5KP20C Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The 5KP20C is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This component features a 20V reverse standoff voltage, 5000W peak pulse power rating, and P600 axial through-hole packaging. The 5KP20C is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within the specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	20	V
Voltage - Breakdown (Min)	21.02	V
Voltage - Clamping (Max) @ Ipp	34.02	V
Power - Peak Pulse	5000	W
Bidirectional Channels	1	—
Type	Zener	—
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Operating Temperature	-55 to 175	°C (TJ)
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 5KP20C is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 20V nominal
Voltage - Clamping (Max) @ Ipp: within acceptable range for transient suppression
Power - Peak Pulse: 5000W or higher
Bidirectional operation: 1 channel
Type: Zener diode
Operating Temperature range: -55°C to 175°C minimum
RoHS3 Compliance: required for regulatory alignment

Secondary Compatibility Factors:

Mounting Type: Through Hole (required)
Package options: P600 (preferred), DO-201, or DO-15 (alternative packages with compatible electrical performance)

Substitute parts are grouped into two categories: direct equivalents maintaining P600 packaging, and functional equivalents with alternative packages (DO-201, DO-15) that meet the electrical specifications while offering different form factors.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
5KP20C	Littelfuse Inc.	20V	21.02V	34.02V	—	5000W	P600, Axial	Obsolete	ROHS3 Compliant
5KP20CA	Littelfuse	20V	22.2V	32.4V	157.4A	5000W	P600, Axial	Active	ROHS3 Compliant
SLD20-018-B	Littelfuse Inc.	20V	22.2V	32.4V	157.4A	5000W	P600, Axial	Active	ROHS3 Compliant
5KP20CE3/TR13	Microchip Technology	20V	22.2V	35.8V	140A	5000W	P600, Axial	Active	ROHS3 Compliant
5KP20CA-TP	Micro Commercial Co	20V	22.2V	32.4V	—	5000W	R-6, Axial	Active	ROHS3 Compliant
1.5KE22CA	Taiwan Semiconductor Corporation	18.8V	20.9V	30.6V	51A	1500W	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant
1.5KE27CA	Taiwan Semiconductor Corporation	23.1V	25.7V	37.5V	42A	1500W	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant
P6KE24CA	Fairchild Semiconductor	20.5V	22.8V	33.2V	19A	600W	DO-204AC, DO-15, Axial	Active	—
P6KE27CA	Diotec Semiconductor	23.1V	25.7V	37.5V	16.8A	600W	DO-204AC, DO-15, Axial	Active	ROHS3 Compliant
1N6153	Microchip Technology	22.8V	28.5V	41.6V	36A	1500W	C, Axial	Active	RoHS non-compliant

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Recommended Primary Substitutes):

5KP20CA and SLD20-018-B are functionally identical direct replacements for the 5KP20C. Both maintain the 20V reverse standoff voltage, 5000W power rating, P600 axial packaging, and ROHS3 compliance. 5KP20CA is available in active production status with 4204 units in stock. SLD20-018-B offers automotive-grade qualification (AEC-Q101) and is suitable for applications requiring enhanced reliability standards.

Tier 2 - P600 Package Variants:

5KP20CE3/TR13 (Microchip Technology) maintains P600 packaging and 5000W power rating with a slightly elevated clamping voltage of 35.8V. This part is active and ROHS3 compliant. 5KP20CA-TP (Micro Commercial Co) provides equivalent electrical performance in R-6 axial packaging, suitable for applications where package footprint variation is acceptable.

Tier 3 - Alternative Package Solutions:

1.5KE22CA and 1.5KE27CA (Taiwan Semiconductor Corporation) offer DO-201 axial packaging with reduced power ratings (1500W). These parts are suitable only for applications where peak pulse power requirements do not exceed 1500W. 1.5KE22CA provides closer voltage matching to the original 20V specification.

P6KE24CA and P6KE27CA provide DO-15 (DO-204AC) axial packaging with 600W power ratings. These parts are suitable only for low-power transient suppression applications and are not recommended as primary substitutes due to significantly reduced power handling capability.

Not Recommended:

1N6153 (Microchip Technology) is RoHS non-compliant and does not meet current regulatory requirements for new designs.

Frequently Asked Questions (FAQ)

Q: Can 5KP20CA directly replace 5KP20C without circuit modification?

A: Yes. 5KP20CA is a direct equivalent with identical reverse standoff voltage (20V), peak pulse power (5000W), and P600 axial packaging. No circuit modifications are required.

Q: What is the difference between 5KP20CA and SLD20-018-B?

A: Both parts are electrically equivalent with identical voltage and power specifications. SLD20-018-B carries automotive-grade qualification (AEC-Q101) and is suitable for automotive and high-reliability applications. 5KP20CA is standard industrial grade.

Q: Can I use 1.5KE22CA as a substitute for 5KP20C?

A: 1.5KE22CA is not recommended as a primary substitute. While it maintains similar voltage characteristics, the power rating is reduced to 1500W (versus 5000W for 5KP20C). Use only if application peak pulse power requirements do not exceed 1500W and DO-201 packaging is acceptable.

Q: Why are P6KE24CA and P6KE27CA listed as substitutes if power ratings are only 600W?

A: These parts are listed as functional alternatives for low-power transient suppression applications only. They are not suitable for applications requiring the full 5000W power handling of the original 5KP20C.

Q: Is RoHS3 compliance required for my application?

A: RoHS3 compliance is mandatory for products sold in the European Union and many other regulated markets. All recommended Tier 1 and Tier 2 substitutes are ROHS3 compliant. 1N6153 is RoHS non-compliant and should not be used in new designs.

Q: Can I substitute 5KP20CA-TP for 5KP20C?

A: 5KP20CA-TP is electrically equivalent but uses R-6 axial packaging instead of P600. Substitution is possible if the circuit board layout accommodates R-6 package dimensions. Verify mechanical compatibility before implementation.

Q: What is the difference between P600 and DO-201 packaging?

A: P600 and DO-201 are both axial through-hole packages with different physical dimensions. P600 is larger and typically used for higher power applications. DO-201 is smaller. Substitution between packages requires verification of circuit board layout and thermal management requirements.

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