SMA6F36A Equivalent & Substitute Parts

Part Overview

The SMA6F36A 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 device is packaged in a DO-221AC SMAflat surface-mount configuration with a 600W peak pulse power rating.

The SMA6F36A is classified as an obsolete product. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this TVS diode specification.

Substiute Parts

SMA6F36A

STMicroelectronicsIn Stock: 863SMA6F36A Datasheet

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SMA6J40A-TR

STMicroelectronicsIn Stock: 5153SMA6J40A-TR Datasheet

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SMA6L36A

Littelfuse Inc.In Stock: 6626SMA6L36A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMA6F36A is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 36V nominal
• Voltage - Breakdown (Min): 40V minimum
• Voltage - Clamping (Max) @ Ipp: Must not exceed 76V
• Current - Peak Pulse (8/20µs): Minimum 52A capability
• Power - Peak Pulse: 600W rating
• Unidirectional Channels: 1 channel configuration
• Type: Zener diode

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Package / Case: DO-221AC or equivalent SMA package footprint
• Operating Temperature Range: -55°C to 175°C minimum

Substitute parts must satisfy all electrical parameters within the specified tolerances and maintain mechanical compatibility with the original package designation. The SMA6J40A-TR and SMA6L36A meet these substitution criteria with variations in clamping voltage, peak pulse current, and manufacturer designation while maintaining functional equivalence for general-purpose TVS applications.

Parameter Comparison

Engineering Selection Recommendations

SMA6J40A-TR (STMicroelectronics): This substitute is an active product with ROHS3 compliance and identical operating temperature range (-55°C to 175°C). The SMA6J40A-TR exhibits a 40V reverse standoff voltage (4V higher than the main part) and 73.6V clamping voltage (2.4V lower than the main part). Peak pulse current is 48A (4A lower than the main part). The package designation is DO-214AC (SMA), which differs from the SMAflat configuration of the original part. This substitute is suitable for applications where the higher standoff voltage and lower clamping voltage are acceptable within circuit design margins, and where DO-214AC package compatibility exists.

SMA6L36A (Littelfuse Inc.): This substitute is an active product with ROHS3 compliance and matches the original 36V reverse standoff voltage. The SMA6L36A features a 58.1V clamping voltage (17.9V lower than the main part) and 10.4A peak pulse current (41.6A lower than the main part). The package is DO-221AC with SMA Flat Leads, providing mechanical compatibility with the original part. Operating temperature range is -65°C to 150°C (lower maximum temperature than the main part). This substitute is suitable for lower-current applications where the reduced clamping voltage and current rating align with circuit requirements.

Both substitutes maintain the 600W peak pulse power rating, unidirectional single-channel configuration, and general-purpose TVS application classification. Selection between substitutes depends on specific circuit voltage and current requirements, package footprint constraints, and temperature operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the SMA6J40A-TR be used as a direct replacement for the SMA6F36A?

A: The SMA6J40A-TR is electrically compatible for general-purpose TVS applications but with parameter variations. The 40V reverse standoff voltage is 4V higher, and the 73.6V clamping voltage is 2.4V lower than the original part. The peak pulse current is 48A versus 52A. The package is DO-214AC (SMA) rather than DO-221AC (SMAflat). Substitution is valid when circuit design margins accommodate these electrical differences and the DO-214AC package footprint is compatible with the PCB layout.

Q: What are the key differences between the SMA6L36A and the SMA6F36A?

A: The SMA6L36A matches the 36V reverse standoff voltage of the original part and uses the same DO-221AC SMAflat package. However, the clamping voltage is significantly lower at 58.1V (versus 76V), and the peak pulse current is 10.4A (versus 52A). The operating temperature maximum is 150°C instead of 175°C. The SMA6L36A is suitable for lower-current protection circuits where the reduced clamping voltage and current rating are appropriate.

Q: Are there package compatibility issues between these substitutes?

A: Yes. The SMA6F36A uses DO-221AC with SMA Flat Leads. The SMA6J40A-TR uses DO-214AC (standard SMA package), which has a different footprint. The SMA6L36A uses DO-221AC with SMA Flat Leads, matching the original package. If the PCB layout is designed for SMAflat leads, the SMA6J40A-TR requires footprint modification. The SMA6L36A provides direct package compatibility.

Q: What is the significance of the product status difference between the main part and substitutes?

A: The SMA6F36A is classified as obsolete, meaning it is no longer manufactured or supported by STMicroelectronics. The SMA6J40A-TR and SMA6L36A are both active products with ongoing manufacturing and supply availability. Active product status ensures long-term component availability, technical support, and compliance with current regulatory standards including ROHS3.

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

A: Clamping voltage determines the maximum voltage level the TVS diode allows across the protected circuit node during a transient event. The SMA6F36A clamps at 76V maximum, the SMA6J40A-TR at 73.6V, and the SMA6L36A at 58.1V. Lower clamping voltage provides tighter protection but requires verification that the protected circuit components tolerate the clamping level. Higher clamping voltage allows higher transient voltages to reach the circuit. Circuit design must confirm that the substitute's clamping voltage is appropriate for the protected component specifications.

Q: What does the operating temperature range difference mean for the SMA6L36A?

A: The SMA6L36A operates from -65°C to 150°C, while the SMA6F36A operates from -55°C to 175°C. The SMA6L36A has a lower minimum temperature capability (5°C lower) but a lower maximum temperature limit (25°C lower). Applications requiring operation above 150°C junction temperature cannot use the SMA6L36A. Applications operating below -55°C benefit from the SMA6L36A's extended lower temperature range.

Q: Are there compliance or regulatory differences between these parts?

A: The SMA6J40A-TR and SMA6L36A are both ROHS3 compliant and REACH unaffected. All three parts share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. Moisture sensitivity level is 1 (Unlimited) for all parts. The active product status of the substitutes ensures compliance with current regulatory requirements, whereas the obsolete status of the main part may present long-term compliance documentation challenges.