SMBJ58A-HR Equivalent & Substitute Parts

Part Overview

The SMBJ58A-HR is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This surface-mount component operates with a 58V reverse standoff voltage and provides 93.6V maximum clamping voltage at peak pulse current. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range.

Substiute Parts

SMBJ58A-HR

Littelfuse Inc.In Stock: 884SMBJ58A-HR Datasheet

Current PartRFQ

SMBJ58A

MeritekIn Stock: 17454SMBJ58A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ58A-HR is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 58V
• Voltage - Breakdown (Min): 64.4V
• Voltage - Clamping (Max) @ Ipp: 93.6V
• Current - Peak Pulse (10/1000µs): within acceptable tolerance
• Power - Peak Pulse: 600W minimum
• Package / Case: DO-214AA (SMB) surface mount
• Type: Zener unidirectional TVS diode
• Unidirectional Channels: 1

The SMBJ58A manufactured by Meritek meets these substitution criteria with equivalent electrical ratings and identical mechanical packaging, enabling direct replacement in general-purpose transient voltage suppression applications.

Parameter Comparison

Engineering Selection Recommendations

Both the SMBJ58A-HR (Littelfuse) and SMBJ58A (Meritek) are active production components with full RoHS3 compliance and REACH unaffected status. Selection between these parts should be based on the following criteria:

The SMBJ58A-HR maintains a wider operating temperature range (-65 to 150°C) compared to the Meritek substitute (-55 to 150°C). Applications requiring operation below -55°C must use the Littelfuse part. For applications within the -55 to 150°C range, both parts deliver equivalent electrical performance with peak pulse current ratings within acceptable tolerance (6.5A vs. 6.41A). Both components are packaged identically in DO-214AA (SMB) surface-mount format and are suitable for direct PCB substitution. Compliance certifications are equivalent across both manufacturers.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ58A (Meritek) directly replace the SMBJ58A-HR (Littelfuse) in all applications?

A: Direct replacement is possible for applications operating within the -55 to 150°C temperature range. Applications requiring operation below -55°C must retain the Littelfuse SMBJ58A-HR due to its extended lower temperature limit of -65°C.

Q: Are the electrical ratings identical between these two parts?

A: Electrical ratings are equivalent. Both parts specify 58V reverse standoff voltage, 93.6V maximum clamping voltage, and 600W peak pulse power. Peak pulse current differs marginally (6.5A vs. 6.41A), which is within acceptable tolerance for general-purpose TVS applications.

Q: Is the package format identical?

A: Yes. Both parts use the DO-214AA (SMB) surface-mount package, enabling identical PCB footprints and reflow soldering processes.

Q: Do both parts meet the same compliance standards?

A: Both parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings. Compliance certifications are equivalent.

Q: What is the primary difference between these substitute parts?

A: The primary difference is the operating temperature range. The Littelfuse part extends to -65°C, while the Meritek part operates from -55°C. For applications within standard industrial temperature ranges, this difference is typically not a limiting factor.