3KP20-B Equivalent & Substitute Parts

Part Overview

The 3KP20-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 20V reverse standoff voltage with a 34.02V maximum clamping voltage and 92.6A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	3KP20-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	20V
Voltage - Breakdown (Min)	21.02V
Voltage - Clamping (Max) @ Ipp	34.02V
Current - Peak Pulse (10/1000µs)	92.6A
Power - Peak Pulse	3000W (3kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 3KP20-B is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 20V
Voltage - Clamping (Max) @ Ipp: 32.4V to 34.3V range
Mounting Type: Through Hole
Package / Case: P600 or R-6 Axial
Operating Temperature: -55°C ~ 175°C (TJ)
Type: Zener, Unidirectional

Substitute parts must maintain the 20V reverse standoff voltage specification and operate within the same temperature range. Clamping voltage tolerance allows for variations between 32.4V and 34.3V. Package compatibility includes both P600 and R-6 axial configurations. All substitute parts listed are active products with ROHS3 compliance, ensuring regulatory alignment and long-term availability.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
3KP20-B	Littelfuse Inc.	20V	34.02V	92.6A	3000W	P600, Axial	Obsolete	ROHS3 Compliant
5KP20A-B	Littelfuse Inc.	20V	32.4V	157.4A	5000W	P600, Axial	Active	ROHS3 Compliant
15KPA20AE3/TR13	Microchip Technology	20V	34.3V	440.2A	15000W	P600, Axial	Active	ROHS3 Compliant
5KP20A-E3/54	Vishay General Semiconductor - Diodes Division	20V	32.4V	154A	5000W	P600, Axial	Active	ROHS3 Compliant
5KP20A-E3/73	Vishay General Semiconductor - Diodes Division	20V	32.4V	154A	5000W	P600, Axial	Active	ROHS3 Compliant
5KP20A-TP	Micro Commercial Co	20V	32.4V	Not Specified	5000W	R-6, Axial	Active	ROHS3 Compliant
5KP20AHE3/54	Vishay General Semiconductor - Diodes Division	20V	32.4V	154A	5000W	P600, Axial	Active	ROHS3 Compliant
5KP20AHE3/73	Vishay General Semiconductor - Diodes Division	20V	32.4V	154A	5000W	P600, Axial	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 3KP20-B, the 5KP20A-B from Littelfuse Inc. is the primary recommendation. This part maintains manufacturer continuity, identical reverse standoff voltage, compatible P600 axial package, and active product status with full ROHS3 compliance. The 5KP20A-B provides enhanced performance with 157.4A peak pulse current and 5000W power dissipation, exceeding the original specification.

The 5KP20A-E3/54 and 5KP20AHE3/54 from Vishay General Semiconductor offer equivalent electrical performance with the same P600 package and active status. These TransZorb® series components provide proven reliability in industrial applications.

For applications requiring higher current handling capability, the 15KPA20AE3/TR13 from Microchip Technology delivers 440.2A peak pulse current and 15000W power dissipation while maintaining the 20V reverse standoff voltage and P600 package compatibility.

The 5KP20AHE3/54 and 5KP20AHE3/73 variants include AEC-Q101 automotive qualification, suitable for automotive-grade applications requiring enhanced reliability standards.

Frequently Asked Questions (FAQ)

Q: Can the 5KP20A-B directly replace the 3KP20-B?

A: Yes. Both parts share the same 20V reverse standoff voltage, P600 axial package, and -55°C to 175°C operating temperature range. The 5KP20A-B is an active product with superior current and power ratings, making it a suitable direct replacement.

Q: What is the difference between P600 and R-6 packages?

A: Both are through-hole axial packages for TVS diodes. P600 and R-6 are different package designations from various manufacturers. The 5KP20A-TP uses the R-6 package. Verify mechanical compatibility with your PCB layout before substitution.

Q: Why do some substitute parts have higher power ratings?

A: The 5KP20A series and 15KPA20AE3/TR13 are designed for higher transient energy absorption. Higher power ratings provide additional margin for overvoltage protection without affecting the core 20V reverse standoff voltage specification. Selection depends on your circuit's transient energy requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, ensuring regulatory alignment with current environmental standards.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive electronics qualification standard. The 5KP20AHE3/54 and 5KP20AHE3/73 variants meet this standard, making them suitable for automotive applications requiring enhanced reliability and quality assurance.

Q: Can I use the 15KPA20AE3/TR13 in place of the 3KP20-B?

A: Yes. The 15KPA20AE3/TR13 maintains the 20V reverse standoff voltage and P600 package compatibility. Its higher current and power ratings provide enhanced protection capability without compromising electrical compatibility.

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