and RoHS3 compliant, making it suitable for applications requiring enhanced transient suppression performance. The higher clamping voltage and current rating represent a performance upgrade rather than a direct equivalent.

Frequently Asked Questions (FAQ)

Q: Can the P6SMB75A_R1_00001 be used as a direct replacement for the TPSMB75A?

A: Yes. Both parts share identical reverse standoff voltage (64.1V), breakdown voltage (71.3V), and clamping voltage (103V) specifications. Peak pulse current ratings are equivalent (5.9A vs. 5.8A). Both use the DO-214AA SMB package and are RoHS3 compliant. The primary difference is the operating temperature range; the Panjit part operates from -55°C to 150°C versus -65°C to 175°C for the Littelfuse part.

Q: Is the SM6T75AY a direct equivalent to the TPSMB75A?

A: The SM6T75AY is not a direct equivalent. While it matches the voltage standoff and breakdown specifications, it has a higher clamping voltage (134V vs. 103V) and significantly higher peak pulse current (30A vs. 5.9A). This represents a performance upgrade suitable for applications requiring enhanced transient protection, but circuit behavior will differ due to the higher clamping voltage.

Q: Are all substitute parts available in the same package?

A: Yes. The TPSMB75A, P6SMB75A_R1_00001, and SM6T75AY are all available in the DO-214AA SMB surface mount package, ensuring mechanical and electrical compatibility on printed circuit boards.

Q: What compliance certifications should I verify when selecting a substitute?

A: For automotive applications, AEC-Q101 qualification is a critical specification. The TPSMB75A and SM6T75AY both carry AEC-Q101 qualification. The P6SMB75A_R1_00001 does not list AEC-Q101 qualification. All three parts are RoHS3 compliant and REACH affected or unaffected as specified in their datasheets.

Q: How do the operating temperature ranges affect substitution?

A: The TPSMB75A operates from -65°C to 175°C, while both substitute parts operate from -55°C to 150°C. In applications operating below -55°C or above 150°C, the Littelfuse part is required. For standard industrial and automotive temperature ranges, the narrower range of substitute parts is typically acceptable.

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