5KP22 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP22 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole P600 axial package device provides 5000W peak pulse power handling with a 22V reverse standoff voltage and 37.28V maximum clamping voltage. The 5KP22 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	22	V
Voltage - Breakdown (Min)	22.91	V
Voltage - Clamping (Max) @ Ipp	37.28	V
Power - Peak Pulse	5000	W
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Operating Temperature Range	-55 to 175	°C
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the 5KP22 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 22V nominal
Power - Peak Pulse: 5000W minimum
Package / Case: P600 axial (preferred for direct mechanical compatibility)
Unidirectional Channels: 1
Operating Temperature Range: -55°C to 175°C minimum

Secondary Compatibility Factors:

Voltage - Clamping (Max) @ Ipp: 37.28V reference point
Voltage - Breakdown (Min): 22.91V reference point
Mounting Type: Through Hole

Substitute parts are grouped into two categories:

Category A - Direct P600 Package Equivalents: Parts maintaining identical P600 axial package geometry and 5000W power rating. These provide direct mechanical and electrical substitution with minimal circuit redesign.

Category B - Alternative Package Equivalents: Parts with different package geometries (DO-201, DO-15) but compatible electrical specifications. These require mechanical redesign of the circuit board layout but maintain functional voltage and power protection characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ) [V]	Voltage - Breakdown (Min) [V]	Voltage - Clamping (Max) @ Ipp [V]	Current - Peak Pulse (10/1000µs) [A]	Power - Peak Pulse [W]	Package / Case	Product Status
5KP22	Littelfuse Inc.	22	22.91	37.28	—	5000	P600, Axial	Obsolete
5KP22A	Diotec Semiconductor	22	24.4	35.5	141	5000	P600, Axial	Active
SLD22U-017-B	Littelfuse Inc.	22	24.4	35.5	143.7	5000	P600, Axial	Active
5KP22E3/TR13	Microchip Technology	22	24.4	39.4	127	5000	P600, Axial	Active
1.5KE22A	Taiwan Semiconductor Corporation	18.8	20.9	30.6	51	1500	DO-201AA, Axial	Active
1.5KE24A	Taiwan Semiconductor Corporation	20.5	22.8	33.2	47	1500	DO-201AA, Axial	Active
1.5KE27A	Taiwan Semiconductor Corporation	23.1	25.7	37.5	42	1500	DO-201AA, Axial	Active
P6KE24A	Fairchild Semiconductor	20.5	22.8	33.2	19	600	DO-204AC, Axial	Active
P6KE27A	Fairchild Semiconductor	23.1	25.7	37.5	16.8	600	DO-204AC, Axial	Active
SA20A	Fairchild Semiconductor	20	22.2	32.4	15.7	500	DO-204AC, Axial	Obsolete
P4KE22A-TP	Micro Commercial Co	18.8	20.9	30.6	13.4	400	DO-204AL, Axial	Active

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (P600 Package, 5000W Power Rating):

The 5KP22A (Diotec Semiconductor), SLD22U-017-B (Littelfuse Inc.), and 5KP22E3/TR13 (Microchip Technology) are direct functional equivalents. All three maintain the P600 axial package geometry, 5000W peak pulse power rating, and 22V reverse standoff voltage specification. These parts require no circuit board redesign and provide identical mechanical mounting compatibility. The 5KP22A and SLD22U-017-B exhibit clamping voltages of 35.5V, while the 5KP22E3/TR13 specifies 39.4V clamping voltage. All three are active products with current manufacturing status and ROHS3 compliance.

Tier 2 - Functional Substitutes (Alternative Packages, Reduced Power Rating):

The 1.5KE series (1.5KE22A, 1.5KE24A, 1.5KE27A) from Taiwan Semiconductor Corporation and P6KE series (P6KE24A, P6KE27A) from Fairchild Semiconductor provide functional voltage suppression within the 22V to 27V range but with reduced power handling (1500W and 600W respectively). These parts require circuit board layout modification due to different package geometries (DO-201AA and DO-204AC). Selection from this tier is appropriate only when application power dissipation requirements are lower than the original 5000W specification.

Tier 3 - Limited Compatibility:

The SA20A (Fairchild Semiconductor) and P4KE22A-TP (Micro Commercial Co) are classified as limited compatibility options. The SA20A is obsolete with only 500W power rating. The P4KE22A-TP provides 400W power rating in a DO-204AL package. These parts are suitable only for applications with significantly reduced transient energy requirements.

Compliance and Certification:

All active Tier 1 and Tier 2 substitute parts maintain ROHS3 compliance and operating temperature ranges of -55°C to 175°C, matching the original 5KP22 specification. The SLD22U-017-B includes AEC-Q101 automotive qualification, providing additional reliability assurance for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can the 5KP22A directly replace the 5KP22 without circuit modification?

A: Yes. The 5KP22A maintains identical P600 axial package geometry, 5000W power rating, and 22V reverse standoff voltage. No circuit board redesign is required for mechanical or electrical compatibility.

Q: What is the primary difference between Tier 1 and Tier 2 substitute options?

A: Tier 1 substitutes (5KP22A, SLD22U-017-B, 5KP22E3/TR13) maintain the P600 package and 5000W power rating, requiring no circuit modification. Tier 2 substitutes use alternative packages (DO-201AA, DO-204AC) and provide reduced power handling (1500W or 600W), requiring circuit board layout changes.

Q: Can I use a 1.5KE22A in place of the 5KP22 in a high-energy transient environment?

A: The 1.5KE22A provides only 1500W peak pulse power compared to the 5KP22's 5000W rating. Use is limited to applications where transient energy does not exceed 1500W. Higher energy transients may exceed the device's thermal dissipation capability, resulting in failure.

Q: Are all substitute parts ROHS3 compliant?

A: All active Tier 1 and Tier 2 substitute parts are ROHS3 compliant. The SA20A (Tier 3) is ROHS3 compliant but obsolete. Verify compliance documentation with the specific supplier for your procurement source.

Q: What is the significance of the clamping voltage difference between 5KP22A (35.5V) and 5KP22E3/TR13 (39.4V)?

A: Both parts maintain the 22V reverse standoff voltage and 5000W power rating. The clamping voltage difference reflects manufacturing tolerance variations within the TVS diode specification. Selection between these parts depends on the specific circuit's maximum allowable clamping voltage requirement. If the circuit design specifies a maximum clamping voltage below 39.4V, the 5KP22A is the appropriate choice.

Q: Is the SLD22U-017-B suitable for automotive applications?

A: Yes. The SLD22U-017-B includes AEC-Q101 automotive qualification, making it suitable for automotive transient voltage suppression applications. This qualification is not present in the 5KP22A or 5KP22E3/TR13.

Q: What package considerations apply when selecting from Tier 2 alternatives?

A: Tier 2 parts use DO-201AA or DO-204AC packages instead of the P600 package. These require different through-hole pad spacing and lead geometry. Circuit board redesign is necessary, including modification of pad layouts, trace routing, and component placement to accommodate the alternative package dimensions.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message