SMBJ8.5A-HRA Equivalent & Substitute Parts

Part Overview

The SMBJ8.5A-HRA is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection in surface-mount applications. This component features an 8.5V reverse standoff voltage with a 14.4V maximum clamping voltage and 41.7A peak pulse current capability in a DO-214AA (SMB) package. The part is Active status and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the SMBJ series.

Substiute Parts

SMBJ8.5A-HRA

LittelfuseIn Stock: 856SMBJ8.5A-HRA Datasheet

Current PartRFQ

SMBJ8.5A

Taiwan Semiconductor CorporationIn Stock: 44396SMBJ8.5A Datasheet

DirectRFQ

SMBJ8.5A-13-F

Diodes IncorporatedIn Stock: 4313SMBJ8.5A-13-F Datasheet

DirectRFQ

SMBJ8.5A-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 1970SMBJ8.5A-E3/52 Datasheet

DirectRFQ

SMBJ8V5A

Fairchild SemiconductorIn Stock: 35175SMBJ8V5A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMBJ8.5A-HRA are qualified based on the following critical parameters:

• Voltage - Reverse Standoff (Typ): 8.5V
• Voltage - Clamping (Max) @ Ipp: 14.4V
• Current - Peak Pulse (10/1000µs): 41.7A or higher
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA or SMB
• Mounting Type: Surface Mount
• Type: Zener
• Unidirectional Channels: 1

All identified substitutes maintain these core electrical specifications and mechanical compatibility. Variations in peak pulse current (41.7A to 43A) and operating temperature ranges are within acceptable tolerance for general-purpose TVS applications.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and ROHS3 compliance, meeting current regulatory requirements. The SMBJ8.5A from Taiwan Semiconductor Corporation offers the highest peak pulse current specification at 43A, providing additional margin in transient protection applications. The Littelfuse SMBJ8.5A-HRA maintains the widest operating temperature range (-65°C to 150°C), suitable for extended temperature environments. Vishay's SMBJ8.5A-E3/52 and Diodes Incorporated's SMBJ8.5A-13-F are functionally equivalent with identical electrical parameters. Selection should be based on availability, supply chain requirements, and specific application temperature constraints.

Frequently Asked Questions (FAQ)

Q: Can SMBJ8.5A from Taiwan Semiconductor Corporation be used as a direct replacement for SMBJ8.5A-HRA?

A: Yes. Both parts share identical voltage specifications (8.5V reverse standoff, 14.4V clamping), equivalent power ratings (600W), and compatible DO-214AA/SMB packaging. The Taiwan Semiconductor part delivers 43A peak pulse current compared to 41.7A, providing equivalent or superior performance. Operating temperature range differs (-55°C to 150°C versus -65°C to 150°C); verify application requirements for low-temperature operation below -55°C.

Q: What is the difference between SMBJ8.5A-E3/52 and SMBJ8.5A-13-F?

A: Both parts are functionally equivalent with identical electrical parameters: 8.5V reverse standoff, 14.4V clamping voltage, and 41.7A peak pulse current. The primary differences are manufacturer (Vishay versus Diodes Incorporated) and packaging designation (E3/52 versus 13-F). Both are RoHS3 compliant and suitable for general-purpose TVS applications.

Q: Is SMBJ8V5A compatible with SMBJ8.5A-HRA?

A: Yes. SMBJ8V5A from Fairchild Semiconductor is electrically equivalent with matching 8.5V reverse standoff, 14.4V clamping voltage, 41.7A peak pulse current, and 600W power rating. Both use DO-214AA/SMB surface-mount packaging. The primary consideration is operating temperature range (-55°C to 150°C for SMBJ8V5A versus -65°C to 150°C for SMBJ8.5A-HRA).

Q: Are all substitute parts available in the same packaging?

A: All substitute parts use DO-214AA or SMB package designations, ensuring mechanical and electrical compatibility in surface-mount applications. Packaging variations (Tape & Reel versus Bulk) affect supply and handling but do not impact functional performance or PCB mounting compatibility.

Q: What parameters must remain constant when selecting a substitute TVS diode?

A: Critical parameters for substitution are reverse standoff voltage (8.5V), clamping voltage (14.4V), peak pulse current capability (minimum 41.7A), power rating (600W), package type (DO-214AA/SMB), and mounting method (surface mount). All listed substitutes maintain these specifications within acceptable engineering tolerances.