P3500SD Equivalent & Substitute Parts

Part Overview

The P3500SD is a 320V off-state, 1 kA peak pulse TVS thyristor manufactured by Littelfuse in the SIDACtor® series, housed in a DO-214AA (SMB) surface mount package. This component is designed for transient voltage suppression applications requiring high current handling capability. The P3500SD is currently classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

P3500SD

LittelfuseIn Stock: 952P3500SD Datasheet

Current PartRFQ

P3500SDLRP

Littelfuse Inc.In Stock: 2468P3500SDLRP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P3500SD is determined by strict equivalence across all electrical and mechanical parameters. The following criteria define valid substitutes:

• Voltage - Breakover: 400V
• Voltage - Off State: 320V
• Voltage - On State: 4V
• Current - Peak Pulse (8/20µs): 1 kA
• Current - Peak Pulse (10/1000µs): 200A
• Current - Hold (Ih): 50 mA
• Capacitance: 65 pF
• Package / Case: DO-214AA, SMB
• Number of Elements: 1
• Mounting Type: Surface Mount

The P3500SDLRP meets all electrical specifications and mechanical requirements, differing only in packaging format (Tape & Reel versus bulk) and product status (Active versus Obsolete).

Parameter Comparison

Engineering Selection Recommendations

The P3500SDLRP is the direct functional equivalent of the P3500SD. Both components are members of the Littelfuse SIDACtor® series and share identical electrical and mechanical specifications. The P3500SDLRP is classified as Active product status, ensuring continued availability and manufacturing support. Additionally, the P3500SDLRP carries ROHS3 compliance, whereas the P3500SD is RoHS non-compliant. For new designs or ongoing procurement, the P3500SDLRP is the appropriate selection. The primary distinction is packaging format: P3500SDLRP is supplied in Tape & Reel format, suitable for automated assembly processes, while the P3500SD was supplied in bulk packaging.

Frequently Asked Questions (FAQ)

Q: Can the P3500SDLRP be used as a direct replacement for the P3500SD?

A: Yes. The P3500SDLRP is electrically and mechanically identical to the P3500SD across all specified parameters, including voltage ratings, current handling, capacitance, and package type (DO-214AA, SMB).

Q: What is the difference between P3500SD and P3500SDLRP?

A: The components are functionally equivalent. The primary differences are product status (P3500SD is Obsolete; P3500SDLRP is Active), RoHS compliance (P3500SDLRP is ROHS3 compliant), and packaging format (P3500SDLRP is supplied in Tape & Reel format for automated assembly).

Q: Are there any compatibility concerns when substituting P3500SDLRP for P3500SD?

A: No compatibility concerns exist. Both components use the same DO-214AA (SMB) surface mount package and are pin-for-pin equivalent. PCB layout and assembly processes require no modification.

Q: Why is the P3500SD classified as obsolete?

A: The P3500SD has been superseded by the P3500SDLRP, which offers improved compliance status and active manufacturing support through Littelfuse.

Q: What does Tape & Reel packaging mean?

A: Tape & Reel (TR) packaging is a standardized format for surface mount components, where parts are affixed to a continuous carrier tape wound on a reel. This format is optimized for high-volume automated assembly processes and is the industry standard for production environments.