P3100SB Equivalent & Substitute Parts

Part Overview

The P3100SB is a Transient Voltage Suppressor (TVS) thyristor manufactured by Littelfuse, designed for overvoltage protection in surface mount applications. This component operates at 275V off-state voltage with 250A peak pulse current capability in a DO-214AA (SMB) package. The P3100SB is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and mechanical packaging to ensure proper circuit protection performance.

Substiute Parts

P3100SB

LittelfuseIn Stock: 15803P3100SB Datasheet

Current PartRFQ

P3100SBLRP

Littelfuse Inc.In Stock: 119152P3100SBLRP Datasheet

DirectRFQ

SMP100LC-270

STMicroelectronicsIn Stock: 27501SMP100LC-270 Datasheet

MFR RecommendedRFQ

TISP4350T3BJR-S

Bourns Inc.In Stock: 6161TISP4350T3BJR-S Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P3100SB are selected based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Voltage - Off State: 270V to 275V range
• Voltage - Breakover: 335V to 350V range
• Current - Peak Pulse (8/20µs): minimum 250A
• Package / Case: DO-214AA, SMB (surface mount)
• Number of Elements: 1
• Mounting Type: Surface Mount

Substitute Classification:

P3100SBLRP (Littelfuse) - Direct manufacturer equivalent with identical electrical specifications and active product status. Differs only in packaging format (Tape & Reel vs. bulk).

SMP100LC-270 (STMicroelectronics) - Functionally compatible substitute with 270V off-state voltage and 400A peak pulse current capability, exceeding the original 250A requirement. Breakover voltage of 335V falls within acceptable range.

TISP4350T3BJR-S (Bourns Inc.) - Functionally compatible substitute with identical 275V off-state voltage and 250A peak pulse current. Electrical characteristics match the original specification within tolerance.

Parameter Comparison

Engineering Selection Recommendations

P3100SBLRP is the primary substitute choice. This part maintains identical electrical specifications to the P3100SB while offering active product status and ROHS3 compliance. The only difference is packaging format (Tape & Reel), which does not affect electrical performance. This substitute provides direct compatibility with existing designs.

SMP100LC-270 is a secondary substitute option. While manufactured by STMicroelectronics rather than Littelfuse, it meets all critical substitution parameters with 270V off-state voltage and 400A peak pulse current. The higher current rating provides additional design margin. Capacitance is 60pF versus 45pF in the original, which may require circuit evaluation in timing-sensitive applications. ROHS3 compliance and active product status are confirmed.

TISP4350T3BJR-S is a tertiary substitute option. This Bourns component matches the P3100SB electrical specifications precisely, including 275V off-state voltage and 250A peak pulse current. ROHS3 compliance and active product status are confirmed. REACH status is listed as affected, requiring compliance verification for specific end-use applications.

All three substitutes are available in active production with confirmed inventory levels and meet the DO-214AA, SMB package requirement for direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can P3100SBLRP be used as a direct replacement for P3100SB?

A: Yes. P3100SBLRP is electrically identical to P3100SB with matching voltage ratings (275V off-state, 350V breakover), current ratings (250A peak pulse), and on-state voltage (4V). The difference is packaging format (Tape & Reel vs. bulk). Both use DO-214AA, SMB package for surface mount assembly.

Q: What is the key difference between SMP100LC-270 and the original P3100SB?

A: SMP100LC-270 has a 270V off-state voltage (5V lower than P3100SB) and 400A peak pulse current (150A higher than P3100SB). Breakover voltage is 335V versus 350V. Capacitance is 60pF versus 45pF. These differences must be evaluated in the specific circuit application to confirm compatibility.

Q: Are all substitute parts RoHS compliant?

A: P3100SBLRP, SMP100LC-270, and TISP4350T3BJR-S are all ROHS3 compliant. The original P3100SB is RoHS non-compliant. Compliance status should be verified against end-product requirements.

Q: Do all substitutes use the same package?

A: Yes. All substitute parts use DO-214AA, SMB package for surface mount applications. PCB footprint compatibility is maintained across all options.

Q: What is the inventory status of each substitute?

A: P3100SBLRP has 119,050 units in stock. SMP100LC-270 has 27,458 units in stock. TISP4350T3BJR-S has 6,062 units in stock. Availability should be confirmed with suppliers for production requirements.

Q: Does capacitance variation affect circuit performance?

A: Capacitance differences (45pF original, 45pF P3100SBLRP, 60pF SMP100LC-270, 52pF TISP4350T3BJR-S) may impact high-frequency circuit behavior and timing characteristics. Circuit simulation or testing is necessary to confirm performance in applications where capacitance is a critical parameter.

Q: What is the difference between P3100SB and P3100SBLRP packaging?

A: P3100SB is supplied in bulk packaging. P3100SBLRP is supplied in Tape & Reel (TR) format for automated assembly. Electrical specifications are identical. Tape & Reel format is standard for high-volume production environments.