TPSMC27AHE3_A/I Equivalent & Substitute Parts

Part Overview

The TPSMC27AHE3_A/I is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, classified as an obsolete product. This component is designed for surface mount applications in the DO-214AB (SMC) package and provides 37.5V clamping protection at 40A peak pulse current with 1500W peak pulse power handling. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	TPSMC27AHE3_A/I
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	23.1V
Voltage - Breakdown (Min)	25.7V
Voltage - Clamping (Max) @ Ipp	37.5V
Current - Peak Pulse (10/1000µs)	40A
Power - Peak Pulse	1500W (1.5kW)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 185°C (TJ)
Grade	Automotive
Qualification	AEC-Q101
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TPSMC27AHE3_A/I is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 23.1V
Voltage - Breakdown (Min): 25.7V
Voltage - Clamping (Max) @ Ipp: 37.5V
Current - Peak Pulse (10/1000µs): 40A
Power - Peak Pulse: 1500W (1.5kW)
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional Channels: 1

Direct Substitutes (Identical Electrical and Mechanical Parameters): Parts meeting all primary criteria with active product status are classified as direct substitutes. These include 1.5SMC27A-E3/57T, 1.5SMC27A-M3/57T, SM15T27A-M3/9AT, and TPSMC27AHE3_B/I.

Functional Equivalents (Comparable Performance with Parameter Variations): Parts with matching reverse standoff and breakdown voltages but differing clamping voltage, peak pulse current, or operating temperature range are classified as functional equivalents. These include SM15T27AY (STMicroelectronics), SMCJ24A (EVVO Semi), SMCJ26A (MDD), and SMCJ28A (Meritek).

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ)	Vbr (Min)	Vc (Max) @ Ipp	Ipp (10/1000µs)	Ppk	Package	Temp Range	Status
TPSMC27AHE3_A/I	Vishay	23.1V	25.7V	37.5V	40A	1500W	DO-214AB (SMC)	-65°C ~ 185°C	Obsolete
1.5SMC27A-E3/57T	Vishay	23.1V	25.7V	37.5V	40A	1500W	DO-214AB (SMC)	-65°C ~ 150°C	Active
1.5SMC27A-M3/57T	Vishay	23.1V	25.7V	37.5V	40A	1500W	DO-214AB (SMC)	-65°C ~ 150°C	Active
SM15T27A-M3/9AT	Vishay	23.1V	25.7V	37.5V	40A	1500W	DO-214AB (SMC)	-65°C ~ 150°C	Active
TPSMC27AHE3_B/I	Vishay	23.1V	25.7V	37.5V	40A	1500W	DO-214AB (SMC)	-65°C ~ 185°C	Active
SM15T27AY	STMicroelectronics	23.1V	25.7V	48.3V	207A (8/20µs)	1500W	DO-214AB (SMC)	-40°C ~ 150°C	Active
SMCJ24A (EVVO Semi)	EVVO Semi	24V	26.7V	38.9V	38.6A	600W	DO-214AC (SMA)	-65°C ~ 150°C	Active
SMCJ26A	MDD	26V	28.9V	42.1V	35.7A	1500W	DO-214AB (SMC)	-50°C ~ 150°C	Active
SMCJ28A	Meritek	28V	31.1V	45.4V	33.04A	1500W	DO-214AB (SMC)	-55°C ~ 150°C	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): TPSMC27AHE3_B/I is the primary active equivalent from Vishay's PAR® series, maintaining identical electrical parameters and automotive-grade AEC-Q101 qualification with extended operating temperature range (-65°C ~ 185°C). The 1.5SMC27A-E3/57T and 1.5SMC27A-M3/57T from Vishay's TransZorb® series provide identical electrical performance with active product status, though operating temperature is limited to -65°C ~ 150°C. SM15T27A-M3/9AT from the SM15T TransZorb® series offers equivalent electrical specifications with the same temperature limitation.

For Automotive Applications: TPSMC27AHE3_B/I maintains AEC-Q101 automotive qualification and is recommended for designs requiring extended temperature operation beyond -65°C ~ 150°C. SM15T27AY (STMicroelectronics) provides automotive-grade AEC-Q101 qualification with identical reverse standoff and breakdown voltages, though clamping voltage and peak pulse current differ.

For General Purpose Applications: SMCJ26A (MDD) and SMCJ28A (Meritek) provide active product status with 1500W peak pulse power handling in DO-214AB (SMC) packages. These parts accommodate slightly higher voltage ratings and maintain compatibility with surface mount assembly processes.

Package Compatibility Consideration: SMCJ24A (EVVO Semi) uses DO-214AC (SMA) package, which differs from the DO-214AB (SMC) package of the main part. This substitution requires PCB layout modification and is suitable only when package footprint change is acceptable.

Frequently Asked Questions (FAQ)

Q: Can 1.5SMC27A-E3/57T directly replace TPSMC27AHE3_A/I? A: Yes, 1.5SMC27A-E3/57T provides identical electrical parameters (23.1V standoff, 25.7V breakdown, 37.5V clamping, 40A peak pulse, 1500W power) and identical DO-214AB (SMC) package. The operating temperature range is -65°C ~ 150°C compared to the original -65°C ~ 185°C. Verify application temperature requirements before selection.

Q: What is the difference between TPSMC27AHE3_B/I and 1.5SMC27A-E3/57T? A: Both provide identical electrical specifications and DO-214AB (SMC) packaging. TPSMC27AHE3_B/I maintains the extended operating temperature range (-65°C ~ 185°C) and automotive AEC-Q101 qualification of the original part. The 1.5SMC27A series operates to -65°C ~ 150°C. Select TPSMC27AHE3_B/I for applications requiring the full temperature range or automotive certification.

Q: Can SM15T27AY substitute for TPSMC27AHE3_A/I? A: SM15T27AY maintains identical reverse standoff (23.1V) and breakdown (25.7V) voltages with automotive AEC-Q101 qualification. However, clamping voltage is 48.3V (versus 37.5V) and peak pulse current is 207A at 8/20µs (versus 40A at 10/1000µs). This part provides higher transient protection capability but operates at lower temperature minimum (-40°C versus -65°C). Substitution is valid only if circuit design accommodates higher clamping voltage.

Q: Why do SMCJ24A, SMCJ26A, and SMCJ28A have different voltage ratings? A: These parts represent alternative voltage classes within the TVS diode family. SMCJ24A targets 24V systems, SMCJ26A targets 26V systems, and SMCJ28A targets 28V systems. Selection depends on the protected circuit's nominal voltage. The original TPSMC27AHE3_A/I is rated for 23.1V standoff, making it suitable for 24V nominal systems. Parts with higher voltage ratings are not interchangeable without circuit redesign.

Q: Is package compatibility critical for substitution? A: Yes. The original part uses DO-214AB (SMC) package. Direct substitutes must use identical packaging for PCB compatibility. SMCJ24A uses DO-214AC (SMA) package, which has different footprint dimensions and requires PCB layout modification. Verify package designation before procurement.

Q: What compliance certifications apply to these substitutes? A: TPSMC27AHE3_B/I, SM15T27AY, and all listed substitutes are ROHS3 compliant and REACH unaffected. TPSMC27AHE3_B/I and SM15T27AY carry AEC-Q101 automotive qualification. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no moisture sensitivity restrictions.

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