P6SMB91AT3 Equivalent & Substitute Parts

Part Overview

The P6SMB91AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for clamping and protection applications in 91V circuits. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design requirements and procurement needs. The part is packaged in SMB (DO-214AA) surface mount configuration with 600W peak pulse power rating and RoHS non-compliant status.

Substiute Parts

P6SMB91AT3

onsemiIn Stock: 1056P6SMB91AT3 Datasheet

Current PartRFQ

P6SMB91A

Eaton - Electronics DivisionIn Stock: 30307P6SMB91A Datasheet

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SMBJ70A-TR

STMicroelectronicsIn Stock: 12994SMBJ70A-TR Datasheet

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SMBJ78A

MDDIn Stock: 9439SMBJ78A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P6SMB91AT3 are qualified based on the following electrical and mechanical parameters:

• Package compatibility: All substitutes must use SMB (DO-214AA) surface mount package to ensure PCB footprint compatibility
• Power rating: All substitutes maintain 600W peak pulse power rating
• Unidirectional configuration: Single channel zener TVS diode topology
• Voltage class: Substitutes operate in the 70V to 91V reverse standoff voltage range, with clamping voltages between 113V and 126V
• Peak pulse current: Substitutes rated between 4.8A and 5.5A at 10/1000µs pulse conditions
• Operating temperature range: All substitutes support -55°C to -50°C minimum and 150°C maximum junction temperature
• Compliance: Active substitutes are RoHS3 compliant, addressing the obsolete status of the original part

Parameter Comparison

Engineering Selection Recommendations

P6SMB91A (Eaton - Electronics Division): This direct equivalent maintains the closest voltage specification to the original P6SMB91AT3 with a 77.8V reverse standoff rating and 125V clamping voltage. The part is active and RoHS compliant, addressing obsolescence and regulatory requirements. Suitable for applications requiring voltage protection in the 77V to 91V range.

SMBJ70A-TR (STMicroelectronics): This substitute operates at a lower voltage class (70V reverse standoff, 113V clamping) and provides the highest peak pulse current rating (5.5A). The part is active, ROHS3 compliant, and available in Cut Tape & Digi-Reel packaging. Appropriate for applications where lower voltage protection thresholds are acceptable and higher current handling is beneficial.

SMBJ78A (MDD): This substitute provides a 78V reverse standoff rating with 126V clamping voltage, closely matching the voltage profile of the original part. The component is active and ROHS3 compliant. Operating temperature minimum is -50°C, which is 5°C higher than the original specification. Suitable for general-purpose applications within the specified temperature range.

All three substitutes maintain SMB package compatibility, 600W power rating, and MSL 1 classification, ensuring direct PCB footprint compatibility and handling requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can P6SMB91A be used as a direct replacement for P6SMB91AT3?

A: P6SMB91A is the closest electrical equivalent, with comparable voltage ratings (77.8V standoff vs. 91V) and identical 600W power rating. Both use SMB packaging. The primary difference is product status: P6SMB91A is active and RoHS compliant, while P6SMB91AT3 is obsolete and RoHS non-compliant. PCB footprint compatibility is confirmed.

Q: What is the voltage difference between the substitute options?

A: P6SMB91A operates at 77.8V reverse standoff, SMBJ78A at 78V, and SMBJ70A-TR at 70V. All three fall within acceptable protection ranges for circuits originally designed for the 91V P6SMB91AT3, though circuit validation is necessary to confirm suitability for specific voltage thresholds.

Q: Are all substitutes available in the same packaging?

A: All substitutes use SMB (DO-214AA) surface mount packaging, ensuring identical PCB footprint compatibility. Packaging formats differ: P6SMB91A and SMBJ78A are supplied in Tape & Reel (TR), while SMBJ70A-TR is supplied in Cut Tape (CT) & Digi-Reel format.

Q: What is the operating temperature range difference?

A: P6SMB91A and SMBJ70A-TR support -55°C to 150°C junction temperature. SMBJ78A supports -50°C to 150°C, with a 5°C higher minimum temperature specification. Applications requiring operation below -50°C must use P6SMB91A or SMBJ70A-TR.

Q: Are all substitutes RoHS compliant?

A: P6SMB91A is RoHS compliant. SMBJ70A-TR and SMBJ78A are ROHS3 compliant. The original P6SMB91AT3 is RoHS non-compliant. All substitutes meet current RoHS requirements for new designs and procurement.

Q: What is the peak pulse current rating for each substitute?

A: P6SMB91A is rated at 4.9A, SMBJ78A at 4.8A, and SMBJ70A-TR at 5.5A for 10/1000µs pulse conditions. All ratings support the 600W power dissipation requirement.