P4KE27-B Equivalent & Substitute Parts

Part Overview

The P4KE27-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 23.1V reverse standoff voltage with a 39.38V maximum clamping voltage and 10.9A peak pulse current capability in a through-hole DO-204AL (DO-41) axial package. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued circuit protection functionality.

Substiute Parts

P4KE27-B

Littelfuse Inc.In Stock: 1141P4KE27-B Datasheet

Current PartRFQ

P4KE27A

Taiwan Semiconductor CorporationIn Stock: 756P4KE27A Datasheet

DirectRFQ

P4KE27A-B

Littelfuse Inc.In Stock: 876P4KE27A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE27-B are qualified based on the following critical parameters that determine functional equivalence:

• Reverse standoff voltage: 23.1V (identical across all alternatives)
• Package type: DO-204AL (DO-41) axial through-hole configuration
• Zener diode type with unidirectional protection
• Operating temperature range: -55°C ~ 175°C
• RoHS3 compliance and general-purpose application classification

The identified substitutes maintain the same voltage protection threshold and mechanical form factor. Variations in clamping voltage (37.5V vs. 39.38V) and peak pulse current (10.9A to 11A) remain within the P4KE series design envelope and do not affect circuit-level protection performance for applications designed around the P4KE27 base product number.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE27A-B and P4KE27A are active product alternatives to the obsolete P4KE27-B. Selection between these substitutes should be based on the following criteria:

P4KE27A-B (Littelfuse Inc.): Maintains Littelfuse manufacturer continuity with the original part. Offers identical peak pulse current specification (10.9A) and bulk packaging format. Recommended for applications requiring manufacturer consistency and direct form-factor compatibility.

P4KE27A (Taiwan Semiconductor Corporation): Provides active product status with marginally higher peak pulse current (11A) and alternative packaging in Tape & Reel format. Suitable for high-volume production environments where tape-and-reel packaging offers assembly line efficiency benefits.

Both alternatives maintain ROHS3 compliance, identical operating temperature ranges, and equivalent voltage protection characteristics within the P4KE27 series specification envelope.

Frequently Asked Questions (FAQ)

Q: Can P4KE27A or P4KE27A-B be used as direct replacements for P4KE27-B?

A: Yes. Both parts share identical reverse standoff voltage (23.1V), operating temperature range (-55°C ~ 175°C), DO-204AL axial package configuration, and 400W peak pulse power rating. The clamping voltage difference (37.5V vs. 39.38V) and peak pulse current variation (10.9A to 11A) fall within acceptable tolerance for P4KE series applications.

Q: What is the primary difference between P4KE27A-B and P4KE27A?

A: The primary differences are manufacturer (Littelfuse vs. Taiwan Semiconductor Corporation) and packaging format (Bulk vs. Tape & Reel). Electrical specifications and package type remain equivalent.

Q: Does packaging format affect circuit performance?

A: No. Tape & Reel and Bulk packaging formats contain identical components. Packaging selection is determined by assembly process requirements and inventory management practices, not electrical performance.

Q: Are all three parts RoHS3 compliant?

A: Yes. P4KE27-B, P4KE27A-B, and P4KE27A all meet ROHS3 compliance requirements.

Q: Why is the clamping voltage different between the main part and substitutes?

A: The P4KE27A variants specify 37.5V maximum clamping voltage compared to 39.38V for the P4KE27-B. Both values remain within the P4KE27 series design specification and provide equivalent overvoltage protection for general-purpose applications.