Littelfuse P3100SA TVS Thyristor Equivalent & Substitute Parts

Part Overview

The Littelfuse P3100SA is a 275V off-state, 150A peak pulse (8/20µs) transient voltage suppressor thyristor in DO-214AA surface mount package, part of the SIDACtor® series. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The P3100SA provides transient voltage suppression for circuit protection applications requiring high current handling capability in a compact SMB package format.

Substiute Parts

P3100SA

Littelfuse Inc.In Stock: 10398P3100SA Datasheet

Current PartRFQ

P3100SALRP

Littelfuse Inc.In Stock: 35476P3100SALRP Datasheet

DirectRFQ

SMTPA270

STMicroelectronicsIn Stock: 4219SMTPA270 Datasheet

MFR RecommendedRFQ

TISP4350T3BJR-S

Bourns Inc.In Stock: 6161TISP4350T3BJR-S Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS thyristor components is determined by the following critical parameters:

• Voltage Rating (Off-State & Breakover): Must match or exceed the original specification to ensure proper transient suppression without premature triggering
• Peak Pulse Current (8/20µs): Must meet or exceed the original rating to handle the specified transient energy
• Package / Case Format: Must be identical (DO-214AA, SMB) to ensure mechanical and electrical compatibility with existing PCB layouts
• Mounting Type: Must be surface mount to maintain assembly process compatibility
• Hold Current (Ih): Must be compatible with circuit operating conditions

Substitute parts are grouped into two categories: direct manufacturer equivalents from Littelfuse and cross-manufacturer alternatives that meet the electrical and mechanical requirements.

Parameter Comparison

Engineering Selection Recommendations

P3100SALRP (Littelfuse Inc.): Direct manufacturer equivalent with identical electrical specifications. Offers the closest functional match with active product status and ROHS3 compliance. Recommended as the primary substitute for P3100SA obsolescence replacement.

SMTPA270 (STMicroelectronics): Cross-manufacturer alternative with 270V off-state rating (5V lower than original) and equivalent 150A peak pulse current. Meets package and mounting requirements. ROHS3 compliant with active status. Suitable where the slightly lower voltage rating is acceptable within circuit design margins.

TISP4350T3BJR-S (Bourns Inc.): Cross-manufacturer alternative with higher peak pulse current capability (250A vs. 150A) and matching 275V off-state voltage. Provides enhanced transient handling capacity. ROHS3 compliant with active status. Suitable for applications requiring increased current margin or where higher transient energy absorption is beneficial.

Frequently Asked Questions (FAQ)

Q: Can P3100SALRP be used as a direct replacement for P3100SA? A: Yes. P3100SALRP is a direct manufacturer equivalent with identical voltage ratings, peak pulse current, hold current, and package format. The primary difference is active product status and ROHS3 compliance versus the obsolete P3100SA.

Q: What is the difference between the 8/20µs and 10/1000µs pulse specifications? A: These represent different transient waveform profiles. The 8/20µs pulse simulates fast transients (typical of ESD and switching events), while 10/1000µs represents slower, longer-duration transients. Both specifications must be evaluated for your application.

Q: Is SMTPA270 compatible with P3100SA applications? A: SMTPA270 is mechanically and functionally compatible in DO-214AA SMB package format. The 270V off-state rating is 5V lower than the P3100SA. Compatibility depends on whether your circuit design can tolerate this voltage difference. Verify that the lower voltage does not compromise transient suppression performance in your specific application.

Q: Why does TISP4350T3BJR-S have higher peak pulse current than P3100SA? A: TISP4350T3BJR-S is rated for 250A peak pulse (8/20µs) compared to P3100SA's 150A. This represents a higher current handling capability and may provide additional design margin in transient suppression circuits. The higher capacitance (52pF vs. 30pF) should be evaluated for frequency-dependent circuit behavior.

Q: Are all substitute parts RoHS compliant? A: P3100SALRP, SMTPA270, and TISP4350T3BJR-S are all ROHS3 compliant. The original P3100SA is RoHS non-compliant. Compliance status should be verified against your procurement and regulatory requirements.

Q: Can these parts be used interchangeably on the same PCB? A: All substitute parts use identical DO-214AA SMB package format and surface mount configuration, enabling direct PCB footprint compatibility. However, electrical parameter differences (particularly voltage and current ratings) must be validated against circuit design specifications before interchangeable use.