TPSMB51A Equivalent & Substitute Parts

Part Overview

The TPSMB51A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the DO-214AA (SMBJ) package. This component provides transient voltage protection with a 43.6V reverse standoff voltage and 70.1V maximum clamping voltage 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 to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

TPSMB51A

Littelfuse Inc.In Stock: 3063TPSMB51A Datasheet

Current PartRFQ

P6SMB51A

Eaton - Electronics DivisionIn Stock: 6228P6SMB51A Datasheet

DirectRFQ

SZP6SMB51AT3G

Littelfuse Inc.In Stock: 2732SZP6SMB51AT3G Datasheet

MFR RecommendedRFQ

SMBJP6KE51A-TP

Micro Commercial CoIn Stock: 3494SMBJP6KE51A-TP Datasheet

DirectRFQ

P6SMB51A-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 10013P6SMB51A-E3/52 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPSMB51A is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 43.6V
• Voltage - Breakdown (Min): 48.5V
• Voltage - Clamping (Max) @ Ipp: 70.1V
• Current - Peak Pulse (10/1000µs): 8.7A (or 8.6A within manufacturing tolerance)
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Type: Zener, Unidirectional
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Four substitute parts meet these criteria across all critical electrical specifications and package requirements. Variations in operating temperature range and specific certifications are noted but do not preclude functional equivalence for standard applications.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts are active in production and meet the core electrical and mechanical specifications of the TPSMB51A. Selection should be based on the following criteria:

Automotive Applications: The TPSMB51A and SZP6SMB51AT3G both carry automotive grade designation and AEC-Q101 qualification. These parts are preferred for automotive circuit protection applications where qualification standards are mandatory.

General Purpose Applications: The P6SMB51A (Eaton), SMBJP6KE51A-TP (Micro Commercial Co), and P6SMB51A-E3/52 (Vishay) are suitable for general purpose transient voltage suppression where automotive qualification is not required.

Temperature Range Considerations: The TPSMB51A and SMBJP6KE51A-TP support the full operating temperature range of -65°C to 175°C. The P6SMB51A, SZP6SMB51AT3G, and P6SMB51A-E3/52 are rated to -65°C or -55°C minimum and 150°C maximum. Applications requiring operation above 150°C should specify TPSMB51A or SMBJP6KE51A-TP.

RoHS Compliance: All parts are RoHS compliant. TPSMB51A, SZP6SMB51AT3G, SMBJP6KE51A-TP, and P6SMB51A-E3/52 are ROHS3 compliant. P6SMB51A is RoHS compliant.

Inventory and Availability: Substitute parts are available from multiple manufacturers, supporting supply chain flexibility and procurement continuity.

Frequently Asked Questions (FAQ)

Q: Can P6SMB51A (Eaton) be used as a direct replacement for TPSMB51A?

A: Yes. The P6SMB51A meets all critical electrical specifications: 43.6V reverse standoff, 48.5V breakdown minimum, 70.1V clamping maximum, and 8.7A peak pulse current. Both use the DO-214AA SMB package. The operating temperature range differs (-55°C to 150°C for P6SMB51A versus -65°C to 175°C for TPSMB51A), which may be a consideration for extreme temperature applications. The P6SMB51A is not automotive qualified.

Q: What is the difference between SZP6SMB51AT3G and TPSMB51A?

A: Both are Littelfuse products with automotive grade and AEC-Q101 qualification. Electrical specifications are equivalent: 43.6V standoff, 70.1V clamping, and 600W peak power. The SZP6SMB51AT3G has a peak pulse current of 8.6A (versus 8.7A for TPSMB51A) and operates to 150°C maximum (versus 175°C for TPSMB51A). These differences are within manufacturing tolerance and do not affect functional equivalence for standard protection applications.

Q: Are all substitute parts in the same package?

A: Yes. All parts use the DO-214AA SMB surface mount package, ensuring mechanical and footprint compatibility on printed circuit boards.

Q: Which substitute part should be selected for automotive applications?

A: For automotive applications requiring AEC-Q101 qualification, select either SZP6SMB51AT3G or TPSMB51A, both from Littelfuse. Both carry automotive grade designation and meet automotive qualification standards.

Q: What is the peak pulse current tolerance across substitute parts?

A: The TPSMB51A, P6SMB51A, and SMBJP6KE51A-TP are rated at 8.7A peak pulse current. The SZP6SMB51AT3G and P6SMB51A-E3/52 are rated at 8.6A. This 0.1A difference is within standard manufacturing tolerance for TVS diodes and does not affect circuit protection performance.

Q: Are all parts RoHS3 compliant?

A: Four of the five parts are ROHS3 compliant: TPSMB51A, SZP6SMB51AT3G, SMBJP6KE51A-TP, and P6SMB51A-E3/52. The P6SMB51A (Eaton) is RoHS compliant but not specifically ROHS3 certified. Verify compliance requirements for your application.