P3500SC Equivalent & Substitute Parts

Part Overview

The P3500SC is a Transient Voltage Suppressor (TVS) thyristor manufactured by Littelfuse, designed for overvoltage protection in surface-mount applications. This component operates as a SIDACtor® device with a 320V off-state voltage rating and 400A peak pulse current capability in a DO-214AA (SMB) package. The P3500SC is classified as obsolete, necessitating identification of equivalent or substitute components for new designs and ongoing production requirements.

Substiute Parts

P3500SC

LittelfuseIn Stock: 196739P3500SC Datasheet

Current PartRFQ

P3500SCLRP

Littelfuse Inc.In Stock: 55207P3500SCLRP Datasheet

DirectRFQ

SMP100LC-270

STMicroelectronicsIn Stock: 27501SMP100LC-270 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P3500SC is determined by the following critical parameters:

• Voltage - Off State: 320V (primary voltage rating)
• Voltage - Breakover: 400V (trigger threshold)
• Current - Peak Pulse (8/20µs): 400A (surge handling capacity)
• Current - Hold (Ih): 150mA (holding current)
• Package / Case: DO-214AA, SMB (mechanical and electrical interface)
• Number of Elements: 1 (functional configuration)

Two substitute parts are identified:

1. P3500SCLRP (Littelfuse Inc.) — Direct manufacturer equivalent with identical electrical specifications and active product status.

2. SMP100LC-270 (STMicroelectronics) — Manufacturer-recommended alternative with modified voltage ratings (270V off-state, 335V breakover) and equivalent current handling.

Parameter Comparison

Engineering Selection Recommendations

P3500SCLRP is the direct equivalent substitute for P3500SC. This part maintains identical electrical specifications across all critical parameters and is manufactured by the same supplier (Littelfuse Inc.). The P3500SCLRP carries active product status and ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original P3500SC.

SMP100LC-270 is a manufacturer-recommended alternative from STMicroelectronics. This substitute operates at reduced voltage ratings (270V off-state, 335V breakover) compared to the P3500SC (320V off-state, 400V breakover). Current handling, holding current, and package configuration remain equivalent. The SMP100LC-270 is active and ROHS3 compliant. Selection of this alternative requires verification that the lower voltage ratings are compatible with the application's overvoltage protection requirements.

Frequently Asked Questions (FAQ)

Q: Can P3500SCLRP be used as a direct replacement for P3500SC?

A: Yes. P3500SCLRP is electrically and mechanically identical to P3500SC, with matching voltage ratings (320V off-state, 400V breakover), current specifications (400A peak pulse), and DO-214AA package configuration. The primary advantage is active product status and regulatory compliance.

Q: What is the difference between P3500SC and SMP100LC-270?

A: The SMP100LC-270 operates at lower voltage ratings: 270V off-state and 335V breakover, compared to P3500SC's 320V off-state and 400V breakover. Peak pulse current (400A) and holding current (150mA) are identical. Both use the DO-214AA package. The SMP100LC-270 is suitable only for applications where the reduced voltage ratings provide adequate protection margins.

Q: Are all substitute parts in the same package?

A: Yes. P3500SC, P3500SCLRP, and SMP100LC-270 all use the DO-214AA (SMB) surface-mount package, ensuring mechanical compatibility in existing PCB layouts.

Q: What is the significance of product status (Obsolete vs. Active)?

A: Obsolete status indicates the P3500SC is no longer manufactured or supported by Littelfuse. Active status for P3500SCLRP and SMP100LC-270 ensures ongoing availability, technical support, and compliance with current regulatory standards.

Q: Does RoHS compliance affect substitution decisions?

A: The P3500SC is RoHS non-compliant, while both P3500SCLRP and SMP100LC-270 are ROHS3 compliant. For applications subject to RoHS regulations, either substitute part is required. For unregulated applications, compliance status does not affect electrical performance.