SMBJ78A-M3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ78A-M3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 78V reverse standoff voltage class and provides transient overvoltage protection in general-purpose applications. The part is Active status and RoHS3 compliant, making it suitable for modern electronic designs requiring surge and ESD protection.

Substitute parts are necessary when the primary manufacturer part becomes unavailable, when alternative packaging configurations are required, or when sourcing from multiple qualified manufacturers is needed for supply chain resilience.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	78	V
Voltage - Breakdown (Min)	86.7	V
Voltage - Clamping (Max) @ Ipp	126	V
Current - Peak Pulse (10/1000µs)	4.8	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	-
Package / Case	DO-214AA, SMB	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ78A-M3/5B is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 78V
Voltage - Breakdown (Min): 86.7V
Voltage - Clamping (Max) @ Ipp: 126V
Current - Peak Pulse (10/1000µs): 4.7A to 4.8A
Power - Peak Pulse: 600W
Unidirectional Channels: 1
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional equivalence in transient voltage suppression applications. Packaging designations (Tape & Reel) and supplier device packages may vary while maintaining DO-214AA/SMB physical compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature Range	Package / Case	RoHS Status
SMBJ78A-M3/5B	Vishay General Semiconductor - Diodes Division	78V	86.7V	126V	4.8A	600W	-55 to 150°C	DO-214AA, SMB	ROHS3 Compliant
SMBJ78A-E3/52	Vishay General Semiconductor - Diodes Division	78V	86.7V	126V	4.8A	600W	-55 to 150°C	DO-214AA, SMB	ROHS3 Compliant
SMBJ78A	MDD	78V	86.7V	126V	4.8A	600W	-50 to 150°C	DO-214AA, SMB	ROHS3 Compliant
SMBJ78A-13-F	Diodes Incorporated	78V	86.7V	126V	4.7A	600W	-55 to 150°C	DO-214AA, SMB	ROHS3 Compliant
SMBJ78A-TP	Micro Commercial Co	78V	86.7V	126V	4.7A	600W	-55 to 175°C	DO-214AA, SMB	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, meeting current regulatory requirements for electronic component procurement.

SMBJ78A-E3/52 (Vishay) is a direct equivalent from the same manufacturer with identical electrical specifications and operating temperature range, differing only in packaging designation.

SMBJ78A (MDD) provides equivalent electrical performance with a slightly reduced lower operating temperature limit (-50°C versus -55°C). This part is suitable for applications where the minimum operating temperature requirement does not extend below -50°C.

SMBJ78A-13-F (Diodes Incorporated) and SMBJ78A-TP (Micro Commercial Co) both specify peak pulse current of 4.7A, which is within the functional tolerance of the 4.8A specification. Both parts maintain 600W peak pulse power and RoHS3 compliance. SMBJ78A-TP extends the upper operating temperature to 175°C, providing additional thermal margin in high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can SMBJ78A-E3/52 be used as a direct replacement for SMBJ78A-M3/5B?

A: Yes. Both parts are manufactured by Vishay and share identical electrical specifications: 78V reverse standoff voltage, 86.7V minimum breakdown voltage, 126V maximum clamping voltage, 4.8A peak pulse current, and 600W peak pulse power. The difference is in packaging designation only.

Q: What is the difference between the MDD SMBJ78A and the Vishay SMBJ78A-M3/5B?

A: The MDD part maintains all critical electrical parameters but specifies a minimum operating temperature of -50°C instead of -55°C. For applications operating above -50°C, this part is functionally equivalent. Both use DO-214AA/SMB packaging and are RoHS3 compliant.

Q: Are SMBJ78A-13-F and SMBJ78A-TP suitable substitutes despite the 4.7A peak pulse current specification?

A: Yes. Both parts specify 4.7A peak pulse current compared to the 4.8A of the main part, representing a 1.9% reduction within acceptable tolerance for transient voltage suppression applications. Both maintain 600W peak pulse power, 78V reverse standoff voltage, and 126V clamping voltage. All other electrical and mechanical parameters align with the primary part.

Q: Do all substitute parts use the same DO-214AA/SMB package?

A: Yes. All listed substitute parts use DO-214AA/SMB surface mount packaging, ensuring mechanical and electrical compatibility with existing PCB designs and assembly processes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance certification, meeting current environmental and regulatory standards for electronic component manufacturing and use.

Q: Which substitute part offers the widest operating temperature range?

A: SMBJ78A-TP (Micro Commercial Co) specifies an operating temperature range of -55 to 175°C, extending 25°C above the primary part's upper limit of 150°C. This part is suitable for applications requiring enhanced thermal performance.

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