TPSMC33AHE3_A/I Equivalent & Substitute Parts

Part Overview

The TPSMC33AHE3_A/I is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the PAR® series. This surface mount component in DO-214AB (SMCJ) package is designed for transient voltage protection applications with a reverse standoff voltage of 28.2V and peak pulse power rating of 1500W. The part is currently obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28.2	V
Voltage - Breakdown (Min)	31.4	V
Voltage - Clamping (Max) @ Ipp	45.7	V
Current - Peak Pulse (10/1000µs)	32.8	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-65°C ~ 185°C	TJ
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the TPSMC33AHE3_A/I is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - Reverse Standoff (Typ): 28.2V
Voltage - Breakdown (Min): 31.4V
Voltage - Clamping (Max) @ Ipp: 45.7V
Current - Peak Pulse (10/1000µs): 32.8A minimum
Power - Peak Pulse: 1500W (1.5kW)

Mechanical Compatibility Requirements:

Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional Channels: 1

Compliance Requirements:

RoHS3 Compliant
Automotive Grade (preferred for AEC-Q101 qualified designs)

Substitute parts are grouped into two categories: direct electrical equivalents with identical voltage and current ratings, and alternative designs with differing electrical parameters that require application-level verification.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	Breakdown Min (V)	Clamp Max (V)	Ipp (A)	Power (W)	Temp Range (°C)	Package	Status	AEC-Q101
TPSMC33AHE3_A/I	Vishay	28.2	31.4	45.7	32.8	1500	-65 to 185	DO-214AB (SMCJ)	Obsolete	Yes
1.5SMC33A-E3/57T	Vishay	28.2	31.4	45.7	32.8	1500	-65 to 150	DO-214AB (SMCJ)	Active	No
1.5SMC33A-M3/57T	Vishay	28.2	31.4	45.7	32.8	1500	-65 to 150	DO-214AB (SMCJ)	Active	No
1.5SMC33A-M3/9AT	Vishay	28.2	31.4	45.7	32.8	1500	-65 to 150	DO-214AB (SMCJ)	Active	No
TPSMC33AHE3_B/I	Vishay	28.2	31.4	45.7	32.8	1500	-65 to 185	DO-214AB (SMC)	Active	Yes
SZ1.5SMC33AT3G	Littelfuse	28.2	31.4	45.7	33	1500	-65 to 150	DO-214AB (SMC)	Active	Yes
TPSMC33A	Littelfuse	28.2	31.4	45.7	33.3	1500	-55 to 150	DO-214AB (SMCJ)	Active	Yes
SM15T33AY	STMicroelectronics	28.2	31.4	59	169 (8/20µs)	1500	-40 to 150	DO-214AB (SMC)	Active	Yes
SMCJ24A	EVVO Semi	24	26.7	38.9	38.6	600	-65 to 150	DO-214AC (SMA)	Active	No

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Voltage & Current Ratings):

For applications requiring exact electrical performance match with the obsolete TPSMC33AHE3_A/I, the following active parts provide identical 28.2V standoff, 31.4V breakdown, 45.7V clamp, and 32.8A peak pulse specifications:

TPSMC33AHE3_B/I (Vishay): Active equivalent with identical electrical parameters and extended temperature range (-65°C to 185°C). Maintains AEC-Q101 automotive qualification. Recommended for direct replacement in automotive applications requiring the full temperature range.
1.5SMC33A-E3/57T (Vishay): Active equivalent with identical electrical parameters. Operating temperature reduced to -65°C to 150°C. Suitable for non-extended-temperature applications. Available in Cut Tape and Digi-Reel packaging.
1.5SMC33A-M3/57T (Vishay): Active equivalent with identical electrical parameters and Tape & Reel packaging. Operating temperature -65°C to 150°C.
1.5SMC33A-M3/9AT (Vishay): Active equivalent with identical electrical parameters and alternative Tape & Reel configuration. Operating temperature -65°C to 150°C.

Cross-Manufacturer Equivalents (Identical Voltage & Current Ratings):

SZ1.5SMC33AT3G (Littelfuse): Maintains 28.2V standoff, 31.4V breakdown, 45.7V clamp, and 33A peak pulse (within tolerance of 32.8A specification). AEC-Q101 qualified. Operating temperature -65°C to 150°C. Recommended for applications where cross-manufacturer sourcing is acceptable.
TPSMC33A (Littelfuse): Maintains 28.2V standoff, 31.4V breakdown, 45.7V clamp, and 33.3A peak pulse (within tolerance). AEC-Q101 qualified. Operating temperature -55°C to 150°C (minimum temperature reduced to -55°C). Suitable where lower minimum temperature is not required.

Alternative Electrical Specifications (Differing Parameters):

SM15T33AY (STMicroelectronics): Maintains 28.2V standoff and 31.4V breakdown but differs in clamping voltage (59V vs. 45.7V) and peak pulse current (169A at 8/20µs vs. 32.8A at 10/1000µs). AEC-Q101 qualified. Application-level verification required to confirm compatibility with circuit protection requirements.
SMCJ24A (EVVO Semi): Differs significantly in voltage rating (24V standoff vs. 28.2V), clamping voltage (38.9V vs. 45.7V), peak pulse current (38.6A vs. 32.8A), and power rating (600W vs. 1500W). Package is DO-214AC (SMA) instead of DO-214AB (SMC). Not recommended as direct substitute; application redesign required.

