Equivalent & Substitute Parts for 5KP20C-B

Part Overview

The 5KP20C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 20V reverse standoff with a 5000W peak pulse power rating. This bidirectional Zener diode is designed for general-purpose transient voltage suppression in through-hole P600 axial package configuration. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	5KP20C-B
Manufacturer	Littelfuse Inc.
Part Number	5KP20C-B
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	20V
Voltage - Breakdown (Min)	21.02V
Voltage - Clamping (Max) @ Ipp	34.02V
Power - Peak Pulse	5000W (5kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 5KP20C-B is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 20V nominal rating
Voltage - Clamping (Max) @ Ipp: Maximum allowable clamping voltage
Power - Peak Pulse: 5000W (5kW) rating
Bidirectional Channels: Single channel configuration
Mounting Type: Through Hole
Operating Temperature Range: -55°C ~ 175°C (TJ)
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories based on package compatibility:

Category 1: P600 Axial Package (Direct Package Match) Parts maintaining the P600 axial package provide direct mechanical and electrical compatibility with existing PCB layouts and footprints.

Category 2: Alternative Packages (DO-15, DO-201) Parts with different package configurations (DO-15, DO-201) provide electrical equivalence but require PCB layout modification and footprint changes.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
5KP20C-B	Littelfuse Inc.	20V	21.02V	34.02V	5000W	P600, Axial	Obsolete	ROHS3 Compliant
5KP20CA	Littelfuse	20V	22.2V	32.4V	5000W	P600, Axial	Active	ROHS3 Compliant
5KP20CA-B	Littelfuse Inc.	20V	22.2V	32.4V	5000W	P600, Axial	Active	ROHS3 Compliant
SLD20-018-B	Littelfuse Inc.	20V	22.2V	32.4V	5000W	P600, Axial	Active	ROHS3 Compliant
5KP20CA-TP	Micro Commercial Co	20V	22.2V	32.4V	5000W	R-6, Axial	Active	ROHS3 Compliant
5KP20CE3/TR13	Microchip Technology	20V	22.2V	35.8V	5000W	P600, Axial	Active	ROHS3 Compliant
1.5KE22CA	Taiwan Semiconductor Corporation	18.8V	20.9V	30.6V	1500W	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant
1.5KE27CA	Taiwan Semiconductor Corporation	23.1V	25.7V	37.5V	1500W	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant
P6KE24CA	Fairchild Semiconductor	20.5V	22.8V	33.2V	600W	DO-204AC, DO-15, Axial	Active	Not specified
P6KE27CA	Diotec Semiconductor	23.1V	25.7V	37.5V	600W	DO-204AC, DO-15, Axial	Active	ROHS3 Compliant
1N6153	Microchip Technology	22.8V	28.5V	41.6V	1500W	C, Axial	Active	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitutes (P600 Package, 5000W Rating, Active Status)

5KP20CA and 5KP20CA-B are direct active replacements for the obsolete 5KP20C-B. Both maintain identical reverse standoff voltage (20V), P600 axial package configuration, and 5000W peak pulse power rating. Clamping voltage is reduced from 34.02V to 32.4V, which remains within acceptable suppression parameters. Both parts are ROHS3 compliant and manufactured by Littelfuse Inc.

SLD20-018-B provides equivalent electrical performance with identical clamping voltage (32.4V) and power rating (5000W). This part carries AEC-Q101 automotive qualification and is suitable for applications requiring automotive-grade components.

5KP20CE3/TR13 maintains the P600 package and 5000W power rating with slightly elevated clamping voltage (35.8V). This part is supplied in Tape & Reel packaging and is manufactured by Microchip Technology.

Secondary Substitutes (Alternative Packages, Reduced Power Rating)

1.5KE22CA and 1.5KE27CA are lower power alternatives (1500W) in DO-201 package. These parts are suitable only for applications where peak pulse power requirements do not exceed 1500W. Voltage ratings differ from the original part.

P6KE24CA and P6KE27CA are 600W alternatives in DO-15 package. These parts are suitable only for low-power applications and require significant PCB layout modification.

1N6153 is a 1500W alternative with non-compliant RoHS status. This part is not recommended for new designs requiring RoHS compliance.

Recommendation for Obsolete Part Replacement

For direct replacement without design modification, select 5KP20CA or 5KP20CA-B. Both are active, ROHS3 compliant, and maintain full electrical and mechanical compatibility with the original 5KP20C-B specification.

Frequently Asked Questions (FAQ)

Q: Can 5KP20CA directly replace 5KP20C-B without PCB modification?

A: Yes. Both parts use the P600 axial package and maintain identical reverse standoff voltage (20V) and peak pulse power rating (5000W). The clamping voltage difference (32.4V vs 34.02V) is within acceptable suppression tolerance. No PCB layout changes are required.

Q: What is the difference between 5KP20CA and 5KP20CA-B?

A: Both parts have identical electrical specifications. The difference is packaging: 5KP20CA is supplied in Cut Tape (CT), while 5KP20CA-B is supplied in Bulk. Selection depends on procurement and handling requirements.

Q: Why is SLD20-018-B listed as a substitute if it has different electrical characteristics?

A: SLD20-018-B maintains the critical parameters for substitution: 20V reverse standoff, 32.4V clamping voltage, 5000W power rating, and P600 package. The automotive qualification (AEC-Q101) makes it suitable for applications requiring automotive-grade components.

Q: Can lower power alternatives like 1.5KE22CA be used as substitutes?

A: Only if the application's peak pulse power requirement does not exceed 1500W. The 1.5KE22CA has reduced power rating (1500W vs 5000W) and different voltage characteristics. PCB layout modification is required due to DO-201 package incompatibility with P600 footprints.

Q: Is 1N6153 a viable substitute despite RoHS non-compliance?

A: 1N6153 is not recommended for new designs. It is RoHS non-compliant and has significantly higher clamping voltage (41.6V vs 34.02V), which may exceed circuit protection requirements. Use only in legacy applications where RoHS compliance is not mandated.

Q: What are the package compatibility considerations?

A: P600 and R-6 packages are mechanically similar axial configurations. DO-15 and DO-201 packages require different PCB footprints and cannot be used as drop-in replacements without layout redesign. Verify footprint compatibility before selecting alternative package options.

Q: How do voltage ratings affect substitution suitability?

A: Reverse standoff voltage (20V nominal) must remain consistent for circuit protection function. Clamping voltage variations (30.6V to 41.6V range) affect transient suppression effectiveness. Select substitutes with clamping voltage within ±10% of original specification for optimal performance.

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