SMB6F64A Equivalent & Substitute Parts

Part Overview

The SMB6F64A is a unidirectional transient voltage suppressor (TVS) diode manufactured by STMicroelectronics, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 64V reverse standoff voltage, 134V maximum clamping voltage, and 30A peak pulse current capability in the SMBflat package configuration.

The SMB6F64A is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Substiute Parts

SMB6F64A

STMicroelectronicsIn Stock: 11064SMB6F64A Datasheet

Current PartRFQ

SMBJ64A-TR

STMicroelectronicsIn Stock: 738SMBJ64A-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete SMB6F64A is evaluated based on the following critical electrical and mechanical parameters:

Voltage Parameters: Reverse standoff voltage (64V maximum), breakdown voltage minimum (71.1V), and clamping voltage maximum at peak pulse current (134V) establish the primary voltage protection characteristics. Substitute parts must maintain compatibility within these voltage specifications.

Current and Power Ratings: Peak pulse current capability (30A at 8/20µs) and peak pulse power (600W) define the transient energy handling capacity. These parameters determine the component's ability to suppress overvoltage events without thermal failure.

Thermal Operating Range: The temperature range of -55°C to 175°C (junction temperature) specifies the environmental conditions under which the component maintains specified performance.

Package and Mounting: Surface-mount configuration with SMB-family packaging ensures mechanical and electrical compatibility with existing printed circuit board layouts and assembly processes.

Electrical Type: Unidirectional zener-type TVS diode classification confirms the functional category and protection mechanism.

Substitute parts are identified where these parameters align with the original specification, enabling direct functional replacement in the application circuit.

Parameter Comparison

Engineering Selection Recommendations

SMBJ64A-TR as Substitute for SMB6F64A

The SMBJ64A-TR is an active-status TVS diode from STMicroelectronics that shares the same 64V reverse standoff voltage and 71V-range breakdown voltage as the obsolete SMB6F64A. Both components are unidirectional zener-type suppressors rated for general-purpose overvoltage protection.

Compliance and Regulatory Status: Both parts maintain REACH Unaffected status and EAR99 export classification, ensuring equivalent regulatory compliance for applications requiring these certifications.

Operational Differences: The SMBJ64A-TR exhibits a lower clamping voltage (103V maximum versus 134V) and reduced peak pulse current capability (5.8A versus 30A). The SMBJ64A-TR also operates within a narrower temperature range (-55°C to 150°C junction temperature versus -55°C to 175°C).

Package Consideration: The SMBJ64A-TR uses DO-214AA SMB packaging, which differs from the SMBflat package of the original part. This package difference requires verification of physical fit and lead compatibility with existing circuit board layouts.

Active Product Status: The SMBJ64A-TR maintains active product status with documented inventory availability, supporting long-term supply chain continuity compared to the obsolete SMB6F64A.

Selection of the SMBJ64A-TR is appropriate for applications where the reduced current and clamping voltage ratings align with circuit protection requirements and where package compatibility can be accommodated.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ64A-TR directly replace the SMB6F64A in all applications?

A: Direct replacement depends on application-specific current and voltage requirements. Both parts share identical reverse standoff voltage (64V) and similar breakdown voltage characteristics. However, the SMBJ64A-TR has lower peak pulse current (5.8A versus 30A) and lower clamping voltage (103V versus 134V). Applications requiring the full 30A current handling or 134V clamping voltage of the original part cannot use the SMBJ64A-TR without circuit redesign.

Q: What is the significance of the package difference between SMBflat and SMB?

A: SMBflat (DO-221AA) and SMB (DO-214AA) are distinct physical packages within the SMB family. While both are surface-mount configurations, they have different lead geometries and footprints. PCB layouts designed for SMBflat leads may not accommodate SMB package leads without modification. Physical compatibility must be verified before substitution.

Q: Why does the SMBJ64A-TR have a lower operating temperature maximum than the SMB6F64A?

A: The SMBJ64A-TR is specified for a maximum junction temperature of 150°C, compared to 175°C for the SMB6F64A. Applications operating at elevated temperatures near or above 150°C require verification that the SMBJ64A-TR maintains specified performance within the actual operating environment.

Q: Are both parts compliant with REACH and export regulations?

A: Yes. Both the SMB6F64A and SMBJ64A-TR maintain REACH Unaffected status and EAR99 export classification, indicating equivalent regulatory compliance for these frameworks.

Q: What should be evaluated when considering substitution?

A: Substitution evaluation requires confirmation of: (1) peak pulse current requirement relative to the 5.8A rating of the SMBJ64A-TR, (2) clamping voltage requirement relative to the 103V maximum of the SMBJ64A-TR, (3) operating temperature range compatibility with the 150°C maximum junction temperature, and (4) physical package compatibility with existing PCB layouts.