Littelfuse 3KP11-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The Littelfuse 3KP11-B is a unidirectional Zener-type transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This component features an 11V reverse standoff voltage with a 19.11V maximum clamping voltage and 164.8A peak pulse current capability in a through-hole P600 axial package. The 3KP11-B is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility while meeting current procurement requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	3KP11-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	11V
Voltage - Breakdown (Min)	11.57V
Voltage - Clamping (Max) @ Ipp	19.11V
Current - Peak Pulse (10/1000µs)	164.8A
Power - Peak Pulse	3000W (3kW)
Operating Temperature Range	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 3KP11-B is determined by the following critical parameters that must remain within acceptable tolerances:

Primary Matching Criteria:

Reverse standoff voltage: 11V (nominal)
Unidirectional Zener type configuration
Through-hole axial mounting
Operating temperature range: -55°C to 175°C
RoHS3 compliance

Secondary Compatibility Parameters:

Voltage breakdown minimum: 11.57V to 12.2V range
Voltage clamping maximum: 18.2V to 20.1V range
Peak pulse current: 164.8A to 280.2A
Peak pulse power: 3000W to 5000W
Package designation: P600 or R-6 axial

The substitute parts listed below satisfy all primary matching criteria. Secondary parameters may vary within the specified ranges, which is acceptable for general-purpose transient voltage suppression applications where the core protection threshold and response characteristics remain functionally equivalent.

Parameter Comparison

Parameter	3KP11-B (Main)	5KP11A-B	3KP11A-TP	5KP11A-E3/54	5KP11A-E3/73	5KP11E3/TR13
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co	Vishay General Semiconductor	Vishay General Semiconductor	Microchip Technology
Product Status	Obsolete	Active	Active	Active	Active	Active
Type	Zener	Zener	Zener	Zener	Zener	Zener
Voltage - Reverse Standoff (Typ)	11V	11V	11V	11V	11V	11V
Voltage - Breakdown (Min)	11.57V	12.2V	12.2V	12.2V	12.2V	12.2V
Voltage - Clamping (Max) @ Ipp	19.11V	18.2V	18.2V	18.2V	18.2V	20.1V
Current - Peak Pulse (10/1000µs)	164.8A	280.2A	164.8A	275A	275A	249A
Power - Peak Pulse	3000W	5000W	3000W	5000W	5000W	5000W
Operating Temperature	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	P600, Axial	P600, Axial	R-6, Axial	P600, Axial	P600, Axial	P600, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (P600 Package Compatibility):

The 5KP11A-B (Littelfuse Inc.) provides the most direct substitution path. Both components share identical manufacturer lineage, P600 axial package designation, and ROHS3 compliance. The 5KP11A-B offers enhanced specifications with 280.2A peak pulse current and 5000W peak pulse power, providing superior transient suppression capability while maintaining the 11V standoff voltage and 18.2V clamping voltage within acceptable tolerance of the original design.

The 5KP11A-E3/54 and 5KP11A-E3/73 (Vishay General Semiconductor - Diodes Division) are functionally equivalent alternatives in P600 packages with active product status and ROHS3 compliance. Both deliver 275A peak pulse current and 5000W peak pulse power with identical voltage characteristics to the 5KP11A-B.

The 5KP11E3/TR13 (Microchip Technology) maintains P600 package compatibility and active status with ROHS3 compliance. This part exhibits a slightly elevated clamping voltage of 20.1V with 249A peak pulse current, remaining within acceptable operational parameters for general-purpose applications.

Alternative Package Consideration:

The 3KP11A-TP (Micro Commercial Co) provides functional equivalence with identical peak pulse current (164.8A) and power (3000W) matching the original 3KP11-B specifications. However, this part uses an R-6 axial package rather than P600. Physical board layout compatibility must be verified before selection. This component maintains active product status and REACH compliance.

Compliance and Procurement:

All recommended substitutes maintain ROHS3 compliance and operate across the -55°C to 175°C temperature range. The Littelfuse 5KP11A-B and Vishay options (5KP11A-E3/54, 5KP11A-E3/73) offer the highest inventory availability and established supply chain presence for production applications.

Frequently Asked Questions (FAQ)

Q: Can the 5KP11A-B directly replace the 3KP11-B without circuit modification?

A: Yes. Both components share the same 11V reverse standoff voltage, unidirectional Zener configuration, and P600 axial package. The 5KP11A-B's enhanced current and power ratings (280.2A, 5000W versus 164.8A, 3000W) provide improved transient suppression without requiring design changes. The 18.2V clamping voltage is within acceptable tolerance of the original 19.11V specification.

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 designations refer to different physical form factors and lead configurations. While functionally equivalent electrically, physical board layout and component placement may differ. Verify PCB footprint compatibility before selecting the 3KP11A-TP with R-6 packaging.

Q: Are all substitute parts RoHS compliant?

A: The 5KP11A-B, 5KP11A-E3/54, 5KP11A-E3/73, and 5KP11E3/TR13 are ROHS3 compliant. The 3KP11A-TP RoHS status is not specified in available documentation. Confirm RoHS requirements with your procurement or compliance department before final selection.

Q: Which substitute offers the best availability?

A: The 5KP11A-E3/54 (Vishay) shows the highest inventory level at 8200 pieces. The 5KP11A-B (Littelfuse) provides 912 pieces with established supply chain presence. Both are suitable for production volume requirements.

Q: Can I use the higher-power 5KP11A-B in place of the 3KP11-B?

A: Yes. The 5KP11A-B's 5000W peak pulse power rating exceeds the original 3000W specification, providing enhanced protection margin. This is a conservative substitution that improves system reliability without introducing compatibility issues.

Q: What are the key electrical parameters that must match for substitution?

A: The critical parameters are reverse standoff voltage (11V nominal), unidirectional Zener type, voltage breakdown minimum (11.57V to 12.2V acceptable range), and clamping voltage maximum (18.2V to 20.1V acceptable range). Peak pulse current and power may exceed original specifications without adverse effects in general-purpose applications.

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