TPSMC51A Equivalent & Substitute Parts

Part Overview

The TPSMC51A is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the DO-214AB package. This unidirectional Zener diode provides transient voltage protection with a 43.6V reverse standoff voltage and 70.1V maximum clamping voltage. The part is AEC-Q101 qualified for automotive applications and RoHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

TPSMC51A

Littelfuse Inc.In Stock: 1304TPSMC51A Datasheet

Current PartRFQ

1.5SMC51A

Taiwan Semiconductor CorporationIn Stock: 122931.5SMC51A Datasheet

DirectRFQ

SMCJ1.5KE51A-TP

Micro Commercial CoIn Stock: 9184SMCJ1.5KE51A-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TPSMC51A are qualified based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 43.6V
• Voltage - Breakdown (Min): 48.5V
• Voltage - Clamping (Max) @ Ipp: 70.1V
• Current - Peak Pulse (10/1000µs): 21.7A minimum
• Power - Peak Pulse: 1500W
• Type: Zener, Unidirectional (1 channel)

Mechanical Compatibility Criteria:

• Package / Case: DO-214AB (SMC)
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C minimum to 150°C maximum

The identified substitute parts meet or exceed these parameters within the specified tolerances and maintain functional equivalence for transient voltage suppression applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain identical electrical performance for the critical voltage and current parameters. Selection between TPSMC51A, 1.5SMC51A, and SMCJ1.5KE51A-TP should be based on the following factors:

TPSMC51A (Littelfuse Inc.): Primary choice for automotive applications requiring AEC-Q101 qualification. Automotive-grade certification is explicitly stated. Tape & Reel packaging supports high-volume production environments.

1.5SMC51A (Taiwan Semiconductor Corporation): Functionally equivalent with identical electrical specifications. Suitable for general telecom and industrial applications. Higher inventory availability (12,200 pcs) supports rapid procurement.

SMCJ1.5KE51A-TP (Micro Commercial Co): Functionally equivalent with extended operating temperature range to 175°C, providing additional thermal margin. Tape & Reel packaging. Suitable for general purpose applications with higher temperature requirements.

All parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 rating. Selection should prioritize application-specific requirements: automotive qualification for TPSMC51A, extended temperature performance for SMCJ1.5KE51A-TP, or inventory availability for 1.5SMC51A.

Frequently Asked Questions (FAQ)

Q: Can 1.5SMC51A replace TPSMC51A in automotive applications? A: The 1.5SMC51A meets all electrical and mechanical specifications for functional equivalence. However, TPSMC51A carries explicit AEC-Q101 automotive qualification. Use 1.5SMC51A only if automotive qualification is not a design requirement.

Q: What is the difference between SMCJ1.5KE51A-TP and TPSMC51A? A: Both parts are electrically identical at the critical parameters (voltage, current, power). SMCJ1.5KE51A-TP extends the operating temperature range to 175°C versus 150°C for TPSMC51A. Select SMCJ1.5KE51A-TP for applications requiring higher temperature performance.

Q: Are all three parts in the same package? A: Yes. All three parts use the DO-214AB (SMC) surface mount package and are mechanically interchangeable on PCBs designed for this footprint.

Q: What is the peak pulse current difference between 1.5SMC51A (22A) and TPSMC51A (21.7A)? A: The 1.5SMC51A provides 0.3A higher peak pulse current capacity. This represents a 1.4% increase and does not affect substitution compatibility for applications designed around the 21.7A specification.

Q: Are all parts RoHS and REACH compliant? A: Yes. All three parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Which part should I select for new designs? A: For automotive applications, specify TPSMC51A (AEC-Q101 qualified). For non-automotive applications with standard temperature requirements, either 1.5SMC51A or SMCJ1.5KE51A-TP is acceptable. For applications requiring extended temperature performance, select SMCJ1.5KE51A-TP.