3KP110C-B Equivalent & Substitute Parts

Part Overview

The 3KP110C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional zener diode features a 110V reverse standoff voltage and 185.85V maximum clamping voltage with 16.9A peak pulse current capability in a through-hole P600 axial package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	110V
Voltage - Breakdown (Min)	115.65V
Voltage - Clamping (Max) @ Ipp	185.85V
Current - Peak Pulse (10/1000µs)	16.9A
Power - Peak Pulse	3000W
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
Type	Zener
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 3KP110C-B is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 110V to maintain circuit protection threshold
Bidirectional Channels: Must be 1 (single channel)
Type: Must be Zener diode
Mounting Type: Must be Through Hole
Operating Temperature Range: Must support -55°C ~ 175°C (TJ)
RoHS Compliance: Must be ROHS3 Compliant

Substitute parts are grouped into two categories based on package compatibility and power rating:

Category A - Same Power Rating (3kW): 3KP110CA-TP maintains identical 3000W peak pulse power and 16.9A peak pulse current, suitable for direct replacement in existing designs.

Category B - Higher Power Ratings (5kW and 15kW): 5KP110CA-B, 5KP110CA-TP, 5KP110CAE3/TR13, 5KP110CE3/TR13, 15KP110CA-TP, 15KPA110CAE3/TR13, and 15KPA110CE3/TR13 provide enhanced surge protection capability with increased peak pulse current and power dissipation, applicable where additional protection margin is required.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status
3KP110C-B	Littelfuse Inc.	110V	115.65V	185.85V	16.9A	3000W	P600, Axial	Obsolete
3KP110CA-TP	Micro Commercial Co	110V	122V	177V	16.9A	3000W	R-6, Axial	Active
5KP110CA-B	Littelfuse Inc.	110V	122V	177V	28.8A	5000W	P600, Axial	Active
5KP110CA-TP	Micro Commercial Co	110V	122V	177V	—	5000W	R-6, Axial	Active
5KP110CAE3/TR13	Microchip Technology	110V	122V	177V	28.2A	5000W	P600, Axial	Active
5KP110CE3/TR13	Microchip Technology	110V	122V	196V	25.5A	5000W	P600, Axial	Active
15KP110CA-TP	Micro Commercial Co	110V	122V	178V	—	15000W	R-6, Axial	Active
15KPA110CAE3/TR13	Microchip Technology	110V	122.9V	178.6V	84.5A	15000W	P600, Axial	Active
15KPA110CE3/TR13	Microchip Technology	110V	115.83V	—	—	15000W	P600, Axial	Active

Engineering Selection Recommendations

For Direct Replacement (Same Power Rating)

The 3KP110CA-TP from Micro Commercial Co is the primary equivalent for the obsolete 3KP110C-B. Both maintain 3000W peak pulse power and 16.9A peak pulse current. The 3KP110CA-TP is active in production and ROHS3 compliant. Package difference (R-6 vs. P600) requires PCB layout verification but does not affect electrical performance.

For Enhanced Protection (Higher Power Ratings)

When circuit design permits or when additional surge protection margin is required, the 5KP series (5000W) and 15KP series (15000W) provide increased current handling and power dissipation. All substitute parts listed maintain the 110V reverse standoff voltage and operate within the -55°C ~ 175°C temperature range.

Compliance and Availability

All substitute parts are ROHS3 compliant and currently active in production. Littelfuse Inc. 5KP110CA-B and Microchip Technology variants (5KP110CAE3/TR13, 15KPA110CAE3/TR13, 15KPA110CE3/TR13) maintain P600 axial packaging for direct PCB footprint compatibility. Micro Commercial Co variants use R-6 axial packaging, requiring footprint verification.

Frequently Asked Questions (FAQ)

Q: Can I use a higher power-rated TVS diode as a substitute?

A: Yes. The 5KP and 15KP series provide higher peak pulse current and power dissipation while maintaining the same 110V reverse standoff voltage. Higher power ratings do not degrade circuit performance and provide additional protection margin. Verify PCB layout compatibility with the selected package type.

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 differ in physical dimensions and lead spacing. Verify PCB footprint compatibility before selecting a substitute. Littelfuse and Microchip parts use P600; Micro Commercial Co parts use R-6.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and suitable for applications requiring environmental compliance certification.

Q: What determines whether a TVS diode can substitute for the 3KP110C-B?

A: The critical parameters are 110V reverse standoff voltage, single bidirectional channel, zener type, through-hole mounting, and -55°C ~ 175°C operating temperature range. Peak pulse current and power rating may be equal or higher without affecting compatibility.

Q: Why is the 3KP110C-B obsolete?

A: The part is no longer manufactured by Littelfuse Inc. Active equivalents from the same manufacturer (5KP110CA-B) and alternative manufacturers (Micro Commercial Co, Microchip Technology) are available for new designs and production.

Q: Can I mix different substitute parts in the same circuit?

A: Yes, provided all parts meet the minimum electrical requirements (110V reverse standoff, appropriate current and power ratings for the application). Verify that selected parts are from the same manufacturing lot or qualified source to ensure consistency in production environments.

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