Littelfuse 3KP110A Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The Littelfuse 3KP110A is a unidirectional Zener-type transient voltage suppressor designed for general-purpose overvoltage protection applications. This through-hole axial component operates across a temperature range of -55°C to 175°C and provides peak pulse power dissipation of 3000W. The 3KP110A is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

3KP110A

Littelfuse Inc.In Stock: 8143KP110A Datasheet

Current PartRFQ

5KP110A

EIC SEMICONDUCTOR INC.In Stock: 42785KP110A Datasheet

DirectRFQ

3KP110A-TP

Micro Commercial CoIn Stock: 10143KP110A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP110A is determined by strict equivalence across the following critical electrical parameters:

• Voltage - Reverse Standoff (Typ): 110V
• Voltage - Breakdown (Min): 122V
• Voltage - Clamping (Max) @ Ipp: 177V
• Unidirectional Zener topology
• Through-hole axial mounting configuration
• RoHS3 compliance

Two substitute parts meet these criteria with variations in peak pulse current and power dissipation capacity:

1. 5KP110A (EIC Semiconductor Inc.) — Higher current rating (28A vs. 16.9A) and increased power dissipation (5000W vs. 3000W)
2. 3KP110A-TP (Micro Commercial Co) — Identical electrical specifications with matching current and power ratings

Parameter Comparison

Engineering Selection Recommendations

3KP110A-TP (Micro Commercial Co) is the primary substitute for direct replacement. This part maintains identical electrical specifications (110V standoff, 177V clamping, 16.9A peak pulse, 3000W power dissipation) and extends the operating temperature range to 175°C, matching the original component. Product status is active, ensuring long-term availability. REACH compliance status is unaffected.

5KP110A (EIC Semiconductor Inc.) serves as an alternative for applications requiring enhanced transient energy absorption. The increased peak pulse current (28A) and power dissipation (5000W) provide additional margin for high-energy transient events. Operating temperature range is reduced to 150°C. This part is suitable for designs where thermal headroom and higher surge capacity are beneficial. Product status is active.

Both substitutes maintain the critical voltage parameters (110V standoff, 122V breakdown minimum, 177V clamping maximum) required for circuit protection equivalence. Package variations (P600 vs. D-6 vs. R-6) are axial through-hole configurations and do not affect electrical performance in standard PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the 5KP110A replace the 3KP110A in all applications?

A: The 5KP110A maintains identical voltage specifications but operates at a maximum temperature of 150°C versus 175°C for the original 3KP110A. For applications operating near the upper temperature limit, verify that the reduced maximum temperature does not violate system requirements. The higher current and power ratings (28A, 5000W) are backward-compatible with circuits designed for 16.9A and 3000W.

Q: What is the difference between the 3KP110A-TP and the original 3KP110A?

A: The 3KP110A-TP is electrically identical to the 3KP110A across all critical parameters: voltage standoff, breakdown, clamping, peak pulse current, and power dissipation. The primary difference is product status (active vs. obsolete) and package designation (R-6 vs. P600). Both are through-hole axial components suitable for standard PCB mounting.

Q: Are package differences between P600, D-6, and R-6 significant for PCB layout?

A: All three packages are through-hole axial configurations. Physical dimensions may vary slightly, but standard PCB footprints for axial components accommodate these variations. Verify specific package dimensions against your PCB design if space constraints are critical.

Q: Do all substitute parts meet RoHS3 compliance?

A: The 3KP110A-TP and 5KP110A are both ROHS3 compliant. The 3KP110A-TP carries REACH unaffected status. Confirm compliance requirements for your specific application and regulatory jurisdiction.

Q: Which substitute should I select for new designs?

A: For new designs requiring exact electrical equivalence with extended temperature operation, use the 3KP110A-TP. For applications where higher transient energy absorption is beneficial, the 5KP110A provides enhanced protection margin at the cost of reduced maximum operating temperature.