P6KE91-B Equivalent & Substitute Parts

Part Overview

The P6KE91-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 77.8V reverse standoff voltage with a 131.25V maximum clamping voltage and 600W peak pulse power rating in a through-hole DO-204AC (DO-15) axial package. The P6KE91-B is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and component procurement.

Substiute Parts

P6KE91-B

Littelfuse Inc.In Stock: 864P6KE91-B Datasheet

Current PartRFQ

P6KE91A

Fairchild SemiconductorIn Stock: 32302P6KE91A Datasheet

DirectRFQ

P6KE91A-B

Littelfuse Inc.In Stock: 859P6KE91A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P6KE91-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 77.8V
• Unidirectional Channels: 1
• Package / Case: DO-204AC, DO-15, Axial
• Mounting Type: Through Hole
• Power - Peak Pulse: 600W
• Category: Transient Voltage Suppressors (TVS)

Substitute parts must maintain identical reverse standoff voltage, unidirectional topology, and through-hole axial package configuration. Voltage clamping and peak pulse current characteristics may vary within acceptable design tolerances for the same voltage class. All substitutes must comply with RoHS3 requirements.

Parameter Comparison

Engineering Selection Recommendations

P6KE91A-B is the primary recommended substitute for P6KE91-B applications. This part maintains active product status with Littelfuse Inc., ensuring long-term availability and supply chain continuity. Both parts share identical reverse standoff voltage (77.8V), unidirectional topology, and through-hole DO-204AC (DO-15) axial packaging. The P6KE91A-B exhibits a lower maximum clamping voltage (125V versus 131.25V) and specified peak pulse current (4.9A), representing a tighter performance envelope suitable for the same voltage protection class.

P6KE91A from Fairchild Semiconductor is an alternative substitute with equivalent electrical characteristics to P6KE91A-B. However, this part carries obsolete product status, limiting its suitability for new designs requiring long-term component availability.

All substitute parts maintain ROHS3 compliance and 600W peak pulse power rating, ensuring regulatory and thermal performance equivalence with the original P6KE91-B specification.

Frequently Asked Questions (FAQ)

Q: Can P6KE91A-B directly replace P6KE91-B in existing designs?

A: Yes. Both parts maintain identical reverse standoff voltage (77.8V), unidirectional channel configuration, and through-hole DO-204AC (DO-15) axial package. The lower clamping voltage of P6KE91A-B (125V versus 131.25V) represents improved performance within the same voltage protection class.

Q: What is the difference between P6KE91A-B and P6KE91A?

A: Both parts share identical electrical specifications for reverse standoff voltage, breakdown voltage, and clamping voltage. P6KE91A-B is manufactured by Littelfuse Inc. with active product status, while P6KE91A is manufactured by Fairchild Semiconductor with obsolete status. For new designs, P6KE91A-B is preferred due to ongoing manufacturer support.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three parts use identical through-hole DO-204AC (DO-15) axial packaging, ensuring direct mechanical and electrical compatibility on printed circuit boards without layout modifications.

Q: Does the specified peak pulse current difference affect substitution suitability?

A: The peak pulse current specifications (4.9A for P6KE91A-B and 4.8A for P6KE91A) represent minor variations within the same 600W power class. Both values are acceptable for the 77.8V reverse standoff voltage rating.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. P6KE91-B, P6KE91A-B, and P6KE91A all maintain ROHS3 compliance, ensuring regulatory equivalence for applications requiring environmental and hazardous substance restrictions.