SMBJ51A-M3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ51A-M3/5B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 51V reverse standoff voltage class and is designed for general-purpose transient protection applications. The part is active in production and fully compliant with RoHS3 and REACH regulations. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	51	V
Voltage - Breakdown (Min)	56.7	V
Voltage - Clamping (Max) @ Ipp	82.4	V
Current - Peak Pulse (10/1000µs)	7.3	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AA, SMB	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ51A-M3/5B is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 51V
Voltage - Clamping (Max) @ Ipp: 82.4V
Current - Peak Pulse (10/1000µs): 7.3A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB (Surface Mount)
Unidirectional Channels: 1
Type: Zener
RoHS Status: ROHS3 Compliant

Substitute parts must match all critical electrical parameters and package specifications. Parts are grouped by manufacturer and packaging variant while maintaining identical electrical performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Operating Temp (°C)	RoHS Status
SMBJ51A-M3/5B	Vishay	51	82.4	7.3	600	DO-214AA, SMB	-55 to 150	ROHS3
SMBJ51A-E3/52	Vishay	51	82.4	7.3	600	DO-214AA, SMB	-55 to 150	ROHS3
SMBJ51D-M3/I	Vishay	51	81.2	7.4	600	DO-214AA, SMB	-55 to 150	ROHS3
SMBJ51A	Good-Ark Semiconductor	51	82.4	7.3	600	DO-214AA, SMB	-55 to 150	ROHS3
SMBJ51A-13-F	Diodes Incorporated	51	82.4	7.3	600	DO-214AA, SMB	-55 to 150	ROHS3
SMBJ51A-TP	Micro Commercial Co	51	82.4	7.3	600	DO-214AA, SMB	-55 to 175	ROHS3
SZ1SMB51AT3G	Littelfuse Inc.	51	82.4	7.3	600	DO-214AA, SMB	-65 to 150	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain identical electrical performance specifications and package compatibility with the SMBJ51A-M3/5B. Selection among equivalent parts should be based on:

Manufacturer Availability: Vishay SMBJ51A-E3/52 provides direct manufacturer equivalence with identical specifications and packaging.

Extended Temperature Range: SMBJ51A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, compared to 150°C for the primary part. SZ1SMB51AT3G (Littelfuse Inc.) extends the lower operating temperature to -65°C and includes AEC-Q101 automotive qualification.

Regulatory Compliance: All substitute parts are ROHS3 compliant and REACH unaffected, meeting standard industrial and commercial requirements.

Inventory and Lead Time: Good-Ark Semiconductor SMBJ51A offers the highest inventory availability (17,300 pcs), supporting rapid procurement needs.

Frequently Asked Questions (FAQ)

Q: Can SMBJ51D-M3/I be used as a direct substitute for SMBJ51A-M3/5B?

A: SMBJ51D-M3/I is functionally compatible but exhibits slightly different clamping voltage (81.2V vs. 82.4V) and peak pulse current (7.4A vs. 7.3A). Both parts maintain the same 51V reverse standoff voltage and 600W peak pulse power rating. Application-specific circuit analysis is required to determine acceptability.

Q: What is the difference between packaging variants (Tape & Reel vs. Cut Tape)?

A: Tape & Reel (TR) packaging is supplied on continuous tape for automated assembly processes. Cut Tape (CT) and Digi-Reel® packaging provide smaller quantity options. Both packaging formats contain identical components in DO-214AA, SMB package configuration.

Q: Is SZ1SMB51AT3G suitable for automotive applications?

A: SZ1SMB51AT3G carries AEC-Q101 automotive qualification and operates across -65°C to 150°C, making it suitable for automotive-grade applications. Other substitute parts do not carry automotive qualification.

Q: Are all substitute parts surface mount compatible?

A: Yes. All listed substitute parts are surface mount components in DO-214AA (SMB) package configuration, compatible with standard PCB assembly processes.

Q: What determines substitution eligibility?

A: Substitution is based on matching reverse standoff voltage (51V), clamping voltage (82.4V), peak pulse current (7.3A), power rating (600W), package type (DO-214AA, SMB), and regulatory compliance (ROHS3). Minor variations in clamping voltage or peak pulse current may require circuit-level evaluation.

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