P4KE11 Equivalent & Substitute Parts

Part Overview

The P4KE11 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This component features a 9.4V reverse standoff voltage and 400W peak pulse power rating in a DO-204AL (DO-41) axial package. The P4KE11 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage clamping, peak pulse current, and thermal operating ranges while supporting the same through-hole mounting configuration.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	9.4	V
Voltage - Breakdown (Min)	9.95	V
Voltage - Clamping (Max) @ Ipp	16.38	V
Current - Peak Pulse (10/1000µs)	26.3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitute parts for the P4KE11 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 9.4V
Unidirectional Channels: 1
Mounting Type: Through Hole
Package / Case: DO-204AL or DO-41 (Axial)
Power - Peak Pulse: 400W
Type: Zener

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: Within acceptable circuit protection margins
Current - Peak Pulse (10/1000µs): Minimum 25.64A to maintain 400W power rating
Operating Temperature Range: Minimum -55°C to 150°C acceptable for general-purpose applications

Two active substitute parts meet these criteria: P4KE11A (Taiwan Semiconductor Corporation) and P4KE11A-G (Comchip Technology). Both maintain the 9.4V standoff voltage, 400W power rating, and through-hole DO-41 package configuration required for direct substitution.

Parameter Comparison

Parameter	P4KE11 (Littelfuse)	P4KE11A (Taiwan Semiconductor)	P4KE11A-G (Comchip)	Unit
Voltage - Reverse Standoff (Typ)	9.4	9.4	9.4	V
Voltage - Breakdown (Min)	9.95	10.5	10.45	V
Voltage - Clamping (Max) @ Ipp	16.38	15.6	15.6	V
Current - Peak Pulse (10/1000µs)	26.3	27	25.64	A
Power - Peak Pulse	400	400	400	W
Operating Temperature Range	-55 to 175	-55 to 175	-55 to 150	°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	-
Package / Case	DO-204AL, DO-41	DO-204AL, DO-41	DO-41	-
Type	Zener	Zener	Zener	-
Unidirectional Channels	1	1	1	-
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-
Product Status	Obsolete	Active	Active	-

Engineering Selection Recommendations

P4KE11A (Taiwan Semiconductor Corporation) is the primary substitute for the obsolete P4KE11. This part maintains full electrical equivalence with identical reverse standoff voltage (9.4V), peak pulse power (400W), and operating temperature range (-55°C to 175°C). The voltage clamping is reduced to 15.6V with peak pulse current of 27A, both within acceptable protection margins. Product status is active with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Packaging is available in Tape & Reel format, supporting automated assembly processes.

P4KE11A-G (Comchip Technology) is an alternative substitute with equivalent electrical performance for general-purpose applications. This part matches the 9.4V standoff voltage and 400W power rating with 15.6V clamping voltage and 25.64A peak pulse current. Operating temperature range is -55°C to 150°C, which is acceptable for applications not requiring the full 175°C upper limit. Product status is active with ROHS3 compliance. Packaging is supplied in bulk format. The DO-41 package configuration is compatible with through-hole mounting requirements.

Both substitutes are ROHS3 compliant and carry EAR99 ECCN classification, matching the regulatory status of the original P4KE11.

Frequently Asked Questions (FAQ)

Q: Can P4KE11A and P4KE11A-G be used interchangeably with the P4KE11?

A: Both parts are electrically compatible substitutes. The P4KE11A and P4KE11A-G maintain the critical 9.4V reverse standoff voltage and 400W peak pulse power rating. Voltage clamping is reduced to 15.6V in both substitutes, which provides equivalent circuit protection. Peak pulse current specifications (27A for P4KE11A, 25.64A for P4KE11A-G) support the 400W power rating. Selection between the two depends on packaging requirements and operating temperature limits.

Q: What is the difference in voltage clamping between the P4KE11 and its substitutes?

A: The P4KE11 specifies a maximum clamping voltage of 16.38V at peak pulse current. Both P4KE11A and P4KE11A-G reduce this to 15.6V. This lower clamping voltage provides improved transient suppression performance and is acceptable for general-purpose overvoltage protection applications.

Q: Are there temperature operating range differences between the substitutes?

A: The P4KE11 and P4KE11A both support -55°C to 175°C operating temperature range. The P4KE11A-G operates from -55°C to 150°C. For applications requiring operation above 150°C, the P4KE11A is the appropriate choice.

Q: What packaging formats are available for these substitutes?

A: The P4KE11A is supplied in Tape & Reel (TR) format, suitable for automated pick-and-place assembly. The P4KE11A-G is supplied in bulk format. Both use the DO-204AL (DO-41) axial through-hole package configuration, ensuring mechanical compatibility with existing PCB designs.

Q: Do the substitutes maintain RoHS compliance?

A: Both P4KE11A and P4KE11A-G are ROHS3 compliant, matching the regulatory status of the original P4KE11. Moisture sensitivity level is MSL 1 (Unlimited) for both parts.

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