SMBJ78A-M3/52 Equivalent & Substitute Parts

Part Overview

The SMBJ78A-M3/52 is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. Manufactured in the DO-214AA (SMB) package, this component operates across a temperature range of -55°C to 150°C and maintains active product status with full RoHS3 compliance. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational specifications to ensure direct circuit-level interchangeability.

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
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ78A-M3/52 are qualified based on the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 78V
Voltage - Breakdown (Min): 86.7V minimum
Voltage - Clamping (Max) @ Ipp: 126V maximum
Current - Peak Pulse (10/1000µs): 4.7A to 4.86A
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Parts meeting these criteria are electrically and mechanically interchangeable at the circuit level. Variations in peak pulse current within the specified range (4.7A to 4.86A) and clamping voltage within tolerance do not affect functional substitution.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	RoHS Status
SMBJ78A-M3/52	Vishay General Semiconductor	78	86.7	126	4.8	600	-55 to 150	DO-214AA (SMBJ)	ROHS3 Compliant
SMBJ78D-M3/H	Vishay General Semiconductor	78	88.1	124	4.86	600	-55 to 150	DO-214AA (SMBJ)	ROHS3 Compliant
SMBJ78A-E3/52	Vishay General Semiconductor	78	86.7	126	4.8	600	-55 to 150	DO-214AA (SMBJ)	ROHS3 Compliant
SMBJ78A	MDD	78	86.7	126	4.8	600	-50 to 150	SMB/DO-214AA	ROHS3 Compliant
SMBJ78A-13-F	Diodes Incorporated	78	86.7	126	4.7	600	-55 to 150	SMB/DO-214AA	ROHS3 Compliant
SMBJ78A-TP	Micro Commercial Co	78	86.7	126	4.7	600	-55 to 175	DO-214AA (SMB)	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed maintain active product status and full RoHS3 compliance, meeting regulatory requirements for industrial and commercial applications. Selection among qualified substitutes should be based on:

Inventory availability and lead time requirements
Manufacturer preference or supply chain constraints
Operating temperature range requirements (note: SMBJ78A from MDD operates to -50°C minimum versus -55°C for other options; SMBJ78A-TP from Micro Commercial Co extends to 175°C maximum)
Packaging variant preference (DO-214AA versus SMB designation)

The SMBJ78A-E3/52 from Vishay General Semiconductor is the manufacturer-recommended equivalent, offering identical electrical specifications to the primary part with significantly higher inventory availability (45,100 units in stock).

Frequently Asked Questions (FAQ)

Q: Can SMBJ78D-M3/H be used as a direct replacement for SMBJ78A-M3/52?

A: Yes. Both parts share identical reverse standoff voltage (78V), peak pulse power (600W), operating temperature range (-55°C to 150°C), and package type (DO-214AA). The clamping voltage difference (124V versus 126V) and peak pulse current variation (4.86A versus 4.8A) fall within acceptable substitution tolerances for general-purpose TVS applications.

Q: What is the difference between SMBJ78A from MDD and SMBJ78A-M3/52 from Vishay?

A: Both parts are electrically identical with matching voltage ratings and peak pulse specifications. The primary difference is the minimum operating temperature: MDD variant operates to -50°C while the Vishay part operates to -55°C. For applications requiring operation below -50°C, the Vishay part is required.

Q: Is SMBJ78A-TP compatible with the original part?

A: Yes. SMBJ78A-TP from Micro Commercial Co meets all electrical substitution criteria. It offers an extended maximum operating temperature of 175°C compared to 150°C for the original part, making it suitable for higher-temperature environments while maintaining full backward compatibility.

Q: Why are there multiple part numbers for the same electrical specifications?

A: Different manufacturers and packaging variants (tape & reel designations, suffix codes) represent the same base product (SMBJ78) with identical electrical performance. These variations reflect manufacturing source, packaging configuration, and supply chain options rather than functional differences.

Q: Can I substitute based on package type alone?

A: No. While all listed substitutes use DO-214AA or SMB packages, electrical parameters must also match. Package compatibility is necessary but not sufficient for substitution. Verify that voltage ratings, current ratings, and temperature ranges meet circuit requirements.

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