5KP22C Equivalent & Substitute Parts

Part Overview

The 5KP22C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 22V reverse standoff voltage with 5000W peak pulse power dissipation. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The 5KP22C operates across a temperature range of -55°C to 175°C and is housed in a P600 axial through-hole package. Substitute parts must maintain functional equivalence in voltage clamping, power handling, and thermal performance while accommodating available product status and packaging options.

Key Parameters

Parameter	5KP22C Value	Unit
Voltage - Reverse Standoff (Typ)	22V	V
Voltage - Breakdown (Min)	22.91V	V
Voltage - Clamping (Max) @ Ipp	37.28V	V
Power - Peak Pulse	5000W	W
Type	Zener	—
Bidirectional Channels	1	—
Operating Temperature	-55°C ~ 175°C	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 5KP22C is determined by the following critical parameters: reverse standoff voltage (22V nominal), voltage clamping performance (maximum 37.28V @ Ipp), peak pulse power rating (5000W), bidirectional operation, and through-hole axial mounting. Substitute parts are grouped into three categories based on these criteria:

Category 1: Direct Voltage & Power Match (P600 Package) Parts maintaining 22V standoff voltage, 5000W power rating, and P600 package form factor. These provide the closest functional and mechanical equivalence.

Category 2: Voltage-Compatible Alternatives (Reduced Power Rating) Parts with compatible voltage clamping characteristics but lower power ratings (1500W or 600W). These are suitable for applications where peak pulse power requirements are less stringent than the original 5000W specification.

Category 3: Voltage-Compatible Alternatives (Different Package) Parts with compatible voltage characteristics but different package geometries (DO-201, DO-204AL, DO-15). These require mechanical redesign but maintain electrical performance within acceptable parameters.

Substitution logic is based strictly on: (1) reverse standoff voltage tolerance, (2) voltage clamping maximum values, (3) power dissipation capability, (4) bidirectional operation, and (5) operating temperature range. All substitute parts listed maintain -55°C to 175°C operating temperature and ROHS3 compliance.

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
5KP22C	Littelfuse Inc.	22V	22.91V	37.28V	—	5000W	P600, Axial	Obsolete
5KP22CA	Littelfuse Inc.	22V	24V	35.5V	143.7A	5000W	P600, Axial	Active
5KP20CA	Littelfuse	20V	22.2V	32.4V	157.4A	5000W	P600, Axial	Active
1.5KE22CA	Taiwan Semiconductor Corporation	18.8V	20.9V	30.6V	51A	1500W	DO-201AA, DO-27, Axial	Active
1.5KE24CA	Taiwan Semiconductor Corporation	20.5V	22.8V	33.2V	47A	1500W	DO-201AA, DO-27, Axial	Active
1.5KE27CA	Taiwan Semiconductor Corporation	23.1V	25.7V	37.5V	42A	1500W	DO-201AA, DO-27, Axial	Active
P4KE22CA	Taiwan Semiconductor Corporation	18.8V	20.9V	30.6V	13.7A	400W	DO-204AL, DO-41, Axial	Active
P4KE24CA	Taiwan Semiconductor Corporation	20.5V	22.8V	33.2V	12.6A	400W	DO-204AL, DO-41, Axial	Active
P4KE27CA	Taiwan Semiconductor Corporation	23.1V	25.7V	37.5V	11A	400W	DO-204AL, DO-41, Axial	Active
P6KE22CA	Diotec Semiconductor	18.8V	20.9V	30.6V	20A	600W	DO-204AC, DO-15, Axial	Active
P6KE24CA	Fairchild Semiconductor	20.5V	22.8V	33.2V	19A	600W	DO-204AC, DO-15, Axial	Active

Engineering Selection Recommendations

Primary Substitute: 5KP22CA The 5KP22CA is the direct active-status equivalent of the 5KP22C. Both parts share identical reverse standoff voltage (22V), power rating (5000W), package form factor (P600 axial), and operating temperature range (-55°C to 175°C). The 5KP22CA maintains ROHS3 compliance and is currently in active production status. This part requires no design modifications and provides complete functional equivalence.

Secondary Substitute: 5KP20CA The 5KP20CA maintains the same 5000W power rating and P600 package as the original part. The 20V reverse standoff voltage is lower than the 5KP22C specification, resulting in lower voltage clamping (32.4V maximum versus 37.28V). This part is suitable for applications where the lower voltage threshold is acceptable and provides identical mechanical compatibility.

Alternative Substitutes (Reduced Power Rating) The 1.5KE series (1.5KE22CA, 1.5KE24CA, 1.5KE27CA) and P4KE series (P4KE22CA, P4KE24CA, P4KE27CA) provide voltage-compatible alternatives with reduced power dissipation ratings (1500W and 400W respectively). These parts are appropriate for applications where peak pulse power requirements are lower than 5000W. The P6KE series (P6KE22CA, P6KE24CA) offers 600W power rating with compatible voltage characteristics.

All substitute parts listed maintain ROHS3 compliance and active production status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the 5KP22CA directly replace the 5KP22C without PCB modifications? A: Yes. The 5KP22CA is mechanically and electrically equivalent to the 5KP22C. Both use the P600 axial through-hole package with identical pin spacing and mounting requirements. No PCB layout changes are necessary.

Q: What is the primary difference between the 5KP22C and lower-power alternatives like the 1.5KE22CA? A: The 5KP22C is rated for 5000W peak pulse power dissipation, while the 1.5KE22CA is rated for 1500W. The 1.5KE22CA also uses a different package (DO-201 instead of P600). Selection depends on the application's peak pulse power requirements. If your circuit requires less than 1500W dissipation, the 1.5KE22CA is suitable; otherwise, maintain the 5000W-rated part.

Q: Are the P4KE and P6KE series suitable replacements for the 5KP22C? A: The P4KE and P6KE series provide voltage-compatible alternatives but with significantly reduced power ratings (400W and 600W respectively). These parts are suitable only for applications where peak pulse power dissipation does not exceed their rated values. They require different package footprints (DO-204AL for P4KE, DO-15 for P6KE), necessitating PCB redesign.

Q: What voltage tolerance should I consider when selecting a substitute? A: The 5KP22C has a 22V reverse standoff voltage. Substitutes with standoff voltages between 20V and 23.1V maintain functional compatibility for general-purpose transient suppression. Parts with 18.8V standoff voltage (1.5KE22CA, P4KE22CA, P6KE22CA) operate at lower voltage thresholds and are suitable if your circuit can tolerate earlier clamping action.

Q: Does package selection affect electrical performance? A: Package selection does not affect electrical performance but impacts mechanical integration. The P600 package (5KP22C, 5KP22CA, 5KP20CA) is axial with specific lead spacing. The DO-201, DO-204AL, and DO-15 packages have different physical dimensions and lead configurations. Substitution to a different package requires PCB layout verification to ensure proper mounting and thermal management.

Q: Are all listed substitutes ROHS3 compliant? A: Yes. All substitute parts listed in this document maintain ROHS3 compliance, consistent with the original 5KP22C specification.

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