3KP75C-B Equivalent & Substitute Parts

Part Overview

The 3KP75C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 75V reverse standoff voltage with a 127.05V maximum clamping voltage and 24.8A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system maintenance, repairs, and new designs requiring equivalent protection characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	3KP75C-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	75V
Voltage - Breakdown (Min)	78.93V
Voltage - Clamping (Max) @ Ipp	127.05V
Current - Peak Pulse (10/1000µs)	24.8A
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 of the 3KP75C-B is determined by the following critical parameters that must remain consistent across equivalent components:

Voltage Rating: Reverse standoff voltage of 75V with breakdown voltage range of 78.93V to 83.8V
Clamping Voltage: Maximum clamping voltage between 119.4V and 127.05V at peak pulse current
Peak Pulse Current: Minimum 24.8A capability at 10/1000µs pulse duration
Power Dissipation: Minimum 3000W peak pulse power rating
Package Type: Through-hole axial configuration (P600 or R-6 equivalent)
Operating Temperature Range: -55°C to 175°C junction temperature
Compliance: ROHS3 compliant, EAR99 classification

The substitute parts listed below meet these electrical and mechanical requirements while offering either equivalent or enhanced performance characteristics. Selection among substitutes depends on specific application requirements regarding peak pulse current handling, power dissipation capacity, and packaging availability.

Parameter Comparison

Parameter	3KP75C-B	5KP75CA-B	15KP75CA-TP	15KPA75CAE3/TR13	30KP75CA-TP	3KP75CA-TP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co	Microchip Technology	Micro Commercial Co	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active	Active	Active
Voltage - Reverse Standoff (Typ)	75V	75V	75V	75V	75V	75V
Voltage - Breakdown (Min)	78.93V	83.3V	83.3V	83.8V	83.8V	83.3V
Voltage - Clamping (Max) @ Ipp	127.05V	121V	122V	122V	119.4V	121V
Current - Peak Pulse (10/1000µs)	24.8A	42.1A	—	123.8A	—	24.8A
Power - Peak Pulse	3000W	5000W	15000W	15000W	30000W	3000W
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
Package / Case	P600, Axial	P600, Axial	R-6, Axial	P600, Axial	R-6, Axial	R-6, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance)

The 3KP75CA-TP from Micro Commercial Co provides the closest functional equivalent to the 3KP75C-B. Both components share identical peak pulse current (24.8A) and power dissipation (3000W) specifications. This part is currently in active production status with ROHS3 compliance and REACH unaffected designation. The primary difference is the package variant (R-6 versus P600), which requires mechanical verification for PCB footprint compatibility.

Enhanced Performance Substitutes

The 5KP75CA-B (Littelfuse Inc.) offers increased peak pulse current (42.1A) and power dissipation (5000W) while maintaining the same voltage rating and P600 package configuration. This component is active and ROHS3 compliant, providing a direct upgrade path for applications requiring higher transient energy absorption.

The 15KPA75CAE3/TR13 (Microchip Technology) and 15KP75CA-TP (Micro Commercial Co) provide significantly enhanced power handling (15000W) with the same voltage rating. The Microchip part maintains P600 packaging and delivers 123.8A peak pulse current, while the Micro Commercial Co variant uses R-6 packaging. Both are active products with full compliance certifications.

The 30KP75CA-TP (Micro Commercial Co) represents the maximum power dissipation option (30000W) for applications requiring extreme transient protection. This part maintains the 75V voltage rating in R-6 axial packaging and is actively produced with ROHS3 compliance.

Selection Criteria

Choose substitutes based on application requirements for peak pulse current handling and power dissipation capacity. All listed alternatives maintain the critical 75V reverse standoff voltage and -55°C to 175°C operating temperature range. Verify package footprint compatibility with existing PCB designs when transitioning between P600 and R-6 configurations.

Frequently Asked Questions (FAQ)

Q: Can the 3KP75CA-TP directly replace the 3KP75C-B without circuit modifications?

A: The 3KP75CA-TP provides electrical equivalence with identical voltage ratings, peak pulse current (24.8A), and power dissipation (3000W). However, the package differs (R-6 versus P600 axial). Verify PCB footprint compatibility before substitution. No circuit modifications are required if mechanical fit is confirmed.

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

A: Both P600 and R-6 are through-hole axial package configurations for TVS diodes. The primary difference lies in physical dimensions and lead spacing. Verify your PCB design specifications and component footprint requirements before selecting between these package types.

Q: Why would I choose a higher power-rated substitute like the 15KPA75CAE3/TR13 or 30KP75CA-TP?

A: Higher power-rated substitutes (15000W or 30000W) provide enhanced transient energy absorption capability. Select these when your application experiences higher-energy transient events than the original 3000W specification accommodates. The voltage rating remains constant at 75V, ensuring circuit protection characteristics are maintained.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—5KP75CA-B, 15KP75CA-TP, 15KPA75CAE3/TR13, 30KP75CA-TP, and 3KP75CA-TP—are ROHS3 compliant. This ensures compatibility with environmental and regulatory requirements for electronic component manufacturing and assembly.

Q: What is the significance of the 75V reverse standoff voltage specification?

A: The 75V reverse standoff voltage defines the maximum voltage the TVS diode can withstand without conducting. This parameter must remain consistent across substitutes to ensure proper circuit protection. All listed alternatives maintain this 75V specification, confirming their suitability for the same protection application.

Q: Can I use the 5KP75CA-B as a direct substitute if my application requires higher current handling?

A: Yes. The 5KP75CA-B maintains the same 75V voltage rating and P600 package as the original 3KP75C-B while providing increased peak pulse current (42.1A) and power dissipation (5000W). This represents a compatible upgrade for applications requiring enhanced transient protection without circuit redesign.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message