P4KE27C Equivalent & Substitute Parts

Part Overview

The P4KE27C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in through-hole applications. This component operates with a reverse standoff voltage of 23.1V and peak pulse power rating of 400W. The P4KE27C is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	23.1V
Voltage - Breakdown (Min)	24.35V
Voltage - Clamping (Max) @ Ipp	39.38V
Current - Peak Pulse (10/1000µs)	10.9A
Power - Peak Pulse	400W
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
Type	Zener
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE27C is determined by the following critical parameters:

Reverse Standoff Voltage: 23.1V (tolerance range accommodates 23.1V ±10%)
Peak Pulse Power: 400W minimum
Mounting Type: Through Hole (DO-41 or DO-204AL package compatibility)
Operating Temperature Range: -55°C to 175°C minimum
Bidirectional Configuration: Single channel

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents: Parts with matching reverse standoff voltage (23.1V), identical peak pulse power (400W), and compatible through-hole packages. These parts maintain electrical performance within acceptable design margins.

Category B - Voltage-Shifted Alternatives: Parts with higher reverse standoff voltage (28.2V) that provide overvoltage protection at a different threshold. These are suitable only when circuit design permits higher clamping voltage.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Operating Temperature	Product Status
P4KE27C	Littelfuse	23.1V	39.38V	10.9A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Obsolete
P4KE27CA	Taiwan Semiconductor Corporation	23.1V	37.5V	11A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active
P4KE27CA-G	Comchip Technology	23.1V	37.5V	10.67A	400W	DO-204AL (DO-41)	-55°C ~ 150°C	Active
P4KE27CA-AP	Micro Commercial Co	23.1V	37.5V	10.9A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active
P4KE27CA-BP	Micro Commercial Co	23.1V	37.5V	10.9A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active
P4KE27CA-TP	Micro Commercial Co	23.1V	37.5V	10.9A	400W	DO-204AL (DO-41)	-55°C ~ 175°C	Active
BZW04-28B	Diotec Semiconductor	28.2V	45.7V	8.8A	400W	DO-204AC (DO-15)	-50°C ~ 175°C	Active

Engineering Selection Recommendations

Primary Substitutes (Category A - Direct Equivalents):

P4KE27CA, P4KE27CA-AP, P4KE27CA-BP, and P4KE27CA-TP are functionally equivalent to the P4KE27C. All maintain the 23.1V reverse standoff voltage, 400W peak pulse power, and through-hole DO-41 package configuration. These parts are manufactured by Taiwan Semiconductor Corporation and Micro Commercial Co, with active product status and ROHS3 compliance. Selection among these variants depends on packaging requirements (bulk) and availability.

P4KE27CA-G (Comchip Technology) is also a direct equivalent with identical electrical parameters. This part operates at a maximum junction temperature of 150°C, which is 25°C lower than the original specification. Selection of this part is appropriate only when circuit operating conditions remain within the -55°C to 150°C range.

Secondary Substitute (Category B - Voltage-Shifted Alternative):

BZW04-28B (Diotec Semiconductor) operates at a higher reverse standoff voltage of 28.2V with clamping voltage of 45.7V. This part is suitable only when circuit design permits operation at the elevated voltage threshold. The BZW04-28B uses DO-15 package (DO-204AC), which differs from the original DO-41 package and may require PCB layout modification. Minimum operating temperature is -50°C, which is 5°C higher than the original specification.

Frequently Asked Questions (FAQ)

Q: Can P4KE27CA directly replace P4KE27C without circuit modification?

A: Yes. P4KE27CA maintains the same reverse standoff voltage (23.1V), peak pulse power (400W), and through-hole package configuration. No circuit modification is required.

Q: What is the difference between P4KE27CA variants (AP, BP, TP)?

A: These variants are manufactured by Micro Commercial Co with identical electrical specifications. Differences are limited to packaging format (bulk) and internal manufacturing processes. Electrical performance and pin configuration are equivalent.

Q: Can BZW04-28B be used as a direct replacement?

A: BZW04-28B is not a direct replacement. The reverse standoff voltage is 5.1V higher (28.2V vs. 23.1V), and the package is DO-15 instead of DO-41. Use only when circuit design accommodates the higher voltage threshold and package footprint change.

Q: Are all substitute parts ROHS3 compliant?

A: P4KE27CA, P4KE27CA-G, and BZW04-28B are confirmed ROHS3 compliant. P4KE27CA-AP, P4KE27CA-BP, and P4KE27CA-TP have REACH Unaffected status with no RoHS conflict indicated.

Q: What is the temperature operating range difference for P4KE27CA-G?

A: P4KE27CA-G operates from -55°C to 150°C, compared to the original -55°C to 175°C. This 25°C reduction in maximum junction temperature must be verified against circuit thermal requirements before selection.

Q: Do all substitute parts use the same package footprint?

A: P4KE27CA, P4KE27CA-G, P4KE27CA-AP, P4KE27CA-BP, and P4KE27CA-TP use DO-204AL (DO-41) axial package, matching the original. BZW04-28B uses DO-204AC (DO-15) package and requires different PCB footprint.

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