Littelfuse P0900SB TVS Thyristor Equivalent & Substitute Parts

Part Overview

The Littelfuse P0900SB is a 75V off-state, 250A peak pulse TVS thyristor in DO-214AA (SMB) 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 P0900SB provides transient voltage suppression for circuit protection applications requiring high current handling capability in a compact surface mount form factor.

Substiute Parts

P0900SB

Littelfuse Inc.In Stock: 30363P0900SB Datasheet

Current PartRFQ

P0900SBLRP

Littelfuse Inc.In Stock: 2244P0900SBLRP Datasheet

DirectRFQ

SMP100LC-90

STMicroelectronicsIn Stock: 1946SMP100LC-90 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P0900SB TVS thyristor is determined by electrical and mechanical compatibility within the following parameters:

Critical Substitution Parameters:

• Package / Case: DO-214AA, SMB (physical and electrical interface compatibility)
• Mounting Type: Surface Mount (assembly process compatibility)
• Number of Elements: 1 (functional equivalence)
• Current - Hold (Ih): 150mA (holding current requirement)
• Voltage - Off State: 75V nominal (primary voltage rating)
• Voltage - Breakover: 98V nominal (trigger voltage range)

Allowable Variation Parameters:

• Current - Peak Pulse (8/20µs): ≥250A (equal or higher current handling)
• Current - Peak Pulse (10/1000µs): ≥80A (equal or higher current handling)
• Capacitance: ±20pF variation acceptable (parasitic capacitance tolerance)
• Voltage - On State: ±1V variation acceptable (forward voltage tolerance)

Two substitute parts meet these criteria: the Littelfuse P0900SBLRP (direct manufacturer equivalent) and the STMicroelectronics SMP100LC-90 (cross-manufacturer alternative with enhanced specifications).

Parameter Comparison

Engineering Selection Recommendations

P0900SBLRP (Littelfuse Inc.): This is the direct manufacturer equivalent to the obsolete P0900SB. It maintains identical electrical specifications (75V off-state, 98V breakover, 250A peak pulse current, 150mA holding current) and package form factor. The P0900SBLRP is active in production with ROHS3 compliance and REACH unaffected status. Capacitance is slightly elevated at 70pF versus 50pF in the original part. This substitute is recommended for direct replacement in existing designs without circuit modification.

SMP100LC-90 (STMicroelectronics): This cross-manufacturer alternative provides enhanced electrical performance with 90V off-state voltage, 125V breakover voltage, and increased current handling (400A peak pulse at 8/20µs, 100A at 10/1000µs). The SMP100LC-90 maintains the same 150mA holding current and DO-214AA package compatibility. Capacitance is 80pF. This part is active in production with ROHS3 compliance and REACH unaffected status. Selection of this substitute requires circuit analysis to confirm that the higher voltage ratings are compatible with the application's transient suppression requirements.

Frequently Asked Questions (FAQ)

Q: Can the P0900SBLRP directly replace the obsolete P0900SB without circuit modification?

A: Yes. The P0900SBLRP is electrically and mechanically identical to the P0900SB, maintaining the same voltage ratings (75V off-state, 98V breakover), current specifications (250A peak pulse at 8/20µs), and DO-214AA package. The slight capacitance increase (70pF vs. 50pF) is within acceptable tolerance for most applications. No circuit redesign is required.

Q: What are the key differences between the P0900SBLRP and SMP100LC-90?

A: The primary differences are manufacturer (Littelfuse vs. STMicroelectronics), voltage ratings (75V/98V vs. 90V/125V off-state/breakover), and current handling (250A/80A vs. 400A/100A peak pulse). Both maintain identical 150mA holding current and DO-214AA package compatibility. The SMP100LC-90 offers higher performance specifications suitable for applications requiring enhanced transient suppression capability.

Q: Is the SMP100LC-90 suitable for applications designed for the P0900SB?

A: The SMP100LC-90 can be used in applications originally designed for the P0900SB provided that the higher voltage ratings (90V off-state, 125V breakover) do not conflict with the circuit's voltage suppression strategy. The increased current handling (400A vs. 250A) provides additional margin. Circuit analysis is required to confirm compatibility with the specific application's transient voltage profile.

Q: Are all three parts available in the same packaging format?

A: The P0900SB is available in bulk packaging. Both the P0900SBLRP and SMP100LC-90 are supplied in Tape & Reel (TR) format for automated assembly. This packaging difference does not affect electrical or mechanical compatibility; it reflects production and supply chain considerations.

Q: What compliance certifications apply to these substitute parts?

A: The obsolete P0900SB is RoHS non-compliant. Both active substitutes, P0900SBLRP and SMP100LC-90, are ROHS3 compliant and REACH unaffected. For applications requiring RoHS compliance, either substitute part is acceptable.

Q: Can these parts be used interchangeably in the same PCB assembly?

A: Yes, all three parts share identical DO-214AA (SMB) package and surface mount compatibility. PCB layout and footprint design do not require modification when substituting between these parts. Solder reflow parameters remain unchanged.