5KP20CA-B Equivalent & Substitute Parts

Part Overview

The 5KP20CA-B is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component features a 20V reverse standoff voltage, 32.4V maximum clamping voltage, and 5000W peak pulse power rating in a P600 axial package. The part is currently active and in stock with 1059 units available. Equivalent and substitute parts are identified based on matching electrical performance parameters and compatible package configurations for applications requiring TVS protection in the 20V to 27V operating range.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	20V	V
Voltage - Breakdown (Min)	22.2V	V
Voltage - Clamping (Max) @ Ipp	32.4V	V
Current - Peak Pulse (10/1000µs)	157.4A	A
Power - Peak Pulse	5000W	W
Bidirectional Channels	1	—
Operating Temperature Range	-55°C to 175°C	°C
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the 5KP20CA-B is determined by the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 18.8V to 23.1V
Voltage - Clamping (Max) @ Ipp: 30.6V to 37.5V
Bidirectional operation (1 channel)
Through-hole axial mounting
Operating temperature range: -55°C to 175°C minimum
RoHS3 compliance
General-purpose TVS application classification

Package Compatibility: Substitutes are grouped into two categories based on package type: P600/R-6 axial packages (direct mechanical replacement) and DO-201/DO-15 axial packages (electrical equivalents with different form factors).

Power Rating Consideration: The 5KP20CA-B operates at 5000W peak pulse power. Substitutes with lower power ratings (1500W or 600W) are listed as electrical equivalents but represent reduced transient energy handling capacity.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	RoHS Status
5KP20CA-B	Littelfuse Inc.	20V	32.4V	157.4A	5000W	P600, Axial	ROHS3 Compliant
5KP20CA	Littelfuse	20V	32.4V	157.4A	5000W	P600, Axial	ROHS3 Compliant
5KP20CA-TP	Micro Commercial Co	20V	32.4V	—	5000W	R-6, Axial	ROHS3 Compliant
1.5KE22CA	Taiwan Semiconductor Corporation	18.8V	30.6V	51A	1500W	DO-201AA, Axial	ROHS3 Compliant
1.5KE27CA	Taiwan Semiconductor Corporation	23.1V	37.5V	42A	1500W	DO-201AA, Axial	ROHS3 Compliant
P6KE24CA	Fairchild Semiconductor	20.5V	33.2V	19A	600W	DO-204AC, Axial	—
P6KE27CA	Diotec Semiconductor	23.1V	37.5V	16.8A	600W	DO-204AC, Axial	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical and Mechanical Performance):

5KP20CA (Littelfuse, Cut Tape packaging): Identical specifications to 5KP20CA-B with 4204 units in stock. Suitable for direct replacement in all applications.
5KP20CA-TP (Micro Commercial Co, R-6 package): Maintains 5000W power rating and 20V standoff voltage. R-6 package is mechanically compatible with P600 footprints in most through-hole applications.

Electrical Equivalents with Reduced Power Handling:

1.5KE22CA (Taiwan Semiconductor Corporation): 1500W power rating with 18.8V standoff voltage and 30.6V clamping. Suitable for lower-energy transient environments. 5050 units in stock.
1.5KE27CA (Taiwan Semiconductor Corporation): 1500W power rating with 23.1V standoff voltage and 37.5V clamping. 1110 units in stock.
P6KE24CA (Fairchild Semiconductor): 600W power rating with 20.5V standoff voltage. 80200 units in stock. Lowest power capacity; suitable only for minimal transient energy applications.
P6KE27CA (Diotec Semiconductor): 600W power rating with 23.1V standoff voltage and 37.5V clamping. 17400 units in stock. ROHS3 compliant.

All substitute parts maintain bidirectional operation, through-hole mounting, and general-purpose TVS classification. Selection should prioritize power rating requirements and available inventory for the specific application.

Frequently Asked Questions (FAQ)

Q: Can 1.5KE22CA or 1.5KE27CA replace 5KP20CA-B in high-energy transient applications? A: No. The 1.5KE series has a 1500W peak pulse power rating compared to 5000W for the 5KP20CA-B. Use these substitutes only in applications with confirmed lower transient energy levels.

Q: What is the difference between P600 and R-6 packages? A: Both are axial through-hole packages with similar mechanical footprints. The 5KP20CA-TP in R-6 package is mechanically compatible with P600 mounting in most PCB designs, though specific board layout should be verified.

Q: Are DO-201 and DO-15 packages compatible with P600 footprints? A: DO-201 and DO-15 are axial packages with different physical dimensions than P600. While all are through-hole axial components, PCB footprint compatibility must be verified before substitution. These represent electrical equivalents rather than direct mechanical replacements.

Q: Which substitute has the highest inventory availability? A: P6KE24CA (Fairchild Semiconductor) has 80200 units in stock, followed by P6KE27CA with 17400 units. However, inventory levels do not determine suitability; power rating and voltage specifications must match application requirements.

Q: Do all substitutes meet RoHS3 compliance? A: 5KP20CA, 5KP20CA-TP, 1.5KE22CA, 1.5KE27CA, and P6KE27CA are ROHS3 compliant. P6KE24CA compliance status is not specified in available data.

Q: What is the operating temperature range for all substitutes? A: 5KP20CA-B, 5KP20CA, 5KP20CA-TP, 1.5KE22CA, and 1.5KE27CA operate from -55°C to 175°C. P6KE24CA and P6KE27CA operate from -50°C to 175°C, with a 5°C minimum temperature difference.

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