TPSMD33A Equivalent & Substitute Parts

Part Overview

The TPSMD33A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the DO-214AB (SMC) package. This component provides transient overvoltage protection with a 33V reverse standoff voltage and 3000W peak pulse power rating. The part is actively produced and carries AEC-Q101 automotive qualification with ROHS3 compliance. Equivalent and substitute parts are identified when they maintain identical electrical performance parameters and mechanical compatibility within the same package family.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33	V
Voltage - Breakdown (Min)	36.7	V
Voltage - Clamping (Max) @ Ipp	53.3	V
Current - Peak Pulse (10/1000µs)	56.3	A
Power - Peak Pulse	3000	W
Type	Zener	-
Unidirectional Channels	1	-
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Operating Temperature Range	-65 to 150	°C
RoHS Status	ROHS3 Compliant	-
Product Status	Active	-

Substitute Part Grouping Explanation

Substitution of the TPSMD33A is valid when the following electrical and mechanical parameters are maintained:

Voltage - Reverse Standoff (Typ): 33V
Voltage - Breakdown (Min): 36.7V
Voltage - Clamping (Max) @ Ipp: 53.3V
Current - Peak Pulse (10/1000µs): 56.3A
Power - Peak Pulse: 3000W
Type: Zener, Unidirectional (1 channel)
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Product Status: Active
RoHS Status: ROHS3 Compliant

All identified substitute parts meet these criteria. Variations in operating temperature range, packaging format (Tape & Reel vs. Cut Tape), and manufacturer-specific series designations do not affect functional equivalence when electrical specifications and package dimensions remain identical.

Parameter Comparison

Parameter	TPSMD33A (Littelfuse)	SMDJ33A (Alpha & Omega)	SM30T39AY (STMicroelectronics)	SMDJE33AH (Eaton)
Voltage - Reverse Standoff (Typ)	33V	33V	33V	33V
Voltage - Breakdown (Min)	36.7V	36.7V	36.7V	36.7V
Voltage - Clamping (Max) @ Ipp	53.3V	53.3V	53.3V	53.3V
Current - Peak Pulse (10/1000µs)	56.3A	56.3A	56.3A	56.3A
Power - Peak Pulse	3000W	3000W	3000W	3000W
Type	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 175°C	-55 to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active
AEC-Q101 Qualification	Yes	Not specified	Yes	Yes

Engineering Selection Recommendations

All four parts listed maintain identical electrical performance specifications and surface mount DO-214AB (SMC) package compatibility. Selection among these equivalents should be based on:

Availability and Lead Time: SMDJ33A (Alpha & Omega) offers the highest inventory level at 230,383 pieces. TPSMD33A (Littelfuse) maintains 26,400 pieces. SM30T39AY (STMicroelectronics) and SMDJE33AH (Eaton) have lower stock levels at 2,400 and 3,221 pieces respectively.

Automotive Qualification: TPSMD33A, SM30T39AY, and SMDJE33AH all carry AEC-Q101 automotive qualification. SMDJ33A does not specify this qualification.

Operating Temperature Range: SM30T39AY supports the widest operating temperature range (-55 to 175°C). TPSMD33A supports -65 to 150°C, providing the lowest minimum temperature. SMDJ33A and SMDJE33AH both support -55 to 150°C.

Packaging Format: TPSMD33A and SMDJE33AH are supplied in Tape & Reel format. SM30T39AY is supplied in Cut Tape & Digi-Reel format. SMDJ33A packaging format is not specified.

All parts are ROHS3 compliant and actively produced. Direct substitution is electrically and mechanically valid across all four part numbers.

Frequently Asked Questions (FAQ)

Q: Can SMDJ33A replace TPSMD33A in automotive applications?

A: SMDJ33A maintains identical electrical specifications and package compatibility. However, SMDJ33A does not specify AEC-Q101 automotive qualification, while TPSMD33A carries this certification. For applications requiring automotive qualification, TPSMD33A, SM30T39AY, or SMDJE33AH are preferred.

Q: What is the difference between the operating temperature ranges?

A: TPSMD33A operates from -65 to 150°C, SM30T39AY from -55 to 175°C, and both SMDJ33A and SMDJE33AH from -55 to 150°C. Selection depends on the specific thermal environment of the application. All parts maintain identical electrical performance within their respective operating ranges.

Q: Are all parts compatible with the same PCB footprint?

A: Yes. All four parts use the DO-214AB (SMC) package, which defines identical mechanical dimensions and pin configuration. PCB footprints are directly interchangeable.

Q: What does the 10/1000µs specification mean for peak pulse current?

A: This indicates the peak pulse current rating of 56.3A is measured under a 10/1000 microsecond pulse waveform, which is the standard test condition for TVS diode specifications.

Q: Can I substitute based on packaging format alone?

A: No. While packaging format (Tape & Reel vs. Cut Tape) affects handling and assembly processes, it does not affect electrical performance or functional equivalence. Substitution is valid based on electrical specifications and package type (DO-214AB, SMC), regardless of supply format.

Q: Why is ROHS3 compliance important for these parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. All four substitute parts are ROHS3 compliant, ensuring regulatory compliance across all options.

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