SMBJ48A-HRA Equivalent & Substitute Parts

Part Overview

The SMBJ48A-HRA is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 48V reverse standoff voltage with a 77.4V maximum clamping voltage and 7.8A peak pulse current capability in a DO-214AA (SMB) package. The part maintains Active product status and is RoHS3 compliant with MSL Level 1 rating. Substitute parts are identified to address inventory availability, alternative sourcing requirements, or packaging format preferences while maintaining electrical and mechanical compatibility.

Substiute Parts

SMBJ48A-HRA

Littelfuse Inc.In Stock: 797SMBJ48A-HRA Datasheet

Current PartRFQ

SMBJ48A

MeritekIn Stock: 77463SMBJ48A Datasheet

DirectRFQ

SMBJ48A

MeritekIn Stock: 77463SMBJ48A Datasheet

DirectRFQ

SMBJ48A-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 20164SMBJ48A-E3/52 Datasheet

DirectRFQ

SMBJ48A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 3880SMBJ48A-E3/5B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMBJ48A-HRA are qualified based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 48V
• Voltage - Breakdown (Min): 53.3V
• Voltage - Clamping (Max) @ Ipp: 77.4V
• Current - Peak Pulse (10/1000µs): 7.75A to 7.8A
• Power - Peak Pulse: 600W
• Type: Zener, Unidirectional

Mechanical Compatibility Criteria:

• Package / Case: DO-214AA (SMB)
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)
• REACH Status: REACH Unaffected

Substitute parts maintain identical or equivalent electrical performance within the specified parameter ranges. Packaging format variations (Tape & Reel, Cut Tape, Digi-Reel) do not affect functional compatibility and are selected based on procurement and assembly requirements.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain Active product status and full RoHS3 compliance with MSL Level 1 rating, ensuring regulatory and environmental compatibility with the original SMBJ48A-HRA specification.

SMBJ48A (Meritek): Functionally equivalent with 7.75A peak pulse current (within acceptable tolerance of the 7.8A specification). Operating temperature range is -55 to 150°C, which is narrower than the original -65 to 150°C range. This part is suitable for applications where the lower temperature limit of -55°C is acceptable.

SMBJ48A-E3/52 (Vishay TransZorb®): Exact electrical match with 7.8A peak pulse current and identical clamping characteristics. Operating temperature range is -55 to 150°C. Available in Cut Tape and Digi-Reel® packaging formats. Suitable for high-volume automated assembly processes.

SMBJ48A-E3/5B (Vishay TransZorb®): Exact electrical match with 7.8A peak pulse current and identical clamping characteristics. Operating temperature range is -55 to 150°C. Available in Tape & Reel packaging, matching the original format. Recommended for direct replacement in existing supply chains.

Selection between substitute parts should be based on packaging format requirements, inventory availability, and temperature range specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can SMBJ48A (Meritek) be used as a direct replacement for SMBJ48A-HRA?

A: Yes, with consideration for operating temperature range. The Meritek part meets all critical electrical parameters (48V standoff, 77.4V clamping, 7.75A peak pulse) and maintains identical package and compliance specifications. However, its operating temperature range (-55 to 150°C) is narrower than the original (-65 to 150°C). Verify that your application does not require operation below -55°C.

Q: What is the difference between the Vishay SMBJ48A-E3/52 and SMBJ48A-E3/5B variants?

A: Both Vishay parts are electrically identical with 7.8A peak pulse current and -55 to 150°C operating temperature. The primary difference is packaging format: SMBJ48A-E3/52 is supplied in Cut Tape and Digi-Reel® formats, while SMBJ48A-E3/5B is supplied in Tape & Reel format. Select based on your assembly equipment and procurement requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (SMBJ48A from Meritek, SMBJ48A-E3/52 and SMBJ48A-E3/5B from Vishay) are RoHS3 compliant with MSL Level 1 rating, matching the original SMBJ48A-HRA specification.

Q: Does the DO-214AA package differ between manufacturers?

A: No. The DO-214AA (SMB) package is a standardized surface-mount package. All parts listed use this identical package specification, ensuring mechanical and electrical compatibility on PCB layouts.

Q: What is the significance of the 7.75A vs. 7.8A peak pulse current difference?

A: The Meritek SMBJ48A specifies 7.75A peak pulse current compared to 7.8A for the original and other substitutes. This 0.05A difference (0.64% variance) is within normal manufacturing tolerance for TVS diodes and does not affect functional compatibility in general-purpose overvoltage protection applications.

Q: Can I mix different manufacturers' parts in the same circuit board assembly?

A: Yes. All substitute parts meet identical electrical specifications for the critical parameters (voltage standoff, breakdown, clamping, and peak pulse current) and use the same DO-214AA package. Mixing manufacturers is acceptable from an electrical and mechanical standpoint, though single-source procurement is often preferred for supply chain consistency.