SMBJ45A-HRA Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMBJ45A-HRA is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional zener diode operates with a 45V reverse standoff voltage and provides 72.7V maximum clamping voltage at peak pulse current. The component is RoHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1), making it suitable for standard manufacturing environments. 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	-65 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-HRA are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 45V
Voltage - Breakdown (Min): 50V
Voltage - Clamping (Max) @ Ipp: 72.7V
Current - Peak Pulse (10/1000µs): 8.3A
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All identified substitute parts maintain identical electrical performance specifications and package compatibility. Variations in operating temperature range and packaging format (Tape & Reel vs. Cut Tape) do not affect functional substitution capability.

Parameter Comparison

Parameter	SMBJ45A-HRA (Littelfuse)	SMBJ45A (MDD)	SMBJ45A-13-F (Diodes Inc.)	SMBJ45A-E3/52 (Vishay)
Voltage - Reverse Standoff (Typ)	45V	45V	45V	45V
Voltage - Breakdown (Min)	50V	50V	50V	50V
Voltage - Clamping (Max) @ Ipp	72.7V	72.7V	72.7V	72.7V
Current - Peak Pulse (10/1000µs)	8.3A	8.3A	8.3A	8.3A
Power - Peak Pulse	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-50 to 150°C	-55 to 150°C	-55 to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed maintain active product status and full RoHS3 compliance. Selection among SMBJ45A (MDD), SMBJ45A-13-F (Diodes Incorporated), and SMBJ45A-E3/52 (Vishay General Semiconductor) is determined by availability, packaging format requirements, and operating temperature margin needs.

The SMBJ45A-HRA offers the widest operating temperature range (-65 to 150°C), providing maximum thermal margin. The SMBJ45A-13-F and SMBJ45A-E3/52 both support -55 to 150°C operation, suitable for standard industrial applications. The SMBJ45A (MDD) operates from -50 to 150°C, acceptable for applications not requiring extended low-temperature performance.

Packaging format differences (Tape & Reel vs. Cut Tape) reflect supply chain and manufacturing process preferences and do not affect electrical performance or mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can SMBJ45A-13-F replace SMBJ45A-HRA in existing designs?

A: Yes. Both components share identical electrical specifications (45V standoff, 72.7V clamping, 8.3A peak pulse current, 600W peak power) and are packaged in DO-214AA/SMB surface-mount format. The operating temperature range difference (-55 to 150°C vs. -65 to 150°C) does not affect substitution in applications operating within -55°C minimum.

Q: What is the difference between SMBJ45A and SMBJ45A-HRA?

A: The primary difference is the operating temperature range. SMBJ45A (MDD) operates from -50 to 150°C, while SMBJ45A-HRA (Littelfuse) operates from -65 to 150°C. All other electrical and mechanical parameters are identical. Selection depends on whether the application requires extended low-temperature performance below -50°C.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed parts use the DO-214AA/SMB package and surface-mount configuration, ensuring identical PCB footprint compatibility. No layout modifications are required for substitution.

Q: Does packaging format (Tape & Reel vs. Cut Tape) affect performance?

A: No. Packaging format reflects supply and manufacturing logistics only. Electrical performance and mechanical specifications remain identical regardless of whether the component is supplied in Tape & Reel (TR) or Cut Tape (CT) format.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status and maintain unlimited moisture sensitivity rating (MSL 1), meeting standard environmental and manufacturing requirements.

Q: What determines whether a part qualifies as a substitute for SMBJ45A-HRA?

A: Substitution is based on matching the following parameters: 45V reverse standoff voltage, 50V minimum breakdown voltage, 72.7V maximum clamping voltage at peak pulse current, 8.3A peak pulse current, 600W peak pulse power, DO-214AA/SMB package, surface-mount configuration, RoHS3 compliance, and MSL 1 rating. Operating temperature range variations do not disqualify substitution.

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