K2502G Equivalent & Substitute Parts

Part Overview

The K2502G is a SIDAC thyristor manufactured by Littelfuse Inc., rated for 240–280V 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 786 units in current inventory. Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances for this thyristor category, particularly when the original part becomes unavailable or when alternative packaging or supplier options are required.

Substiute Parts

K2502G

Littelfuse Inc.In Stock: 895K2502G Datasheet

Current PartRFQ

TPA220

STMicroelectronicsIn Stock: 2092TPA220 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the K2502G is determined by alignment across the following critical parameters:

• Voltage Rating: Breakover voltage and off-state voltage must fall within or closely match the 240–280V specification to ensure proper overvoltage protection activation.
• Current Handling: Hold current (Ih) and peak pulse current ratings must support the application's transient suppression requirements.
• Package Compatibility: DO-15 axial or DO-204AC equivalent packaging ensures mechanical and electrical fit in existing circuit designs.
• Regulatory Compliance: RoHS3 and REACH compliance status must be maintained for supply chain and environmental requirements.
• Product Availability: Active or Last Time Buy status indicates current or near-term sourcing viability.

The TPA220 from STMicroelectronics qualifies as a substitute based on matching hold current (150 mA), compatible axial packaging (DO-15/DO-204AC), and equivalent regulatory compliance. The TPA220 operates at 220V off-state with 293V breakover, positioning it within acceptable tolerance for thyristor-based transient suppression in this voltage class.

Parameter Comparison

Engineering Selection Recommendations

K2502G (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 applications where K2502G supply is constrained or discontinued. Last Time Buy status indicates limited future availability; procurement should prioritize current inventory (2000 units in stock). Electrical parameters align with K2502G requirements for transient suppression in the 220–280V range. Identical hold current rating (150 mA) and compatible DO-15 axial packaging enable direct circuit substitution. ROHS3 compliance maintains regulatory alignment.

Both parts carry identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications, confirming trade and export compliance equivalence.

Frequently Asked Questions (FAQ)

Q: Can TPA220 directly replace K2502G in existing circuits?

A: Yes. Both components share identical hold current (150 mA), compatible DO-15 axial packaging, and equivalent regulatory compliance. The TPA220 breakover voltage (293V) falls within acceptable tolerance for thyristor-based overvoltage protection in the 220–280V application range.

Q: What is the primary difference between K2502G and TPA220?

A: The K2502G is a SIDAC (Littelfuse), while the TPA220 is a TVS thyristor (STMicroelectronics, TRISIL™ series). Both function as transient voltage suppressors. The TPA220 specifies peak pulse current (150A at 8/20µs), whereas the K2502G specifies peak output current (1A). Product status differs: K2502G is Active; TPA220 is Last Time Buy.

Q: Are there packaging differences between these parts?

A: No. Both are supplied in DO-15 axial packaging (DO-204AC equivalent). Through-hole mounting and mechanical dimensions are identical, ensuring seamless PCB integration.

Q: What compliance certifications apply to both parts?

A: Both K2502G and TPA220 are ROHS3 compliant and REACH unaffected. Both carry EAR99 export classification and HTSUS code 8541.30.0080.

Q: Should I prioritize K2502G or TPA220 for new designs?

A: Prioritize K2502G for new designs due to Active product status and unrestricted future availability. Use TPA220 only when K2502G supply is unavailable or when Last Time Buy inventory must be consumed before discontinuation.