SMBJ45A-Q Equivalent & Substitute Parts

Part Overview

The SMBJ45A-Q is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., designed for telecom applications. This surface mount component operates in the 45V reverse standoff voltage class with a 72.7V maximum clamping voltage and 8.3A peak pulse current rating. The part is actively produced, AEC-Q101 qualified for automotive applications, and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AA (SMB) package format.

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
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55 to 150	°C (TJ)

Substitute Part Grouping Explanation

Substitute parts for the SMBJ45A-Q are qualified based on the following electrical and mechanical criteria:

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

Parts meeting these criteria are mechanically and electrically interchangeable. Variations in clamping voltage (within the specified range) and peak pulse current (at or above specification) do not affect circuit compatibility when the reverse standoff voltage and breakdown voltage remain constant.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	RoHS Status	Product Status
SMBJ45A-Q	Bourns Inc.	45V	50V	72.7V	8.3A	600W	-55 to 150°C	RoHS3 Compliant	Active
1SMB45A TR13	Central Semiconductor Corp	45V	50V	72.7V	8.3A	600W	-65 to 150°C	RoHS non-compliant	Active
SACB45	Littelfuse Inc.	45V	50V	77V	6.8A	500W	-55 to 150°C	RoHS3 Compliant	Active
SMBJ45A	MDD	45V	50V	72.7V	8.3A	600W	-50 to 150°C	RoHS3 Compliant	Active
SMBJ45A-13-F	Diodes Incorporated	45V	50V	72.7V	8.3A	600W	-55 to 150°C	RoHS3 Compliant	Active
SMBJ45A-E3/52	Vishay General Semiconductor - Diodes Division	45V	50V	72.7V	8.3A	600W	-55 to 150°C	RoHS3 Compliant	Active
SMBJ45D-M3/H	Vishay General Semiconductor - Diodes Division	45V	50.8V	71.6V	8.4A	600W	-55 to 150°C	RoHS3 Compliant	Active
SMBJ45D-M3/I	Vishay General Semiconductor - Diodes Division	45V	50.8V	71.6V	8.4A	600W	-55 to 150°C	RoHS3 Compliant	Active

Engineering Selection Recommendations

All substitute parts listed are actively produced and meet the core electrical specifications for direct replacement of the SMBJ45A-Q. Selection criteria are based on compliance status and product availability:

Direct Equivalents (Identical Electrical Performance): SMBJ45A-13-F, SMBJ45A-E3/52, and SMBJ45A (MDD) provide identical clamping voltage (72.7V) and peak pulse current (8.3A) ratings. All three are RoHS3 compliant and actively produced. SMBJ45A-13-F and SMBJ45A-E3/52 maintain the -55 to 150°C operating temperature range of the original part.

Compatible Alternatives (Equivalent Performance Within Specification): SMBJ45D-M3/H and SMBJ45D-M3/I offer slightly lower clamping voltage (71.6V) and marginally higher peak pulse current (8.4A), both within acceptable substitution parameters. These parts are RoHS3 compliant and actively produced.

Conditional Substitutes: 1SMB45A TR13 matches electrical specifications but is RoHS non-compliant and operates at an extended lower temperature limit (-65°C). Use only where RoHS compliance is not required.

SACB45 (Littelfuse) has a higher clamping voltage (77V) and lower peak pulse current (6.8A). This part is suitable only for applications where the higher clamping voltage is acceptable and the reduced current rating does not exceed circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can SMBJ45A-Q be replaced with SMBJ45A (MDD)? A: Yes. Both parts share identical electrical specifications (45V standoff, 50V breakdown, 72.7V clamping, 8.3A peak pulse current) and the same DO-214AA SMB package. Both are RoHS3 compliant and actively produced.

Q: What is the difference between SMBJ45A-13-F and SMBJ45A-E3/52? A: Both parts have identical electrical ratings and are manufactured by different suppliers (Diodes Incorporated and Vishay, respectively). The difference is packaging format: SMBJ45A-13-F is supplied in Tape & Reel, while SMBJ45A-E3/52 is supplied in Cut Tape. Electrical performance is equivalent.

Q: Can SACB45 replace SMBJ45A-Q? A: SACB45 is electrically compatible for the 45V reverse standoff voltage class but has a higher clamping voltage (77V vs. 72.7V) and lower peak pulse current (6.8A vs. 8.3A). Use only if the application tolerates higher clamping voltage and does not require the full 8.3A current rating.

Q: Is 1SMB45A TR13 a suitable replacement? A: 1SMB45A TR13 matches all electrical specifications but is RoHS non-compliant. It is suitable only for applications where RoHS compliance is not a requirement. The extended operating temperature range (-65 to 150°C) provides additional margin in low-temperature environments.

Q: What is the significance of the SMBJ45D variants? A: SMBJ45D-M3/H and SMBJ45D-M3/I are functionally equivalent alternatives with marginally different electrical characteristics: 71.6V clamping voltage (vs. 72.7V) and 8.4A peak pulse current (vs. 8.3A). These differences fall within acceptable substitution tolerances for the 45V voltage class.

Q: Are all substitute parts available in the same package? A: All substitute parts use the DO-214AA (SMB) surface mount package. Packaging formats (Tape & Reel, Cut Tape) vary by supplier but do not affect electrical compatibility or PCB mounting.

Q: Which substitute offers the best compliance profile? A: SMBJ45A-13-F, SMBJ45A-E3/52, SMBJ45A (MDD), SMBJ45D-M3/H, and SMBJ45D-M3/I are all RoHS3 compliant and actively produced. Selection should be based on availability, packaging preference, and lead time requirements.

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