Littelfuse 3KP100C Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The Littelfuse 3KP100C is a bidirectional Zener transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. Featuring a 100V reverse standoff voltage and 3kW peak pulse power rating, this through-hole P600 axial package component provides transient suppression in 100V circuits. The 3KP100C is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	100	V
Breakdown Voltage (Min)	105.3	V
Clamping Voltage (Max) @ Ipp	170.1	V
Peak Pulse Current (10/1000µs)	18.5	A
Peak Pulse Power	3000	W
Operating Temperature Range	-55 to 175	°C
Package Type	P600, Axial	Through Hole
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 3KP100C is determined by the following critical parameters:

Reverse Standoff Voltage: Must be 100V (Typ) to maintain circuit protection threshold
Package Type: Must be P600 axial through-hole for mechanical compatibility
Bidirectional Channels: Must be 1 channel for equivalent functionality
Operating Temperature Range: Must support -55°C to 175°C (TJ)
RoHS Compliance: Must maintain ROHS3 compliance status
Diode Type: Must be Zener type for equivalent electrical behavior

The substitute parts identified (5KP100CA, 5KP100CAE3/TR13, 5KP100CE3/TR13) share identical reverse standoff voltage, package configuration, and temperature operating range. These parts are active products with higher peak pulse power ratings (5kW vs. 3kW) and increased peak pulse current capabilities, providing enhanced protection margins while maintaining backward compatibility with the 3KP100C footprint and electrical interface.

Parameter Comparison

Parameter	3KP100C (Main)	5KP100CA	5KP100CAE3/TR13	5KP100CE3/TR13
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active	Active
Reverse Standoff Voltage (Typ)	100V	100V	100V	100V
Breakdown Voltage (Min)	105.3V	110V	111V	111V
Clamping Voltage (Max) @ Ipp	170.1V	162V	162V	179V
Peak Pulse Current (10/1000µs)	18.5A	31.5A	30.9A	27.9A
Peak Pulse Power	3000W	5000W	5000W	5000W
Operating Temperature Range	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package / Case	P600, Axial	P600, Axial	P600, Axial	P600, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three substitute parts are active products with current manufacturing status, ensuring long-term availability and supply chain continuity. The 5KP100CA (Littelfuse Inc.) maintains original manufacturer continuity while offering increased power dissipation capability. The 5KP100CAE3/TR13 and 5KP100CE3/TR13 (Microchip Technology) provide manufacturer-recommended alternatives with equivalent electrical performance and identical package compatibility.

Selection between 5KP100CAE3/TR13 and 5KP100CE3/TR13 depends on clamping voltage requirements: the CAE3 variant provides 162V clamping (closer to the original 170.1V specification), while the CE3 variant provides 179V clamping for applications requiring higher transient suppression voltage. All substitutes maintain ROHS3 compliance and unlimited moisture sensitivity rating, supporting deployment in standard manufacturing and storage environments.

Frequently Asked Questions (FAQ)

Q: Can the 5KP100CA directly replace the 3KP100C in existing designs?

A: Yes. The 5KP100CA maintains identical reverse standoff voltage (100V), package configuration (P600 axial), and operating temperature range (-55 to 175°C). The increased peak pulse power (5kW vs. 3kW) and peak pulse current (31.5A vs. 18.5A) provide enhanced protection margins without affecting circuit compatibility.

Q: What is the difference between 5KP100CAE3/TR13 and 5KP100CE3/TR13?

A: Both parts are Microchip Technology equivalents with identical reverse standoff voltage and package type. The primary difference is clamping voltage: 5KP100CAE3/TR13 clamps at 162V maximum, while 5KP100CE3/TR13 clamps at 179V maximum. Select based on the maximum transient voltage your circuit can tolerate.

Q: Are there packaging differences between these substitutes?

A: The 5KP100CA is supplied in Cut Tape (CT) packaging, while 5KP100CAE3/TR13 and 5KP100CE3/TR13 are supplied in Tape & Reel (TR) format. All three maintain identical P600 axial through-hole package configuration for PCB mounting compatibility.

Q: Do all substitutes meet the same compliance requirements?

A: Yes. All substitute parts are ROHS3 compliant with moisture sensitivity level 1 (unlimited), matching the original 3KP100C specifications. REACH status is unaffected for the Microchip variants.

Q: Why is the 3KP100C obsolete?

A: The 3KP100C has been superseded by higher-performance 5kW variants that provide superior transient suppression capability in the same package footprint, offering better protection margins for modern circuit designs.

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