SMB6F36A Equivalent & Substitute Parts

Part Overview

The SMB6F36A 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 36V reverse standoff voltage with a 76V maximum clamping voltage and 52A peak pulse current capability in an SMBflat package configuration.

The SMB6F36A 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 component.

Substiute Parts

SMB6F36A

STMicroelectronicsIn Stock: 11118SMB6F36A Datasheet

Current PartRFQ

SMBJ40A-TR

STMicroelectronicsIn Stock: 3286SMBJ40A-TR Datasheet

MFR RecommendedRFQ

SMBJ36CA-TR

STMicroelectronicsIn Stock: 58364SMBJ36CA-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMB6F36A is determined by alignment of the following critical electrical and mechanical parameters:

Electrical Criteria:

• Reverse standoff voltage within the 36V to 40V range
• Clamping voltage performance compatible with circuit protection requirements
• Peak pulse current capability sufficient for transient suppression
• Peak pulse power rating of 600W
• Zener diode type classification
• Unidirectional channel configuration

Mechanical Criteria:

• Surface-mount package configuration (SMB or SMBflat variants)
• DO-214AA or DO-221AA package families
• Operating temperature range spanning -55°C minimum

Compliance Criteria:

• REACH Unaffected status
• EAR99 export classification
• Moisture Sensitivity Level 1

The substitute parts identified maintain functional equivalence within these defined parameters while accommodating variations in packaging format and product status transitions from obsolete to active availability.

Parameter Comparison

Engineering Selection Recommendations

SMBJ40A-TR (MFR Recommended Substitute)

The SMBJ40A-TR is designated as the manufacturer-recommended substitute. This part maintains active product status with ROHS3 compliance certification, ensuring long-term supply chain viability and regulatory alignment. The 40V reverse standoff voltage represents a 4V increase from the original specification, with a corresponding reduction in peak pulse current from 52A to 9.7A. The clamping voltage decreases from 76V to 64.5V. The operating temperature maximum is reduced from 175°C to 150°C. Package transition from SMBflat (DO-221AA) to standard SMB (DO-214AA) requires PCB layout verification for mechanical compatibility.

SMBJ36CA-TR (Similar Substitute)

The SMBJ36CA-TR maintains the original 36V reverse standoff voltage specification, providing closer electrical alignment to the SMB6F36A. This part features active product status and ROHS3 compliance. The bidirectional channel configuration differs from the original unidirectional design. Peak pulse current is reduced to 10.3A with clamping voltage at 58.1V. Operating temperature maximum is 150°C. Package format is standard SMB (DO-214AA), requiring PCB layout assessment.

Both substitute parts satisfy REACH and EAR99 compliance requirements. Selection between these options depends on circuit protection requirements regarding voltage clamping performance, peak current handling, and temperature operating range constraints.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ40A-TR directly replace the SMB6F36A without circuit modifications?

A: The SMBJ40A-TR is electrically compatible for general-purpose TVS applications within the specified voltage and current parameters. However, the 4V increase in reverse standoff voltage and reduction in peak pulse current from 52A to 9.7A require circuit analysis to confirm adequate protection margins. Package format change from SMBflat to standard SMB requires PCB footprint verification.

Q: What is the significance of the bidirectional channel configuration in the SMBJ36CA-TR?

A: The SMBJ36CA-TR features bidirectional protection, suppressing transients on both positive and negative voltage excursions. The SMB6F36A is unidirectional, protecting against transients in a single polarity direction. Application requirements determine whether bidirectional protection is acceptable or if unidirectional performance is mandatory.

Q: How does the operating temperature range reduction from 175°C to 150°C affect component selection?

A: The SMB6F36A supports junction temperatures to 175°C, while both substitute parts are rated to 150°C maximum. Applications with thermal environments approaching or exceeding 150°C junction temperature require thermal analysis to confirm the substitute part remains within safe operating limits.

Q: Are there package compatibility considerations between SMBflat and standard SMB formats?

A: SMBflat (DO-221AA) and standard SMB (DO-214AA) packages have different physical dimensions and lead configurations. PCB footprints designed for SMBflat require modification to accommodate standard SMB components. Mechanical fit verification is necessary before design implementation.

Q: Do the substitute parts maintain the same moisture sensitivity level?

A: Yes, all three parts—SMB6F36A, SMBJ40A-TR, and SMBJ36CA-TR—are classified as Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: What is the difference between the MFR Recommended and Similar substitute classifications?

A: The SMBJ40A-TR is designated as MFR Recommended, indicating STMicroelectronics' official substitute path for the obsolete SMB6F36A. The SMBJ36CA-TR is classified as Similar, maintaining closer electrical alignment to the original part but without formal manufacturer recommendation status. Both are active products with current availability.