P6KE91CA-T Equivalent & Substitute Parts

Part Overview

The P6KE91CA-T is a 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 clamping capability and 4.8A peak pulse current handling. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new designs.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	77.8V
Voltage - Breakdown (Min)	86.5V
Voltage - Clamping (Max) @ Ipp	125V
Current - Peak Pulse (10/1000µs)	4.8A
Power - Peak Pulse	600W
Type	Zener
Bidirectional Channels	1
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the P6KE91CA-T 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, Bidirectional (1 channel)
Mounting Type: Through Hole
Package / Case: DO-204AC or DO-15 compatible

All identified substitutes maintain these core electrical specifications within the allowed tolerance range. Packaging variants (Bulk, Tape & Reel, Cut Tape) are interchangeable for the same electrical performance. Operating temperature ranges may vary slightly between manufacturers but all substitutes support the minimum required range of -55°C to 175°C.

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ)	Vbr (Min)	Vc (Max)	Ipp (A)	Ppk (W)	Package	Status
P6KE91CA-T	Diodes Incorporated	77.8V	86.5V	125V	4.8A	600W	DO-15	Obsolete
P6KE91CA-B	Littelfuse Inc.	77.8V	86.5V	125V	4.9A	600W	DO-204AC (DO-15)	Active
P6KE91CA	Fairchild Semiconductor	77.8V	86.5V	125V	5A	600W	DO-15 (DO-204AC)	Active
P6KE91CA-AP	Micro Commercial Co	77.8V	86.5V	125V	4.8A	600W	DO-15	Active
P6KE91CA-BP	Micro Commercial Co	77.8V	86.5V	125V	4.8A	600W	DO-15	Active
P6KE91CA-E3/54	Vishay General Semiconductor - Diodes Division	77.8V	86.5V	125V	4.8A	600W	DO-204AC (DO-15)	Active
P6KE91CAHE3/54	Vishay General Semiconductor - Diodes Division	77.8V	86.5V	125V	4.8A	600W	DO-204AC (DO-15)	Active
P6KE91CA-TP	Micro Commercial Co	77.8V	86.5V	125V	4.8A	600W	DO-15	Active
P6KE91CAE3/TR13	Microsemi Corporation	77.8V	86.5V	125V	4.8A	600W	Axial	Active
TP6KE91CA	Littelfuse Inc.	77.8V	86.5V	125V	4.9A	600W	DO-204AC (DO-15)	Active

Engineering Selection Recommendations

All listed substitute parts maintain full electrical equivalence to the P6KE91CA-T across voltage, current, and power specifications. Selection among active alternatives should prioritize the following factors:

Product Status: All substitutes are classified as Active, ensuring continued availability and manufacturing support compared to the obsolete original part.

Compliance & Certifications: All substitutes maintain ROHS3 compliance. The P6KE91CAHE3/54 and TP6KE91CA variants include AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability. The P6KE91CAE3/TR13 from Microsemi is available with automotive-grade designation.

Packaging Compatibility: DO-204AC and DO-15 designations are mechanically and electrically interchangeable for through-hole PCB mounting. The P6KE91CAE3/TR13 uses axial packaging (T-18), which is functionally equivalent but requires different PCB footprint accommodation.

Inventory Availability: Littelfuse TP6KE91CA offers the highest stock level (9,527 pcs), followed by Fairchild P6KE91CA (1,700 pcs), providing supply chain flexibility for volume requirements.

Temperature Range: Most substitutes support -55°C to 175°C operation. The P6KE91CAE3/TR13 operates within -65°C to 150°C, which covers the original specification but with reduced upper temperature margin.

Frequently Asked Questions (FAQ)

Q: Can P6KE91CA-B from Littelfuse directly replace P6KE91CA-T?

A: Yes. The P6KE91CA-B maintains identical voltage specifications (77.8V standoff, 86.5V breakdown, 125V clamping) with marginally higher peak pulse current (4.9A vs 4.8A). Both are ROHS3 compliant and rated for -55°C to 175°C operation. The DO-204AC package designation is mechanically equivalent to DO-15.

Q: What is the difference between P6KE91CA-E3/54 and P6KE91CAHE3/54?

A: Both parts are manufactured by Vishay with identical electrical specifications. The P6KE91CAHE3/54 includes AEC-Q101 automotive qualification and automotive-grade designation, making it suitable for automotive applications requiring enhanced reliability screening. Electrical performance is equivalent.

Q: Is the axial package variant P6KE91CAE3/TR13 compatible with DO-15 PCB footprints?

A: No. The axial package (T-18) uses a different physical form factor than DO-15 (DO-204AC). PCB footprint redesign is required. However, electrical specifications are fully equivalent, and the part is suitable for applications where axial mounting is acceptable.

Q: Are there any temperature range limitations when substituting?

A: All substitutes support the original -55°C to 175°C operating range except P6KE91CAE3/TR13, which operates to 150°C maximum. For applications requiring full 175°C operation, select alternatives from Littelfuse, Fairchild, Micro Commercial Co, or Vishay.

Q: Which substitute offers the best long-term availability?

A: Littelfuse TP6KE91CA (Active status, 9,527 pcs in stock) and Fairchild P6KE91CA (Active status, 1,700 pcs in stock) represent the most established alternatives with strong supply chain presence.

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