P6KE18 Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The P6KE18 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc. in DO-204AC (DO-15) axial package configuration. This component is designed for general-purpose transient voltage suppression applications with a peak pulse power rating of 600W and reverse standoff voltage of 15.3V. The P6KE18 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing circuit protection requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	15.3V
Voltage - Breakdown (Min)	16.2V
Voltage - Clamping (Max) @ Ipp	26.46V
Power - Peak Pulse	600W
Type	Zener
Unidirectional Channels	1
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Operating Temperature Range	-55°C ~ 175°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the P6KE18 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Reverse standoff voltage: 15.3V (Typ)
Breakdown voltage minimum: 16.2V or higher
Clamping voltage maximum @ Ipp: 25.2V to 26.46V range
Peak pulse power: 600W
Package type: DO-204AC (DO-15) axial through-hole
Unidirectional configuration: 1 channel
Zener diode type

All identified substitute parts meet these electrical specifications within the allowed parameter tolerances. The substitute parts P6KE18A (Fairchild Semiconductor), P6KE18A-G (Comchip Technology), and P6KE18A-HF (Comchip Technology) maintain functional equivalence for transient voltage suppression in the 15.3V standoff voltage class.

Parameter Comparison

Parameter	P6KE18 (Littelfuse)	P6KE18A (Fairchild)	P6KE18A-G (Comchip)	P6KE18A-HF (Comchip)
Voltage - Reverse Standoff (Typ)	15.3V	15.3V	15.3V	15.3V
Voltage - Breakdown (Min)	16.2V	17.1V	17.1V	17.1V
Voltage - Clamping (Max) @ Ipp	26.46V	25.2V	25.2V	25.2V
Current - Peak Pulse (10/1000µs)	Not specified	25A	23.81A	23.81A
Power - Peak Pulse	600W	600W	600W	600W
Type	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1
Operating Temperature Range	-55°C ~ 175°C	-50°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

P6KE18A (Fairchild Semiconductor): Active product status with full 600W peak pulse power rating and 25A peak pulse current specification. Operating temperature range of -50°C to 175°C covers most industrial applications, with upper temperature limit matching the original P6KE18. Clamping voltage of 25.2V is within acceptable range for 15.3V standoff voltage class devices.

P6KE18A-G (Comchip Technology): Active product with ROHS3 compliance certification. Operates across -55°C to 150°C temperature range, providing lower temperature performance matching the original part but with reduced upper temperature limit to 150°C. Peak pulse current of 23.81A and clamping voltage of 25.2V maintain electrical equivalence. Tape & Box packaging available.

P6KE18A-HF (Comchip Technology): Active product with ROHS3 compliance certification. Identical electrical specifications to P6KE18A-G with operating temperature range of -55°C to 150°C. Peak pulse current of 23.81A and clamping voltage of 25.2V provide functional equivalence. Tape & Box packaging available.

Selection between substitute parts depends on specific application temperature requirements and packaging preferences. All three substitute parts maintain the critical electrical parameters for transient voltage suppression in the 15.3V standoff voltage class.

Frequently Asked Questions (FAQ)

Q: Can P6KE18A, P6KE18A-G, and P6KE18A-HF be used interchangeably with P6KE18?

A: Yes, within the constraints of operating temperature range. All substitute parts maintain the same reverse standoff voltage (15.3V), peak pulse power (600W), and DO-204AC (DO-15) axial package configuration. The P6KE18A from Fairchild extends to 175°C maximum junction temperature, matching the original P6KE18. The Comchip variants (P6KE18A-G and P6KE18A-HF) operate to 150°C maximum, which may limit use in high-temperature applications.

Q: What are the key electrical differences between the substitute parts?

A: The primary difference is clamping voltage specification. The original P6KE18 specifies 26.46V maximum clamping voltage, while all substitute parts specify 25.2V maximum clamping voltage. This represents a lower clamping voltage, which provides improved transient suppression performance. Peak pulse current ratings vary slightly: Fairchild P6KE18A specifies 25A, while Comchip variants specify 23.81A. All maintain 600W peak pulse power rating.

Q: Are all substitute parts RoHS compliant?

A: The Comchip variants P6KE18A-G and P6KE18A-HF are explicitly ROHS3 compliant. The Fairchild P6KE18A RoHS status is not specified in the provided data. The original P6KE18 is ROHS3 compliant.

Q: What packaging options are available for substitute parts?

A: The Fairchild P6KE18A packaging is not specified. The Comchip variants P6KE18A-G and P6KE18A-HF are available in Tape & Box (TB) packaging. All parts maintain the DO-204AC (DO-15) axial through-hole package configuration for direct mechanical compatibility.

Q: Which substitute part should be selected for applications requiring maximum temperature operation?

A: The Fairchild P6KE18A is the appropriate selection for applications requiring operation up to 175°C junction temperature, matching the original P6KE18 specification. The Comchip variants are limited to 150°C maximum junction temperature.

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