P6KE91C-B Equivalent & Substitute Parts

Part Overview

The P6KE91C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This component features a 77.8V reverse standoff voltage with 131.25V maximum clamping voltage and 600W peak pulse power rating in a DO-204AC (DO-15) axial package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

P6KE91C-B

Littelfuse Inc.In Stock: 1017P6KE91C-B Datasheet

Current PartRFQ

P6KE91CA

Fairchild SemiconductorIn Stock: 1735P6KE91CA Datasheet

DirectRFQ

P6KE91CA-B

Littelfuse Inc.In Stock: 1127P6KE91CA-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P6KE91C-B is determined by the following critical parameters:

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

The substitute parts P6KE91CA-B and P6KE91CA maintain identical reverse standoff voltage (77.8V) and equivalent power dissipation (600W). Both alternatives feature reduced clamping voltage (125V maximum), which provides improved transient suppression performance while remaining within the functional requirements of the original design. All candidates share the same package configuration and through-hole mounting specification.

Parameter Comparison

Engineering Selection Recommendations

P6KE91CA-B is the primary recommended substitute. This part is manufactured by Littelfuse Inc., the original manufacturer of the P6KE91C-B, and maintains active product status. It carries ROHS3 compliance certification identical to the original part and supports the full operating temperature range (-55°C ~ 175°C). The reduced clamping voltage (125V vs. 131.25V) represents an improvement in transient suppression performance.

P6KE91CA, manufactured by Fairchild Semiconductor, is a secondary alternative. This part maintains electrical compatibility with identical reverse standoff voltage and power dissipation. The operating temperature range is slightly reduced (-50°C ~ 175°C), which may be a consideration for applications requiring the full -55°C lower limit. RoHS compliance status is not specified for this variant.

Both substitutes are currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete P6KE91C-B.

Frequently Asked Questions (FAQ)

Q: Can P6KE91CA-B be used as a direct replacement for P6KE91C-B?

A: Yes. Both parts share identical reverse standoff voltage (77.8V), equivalent power dissipation (600W), and the same DO-204AC (DO-15) through-hole package. The P6KE91CA-B features a lower maximum clamping voltage (125V vs. 131.25V), which improves transient suppression performance. Both are manufactured by Littelfuse Inc. and carry ROHS3 compliance.

Q: What is the difference between P6KE91CA-B and P6KE91CA?

A: Both parts have identical electrical specifications and package configuration. The primary differences are manufacturer (Littelfuse Inc. vs. Fairchild Semiconductor) and operating temperature range (P6KE91CA-B supports -55°C to 175°C; P6KE91CA supports -50°C to 175°C). For applications requiring operation below -50°C, P6KE91CA-B is the appropriate choice.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. All three parts use the DO-204AC (DO-15) axial through-hole package, ensuring identical PCB footprint compatibility and no layout modifications required.

Q: Why is the clamping voltage lower in the substitute parts?

A: The P6KE91CA and P6KE91CA-B feature 125V maximum clamping voltage compared to 131.25V in the P6KE91C-B. This represents a design improvement that provides faster transient suppression while maintaining the same reverse standoff voltage and power rating.

Q: What is the significance of the P6KE91C-B being obsolete?

A: Obsolete status indicates the part is no longer manufactured or supported by Littelfuse Inc. Using an active substitute ensures continued availability, technical support, and compliance with current manufacturing standards. P6KE91CA-B is the recommended active alternative from the same manufacturer.