P4KE91C-B Equivalent & Substitute Parts

Part Overview

The P4KE91C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional zener diode operates in the 77.8V reverse standoff voltage range with a 131.25V maximum clamping voltage and 3.3A peak pulse current rating. The component is packaged in a DO-204AL (DO-41) through-hole axial configuration and is rated for -55°C to 175°C operating temperature.

The P4KE91C-B is classified as obsolete. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring this voltage suppression specification.

Substiute Parts

P4KE91C-B

Littelfuse Inc.In Stock: 1038P4KE91C-B Datasheet

Current PartRFQ

P4KE91CA

Taiwan Semiconductor CorporationIn Stock: 904P4KE91CA Datasheet

DirectRFQ

P4KE91CA-B

Littelfuse Inc.In Stock: 903P4KE91CA-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE91C-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 77.8V
• Current - Peak Pulse (10/1000µs): 3.3A
• Power - Peak Pulse: 400W
• Mounting Type: Through Hole
• Package / Case: DO-204AL (DO-41), Axial
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Bidirectional Channels: 1
• Type: Zener

The substitute parts P4KE91CA and P4KE91CA-B maintain identical reverse standoff voltage, peak pulse current, power rating, mounting configuration, and operating temperature specifications. Both are part of the same P4KE series base product family. The primary difference is the voltage clamping specification: the P4KE91C-B specifies 131.25V maximum clamping voltage, while the substitute parts specify 125V maximum clamping voltage. This represents a tighter clamping specification in the substitute parts, which is compatible with applications designed for the original part.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE91CA and P4KE91CA-B are active product alternatives to the obsolete P4KE91C-B. Selection between these substitutes depends on procurement and inventory requirements:

P4KE91CA-B is the preferred substitute when bulk packaging is required, as it maintains the same packaging format as the original part and is manufactured by Littelfuse Inc., the original manufacturer. This option ensures continuity with the original design source.

P4KE91CA is suitable when tape and reel packaging is acceptable for automated assembly processes. This part is manufactured by Taiwan Semiconductor Corporation and maintains full electrical and mechanical compatibility with the original specification.

Both substitute parts are ROHS3 compliant and carry unlimited moisture sensitivity rating (MSL 1), matching the environmental compliance profile of the original part. The tighter clamping voltage specification (125V versus 131.25V) in the substitute parts provides enhanced transient suppression performance and is compatible with applications designed for the original part.

Frequently Asked Questions (FAQ)

Q: Can P4KE91CA or P4KE91CA-B be used as direct replacements for P4KE91C-B?

A: Yes. Both substitute parts maintain identical reverse standoff voltage (77.8V), peak pulse current (3.3A), power rating (400W), operating temperature range (-55°C to 175°C), and through-hole DO-204AL packaging. The substitute parts feature a tighter maximum clamping voltage specification (125V versus 131.25V), which provides equivalent or improved transient suppression performance.

Q: What is the difference between P4KE91CA and P4KE91CA-B?

A: The primary difference is packaging format. P4KE91CA is supplied in tape and reel (TR) format, suitable for automated pick-and-place assembly. P4KE91CA-B is supplied in bulk format, matching the original part's packaging. Electrical specifications are identical between the two variants.

Q: Why do the substitute parts have a different voltage breakdown minimum (86.5V versus 81.9V)?

A: The voltage breakdown minimum represents the lower tolerance limit of the reverse standoff voltage specification. Both the original part and substitute parts maintain the same typical reverse standoff voltage of 77.8V. The substitute parts' higher breakdown minimum reflects tighter manufacturing tolerance control and does not affect circuit compatibility.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both P4KE91CA and P4KE91CA-B are ROHS3 compliant, matching the environmental compliance status of the original P4KE91C-B.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. The substitute parts are pin-compatible and functionally equivalent. No PCB layout modifications are required. The through-hole axial lead configuration and DO-204AL package dimensions are identical across all three parts.