SMB6F6.0AY Equivalent & Substitute Parts

Part Overview

The SMB6F6.0AY is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by STMicroelectronics, designed for surface mount applications in automotive-grade circuits. This component features a 6V reverse standoff voltage with a 10.3V maximum clamping voltage and 61A peak pulse current capability. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility within the same electrical and mechanical parameter ranges.

Substiute Parts

SMB6F6.0AY

STMicroelectronicsIn Stock: 5732SMB6F6.0AY Datasheet

Current PartRFQ

SM6F6.0AY

STMicroelectronicsIn Stock: 889SM6F6.0AY Datasheet

MFR RecommendedRFQ

SMA6T7V6AY

STMicroelectronicsIn Stock: 625SMA6T7V6AY Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMB6F6.0AY is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reverse standoff voltage within the 6V nominal range
• Breakdown voltage minimum at or above 6.7V
• Clamping voltage performance suitable for transient suppression
• Peak pulse current capability meeting or exceeding application requirements
• Peak pulse power rating of 600W
• Unidirectional channel configuration (single channel)
• Zener diode type classification

Mechanical & Compliance Criteria:

• Surface mount mounting type
• Automotive grade classification
• AEC-Q101 qualification
• ROHS3 compliance
• Operating temperature range of -55°C to 175°C or compatible subset

Package Considerations:

• Original package: DO-221AA, SMB Flat Leads (SMBflat)
• Substitute packages must be surface mount compatible with equivalent footprint or documented PCB layout compatibility

The substitute parts identified maintain the base product number SM6F6.0 or equivalent voltage class while offering active product status and enhanced electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

SM6F6.0AY (MFR Recommended Substitute):

The SM6F6.0AY is the manufacturer-recommended equivalent for the obsolete SMB6F6.0AY. This part maintains the same base product number (SM6F6.0) and shares identical reverse standoff voltage (6V) and breakdown voltage (6.7V) specifications. The SM6F6.0AY is classified as active product status, ensuring long-term availability and supply chain continuity. Both parts carry automotive grade classification and AEC-Q101 qualification, meeting identical compliance requirements. The SM6F6.0AY provides enhanced peak pulse current capability (290A versus 61A) and operates across the same temperature range (-55°C to 175°C). The primary difference is the package format: SM6F6.0AY uses SOD-128 (SOD128Flat) versus the original SMBflat package. PCB layout modification is required to accommodate the different package footprint.

SMA6T7V6AY (Similar Alternative):

The SMA6T7V6AY is classified as a similar alternative rather than a direct equivalent. This part operates within the same voltage class family with a 6.5V reverse standoff voltage and 7.2V minimum breakdown voltage, representing a slight voltage offset from the original specification. The SMA6T7V6AY delivers comparable peak pulse current (276A) and maintains automotive grade and AEC-Q101 qualification. The operating temperature range is narrower (-40°C to 150°C) compared to the original part. The package format is DO-214AC (SMA), requiring PCB layout modification. Selection of this alternative is appropriate when the higher reverse standoff voltage and clamping voltage are compatible with circuit design parameters.

Product Status Consideration:

The SMB6F6.0AY is obsolete; therefore, substitution is mandatory for new designs or component replenishment. The SM6F6.0AY is the preferred path forward due to manufacturer recommendation and identical electrical specifications. The SMA6T7V6AY serves as a secondary option when package constraints or voltage tolerance requirements favor the SMA form factor.

Frequently Asked Questions (FAQ)

Q: Can SM6F6.0AY directly replace SMB6F6.0AY without circuit modification?

A: The SM6F6.0AY provides electrical equivalence with identical voltage specifications (6V standoff, 6.7V breakdown minimum, 13.7V clamping maximum). However, the package format differs (SOD-128 versus SMBflat). PCB layout modification is required to accommodate the different footprint. Electrical circuit operation remains compatible.

Q: What is the difference between the 10/1000µs and 8/20µs pulse specifications?

A: These represent different test pulse waveforms used to characterize peak pulse current. The SMB6F6.0AY is specified at 10/1000µs (61A), while SM6F6.0AY and SMA6T7V6AY are specified at 8/20µs (290A and 276A respectively). The 8/20µs waveform is a standard industrial test pulse. Both specifications are valid for their respective parts; direct numerical comparison of peak current values across different pulse waveforms is not applicable.

Q: Is the SMA6T7V6AY suitable for applications designed for SMB6F6.0AY?

A: The SMA6T7V6AY operates at a higher reverse standoff voltage (6.5V versus 6V) and higher clamping voltage (14.5V versus 10.3V). Substitution is valid only if the circuit design tolerates these higher voltage levels. The narrower operating temperature range (-40°C to 150°C versus -55°C to 175°C) may also be a limiting factor in extreme temperature environments. Verify circuit specifications before selection.

Q: Are all three parts automotive-qualified?

A: Yes. All three parts carry automotive grade classification and AEC-Q101 qualification, meeting automotive industry reliability and quality standards.

Q: What packaging considerations apply to substitution?

A: The SMB6F6.0AY uses DO-221AA (SMBflat) package. The SM6F6.0AY uses SOD-128 (SOD128Flat) package. The SMA6T7V6AY uses DO-214AC (SMA) package. Each package has a distinct footprint. PCB layout modification is required for any substitution. Verify footprint compatibility with your PCB design tools before component procurement.

Q: Why is SM6F6.0AY listed as the manufacturer-recommended substitute?

A: STMicroelectronics designates SM6F6.0AY as the recommended replacement for the obsolete SMB6F6.0AY. This part shares the same base product number (SM6F6.0), identical voltage specifications, and active product status, ensuring supply chain continuity and design compatibility.

Q: Are there RoHS and REACH compliance differences between the parts?

A: All three parts are ROHS3 compliant and REACH unaffected. Compliance status is identical across all options.