SMBJ64A-HRA Equivalent & Substitute Parts

Part Overview

The SMBJ64A-HRA 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 64V reverse standoff voltage and provides 103V 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

SMBJ64A-HRA

Littelfuse Inc.In Stock: 1073SMBJ64A-HRA Datasheet

Current PartRFQ

SMBJ64A

MeritekIn Stock: 23111SMBJ64A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ64A-HRA is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 64V nominal
• Voltage - Breakdown (Min): 71.1V minimum
• Voltage - Clamping (Max) @ Ipp: 103V maximum
• Package / Case: DO-214AA (SMB) surface mount
• Type: Zener unidirectional TVS diode
• RoHS3 Compliance: Required

The SMBJ64A manufactured by Meritek meets all substitution criteria. Peak pulse current tolerance (5.83A vs. 5.9A) and operating temperature range variation (-55°C minimum vs. -65°C minimum) remain within acceptable substitution parameters for general-purpose TVS applications where the specified electrical characteristics are maintained.

Parameter Comparison

Engineering Selection Recommendations

Both the SMBJ64A-HRA (Littelfuse Inc.) and SMBJ64A (Meritek) are active production components with full RoHS3 compliance and REACH unaffected status. Selection between these parts is based on availability, supply chain requirements, and application-specific temperature operating conditions. The Littelfuse variant supports extended low-temperature operation to -65°C, while the Meritek variant operates from -55°C minimum. Both maintain identical voltage suppression characteristics and package compatibility for DO-214AA (SMB) surface-mount applications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ64A (Meritek) directly replace SMBJ64A-HRA (Littelfuse) in existing designs?

A: Yes, for applications operating within the -55°C to 150°C temperature range. Both parts maintain identical reverse standoff voltage (64V), breakdown voltage (71.1V minimum), and clamping voltage (103V maximum) specifications. The 0.07A difference in peak pulse current (5.83A vs. 5.9A) is within acceptable tolerance for general-purpose TVS applications.

Q: What is the significance of the DO-214AA (SMB) package designation?

A: DO-214AA is the industry-standard surface-mount package for small-signal TVS diodes. Both substitute parts use this identical package, ensuring mechanical and electrical compatibility on PCB layouts without design modification.

Q: Are there temperature-related constraints when substituting these parts?

A: The Meritek SMBJ64A has a minimum operating temperature of -55°C compared to -65°C for the Littelfuse variant. Applications requiring operation below -55°C must use the SMBJ64A-HRA. Applications within -55°C to 150°C range can use either part.

Q: Do both parts meet regulatory compliance requirements?

A: Yes. Both SMBJ64A-HRA and SMBJ64A are RoHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations.

Q: What determines whether a part qualifies as a substitute?

A: Substitution is based on matching voltage specifications (reverse standoff, breakdown, and clamping), identical package type (DO-214AA), equivalent power rating (600W peak pulse), and compliance certifications (RoHS3, REACH). Peak pulse current must remain within acceptable tolerance of the original specification.