P6KE91A-B Equivalent & Substitute Parts

Part Overview

The P6KE91A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose transient protection applications. This through-hole component operates with a reverse standoff voltage of 77.8V and provides clamping at 125V with a peak pulse current rating of 4.8A. The part is currently active in production and ROHS3 compliant.

Equivalent and substitute parts are necessary when the primary manufacturer part becomes unavailable, when alternative packaging formats are required for assembly compatibility, or when design specifications allow for functionally equivalent alternatives from other manufacturers that meet the same electrical and mechanical parameters.

Substiute Parts

P6KE91A-B

Diodes IncorporatedIn Stock: 749P6KE91A-B Datasheet

Current PartRFQ

P6KE91A-E3/54

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

DirectRFQ

P6KE91A

Fairchild SemiconductorIn Stock: 32302P6KE91A Datasheet

MFR RecommendedRFQ

TP6KE91A

Littelfuse Inc.In Stock: 2811TP6KE91A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P6KE91A-B is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 77.8V
• 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
• Mounting Type: Through Hole
• Package / Case: DO-204AC or DO-15 (axial equivalent)
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• RoHS Status: ROHS3 Compliant

All identified substitute parts meet these electrical and mechanical requirements. Packaging format variations (Cut Tape vs. Bulk) and supplier device package designations (DO-15 vs. DO-204AC) represent equivalent physical forms suitable for through-hole assembly.

Parameter Comparison

Engineering Selection Recommendations

P6KE91A-E3/54 (Vishay General Semiconductor - Diodes Division) is the primary direct substitute. This part maintains full electrical equivalence with identical voltage and current ratings. It is actively produced, ROHS3 compliant, and available in Cut Tape packaging. The TransZorb® series designation indicates established reliability in transient suppression applications.

TP6KE91A (Littelfuse Inc.) is a qualified alternative with AEC-Q101 automotive qualification. Peak pulse current is rated at 4.9A, which exceeds the 4.8A requirement. This part is actively produced, ROHS3 compliant, and carries automotive-grade certification. Selection of this part is appropriate when automotive-grade components are specified or preferred.

P6KE91A (Fairchild Semiconductor) meets all electrical parameters but carries an Obsolete product status. This part should be selected only when existing inventory is available and no active production is required. Operating temperature range is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can P6KE91A-E3/54 be used as a direct replacement for P6KE91A-B?

A: Yes. Both parts share identical voltage ratings (77.8V standoff, 125V clamping), current ratings (4.8A peak pulse), and power dissipation (600W). Both are ROHS3 compliant, through-hole mounted, and operate across -55°C to 175°C. The primary difference is packaging format (Cut Tape vs. standard supplier packaging) and manufacturer.

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

A: DO-15 and DO-204AC are equivalent designations for the same axial through-hole package form factor. Both refer to a two-lead cylindrical component with axial leads suitable for through-hole PCB assembly. These designations are interchangeable for physical and electrical purposes.

Q: Is TP6KE91A suitable for non-automotive applications?

A: Yes. TP6KE91A meets all electrical requirements for the P6KE91A-B application. AEC-Q101 automotive qualification indicates enhanced reliability testing and is not restrictive to automotive use. This part is suitable for general-purpose transient suppression applications.

Q: Why is P6KE91A (Fairchild) listed as Obsolete?

A: Fairchild Semiconductor has discontinued production of this part number. While existing inventory may be available, new production is not supported. Active alternatives from Diodes Incorporated, Vishay, and Littelfuse are recommended for new designs and ongoing procurement.

Q: Are there any electrical differences between the substitute parts?

A: TP6KE91A has a peak pulse current rating of 4.9A compared to 4.8A for other parts. This represents a 1.3% increase and does not affect substitution eligibility. All other electrical parameters are identical across all listed parts.

Q: What compliance certifications apply to all substitute parts?

A: All active substitute parts (P6KE91A-E3/54 and TP6KE91A) are ROHS3 compliant and REACH unaffected. TP6KE91A carries additional AEC-Q101 automotive qualification. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.