K2500S Equivalent & Substitute Parts

Part Overview

The K2500S is a SIDAC thyristor manufactured by Littelfuse Inc., rated for 240–280V breakover voltage with 1A peak output current in a DO-214AA/SMB surface mount package. The device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. Substitute parts must maintain electrical compatibility across breakover voltage, hold current, and peak output specifications while supporting the same package form factor.

Substiute Parts

K2500S

Littelfuse Inc.In Stock: 1149K2500S Datasheet

Current PartRFQ

K2500SRP

Littelfuse Inc.In Stock: 3740K2500SRP Datasheet

DirectRFQ

SMP100LC-200

STMicroelectronicsIn Stock: 17673SMP100LC-200 Datasheet

MFR RecommendedRFQ

SMP100MC-200

STMicroelectronicsIn Stock: 32947SMP100MC-200 Datasheet

MFR RecommendedRFQ

SMP80MC-200

STMicroelectronicsIn Stock: 112616SMP80MC-200 Datasheet

MFR RecommendedRFQ

SMTPA200

STMicroelectronicsIn Stock: 3636SMTPA200 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

• Breakover Voltage Range: Substitute parts must operate within or overlap the 240–280V specification of the K2500S
• Hold Current (Ih): Maximum hold current must not exceed 150 mA
• Package Compatibility: All substitutes must use DO-214AA/SMB surface mount packaging
• RoHS Compliance: All substitutes must maintain ROHS3 compliance
• Electrical Function: Substitutes must function as thyristor devices capable of transient voltage suppression or SIDAC operation

The K2500SRP is a direct equivalent from Littelfuse Inc., identical in all electrical and mechanical specifications but supplied in Tape & Reel packaging with active product status. The STMicroelectronics TRISIL™ series parts (SMP100LC-200, SMP100MC-200, SMP80MC-200, SMTPA200) are TVS thyristors with breakover voltages in the 250–267V range, compatible hold currents, and identical package specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: K2500SRP is the recommended first choice. It is manufactured by Littelfuse Inc., maintains identical electrical specifications to the K2500S, and carries active product status with confirmed inventory availability. The only difference is packaging format (Tape & Reel vs. bulk), which does not affect electrical performance.

Secondary Substitutes: The STMicroelectronics TRISIL™ series parts (SMP100LC-200, SMP100MC-200, SMP80MC-200, SMTPA200) are functionally compatible alternatives. All maintain the required 150 mA hold current specification and operate within acceptable breakover voltage ranges (250–267V). These parts are actively manufactured with substantial inventory levels and full ROHS3 compliance. Selection among these variants should be based on specific peak pulse current requirements for the application.

All substitute parts are ROHS3 compliant and carry REACH Unaffected status, meeting regulatory requirements for new designs.

Frequently Asked Questions (FAQ)

Q: Can K2500SRP be used as a direct replacement for K2500S? A: Yes. K2500SRP is electrically and mechanically identical to K2500S. The only difference is packaging format (Tape & Reel). Both maintain 240–280V breakover voltage, 150 mA hold current, and DO-214AA/SMB package specifications.

Q: Are STMicroelectronics TRISIL™ parts compatible with K2500S applications? A: Yes, within the specified electrical parameters. All TRISIL™ substitutes (SMP100LC-200, SMP100MC-200, SMP80MC-200, SMTPA200) maintain the 150 mA hold current requirement and operate at breakover voltages within 250–267V, which overlaps the K2500S 240–280V specification. Package form factor is identical (DO-214AA/SMB).

Q: What is the difference between SMP100LC-200, SMP100MC-200, and SMP80MC-200? A: These parts differ in peak pulse current ratings. SMP100LC-200 handles 400A peak pulse (8/20µs), SMP100MC-200 handles 300A, and SMP80MC-200 handles 200A. All three maintain identical breakover voltage (250–255V), hold current (150 mA), and package specifications. Selection depends on the transient current levels in your application.

Q: Is SMTPA200 suitable for K2500S replacement? A: Yes. SMTPA200 meets all substitution criteria with 267V breakover voltage, 150 mA hold current, and DO-214AA/SMB packaging. It is rated for 150A peak pulse current, making it suitable for lower-current transient suppression applications.

Q: Do all substitute parts meet RoHS compliance? A: Yes. All listed substitutes are ROHS3 compliant and REACH Unaffected, meeting regulatory requirements for new product designs and manufacturing.

Q: What packaging options are available for substitutes? A: All substitute parts are supplied in Tape & Reel (TR) packaging for automated assembly. The DO-214AA/SMB package form factor is consistent across all options, ensuring PCB footprint compatibility.