SMA6F36AY Equivalent & Substitute Parts

Part Overview

The SMA6F36AY is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by STMicroelectronics, designed for general-purpose overvoltage protection applications. This component features a 36V reverse standoff voltage with a 76V maximum clamping voltage and 52A peak pulse current capability in an 8/20µs waveform. The part is qualified to AEC-Q101 automotive standards and operates across a temperature range of -55°C to 175°C.

The SMA6F36AY 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

SMA6F36AY

STMicroelectronicsIn Stock: 9073SMA6F36AY Datasheet

Current PartRFQ

SM6F36AY

STMicroelectronicsIn Stock: 1028SM6F36AY Datasheet

MFR RecommendedRFQ

SMA6T39AY

STMicroelectronicsIn Stock: 9918SMA6T39AY Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMA6F36AY are identified based on electrical and mechanical compatibility within the constraints of TVS diode specifications. The substitution logic is structured into two categories:

Recommended Manufacturer Substitute (Direct Replacement): The SM6F36AY maintains identical electrical performance parameters: 36V reverse standoff voltage, 40V minimum breakdown voltage, 76V maximum clamping voltage, and 52A peak pulse current. This part differs only in package configuration (SOD-128 versus SMA Flat) and product status (Active versus Obsolete). The electrical characteristics remain fully compatible for circuit-level substitution.

Similar Manufacturer Substitute (Parameter Variance): The SMA6T39AY operates within acceptable tolerance ranges for TVS diode applications but exhibits measurable parameter variations. The reverse standoff voltage is 33.3V (versus 36V), breakdown voltage is 37.1V (versus 40V), and clamping voltage is 69.7V (versus 76V). Peak pulse current increases to 57A (versus 52A). Operating temperature range is -40°C to 150°C (versus -55°C to 175°C). These variations require circuit-level evaluation to confirm suitability for specific application requirements.

Key Parameters Determining Substitution:

• Reverse standoff voltage tolerance
• Clamping voltage at peak pulse current
• Peak pulse current capability
• Operating temperature range
• Package and mounting compatibility
• Automotive qualification status

Parameter Comparison

Engineering Selection Recommendations

SM6F36AY (Recommended Manufacturer Substitute): The SM6F36AY is the primary substitute for the obsolete SMA6F36AY. This part maintains complete electrical equivalence across all critical TVS parameters: reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current. Both parts carry AEC-Q101 automotive qualification and operate across the full temperature range of -55°C to 175°C. The SM6F36AY holds Active product status, ensuring long-term availability and supply chain continuity. The only distinction is the package configuration (SOD-128 versus SMA Flat Leads). PCB layout and footprint modifications are required to accommodate the different package geometry. This part is suitable for direct electrical substitution with mechanical redesign considerations.

SMA6T39AY (Similar Manufacturer Substitute): The SMA6T39AY is classified as a similar substitute due to measurable deviations in electrical parameters. The reverse standoff voltage is 3.3V lower (33.3V versus 36V), clamping voltage is 6.3V lower (69.7V versus 76V), and operating temperature range is reduced by 25°C at the lower bound (-40°C versus -55°C). Peak pulse current is 5A higher (57A versus 52A). The part maintains AEC-Q101 qualification and Active product status. The package configuration is DO-214AC (SMA), which differs from the original SMA Flat Leads. This substitute is applicable only when circuit design tolerances accommodate the lower voltage parameters and reduced temperature range. Applications requiring the full -55°C lower temperature limit or maximum 76V clamping voltage specification are not suitable for this substitute.

Frequently Asked Questions (FAQ)

Q: Can SM6F36AY be used as a direct replacement for SMA6F36AY without circuit modification?

A: SM6F36AY provides complete electrical equivalence and is electrically interchangeable. However, the package change from SMA Flat Leads (DO-221AC) to SOD-128 requires PCB footprint and layout modifications. Electrical circuit performance remains unchanged.

Q: What are the key differences between SMA6F36AY and SMA6T39AY?

A: The SMA6T39AY exhibits three primary parameter differences: reverse standoff voltage is 33.3V (versus 36V), clamping voltage is 69.7V (versus 76V), and operating temperature minimum is -40°C (versus -55°C). Peak pulse current is 57A (versus 52A). These variations require circuit-level evaluation for compatibility.

Q: Is SMA6T39AY suitable for applications requiring -55°C operation?

A: No. The SMA6T39AY operating temperature range is -40°C to 150°C. Applications requiring -55°C minimum temperature operation must use SMA6F36AY or SM6F36AY.

Q: Do all substitute parts maintain automotive qualification?

A: Yes. Both SM6F36AY and SMA6T39AY carry AEC-Q101 automotive qualification, matching the original SMA6F36AY specification.

Q: What packaging options are available for these TVS diodes?

A: SMA6F36AY uses SMA Flat Leads (DO-221AC). SM6F36AY uses SOD-128 package. SMA6T39AY uses DO-214AC (SMA) package. Each package requires specific PCB footprint design.

Q: Are there moisture sensitivity considerations for these parts?

A: SMA6F36AY and SMA6T39AY both specify MSL 1 (Unlimited), indicating no moisture sensitivity limitations. SM6F36AY does not specify MSL rating in the provided data.

Q: Can these parts be used interchangeably in high-temperature applications above 150°C?

A: SMA6F36AY and SM6F36AY operate to 175°C and are suitable for high-temperature applications. SMA6T39AY is limited to 150°C maximum and is not suitable for applications requiring operation above 150°C.