P4KE27C-B Equivalent & Substitute Parts

Part Overview

The P4KE27C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in through-hole 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 DO-204AL (DO-41) axial package. The product is currently obsolete, making identification of functionally equivalent alternatives essential for circuit redesign, repair, and ongoing system support.

Substiute Parts

P4KE27C-B

LittelfuseIn Stock: 808P4KE27C-B Datasheet

Current PartRFQ

P4KE27CA

Taiwan Semiconductor CorporationIn Stock: 1058P4KE27CA Datasheet

DirectRFQ

P4KE27CA-B

LittelfuseIn Stock: 1094P4KE27CA-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4KE27C-B is determined by the following critical electrical and mechanical parameters:

• Reverse standoff voltage: 23.1V (must match)
• Bidirectional channels: 1 (must match)
• Package type: DO-204AL / DO-41 axial (must match)
• Mounting type: Through hole (must match)
• Operating temperature range: -55°C ~ 175°C (must match)
• Peak pulse power rating: 400W (must match)
• Zener type classification (must match)

The substitute parts P4KE27CA and P4KE27CA-B maintain identical reverse standoff voltage, package configuration, and thermal operating range. Both alternatives are active products from the same P4KE series, ensuring design continuity and long-term availability. Clamping voltage and peak pulse current parameters vary within acceptable tolerances for general-purpose TVS applications while preserving the core protection function.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE27CA and P4KE27CA-B are qualified substitutes for the obsolete P4KE27C-B. Selection between the two alternatives is based on product availability and supply chain considerations:

P4KE27CA-B is the preferred choice when available, as it is manufactured by Littelfuse, the original equipment manufacturer of the P4KE27C-B. This maintains design continuity with the original supplier and ensures consistency in manufacturing processes and quality standards. The P4KE27CA-B is currently active with 1017 pieces in stock.

P4KE27CA, manufactured by Taiwan Semiconductor Corporation, serves as a secondary alternative. This part maintains all critical electrical parameters and package specifications while offering 954 pieces in current inventory. Both parts are ROHS3 compliant and carry identical moisture sensitivity ratings.

The clamping voltage differential (37.5V for substitutes versus 39.38V for the original) represents a 4.8% reduction and remains within acceptable tolerance for general-purpose transient suppression applications where the primary function is overvoltage clamping within the specified operating range.

Frequently Asked Questions (FAQ)

Q: Can P4KE27CA or P4KE27CA-B be used as direct replacements for P4KE27C-B in existing designs?

A: Yes. Both substitute parts maintain the critical parameters that define functional equivalence: identical reverse standoff voltage (23.1V), package type (DO-204AL axial), mounting configuration (through hole), and thermal operating range (-55°C to 175°C). Direct PCB substitution is possible without circuit modification.

Q: What is the significance of the clamping voltage difference between the original and substitute parts?

A: The original P4KE27C-B specifies a maximum clamping voltage of 39.38V, while both substitutes specify 37.5V. This 1.88V difference represents improved clamping performance in the substitute parts and does not compromise circuit protection. The lower clamping voltage provides more aggressive transient suppression.

Q: Are there packaging differences between P4KE27CA and P4KE27CA-B?

A: P4KE27CA-B is supplied in bulk packaging, while P4KE27CA packaging is not specified in the provided data. Both parts use identical DO-204AL (DO-41) axial package geometry and are suitable for through-hole PCB assembly.

Q: Which substitute part should be selected for new production designs?

A: P4KE27CA-B is recommended for new designs due to Littelfuse manufacturing continuity with the original P4KE27C-B. This maintains supplier consistency and simplifies long-term supply chain management.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both P4KE27CA and P4KE27CA-B are ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity), matching the compliance profile of the original P4KE27C-B.