SMBJ45A-E3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ45A-E3/5B 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 protection applications. The part is currently active in production with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). 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-E3/5B are grouped based on the following critical electrical and mechanical parameters:

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

Parts meeting these criteria are direct electrical equivalents. Parts with variations in clamping voltage, peak pulse current, or power rating are listed as functional alternatives with noted parameter differences. All substitute parts maintain the same reverse standoff voltage (45V) and breakdown voltage minimum (50V) to ensure circuit protection performance.

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
SMBJ45A-E3/5B	Vishay General Semiconductor - Diodes Division	45V	50V	72.7V	8.3A	600W	-55 to 150°C	ROHS3 Compliant
SMBJ45D-M3/I	Vishay General Semiconductor - Diodes Division	45V	50.8V	71.6V	8.4A	600W	-55 to 150°C	ROHS3 Compliant
SMBJ45A-13-F	Diodes Incorporated	45V	50V	72.7V	8.3A	600W	-55 to 150°C	ROHS3 Compliant
1SMB45A TR13	Central Semiconductor Corp	45V	50V	72.7V	8.3A	600W	-65 to 150°C	RoHS non-compliant
SACB45	Littelfuse Inc.	45V	50V	77V	6.8A	500W	-55 to 150°C	ROHS3 Compliant
SMBJ45A	MDD	45V	50V	72.7V	8.3A	600W	-50 to 150°C	ROHS3 Compliant
SMBJ48A-TR	STMicroelectronics	48V	53.3V	77.4V	8.1A	600W	-55 to 150°C	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical Performance)

SMBJ45A-13-F (Diodes Incorporated) and SMBJ45A (MDD) are direct electrical equivalents to the SMBJ45A-E3/5B. Both maintain identical reverse standoff voltage (45V), breakdown voltage (50V), clamping voltage (72.7V), and peak pulse current (8.3A). All three parts are RoHS3 compliant and rated for -55°C to 150°C operating temperature (with SMBJ45A rated to -50°C minimum). These parts are interchangeable for circuit protection applications requiring 45V standoff performance.

High-Compatibility Substitute (Vishay Manufacturer)

SMBJ45D-M3/I (Vishay General Semiconductor - Diodes Division) is a variant within the same manufacturer's product line. It maintains the 45V reverse standoff and 50.8V breakdown voltage with marginally lower clamping voltage (71.6V vs. 72.7V) and slightly higher peak pulse current (8.4A vs. 8.3A). This part is RoHS3 compliant and operates across the same temperature range (-55°C to 150°C). The parameter variations are within typical device tolerance ranges for TVS diodes.

Functional Alternative with Parameter Variations

SACB45 (Littelfuse Inc.) maintains the 45V reverse standoff and 50V breakdown voltage but exhibits higher clamping voltage (77V) and lower peak pulse current (6.8A) with reduced peak pulse power (500W vs. 600W). This part is suitable for applications where slightly higher clamping voltage is acceptable and peak pulse current requirements are lower. RoHS3 compliance is maintained.

Non-Compliant Alternative

1SMB45A TR13 (Central Semiconductor Corp) provides identical electrical performance to the SMBJ45A-E3/5B (45V standoff, 50V breakdown, 72.7V clamping, 8.3A peak pulse current) but is RoHS non-compliant. This part is suitable only for applications where RoHS compliance is not required. Operating temperature range extends to -65°C minimum.

Higher Voltage Rating Alternative

SMBJ48A-TR (STMicroelectronics) operates at 48V reverse standoff with 53.3V breakdown voltage, representing a higher voltage rating category. Clamping voltage is 77.4V with 8.1A peak pulse current. This part is not a direct substitute but may be considered for circuits requiring higher voltage protection margins. RoHS3 compliance is maintained.

Frequently Asked Questions (FAQ)

Q: Can SMBJ45A-13-F replace SMBJ45A-E3/5B directly?

A: Yes. SMBJ45A-13-F (Diodes Incorporated) is a direct electrical equivalent with identical reverse standoff voltage (45V), breakdown voltage (50V), clamping voltage (72.7V), and peak pulse current (8.3A). Both are RoHS3 compliant and rated for surface mount DO-214AA/SMB packages. No circuit modifications are required.

Q: What is the difference between SMBJ45D-M3/I and SMBJ45A-E3/5B?

A: SMBJ45D-M3/I is a Vishay variant with marginally different electrical characteristics: clamping voltage is 71.6V (vs. 72.7V) and peak pulse current is 8.4A (vs. 8.3A). Both maintain 45V reverse standoff and 50V minimum breakdown voltage. These variations fall within typical TVS diode tolerance ranges and do not affect circuit protection function.

Q: Is SACB45 a suitable replacement?

A: SACB45 (Littelfuse Inc.) maintains the same 45V reverse standoff and 50V breakdown voltage but has higher clamping voltage (77V) and lower peak pulse current (6.8A) with reduced power rating (500W vs. 600W). It is suitable for applications where these parameter variations are acceptable. Verify that the higher clamping voltage does not exceed downstream component voltage ratings.

Q: Why is 1SMB45A TR13 marked as RoHS non-compliant?

A: 1SMB45A TR13 (Central Semiconductor Corp) does not meet RoHS3 compliance requirements. Use this part only in applications or regions where RoHS compliance is not mandated. It provides identical electrical performance to SMBJ45A-E3/5B.

Q: Can SMBJ48A-TR be used instead of SMBJ45A-E3/5B?

A: SMBJ48A-TR operates at a higher voltage rating (48V reverse standoff vs. 45V) with higher clamping voltage (77.4V vs. 72.7V). It is not a direct substitute but may be used in circuits where higher voltage protection margins are required. Verify that the higher clamping voltage is compatible with downstream components.

Q: What package compatibility should I verify?

A: All listed substitute parts use DO-214AA or SMB surface mount packages. Verify that your PCB footprint accommodates the SMB/DO-214AA package. SMBJ45A (MDD) is available in SMB/DO-214AA configuration. Confirm supplier device package designation before procurement.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Most substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® packaging suitable for automated assembly. SMBJ45A (MDD) packaging designation is not specified in available data. Confirm packaging availability with your supplier before design finalization.

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