TPSMB15A Equivalent & Substitute Parts

Part Overview

The TPSMB15A is a unidirectional Zener 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 12.8V and provides transient protection with a clamping voltage of 21.2V at peak pulse current. The part is active in production, AEC-Q101 qualified for automotive applications, and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the TVS diode category.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	12.8	V
Voltage - Breakdown (Min)	14.3	V
Voltage - Clamping (Max) @ Ipp	21.2	V
Current - Peak Pulse (10/1000µs)	28.8	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution eligibility for the TPSMB15A is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Reverse Standoff (Typ): 12.8V
Voltage - Breakdown (Min): 14.3V
Voltage - Clamping (Max) @ Ipp: 21.2V
Current - Peak Pulse (10/1000µs): 28.8A (±tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Unidirectional Channels: 1

Secondary Compatibility Factors:

Operating Temperature Range: Minimum -55°C to maximum 150°C acceptable for most applications; TPSMB15A extends to 175°C
RoHS Status: ROHS3 Compliant required
Moisture Sensitivity Level: 1 (Unlimited)

Parts are grouped into two categories based on electrical performance alignment:

Group A - Full Electrical Match (21.2V Clamp, 28.8A Ipp): P6SMB15A (Eaton), SMBJP6KE15A-TP (Micro Commercial Co), P6SMB15A-E3/52 (Vishay), P6SMB15A-E3/5B (Vishay), SZP6SMB15AT3G (Littelfuse)

Group B - Partial Electrical Variance (27.2V Clamp, 147A Ipp): SM6T15AY (STMicroelectronics), SM6T15A (STMicroelectronics), SM6T15A-E3/52 (Vishay), SM6T15A-E3/5B (Vishay)

Group B parts exhibit higher clamping voltage and peak pulse current specifications and are suitable only when circuit design permits higher transient voltage suppression levels.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Operating Temperature (°C)	Package	RoHS Status	Automotive Grade
TPSMB15A	Littelfuse Inc.	12.8	21.2	28.8	-65 to 175	DO-214AA, SMB	ROHS3	Yes (AEC-Q101)
P6SMB15A	Eaton - Electronics Division	12.8	21.2	28.8	-55 to 150	DO-214AA, SMB	RoHS	No
SZP6SMB15AT3G	Littelfuse Inc.	12.8	21.2	28	-65 to 150	DO-214AA, SMB	ROHS3	Yes (AEC-Q101)
SM6T15AY	STMicroelectronics	12.8	27.2	147 (8/20µs)	-55 to 150	DO-214AA, SMB	ROHS3	Yes (AEC-Q101)
SMBJP6KE15A-TP	Micro Commercial Co	12.8	21.2	28.8	-55 to 175	DO-214AA, SMB	ROHS3	No
P6SMB15A-E3/5B	Vishay General Semiconductor - Diodes Division	12.8	21.2	28.3	-65 to 150	DO-214AA, SMB	ROHS3	No
SM6T15A	STMicroelectronics	12.8	27.2	147 (8/20µs)	-55 to 150	DO-214AA, SMB	ROHS3	No
SM6T15A-E3/52	Vishay General Semiconductor - Diodes Division	12.8	21.2	28	-65 to 150	DO-214AA, SMB	ROHS3	No
SM6T15A-E3/5B	Vishay General Semiconductor - Diodes Division	12.8	21.2	28	-65 to 150	DO-214AA, SMB	ROHS3	No

Engineering Selection Recommendations

For Automotive Applications (AEC-Q101 Required): SZP6SMB15AT3G (Littelfuse Inc.) is the primary equivalent substitute. This part maintains identical reverse standoff voltage (12.8V), clamping voltage (21.2V), and peak pulse power (600W) specifications. It carries AEC-Q101 automotive qualification and ROHS3 compliance matching the TPSMB15A. Operating temperature range extends to -65°C, supporting the full automotive thermal envelope. Peak pulse current is 28A, within acceptable tolerance of the 28.8A specification.

For Non-Automotive Applications with Extended Temperature Range: SMBJP6KE15A-TP (Micro Commercial Co) provides full electrical equivalence with operating temperature range of -55°C to 175°C, matching the TPSMB15A upper temperature limit. This part is suitable for industrial and consumer applications requiring high-temperature performance.

For General Purpose Applications: P6SMB15A-E3/5B (Vishay General Semiconductor - Diodes Division) and P6SMB15A-E3/52 (Vishay General Semiconductor - Diodes Division) deliver electrical equivalence with 21.2V clamping and 28.3A peak pulse current. Both are ROHS3 compliant and support operating temperatures from -65°C to 150°C.

For Higher Transient Suppression Requirements: SM6T15A-E3/52 and SM6T15A-E3/5B (Vishay General Semiconductor - Diodes Division) provide elevated clamping voltage of 21.2V with 28A peak pulse current. These parts are suitable when circuit design requires enhanced transient protection margins.

Frequently Asked Questions (FAQ)

Q: Can SM6T15AY or SM6T15A be used as direct replacements for TPSMB15A?

A: SM6T15AY and SM6T15A are not direct electrical equivalents. These parts feature 27.2V clamping voltage and 147A peak pulse current (8/20µs), compared to TPSMB15A specifications of 21.2V clamping and 28.8A peak pulse current (10/1000µs). Use these parts only if circuit design specifications permit higher transient voltage suppression levels. Both maintain the same 12.8V reverse standoff voltage and DO-214AA package compatibility.

Q: What is the difference between packaging designations CT (Cut Tape) and TR (Tape & Reel)?

A: Cut Tape (CT) and Digi-Reel® packaging are supplied in continuous tape format suitable for manual or semi-automated assembly. Tape & Reel (TR) packaging is supplied on full reels for automated pick-and-place assembly. Both packaging formats contain identical components; selection depends on assembly process requirements and order quantity.

Q: Is P6SMB15A from Eaton suitable for automotive applications?

A: P6SMB15A from Eaton - Electronics Division is not AEC-Q101 qualified and does not carry automotive grade designation. This part is suitable for telecom and industrial applications. For automotive applications requiring AEC-Q101 qualification, use SZP6SMB15AT3G (Littelfuse Inc.) or equivalent automotive-qualified alternatives.

Q: What is the significance of the -E3/5B and -E3/52 suffixes in Vishay part numbers?

A: The -E3/5B and -E3/52 suffixes indicate Vishay packaging and tape configuration variants. Both variants contain identical electrical specifications and performance characteristics. Selection between these variants depends on tape format compatibility with assembly equipment.

Q: Can TPSMB15A operate at 175°C continuously?

A: The operating temperature range -65°C to 175°C represents the maximum junction temperature (TJ) specification. Continuous operation at 175°C is dependent on circuit thermal management and power dissipation. Consult device datasheets for derating curves and thermal performance under specific application conditions.

Q: Are all listed substitute parts RoHS3 compliant?

A: All substitute parts listed carry ROHS3 compliance status. P6SMB15A from Eaton carries RoHS compliance (not ROHS3). Verify specific RoHS certification requirements for your application before final component selection.

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