SMBJ45A-M3/52 Equivalent & Substitute Parts

Part Overview

The SMBJ45A-M3/52 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 45V reverse standoff category and is designed for general-purpose transient voltage suppression applications. The part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AA (SMB) package family.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	45	V
Voltage - Breakdown (Min)	50	V
Voltage - Clamping (Max) @ Ipp	72.7	V
Current - Peak Pulse (10/1000µs)	8.3	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ45A-M3/52 are grouped based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 45V
Voltage - Breakdown (Min): 50V minimum
Voltage - Clamping (Max) @ Ipp: 72.7V (±tolerance acceptable)
Current - Peak Pulse (10/1000µs): 8.3A (±tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Unidirectional Channels: 1

Grouping Logic:

Group 1 - Direct Electrical & Mechanical Equivalents: Parts matching all primary criteria with identical clamping voltage (72.7V) and peak pulse current (8.3A).

Group 2 - Functional Equivalents with Minor Parameter Variance: Parts meeting core voltage and current specifications with acceptable deviations in clamping voltage or peak pulse characteristics while maintaining the same package and mounting type.

Group 3 - Conditional Substitutes: Parts meeting electrical specifications but with compliance or temperature range differences requiring application-level verification.

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	Package	RoHS Status
SMBJ45A-M3/52	Vishay	45V	50V	72.7V	8.3A	600W	-55 to 150°C	DO-214AA, SMB	ROHS3
SMBJ45D-M3/H	Vishay	45V	50.8V	71.6V	8.4A	600W	-55 to 150°C	DO-214AA, SMB	ROHS3
SMBJ45A-E3/52	Vishay	45V	50V	72.7V	8.3A	600W	-55 to 150°C	DO-214AA, SMB	ROHS3
SMBJ45A	MDD	45V	50V	72.7V	8.3A	600W	-50 to 150°C	DO-214AA, SMB	ROHS3
SMBJ45A-13-F	Diodes Incorporated	45V	50V	72.7V	8.3A	600W	-55 to 150°C	DO-214AA, SMB	ROHS3
1SMB45A TR13	Central Semiconductor Corp	45V	50V	72.7V	8.3A	600W	-65 to 150°C	DO-214AA, SMB	RoHS non-compliant
SACB45	Littelfuse Inc.	45V	50V	77V	6.8A	500W	-55 to 150°C	DO-214AA, SMB	ROHS3

Engineering Selection Recommendations

Preferred Substitutes (Direct Equivalents):

SMBJ45A-E3/52 (Vishay) and SMBJ45A-13-F (Diodes Incorporated) are direct electrical and mechanical equivalents to the SMBJ45A-M3/52. Both parts match all primary specifications including 45V reverse standoff, 50V minimum breakdown voltage, 72.7V clamping voltage, and 8.3A peak pulse current. Both are ROHS3 compliant with identical operating temperature ranges (-55 to 150°C). These parts are suitable for direct substitution without circuit redesign.

Alternative Substitutes (Functional Equivalents):

SMBJ45D-M3/H (Vishay) provides functional equivalence with minor parameter variance. The clamping voltage is 71.6V (1.1V lower) and peak pulse current is 8.4A (0.1A higher), with identical 600W peak pulse power rating. This part maintains ROHS3 compliance and the full -55 to 150°C operating temperature range. Selection depends on application tolerance for clamping voltage variation.

SMBJ45A (MDD) matches all electrical specifications but operates over a narrower temperature range (-50 to 150°C versus -55 to 150°C). This part is suitable for applications not requiring the extended low-temperature performance of the original part.

Conditional Substitutes:

1SMB45A TR13 (Central Semiconductor Corp) meets all electrical specifications but is RoHS non-compliant. This part is suitable only for applications where RoHS compliance is not required. The extended operating temperature range (-65 to 150°C) provides additional low-temperature capability.

SACB45 (Littelfuse Inc.) differs in clamping voltage (77V versus 72.7V) and peak pulse current (6.8A versus 8.3A), with reduced peak pulse power (500W versus 600W). This part is not recommended as a direct substitute due to electrical parameter differences.

Frequently Asked Questions (FAQ)

Q: Can SMBJ45A-E3/52 replace SMBJ45A-M3/52 directly?

A: Yes. SMBJ45A-E3/52 is a direct equivalent with identical electrical specifications (45V reverse standoff, 72.7V clamping voltage, 8.3A peak pulse current) and package (DO-214AA, SMB). Both are ROHS3 compliant with matching operating temperature ranges. The primary difference is packaging format (Cut Tape versus Tape & Reel), which does not affect electrical performance.

Q: What is the difference between SMBJ45D-M3/H and SMBJ45A-M3/52?

A: Both parts share the same 45V reverse standoff voltage and 600W peak pulse power rating. SMBJ45D-M3/H has a slightly lower clamping voltage (71.6V versus 72.7V) and marginally higher peak pulse current (8.4A versus 8.3A). These differences are within typical manufacturing tolerances for the 45V TVS diode category. Selection depends on whether the application can tolerate the 1.1V clamping voltage reduction.

Q: Is 1SMB45A TR13 suitable for RoHS-compliant applications?

A: No. 1SMB45A TR13 is marked as RoHS non-compliant. If RoHS3 compliance is required, use SMBJ45A-E3/52, SMBJ45A-13-F, or SMBJ45D-M3/H instead.

Q: Can SACB45 be used as a substitute?

A: SACB45 is not recommended as a direct substitute. While it maintains the 45V reverse standoff voltage, it differs in clamping voltage (77V versus 72.7V) and peak pulse current (6.8A versus 8.3A), with reduced peak pulse power (500W versus 600W). These electrical differences may affect circuit protection performance.

Q: What packaging options are available for equivalent parts?

A: All equivalent and substitute parts use the DO-214AA (SMB) surface mount package. Packaging format variations include Tape & Reel (TR) and Cut Tape (CT), which affect handling and assembly but not electrical performance. Select based on your procurement and assembly process requirements.

Q: Does operating temperature range affect substitution?

A: Operating temperature range differences should be evaluated against application requirements. SMBJ45A-M3/52 operates from -55 to 150°C. MDD's SMBJ45A variant operates from -50 to 150°C (5°C narrower at the low end). 1SMB45A TR13 extends to -65°C. Select based on your circuit's minimum operating temperature requirement.

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