P6KE91A-T Equivalent & Substitute Parts

Part Overview

The P6KE91A-T is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in through-hole applications. This component features a 77.8V reverse standoff voltage with 125V maximum clamping voltage and 4.8A peak pulse current capability in a DO-15 package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P6KE91A-T

Diodes IncorporatedIn Stock: 964P6KE91A-T Datasheet

Current PartRFQ

P6KE91A-B

Littelfuse Inc.In Stock: 859P6KE91A-B Datasheet

DirectRFQ

P6KE91A

Fairchild SemiconductorIn Stock: 32302P6KE91A Datasheet

DirectRFQ

P6KE91A-AP

Micro Commercial CoIn Stock: 869P6KE91A-AP Datasheet

DirectRFQ

P6KE91A-BP

Micro Commercial CoIn Stock: 1163P6KE91A-BP Datasheet

DirectRFQ

P6KE91A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 1956P6KE91A-E3/54 Datasheet

DirectRFQ

P6KE91A-TP

Micro Commercial CoIn Stock: 862P6KE91A-TP Datasheet

DirectRFQ

P6KE91AHE3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 1078P6KE91AHE3/54 Datasheet

DirectRFQ

P6KE91AE3/TR13

Microsemi CorporationIn Stock: 1606P6KE91AE3/TR13 Datasheet

MFR RecommendedRFQ

TP6KE91A

Littelfuse Inc.In Stock: 2811TP6KE91A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P6KE91A-T is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

• Voltage - Reverse Standoff: 77.8V (±tolerance)
• Voltage - Breakdown (Min): 86.5V
• Voltage - Clamping (Max) @ Ipp: 125V
• Current - Peak Pulse (10/1000µs): 4.8A minimum
• Power - Peak Pulse: 600W
• Type: Zener, Unidirectional (1 channel)
• Mounting Type: Through Hole
• Package Compatibility: DO-15, DO-204AC, or Axial

All substitute parts listed maintain these electrical specifications within the defined parameters. Package variants (DO-15 vs. DO-204AC) are mechanically compatible for through-hole mounting. Packaging format (Bulk, Cut Tape, Tape & Reel) does not affect electrical performance and represents procurement options only.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Temperature Range):

P6KE91A-AP and P6KE91A-TP (Micro Commercial Co) are direct electrical and thermal equivalents with active product status and identical -55°C to 175°C operating range. Both maintain DO-15 package compatibility with the original P6KE91A-T.

P6KE91A-B and TP6KE91A (Littelfuse Inc.) provide active alternatives with DO-204AC package compatibility. Peak pulse current is 4.9A, exceeding the 4.8A specification. Both support the full -55°C to 175°C temperature range and carry ROHS3 compliance.

Secondary Substitutes (Active Status, Specialized Packaging):

P6KE91A-E3/54 and P6KE91AHE3/54 (Vishay General Semiconductor, TransZorb® series) are active alternatives with AEC-Q101 automotive qualification. P6KE91AHE3/54 includes automotive-grade designation. Operating temperature range is -55°C to 175°C. Package format is DO-204AC (DO-15 compatible).

P6KE91AE3/TR13 (Microsemi Corporation, Axial package) is an active alternative with ROHS3 compliance. Operating temperature range is -65°C to 150°C, which is narrower than the original specification at the upper limit (150°C vs. 175°C). Axial package format requires PCB layout adjustment but maintains electrical equivalence.

Obsolete Alternatives (Not Recommended for New Designs):

P6KE91A (Fairchild Semiconductor) is obsolete and lacks specified operating temperature data. Use only if existing inventory must be consumed.

Frequently Asked Questions (FAQ)

Q: Can I use P6KE91AE3/TR13 if my application requires 175°C operation?

A: No. P6KE91AE3/TR13 is rated to 150°C maximum junction temperature, which is below the original P6KE91A-T specification of 175°C. Verify your actual operating temperature requirement before substitution.

Q: What is the difference between DO-15 and DO-204AC packages?

A: DO-15 and DO-204AC are mechanically equivalent axial through-hole packages for this TVS diode category. Both use identical lead spacing and PCB hole sizing. Package designation reflects manufacturing standards; electrical performance is identical.

Q: Are Littelfuse TP6KE91A and P6KE91A-B interchangeable?

A: Yes. Both are manufactured by Littelfuse, maintain 77.8V standoff voltage, 125V clamping voltage, and 600W peak pulse power. Peak pulse current is 4.9A for both, exceeding the 4.8A minimum. Both support -55°C to 175°C operation and ROHS3 compliance.

Q: Why do some parts list 4.9A peak pulse current instead of 4.8A?

A: Peak pulse current of 4.9A exceeds the 4.8A specification and remains within the same electrical class. This represents tighter manufacturing tolerance or improved performance and does not prevent substitution.

Q: Can I substitute an Axial package part for a DO-15 package part?

A: Electrically yes, but PCB layout modification is required. Axial packages (P6KE91AE3/TR13) use different lead geometry than DO-15/DO-204AC packages. Verify PCB hole spacing and lead bend radius compatibility before design change.

Q: Which substitute is recommended for automotive applications?

A: P6KE91AHE3/54 (Vishay, AEC-Q101 qualified, automotive grade) or TP6KE91A (Littelfuse, AEC-Q101 qualified, automotive grade) are specified for automotive use. Both maintain full electrical specifications and temperature range.

Q: Is RoHS3 compliance required for all substitutes?

A: All listed active substitutes carry ROHS3 compliance. Verify compliance requirements for your specific application and supply chain.