P6KE91C Equivalent & Substitute Parts

Part Overview

The P6KE91C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This bidirectional zener diode operates in the DO-204AC (DO-15) axial package and provides 600W peak pulse power dissipation with a clamping voltage of 131.25V at peak pulse current. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P6KE91C

Littelfuse Inc.In Stock: 808P6KE91C Datasheet

Current PartRFQ

P6KE91CA

Fairchild SemiconductorIn Stock: 1735P6KE91CA Datasheet

DirectRFQ

P6KE91CA

Fairchild SemiconductorIn Stock: 1735P6KE91CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P6KE91C is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 77.8V
• Voltage - Breakdown (Min): 81.9V minimum
• Voltage - Clamping (Max) @ Ipp: Must not exceed 131.25V
• Power - Peak Pulse: 600W
• Package / Case: DO-204AC (DO-15) axial through-hole
• Bidirectional Channels: 1
• Type: Zener diode

The P6KE91CA from Fairchild Semiconductor meets these substitution criteria. Both parts share identical reverse standoff voltage (77.8V), equivalent power dissipation (600W), matching package configuration (DO-15/DO-204AC), and compatible operating temperature ranges. The P6KE91CA maintains the same bidirectional zener diode topology required for transient voltage suppression applications.

Parameter Comparison

Engineering Selection Recommendations

The P6KE91CA is a direct functional equivalent for the obsolete P6KE91C. Both devices share identical reverse standoff voltage specifications and equivalent power dissipation ratings, ensuring compatible performance in transient voltage suppression circuits. The P6KE91CA features an active product status, providing long-term availability and supply chain continuity compared to the obsolete P6KE91C.

The P6KE91CA exhibits a lower clamping voltage (125V versus 131.25V), which provides improved transient protection margins. The minimum breakdown voltage of 86.5V on the P6KE91CA is slightly higher than the P6KE91C specification (81.9V), remaining within acceptable tolerance for general-purpose voltage suppression applications. Both parts maintain identical package configuration and through-hole mounting characteristics, enabling direct mechanical and electrical substitution without circuit board redesign.

Frequently Asked Questions (FAQ)

Q: Can the P6KE91CA directly replace the P6KE91C in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (77.8V), equivalent power dissipation (600W), and identical DO-15 axial package configuration. Direct substitution is mechanically and electrically compatible without circuit modifications.

Q: What is the significance of the clamping voltage difference between these parts?

A: The P6KE91CA clamping voltage (125V) is lower than the P6KE91C (131.25V). This difference represents improved transient suppression performance, as lower clamping voltage reduces voltage stress on protected components during transient events.

Q: Are there any temperature range considerations for substitution?

A: The P6KE91C operates from -55°C to 175°C, while the P6KE91CA operates from -50°C to 175°C. For applications requiring operation below -50°C, the original P6KE91C specification must be maintained. For standard industrial and commercial temperature ranges, both parts are equivalent.

Q: Does the P6KE91CA provide the same RoHS compliance as the P6KE91C?

A: The P6KE91C is explicitly ROHS3 compliant. RoHS compliance status for the P6KE91CA is not specified in the provided data. Verify RoHS certification with the supplier if regulatory compliance is required for your application.

Q: What is the impact of the 5A peak pulse current specification on the P6KE91CA?

A: The P6KE91CA specifies 5A peak pulse current (10/1000µs), while the P6KE91C does not provide this parameter. Both devices maintain identical 600W power dissipation, which is the primary design constraint for transient suppression applications.