SMB6F58A Equivalent & Substitute Parts

Part Overview

The SMB6F58A 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 58V reverse standoff voltage with a 121V maximum clamping voltage and 33A peak pulse current capability in an SMBflat (DO-221AA) package format.

The SMB6F58A 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 utilizing this TVS diode specification.

Substiute Parts

SMB6F58A

STMicroelectronicsIn Stock: 10863SMB6F58A Datasheet

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SMBJ58A-TR

STMicroelectronicsIn Stock: 47869SMBJ58A-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMB6F58A are identified based on the following critical electrical and mechanical parameters:

Voltage Compatibility: The reverse standoff voltage (58V typical) and breakdown voltage minimum (64.4V–64.6V) must remain consistent to ensure proper circuit protection thresholds.

Clamping Voltage: The maximum clamping voltage determines the peak voltage experienced by protected circuitry. The SMB6F58A specifies 121V maximum clamping at peak pulse current.

Peak Pulse Current: The 33A peak pulse current (8/20µs) represents the transient suppression capability. Substitute parts must maintain this current rating or higher to preserve protection performance.

Power Dissipation: The 600W peak pulse power rating establishes the thermal handling capacity during transient events.

Package and Mounting: Surface-mount compatibility and SMB-family packaging ensure mechanical and electrical integration with existing printed circuit board designs.

Operating Temperature Range: The -55°C to 175°C junction temperature range defines the thermal operating envelope.

The SMBJ58A-TR shares the same 58V reverse standoff voltage and 600W peak pulse power rating. However, this substitute exhibits a lower clamping voltage (93.6V maximum) and significantly reduced peak pulse current (6.7A), indicating reduced transient suppression capability compared to the original SMB6F58A specification.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The SMB6F58A is classified as obsolete, while the SMBJ58A-TR is active. Active product status ensures continued manufacturing support, availability, and compliance with current regulatory standards.

Compliance and Certifications: Both parts maintain identical REACH and ECCN classifications (REACH Unaffected, EAR99), ensuring equivalent regulatory compliance. The SMBJ58A-TR carries RoHS3 compliance certification, whereas the SMB6F58A does not specify RoHS status.

Moisture Sensitivity: Both components share MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage or handling.

Electrical Performance Trade-offs: The SMBJ58A-TR provides equivalent voltage standoff and breakdown characteristics but delivers reduced peak pulse current (6.7A versus 33A) and lower clamping voltage (93.6V versus 121V). Selection between these parts depends on whether the application circuit can tolerate the reduced transient suppression capability of the substitute.

Package Compatibility: The SMB6F58A uses SMBflat (DO-221AA) leads, while the SMBJ58A-TR uses standard SMB (DO-214AA) leads. Physical board layout modifications may be required to accommodate the different package footprint.

Temperature Range: The SMB6F58A supports operation to 175°C junction temperature, while the SMBJ58A-TR is rated to 150°C. Applications requiring the extended upper temperature range cannot use the SMBJ58A-TR as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ58A-TR directly replace the SMB6F58A in all applications?

A: Direct replacement is not universally applicable. Both parts share the same 58V reverse standoff voltage and 600W peak pulse power rating. However, the SMBJ58A-TR exhibits significantly lower peak pulse current (6.7A versus 33A) and reduced clamping voltage (93.6V versus 121V). Applications requiring the full 33A transient suppression capability or 121V clamping voltage cannot use the SMBJ58A-TR without circuit redesign or supplementary protection measures.

Q: What are the package differences between SMB6F58A and SMBJ58A-TR?

A: The SMB6F58A uses DO-221AA SMBflat leads, while the SMBJ58A-TR uses DO-214AA standard SMB leads. These packages have different physical footprints and lead configurations. PCB layout modifications are required to accommodate the different package geometry.

Q: Are there temperature range limitations when substituting the SMBJ58A-TR?

A: Yes. The SMB6F58A operates to 175°C junction temperature, while the SMBJ58A-TR is rated to 150°C maximum. Applications requiring operation above 150°C junction temperature cannot use the SMBJ58A-TR as a substitute.

Q: Do both parts meet the same regulatory and compliance standards?

A: Both parts share identical REACH and ECCN classifications (REACH Unaffected, EAR99) and identical HTSUS codes (8541.10.0080). The SMBJ58A-TR carries explicit RoHS3 compliance certification. Both parts have MSL 1 (Unlimited) moisture sensitivity ratings.

Q: What is the significance of the different peak pulse current ratings?

A: Peak pulse current (33A for SMB6F58A versus 6.7A for SMBJ58A-TR) directly determines the maximum transient current the TVS diode can suppress. Lower peak pulse current indicates reduced capability to handle high-energy transient events. Circuit analysis is required to confirm whether the reduced current rating is acceptable for the intended application.

Q: How do the clamping voltage differences affect circuit protection?

A: Clamping voltage (121V for SMB6F58A versus 93.6V for SMBJ58A-TR) determines the peak voltage that appears across protected circuitry during a transient event. Lower clamping voltage provides better protection but may be insufficient if the protected components require the higher voltage margin provided by the original 121V specification.