K2402G Equivalent & Substitute Parts

Part Overview

The K2402G is a SIDAC thyristor manufactured by Littelfuse Inc., rated for 220–250V breakover voltage with 1A peak output current in DO-15 axial packaging. This component is designed for transient voltage suppression and overvoltage protection applications. The product maintains Active status with 673 units in current inventory. Due to the Last Time Buy status of certain alternative designs and evolving supply chain conditions, equivalent substitute parts may be required for design flexibility and long-term availability assurance.

Substiute Parts

K2402G

Littelfuse Inc.In Stock: 693K2402G Datasheet

Current PartRFQ

TPA220

STMicroelectronicsIn Stock: 2092TPA220 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the K2402G is determined by the following critical parameters:

• Voltage Rating Compatibility: Breakover voltage and off-state voltage must fall within or closely align with the 220–250V specification to ensure proper circuit protection without nuisance triggering.
• Current Handling: Hold current (Ih) and peak pulse current ratings must meet or exceed the application requirements without exceeding thermal limits.
• Package Compatibility: DO-15 axial packaging is mandatory for mechanical and electrical interchangeability.
• Regulatory Compliance: RoHS3 and REACH compliance status must be maintained.

The TPA220 from STMicroelectronics qualifies as a substitute based on matching hold current (150 mA), compatible DO-15 packaging, and equivalent regulatory compliance. The TPA220 operates as a TVS thyristor with a 220V off-state rating and higher peak pulse current capability (150 A at 8/20µs), providing enhanced transient suppression performance within the same voltage class.

Parameter Comparison

Engineering Selection Recommendations

K2402G (Primary Selection): Recommended for new designs and applications requiring long-term availability. Active product status ensures continued supply and manufacturing support. ROHS3 compliance and REACH unaffected status meet current regulatory requirements.

TPA220 (Substitute Selection): Suitable for existing designs or applications where higher transient current handling (150 A peak pulse) is beneficial. Last Time Buy status indicates limited future availability; procurement should prioritize current inventory if this part is selected. Identical hold current and package compatibility ensure functional interchangeability in most circuit topologies. ROHS3 compliance and REACH unaffected status maintain regulatory alignment.

Selection between these parts should be based on application transient current requirements and supply chain strategy rather than electrical performance alone.

Frequently Asked Questions (FAQ)

Q: Can TPA220 directly replace K2402G in existing circuits?

A: Yes, within the constraints of your application. Both parts share identical DO-15 packaging, 150 mA hold current, and 220V nominal voltage class. The TPA220 offers significantly higher peak pulse current (150 A vs. 1 A), which may provide additional margin in transient suppression but does not create incompatibility. Circuit validation is necessary only if your design operates at the upper limits of the K2402G's 1 A specification.

Q: What is the significance of the 293V breakover voltage on the TPA220?

A: The TPA220 specifies 293V breakover voltage while maintaining a 220V off-state rating. This indicates the device triggers at a higher threshold but clamps at 220V during conduction. For applications designed around the K2402G's 220–250V breakover window, this difference may affect trigger timing in marginal overvoltage conditions. Verify your circuit's overvoltage margin before substitution.

Q: Why is TPA220 marked as Last Time Buy?

A: Last Time Buy status indicates STMicroelectronics has announced end-of-life for this product. Existing inventory remains available, but no new manufacturing runs are planned. If TPA220 is selected for a design, secure sufficient inventory for the product lifecycle. K2402G's Active status makes it the preferred choice for designs requiring extended production support.

Q: Are both parts suitable for -40°C to 125°C operating range?

A: K2402G explicitly specifies -40°C to 125°C (TJ) operating temperature. TPA220 temperature range is not provided in the available data. Confirm TPA220 thermal specifications with the manufacturer datasheet before deployment in temperature-critical applications.

Q: Do both parts meet current regulatory compliance?

A: Yes. Both K2402G and TPA220 are ROHS3 compliant and REACH unaffected, meeting current EU and international regulatory requirements for electronic components.