3KP220 Equivalent & Substitute Parts

Part Overview

The 3KP220 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. It features a 220V reverse standoff voltage rating with a maximum clamping voltage of 389.66V 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 3KP220 is classified as obsolete. Identifying equivalent substitute parts ensures continued availability for maintenance, repair, and new design implementations where this component specification remains applicable.

Substiute Parts

3KP220

Littelfuse Inc.In Stock: 9113KP220 Datasheet

Current PartRFQ

5KP220A

Littelfuse Inc.In Stock: 18145KP220A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP220 is determined by the following critical parameters:

• Voltage Rating Compatibility: Reverse standoff voltage of 220V and breakdown voltage minimum of 231.3V
• Package Compatibility: P600 axial through-hole configuration for direct mechanical and electrical fit
• Thermal Performance: Operating temperature range of -55°C to 175°C
• Regulatory Compliance: ROHS3 compliance and MSL rating of 1
• Functional Classification: Unidirectional Zener TVS diode for general-purpose transient suppression

The 5KP220A qualifies as a direct substitute based on matching voltage ratings, identical package configuration, equivalent thermal specifications, and identical regulatory compliance status. The substitute maintains the same reverse standoff voltage (220V) and operates within the same temperature range, ensuring functional equivalence in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The 5KP220A is a qualified substitute for the obsolete 3KP220 based on the following engineering criteria:

Regulatory Compliance: Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring equivalent environmental and regulatory standing.

Electrical Equivalence: Both devices share the same 220V reverse standoff voltage and P600 axial package, providing direct functional compatibility in existing circuit designs. The 5KP220A exhibits improved performance characteristics with higher peak pulse current (13.7A versus 8.1A) and greater peak pulse power rating (5kW versus 3kW), making it suitable for applications requiring equal or greater transient suppression capability.

Thermal Performance: Identical operating temperature range (-55°C to 175°C) ensures equivalent thermal behavior across all operating conditions.

Product Availability: The 5KP220A maintains active product status with established supply chain availability, addressing the obsolescence of the 3KP220.

Frequently Asked Questions (FAQ)

Q: Can the 5KP220A be used as a direct replacement for the 3KP220 in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (220V), operating temperature range (-55°C to 175°C), and P600 axial through-hole package configuration. The 5KP220A provides equivalent or superior performance for transient voltage suppression applications.

Q: What are the key differences between the 3KP220 and 5KP220A?

A: The primary differences are peak pulse current rating (8.1A versus 13.7A) and peak pulse power rating (3kW versus 5kW). The 5KP220A provides higher transient suppression capability. The 5KP220A is active in production, while the 3KP220 is obsolete.

Q: Are the packages physically identical?

A: Yes. Both parts use the P600 axial through-hole package, enabling direct mechanical substitution without PCB layout modifications.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the 3KP220 and 5KP220A are ROHS3 compliant with MSL rating of 1 (Unlimited), meeting identical environmental and regulatory standards.

Q: Which part should be selected for new designs?

A: The 5KP220A should be selected for new designs due to its active product status, higher performance ratings, and established supply chain availability.