Frequently Asked Questions (FAQ)

Q: Can I use 1.5SMC33A-E3/57T as a direct replacement for the obsolete TPSMC33AHE3_A/I?

A: Yes, electrically. The 1.5SMC33A-E3/57T provides identical voltage and current ratings (28.2V standoff, 31.4V breakdown, 45.7V clamp, 32.8A peak pulse). The primary difference is operating temperature range: the substitute operates to 150°C maximum versus 185°C for the original. If your application does not require operation above 150°C junction temperature, this part is a direct substitute. Both use DO-214AB (SMCJ) packaging and are surface mount compatible.

Q: What is the difference between TPSMC33AHE3_B/I and the obsolete TPSMC33AHE3_A/I?

A: The TPSMC33AHE3_B/I is the active production equivalent of the obsolete TPSMC33AHE3_A/I. Both are Vishay PAR® series parts with identical electrical specifications (28.2V standoff, 45.7V clamp, 32.8A peak pulse, 1500W power). Both maintain the extended operating temperature range of -65°C to 185°C and AEC-Q101 automotive qualification. The primary difference is product status: the _A/I variant is obsolete while the _B/I variant is in active production. For new designs and production continuity, TPSMC33AHE3_B/I is the recommended choice.

Q: Can I substitute a Littelfuse part for the Vishay original?

A: Yes, with verification. SZ1.5SMC33AT3G (Littelfuse) provides equivalent electrical performance with 28.2V standoff, 31.4V breakdown, 45.7V clamp, and 33A peak pulse (within tolerance of the 32.8A specification). It is AEC-Q101 qualified and uses the same DO-214AB (SMC) package. TPSMC33A (Littelfuse) similarly provides equivalent performance with 33.3A peak pulse. Both are active production parts. Cross-manufacturer substitution is acceptable when supplier qualification and procurement processes permit.

Q: Why is the operating temperature range different between substitute parts?

A: Operating temperature range reflects the thermal design and qualification testing of each manufacturer's process. The original TPSMC33AHE3_A/I and its active equivalent TPSMC33AHE3_B/I are qualified to -65°C to 185°C. Most alternative 1.5SMC33A variants are qualified to -65°C to 150°C. If your application requires junction temperatures above 150°C, select TPSMC33AHE3_B/I or verify that the substitute part's maximum temperature is sufficient for your thermal design.

Q: What does "AEC-Q101" qualification mean?

A: AEC-Q101 is the Automotive Electronics Council qualification standard for discrete semiconductors. It certifies that the component has undergone rigorous testing for reliability, performance, and environmental stress in automotive applications. Parts bearing AEC-Q101 qualification (such as TPSMC33AHE3_B/I, SZ1.5SMC33AT3G, and TPSMC33A) are approved for use in automotive designs. Non-qualified parts may be acceptable for industrial or consumer applications but should not be used in automotive circuits without explicit design approval.

Q: Can I use SM15T33AY as a substitute?

A: SM15T33AY differs in electrical specifications and requires application-level verification. While it maintains the 28.2V standoff and 31.4V breakdown voltages, the clamping voltage is 59V (versus 45.7V) and peak pulse current is 169A at 8/20µs (versus 32.8A at 10/1000µs). These differences affect transient suppression performance. Use SM15T33AY only if circuit analysis confirms that the higher clamping voltage and different pulse waveform are compatible with your protection requirements. It is AEC-Q101 qualified and suitable for automotive applications.

Q: Why is SMCJ24A listed as a substitute if it has different voltage ratings?

A: SMCJ24A is listed as a reference point only and is not recommended as a direct substitute. It operates at 24V standoff (versus 28.2V), has lower clamping voltage (38.9V versus 45.7V), lower peak pulse current (38.6A versus 32.8A), and significantly lower power rating (600W versus 1500W). Additionally, it uses DO-214AC (SMA) package instead of DO-214AB (SMC). Substitution would require complete circuit redesign and is not recommended for direct replacement applications.

Q: What packaging options are available for substitute parts?

A: The original TPSMC33AHE3_A/I uses DO-214AB (SMCJ) surface mount package. Direct electrical equivalents maintain this package:

1.5SMC33A-E3/57T: DO-214AB (SMCJ), available in Cut Tape and Digi-Reel
1.5SMC33A-M3/57T: DO-214AB (SMCJ), Tape & Reel
1.5SMC33A-M3/9AT: DO-214AB (SMCJ), Tape & Reel
TPSMC33AHE3_B/I: DO-214AB (SMC), Tape & Reel
SZ1.5SMC33AT3G: DO-214AB (SMC), Tape & Reel
TPSMC33A: DO-214AB (SMCJ), Tape & Reel

All are surface mount compatible with identical PCB footprints. Packaging format (Cut Tape, Digi-Reel, or Tape & Reel) affects procurement and assembly processes but not electrical or mechanical compatibility.

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