P1803UCTP Equivalent & Substitute Parts

Part Overview

The P1803UCTP is a 150V off-state TVS thyristor from Littelfuse Inc.'s SIDACtor® series, designed for transient voltage suppression applications. This component features a 6-SMD gull wing package with 400 A peak pulse current capability (8/20µs) and is rated for 150 mA hold current across three integrated elements.

The P1803UCTP is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

P1803UCTP

Littelfuse Inc.In Stock: 759P1803UCTP Datasheet

Current PartRFQ

P1803UCLTP

Littelfuse Inc.In Stock: 1028P1803UCLTP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P1803UCTP is determined by electrical and mechanical parameter equivalence. The following parameters must remain constant for direct substitution:

• Voltage - Breakover: 210V
• Voltage - Off State: 150V
• Voltage - On State: 8V
• Current - Peak Pulse (8/20µs): 400A
• Current - Peak Pulse (10/1000µs): 100A
• Current - Hold (Ih): 150mA
• Number of Elements: 3
• Capacitance: 55pF, 85pF
• Package / Case: 6-SMD, Gull Wing
• Mounting Type: Surface Mount

The P1803UCLTP meets all these electrical and mechanical requirements and is therefore classified as a direct equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

The P1803UCLTP is the direct equivalent substitute for the P1803UCTP. Both parts are manufactured by Littelfuse Inc. and share identical electrical and mechanical specifications across all critical parameters.

The P1803UCLTP offers the following advantages:

• Active product status ensures ongoing availability and manufacturing support
• ROHS3 compliance meets current environmental and regulatory requirements
• Tube packaging provides standard handling and storage compatibility

Selection of the P1803UCLTP is appropriate for all applications previously designed with the P1803UCTP, with no circuit redesign or validation required.

Frequently Asked Questions (FAQ)

Q: Can the P1803UCLTP be used as a direct replacement for the P1803UCTP?

A: Yes. The P1803UCLTP is electrically and mechanically equivalent to the P1803UCTP. All voltage ratings, current specifications, element count, capacitance values, and package dimensions are identical.

Q: What is the difference between the P1803UCTP and P1803UCLTP?

A: The primary differences are product status and compliance. The P1803UCTP is obsolete and RoHS non-compliant. The P1803UCLTP is an active product with ROHS3 compliance. Packaging differs: P1803UCLTP is supplied in tube format.

Q: Are there any circuit modifications required when switching from P1803UCTP to P1803UCLTP?

A: No circuit modifications are required. The electrical performance and pinout are identical, allowing direct substitution in existing designs.

Q: Does the tube packaging of the P1803UCLTP affect compatibility?

A: Tube packaging is a standard format for surface mount components and does not affect electrical performance or PCB assembly compatibility. Packaging format only impacts handling, storage, and automated pick-and-place equipment configuration.

Q: Are both parts suitable for the same voltage suppression applications?

A: Yes. Both the P1803UCTP and P1803UCLTP are rated for 150V off-state operation with 210V breakover voltage and 400A peak pulse current capability. They are suitable for identical transient voltage suppression applications.