5KP22A-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP22A-B is a unidirectional Zener transient voltage suppressor manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This through-hole P600 package device provides 5000W peak pulse power handling with a 22V reverse standoff voltage and 35.5V maximum clamping voltage. The part is currently active in production with full RoHS3 compliance.

Substitute parts are identified based on matching electrical characteristics (reverse standoff voltage, clamping voltage, peak pulse current, and power rating) while accommodating different package formats and manufacturer implementations. Alternative sources ensure design flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	22	V
Voltage - Breakdown (Min)	24	V
Voltage - Clamping (Max) @ Ipp	35.5	V
Current - Peak Pulse (10/1000µs)	143.7	A
Power - Peak Pulse	5000	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package / Case	P600, Axial	—
Mounting Type	Through Hole	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the 5KP22A-B is determined by the following electrical and mechanical criteria:

Primary Matching Criteria:

Reverse standoff voltage within the 22V nominal range
Clamping voltage (Max) @ Ipp between 30.6V and 37.5V
Peak pulse current capability of 42A or greater
Power dissipation rating of 1500W minimum
Unidirectional Zener diode topology
Through-hole axial mounting configuration
Operating temperature range of -50°C to 175°C or better

Package Considerations: Substitutes are available in three package formats: P600 (direct mechanical equivalent), DO-201 (larger footprint, higher current handling), and DO-15/DO-204AC (compact format, lower current rating). Package selection depends on PCB layout constraints and thermal management requirements.

Voltage Tolerance: Reverse standoff voltages of 18.8V to 23.1V are acceptable within the 22V nominal specification, as these fall within standard TVS diode tolerance bands and maintain circuit protection objectives.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
5KP22A-B	Littelfuse	22V	35.5V	143.7A	5000W	P600, Axial	-55 to 175°C	Active
5KP22A	Diotec Semiconductor	22V	35.5V	141A	5000W	P600, Axial	-50 to 175°C	Active
1.5KE22A	Taiwan Semiconductor Corporation	18.8V	30.6V	51A	1500W	DO-201AA, DO-27, Axial	-55 to 175°C	Active
1.5KE24A	Taiwan Semiconductor Corporation	20.5V	33.2V	47A	1500W	DO-201AA, DO-27, Axial	-55 to 175°C	Active
1.5KE27A	Taiwan Semiconductor Corporation	23.1V	37.5V	42A	1500W	DO-201AA, DO-27, Axial	-55 to 175°C	Active
P6KE22A	Fairchild Semiconductor	18.8V	30.6V	20A	600W	DO-204AC, DO-15, Axial	-50 to 175°C	Active
P6KE24A	Fairchild Semiconductor	20.5V	33.2V	19A	600W	DO-204AC, DO-15, Axial	-50 to 175°C	Active
P6KE27A	Fairchild Semiconductor	23.1V	37.5V	16.8A	600W	DO-204AC, DO-15, Axial	-50 to 175°C	Active
SA20A	Fairchild Semiconductor	20V	32.4V	15.7A	500W	DO-204AC, DO-15, Axial	-55 to 175°C	Obsolete

Engineering Selection Recommendations

Direct Equivalent (Same Package, Same Power Rating): The 5KP22A from Diotec Semiconductor is the closest substitute, offering identical P600 package format and 5000W power dissipation with matching 22V reverse standoff and 35.5V clamping specifications. This part maintains full compatibility with existing PCB layouts and thermal management designs. Both Littelfuse and Diotec versions are active products with current manufacturing support.

Alternative Voltage Ratings (Same Package, Same Power Rating): The 5KP series from Littelfuse includes variants at different voltage ratings. If circuit requirements permit voltage tolerance, the 5KP22A remains the primary selection within this series.

Reduced Power Rating Substitutes (DO-201 Package): The 1.5KE series from Taiwan Semiconductor Corporation provides 1500W power handling in the larger DO-201 package. These parts are suitable for applications where peak pulse current requirements are lower than 143.7A. The 1.5KE22A, 1.5KE24A, and 1.5KE27A maintain voltage compatibility across the 18.8V to 23.1V range. All three variants are active products with high inventory availability.

Compact Package Substitutes (DO-15 Package): The P6KE series from Fairchild Semiconductor and SA20A provide 600W power handling in the compact DO-15 (DO-204AC) package. These parts are limited to peak pulse currents of 16.8A to 20A and are suitable only for low-energy transient suppression applications. The P6KE series remains active; the SA20A is obsolete and should not be selected for new designs.

Compliance and Certifications: All active substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the environmental and regulatory requirements of the 5KP22A-B. Temperature operating ranges of -50°C to 175°C or -55°C to 175°C are functionally equivalent for most industrial applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 1.5KE22A in place of the 5KP22A-B? A: The 1.5KE22A is electrically compatible for voltage protection (18.8V standoff, 30.6V clamping) but has reduced power handling (1500W vs. 5000W) and lower peak pulse current (51A vs. 143.7A). Substitution is valid only if your circuit's transient energy is below 1500W and peak current does not exceed 51A. The DO-201 package is physically larger than P600.

Q: What is the difference between the 5KP22A and 5KP22A-B? A: The 5KP22A-B is the Littelfuse variant with identical electrical specifications. The suffix "-B" indicates Littelfuse's internal designation. The Diotec 5KP22A is a separate manufacturer's equivalent with matching performance.

Q: Why would I choose a P6KE series part over the 1.5KE series? A: The P6KE series uses the compact DO-15 package, which occupies less PCB space than DO-201. However, power handling is reduced to 600W and peak current to 16.8A–20A. Selection depends on available board space and transient energy requirements. The P6KE series is not recommended for high-energy applications.

Q: Is the SA20A still available for new designs? A: No. The SA20A is obsolete and should not be selected for new product designs. Use active alternatives such as the P6KE22A, 1.5KE22A, or 5KP22A instead.

Q: Can I substitute a 1.5KE27A for the 5KP22A-B? A: The 1.5KE27A has a higher reverse standoff voltage (23.1V) and clamping voltage (37.5V), which shifts the protection threshold upward. This substitution is valid only if your circuit can tolerate the higher clamping voltage. Power handling remains limited to 1500W.

Q: What package format should I choose for a new design? A: For maximum transient energy handling (5000W, 143.7A peak), use the P600 package (5KP22A or 5KP22A-B). For moderate energy applications (1500W, 42A–51A peak), use DO-201 (1.5KE series). For compact, low-energy designs (600W, 16.8A–20A peak), use DO-15 (P6KE series). Package selection must align with your circuit's peak pulse current and energy requirements.

Q: Are all substitute parts RoHS3 compliant? A: All active substitute parts listed (5KP22A, 1.5KE22A, 1.5KE24A, 1.5KE27A, P6KE22A, P6KE24A, P6KE27A) are RoHS3 compliant. The obsolete SA20A is also RoHS3 compliant but should not be used in new designs.

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