3KP220A Equivalent & Substitute Parts

Part Overview

The 3KP220A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. It features a 220V reverse standoff voltage with a maximum clamping voltage of 371.1V at peak pulse current. The device is packaged in a P600 axial through-hole configuration and operates across a temperature range of -55°C to 175°C.

The 3KP220A is classified as obsolete. Identifying equivalent substitute parts ensures continued availability for maintenance, repair, and new production applications where this component specification is required.

Substiute Parts

3KP220A

LittelfuseIn Stock: 9593KP220A Datasheet

Current PartRFQ

5KP220A

Littelfuse Inc.In Stock: 18145KP220A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP220A is determined by the following critical parameters that must remain constant or compatible:

• Voltage Rating: Reverse standoff voltage of 220V and breakdown voltage minimum of 244V
• Clamping Voltage: Maximum clamping voltage of 371.1V at peak pulse current
• Package Type: P600 axial through-hole configuration for mechanical and electrical compatibility
• Device Type: Unidirectional Zener TVS diode for identical functional operation
• Operating Temperature Range: -55°C to 175°C to ensure thermal compatibility

The 5KP220A meets all these substitution criteria. While it exhibits higher peak pulse current (13.7A versus 8.1A) and greater peak pulse power (5000W versus 3000W), these represent enhanced performance characteristics that do not compromise compatibility. The identical voltage ratings, clamping specifications, package configuration, and temperature range ensure direct functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The 5KP220A is the direct substitute for the obsolete 3KP220A. Both devices maintain identical voltage specifications (220V reverse standoff, 244V minimum breakdown, 371.1V maximum clamping) and package configuration (P600 axial through-hole). The 5KP220A is currently in active production status, ensuring long-term availability and supply chain continuity.

Both parts are ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity), meeting modern environmental and reliability standards. The identical ECCN and HTSUS classifications confirm regulatory equivalence.

The 5KP220A's higher peak pulse current (13.7A) and power rating (5000W) represent performance enhancements that provide additional margin in overvoltage protection applications without introducing compatibility issues. These characteristics make the 5KP220A suitable for direct replacement in all applications where the 3KP220A was originally specified.

Frequently Asked Questions (FAQ)

Q: Can the 5KP220A directly replace the 3KP220A in existing designs?

A: Yes. The 5KP220A maintains identical voltage ratings, clamping characteristics, and P600 axial through-hole package configuration. No circuit modifications are required.

Q: What is the significance of the higher peak pulse current in the 5KP220A?

A: The 5KP220A's 13.7A peak pulse current (versus 3KP220A's 8.1A) and 5000W power rating (versus 3000W) represent enhanced transient suppression capability. These parameters do not affect compatibility; they provide additional performance margin for overvoltage events.

Q: Are there any thermal or environmental differences between these parts?

A: No. Both devices operate across -55°C to 175°C and share identical MSL rating of 1 (unlimited). Environmental and thermal performance are equivalent.

Q: Why is the 3KP220A classified as obsolete?

A: The 3KP220A has been superseded by the 5KP220A in Littelfuse's product portfolio. The 5KP series offers improved performance characteristics while maintaining full backward compatibility.

Q: Are both parts RoHS compliant?

A: Yes. Both the 3KP220A and 5KP220A are ROHS3 compliant, meeting current environmental regulations.

Q: What packaging options are available for the 5KP220A?

A: The 5KP220A is supplied in Cut Tape (CT) packaging. The P600 axial through-hole package configuration remains consistent with the original 3KP220A specification.