Littelfuse P2500SB Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The Littelfuse P2500SB is a 230V off-state TVS thyristor in DO-214AA (SMB) surface mount package, rated for 250A peak pulse current (8/20µs). This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within the specified voltage and current parameters while meeting current manufacturing and compliance standards.

Substiute Parts

P2500SB

Littelfuse Inc.In Stock: 30428P2500SB Datasheet

Current PartRFQ

P2500SBLRP

Littelfuse Inc.In Stock: 2481P2500SBLRP Datasheet

DirectRFQ

SMP100LC-230

STMicroelectronicsIn Stock: 187787SMP100LC-230 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P2500SB is determined by the following critical parameters:

• Voltage Rating: Off-state voltage of 230V is the primary selection criterion
• Package Compatibility: DO-214AA (SMB) surface mount package ensures mechanical and thermal compatibility
• Peak Pulse Current: Minimum 250A (8/20µs) rating required for equivalent performance
• Breakover Voltage: Range of 285V–290V acceptable for circuit protection function
• On-State Voltage: Maximum 4V acceptable for voltage drop performance
• Hold Current: Minimum 120mA required for thyristor latching behavior

Two substitute parts meet these criteria: the Littelfuse P2500SBLRP (direct equivalent, active status) and the STMicroelectronics SMP100LC-230 (manufacturer-recommended alternative with enhanced current rating).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): The Littelfuse P2500SBLRP is the direct functional equivalent of the P2500SB. It maintains identical electrical specifications (290V breakover, 250A peak pulse current, 4V on-state voltage, 120mA hold current) and identical package configuration. The P2500SBLRP carries active product status and ROHS3 compliance, making it suitable for new designs and production continuity. This part is available in Tape & Reel packaging for automated assembly.

For Enhanced Performance Alternative: The STMicroelectronics SMP100LC-230 provides higher current handling capability (400A peak pulse vs. 250A) while maintaining the same 230V off-state voltage and DO-214AA package. The breakover voltage is 285V, within acceptable tolerance of the original 290V specification. This part is ROHS3 compliant and available in Cut Tape and Digi-Reel packaging. Selection of this part is appropriate when circuit design permits the higher current rating and when STMicroelectronics supply chain availability is preferred.

Frequently Asked Questions (FAQ)

Q: Can the P2500SBLRP be used as a direct drop-in replacement for the P2500SB?

A: Yes. The P2500SBLRP is electrically and mechanically identical to the P2500SB, with the same voltage ratings (230V off-state, 290V breakover), current ratings (250A peak pulse 8/20µs), on-state voltage (4V), and hold current (120mA). Both use DO-214AA (SMB) surface mount packaging. The primary difference is product status: P2500SBLRP is active and ROHS3 compliant.

Q: What is the difference between the P2500SBLRP and SMP100LC-230?

A: Both parts operate at 230V off-state voltage in DO-214AA packages. The P2500SBLRP matches the original P2500SB exactly (250A peak pulse, 290V breakover). The SMP100LC-230 offers higher current capacity (400A peak pulse, 100A 10/1000µs) and slightly lower breakover voltage (285V). The SMP100LC-230 is manufactured by STMicroelectronics rather than Littelfuse.

Q: Are there packaging differences between these substitutes?

A: Yes. The P2500SB was supplied in bulk packaging. The P2500SBLRP is available in Tape & Reel (TR) format for automated assembly. The SMP100LC-230 is available in Cut Tape (CT) and Digi-Reel® formats. All three parts use the same DO-214AA (SMB) surface mount package footprint.

Q: Does the higher current rating of the SMP100LC-230 affect circuit compatibility?

A: The SMP100LC-230 has higher current capacity (400A vs. 250A) and higher hold current (150mA vs. 120mA). These parameters do not create incompatibility; they represent enhanced performance margins. Circuit operation remains within specification as long as the 230V off-state voltage and DO-214AA package requirements are met.

Q: What is the significance of the breakover voltage difference (290V vs. 285V)?

A: Both values fall within the normal tolerance range for 230V off-state TVS thyristors. The 5V difference does not affect circuit protection function. Both parts trigger at voltages above the 230V off-state rating, providing equivalent transient suppression performance.

Q: Are all three parts RoHS compliant?

A: The P2500SB is RoHS non-compliant. Both the P2500SBLRP and SMP100LC-230 are ROHS3 compliant, meeting current environmental and regulatory requirements for new production.