5KP20A-B Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 5KP20A-B is an active unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component operates across a temperature range of -55°C to 175°C and is ROHS3 compliant. The part is currently in active production status with 869 units in stock. Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and operational specifications to ensure seamless integration in circuit designs requiring TVS protection.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the 5KP20A-B are categorized based on three primary substitution criteria:

Criterion 1: Voltage Compatibility - Reverse standoff voltage and clamping voltage must fall within acceptable operating ranges. The 5KP20A-B operates at 20V standoff with 32.4V maximum clamping. Substitutes are grouped by voltage rating: 20V-class (5KP20A), 22V-class (1.5KE22A, P6KE22A), 24V-class (1.5KE24A, P4KE24A, P6KE24A), and 27V-class (1.5KE27A, P4KE27A).

Criterion 2: Power Dissipation Rating - Peak pulse power determines thermal capability. The 5KP20A-B dissipates 5000W. Substitutes are grouped into three power classes: 5000W (5KP20A, 5KP22A), 1500W (1.5KE series), and 400-600W (P4KE and P6KE series).

Criterion 3: Package and Current Handling - Physical package (P600, DO-201, DO-204AL, DO-15) and peak pulse current capacity determine mechanical and electrical compatibility. The 5KP20A-B uses P600 package with 157.4A peak pulse current.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package / Case	Operating Temp (°C)	RoHS Status
5KP20A-B	Littelfuse Inc.	20	32.4	157.4	5000	P600, Axial	-55 to 175	ROHS3 Compliant
5KP20A	Diotec Semiconductor	20	32.4	154	5000	P600, Axial	-50 to 175	ROHS3 Compliant
5KP22A	Diotec Semiconductor	22	35.5	141	5000	P600, Axial	-50 to 175	Not applicable
1.5KE22A	Taiwan Semiconductor Corporation	18.8	30.6	51	1500	DO-201AA, DO-27, Axial	-55 to 175	ROHS3 Compliant
1.5KE24A	Taiwan Semiconductor Corporation	20.5	33.2	47	1500	DO-201AA, DO-27, Axial	-55 to 175	ROHS3 Compliant
1.5KE27A	Taiwan Semiconductor Corporation	23.1	37.5	42	1500	DO-201AA, DO-27, Axial	-55 to 175	ROHS3 Compliant
P4KE22A	Taiwan Semiconductor Corporation	18.8	30.6	13.7	400	DO-204AL, DO-41, Axial	-55 to 175	ROHS3 Compliant
P4KE24A	Taiwan Semiconductor Corporation	20.5	33.2	12.6	400	DO-204AL, DO-41, Axial	-55 to 175	ROHS3 Compliant
P4KE27A	Taiwan Semiconductor Corporation	23.1	37.5	11	400	DO-204AL, DO-41, Axial	-55 to 175	ROHS3 Compliant
P6KE22A	Fairchild Semiconductor	18.8	30.6	20	600	DO-204AC, DO-15, Axial	-50 to 175	Not specified
P6KE24A	Fairchild Semiconductor	20.5	33.2	19	600	DO-204AC, DO-15, Axial	-50 to 175	Not specified

Engineering Selection Recommendations

Direct Equivalent (Same Package, Same Power Class): The 5KP20A manufactured by Diotec Semiconductor is the closest equivalent to the 5KP20A-B. Both devices share identical voltage ratings (20V standoff, 32.4V clamping), P600 package configuration, and 5000W peak pulse power dissipation. Peak pulse current differs marginally (154A vs 157.4A). Both are ROHS3 compliant and suitable for direct substitution in existing designs.

Same Power Class, Different Package: The 5KP22A (Diotec) maintains the 5000W power rating and P600 package but operates at 22V standoff with 35.5V clamping. This part is suitable for applications where slightly higher voltage protection is acceptable.

Lower Power Class Substitutes: The 1.5KE series (Taiwan Semiconductor Corporation) provides 1500W peak pulse power in DO-201 packages. These parts are suitable for applications with reduced transient current requirements. The 1.5KE24A offers the closest voltage match (20.5V standoff, 33.2V clamping) to the 5KP20A-B while maintaining ROHS3 compliance and -55°C to 175°C operating range.

Compact Package Alternatives: The P4KE and P6KE series offer reduced footprint solutions in DO-204AL (DO-41) and DO-204AC (DO-15) packages respectively. These parts are suitable for space-constrained applications but provide lower peak pulse current and power dissipation (400W and 600W respectively). The P4KE24A and P6KE24A maintain voltage compatibility with the 5KP20A-B while reducing physical size.

Compliance Considerations: All Taiwan Semiconductor Corporation parts (1.5KE, P4KE series) are ROHS3 compliant. The Diotec 5KP20A is ROHS3 compliant; the 5KP22A compliance status is not applicable. Fairchild P6KE series RoHS status is not specified. For applications requiring verified ROHS3 compliance, Taiwan Semiconductor Corporation and Littelfuse parts are recommended.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 5KP20A-B with a lower power-rated part like the P4KE24A?

A: Substitution depends on your circuit's transient current requirements. The 5KP20A-B handles 157.4A peak pulse current at 5000W. The P4KE24A handles only 12.6A at 400W. If your circuit generates transient currents exceeding 12.6A, the P4KE24A will not provide adequate protection. Use lower power-rated parts only when peak pulse current requirements are confirmed to be within their specifications.

Q: What is the difference between the 5KP20A and 5KP20A-B?

A: Both parts share identical electrical specifications (20V standoff, 32.4V clamping, 157.4A peak pulse, 5000W power). The primary difference is manufacturer: 5KP20A-B is manufactured by Littelfuse Inc., while 5KP20A is manufactured by Diotec Semiconductor. Both are ROHS3 compliant and suitable for equivalent applications.

Q: Can I use a 1.5KE27A instead of the 5KP20A-B?

A: The 1.5KE27A operates at 23.1V standoff with 37.5V clamping, which is higher than the 5KP20A-B (20V standoff, 32.4V clamping). Additionally, the 1.5KE27A provides only 1500W peak pulse power versus 5000W for the 5KP20A-B. Use the 1.5KE27A only if your application requires higher voltage protection and can tolerate reduced power dissipation capability.

Q: Are package changes between P600 and DO-201 compatible with my PCB?

A: No. P600 and DO-201 are different physical packages with different lead spacing and footprints. PCB layout modifications are required to accommodate package changes. Verify your PCB design supports the substitute part's package before implementation.

Q: Which substitute part offers the best balance of voltage compatibility and compact size?

A: The P4KE24A provides voltage compatibility (20.5V standoff, 33.2V clamping) closest to the 5KP20A-B in a compact DO-204AL (DO-41) package. However, peak pulse current is limited to 12.6A at 400W. This part is suitable for low-current transient protection applications requiring reduced footprint.

Q: Do all substitute parts operate across the same temperature range as the 5KP20A-B?

A: No. The 5KP20A-B operates from -55°C to 175°C. The Diotec 5KP20A and 5KP22A operate from -50°C to 175°C (minimum temperature is 5°C higher). The Fairchild P6KE series also operates from -50°C to 175°C. Taiwan Semiconductor Corporation parts (1.5KE and P4KE series) match the full -55°C to 175°C range. Verify temperature requirements for your application before substitution.

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