P0644UCTP Equivalent & Substitute Parts

Part Overview

The P0644UCTP is a Transient Voltage Suppressor (TVS) thyristor from Littelfuse Inc., part of the SIDACtor® series. This component is designed for overvoltage protection applications requiring high peak pulse current handling. The part is currently classified as obsolete, making identification of suitable substitutes essential for ongoing system support and new design implementations. The P0644UCTP operates with dual voltage ratings (58V/116V off-state) and handles 400 A peak pulse current in an 8/20µs waveform, packaged in a 6-SMD gull wing surface mount configuration.

Substiute Parts

P0644UCTP

Littelfuse Inc.In Stock: 1076P0644UCTP Datasheet

Current PartRFQ

P0644UCLTP

Littelfuse Inc.In Stock: 1181P0644UCLTP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P0644UCTP is determined by strict equivalence across the following critical parameters:

• Voltage ratings (breakover and off-state): 77V/154V and 58V/116V respectively
• Peak pulse current capacity: 400 A at 8/20µs waveform
• Hold current: 150 mA minimum
• Number of elements: 4-element configuration
• Mounting and package type: 6-SMD gull wing surface mount
• Supplier device package: Modified MS-013

The P0644UCLTP meets all these criteria and qualifies as a direct substitute. The primary distinction between these parts is packaging format (tube versus unspecified for the original) and product status (active versus obsolete), along with minor capacitance variations that do not affect functional substitution.

Parameter Comparison

Engineering Selection Recommendations

The P0644UCLTP is the direct functional equivalent to the P0644UCTP. Both parts share identical electrical specifications across all critical parameters: voltage ratings, current handling capacity, and hold current requirements. The P0644UCLTP is preferred for new designs and ongoing production due to its active product status and ROHS3 compliance certification. The original P0644UCTP, classified as obsolete, should be replaced with the P0644UCLTP in all applications where component procurement is required. The tube packaging of the P0644UCLTP accommodates standard automated assembly processes without modification to existing pick-and-place equipment configurations.

Frequently Asked Questions (FAQ)

Q: Can the P0644UCLTP be used as a direct replacement for the P0644UCTP in existing designs?

A: Yes. The P0644UCLTP is electrically and mechanically equivalent to the P0644UCTP across all functional parameters. Both parts operate at identical voltage ratings (58V/116V off-state, 77V/154V breakover), handle 400 A peak pulse current, and use the same 6-SMD gull wing package. No circuit modifications are required.

Q: What is the difference between these two part numbers?

A: The primary differences are product status and compliance certification. The P0644UCTP is obsolete, while the P0644UCLTP is active. The P0644UCLTP carries ROHS3 compliance, whereas the P0644UCTP is non-compliant. Packaging format differs (tube for P0644UCLTP), but the electrical and mechanical specifications are identical.

Q: Are there any capacitance differences between these parts?

A: The P0644UCTP specifies 35pF and 60pF capacitance values, while the P0644UCLTP specifies 90pF and 155pF. These variations do not affect substitution eligibility, as capacitance is not a limiting parameter for TVS thyristor functional equivalence in overvoltage protection applications.

Q: Is the P0644UCLTP compatible with existing PCB layouts designed for the P0644UCTP?

A: Yes. Both parts use the 6-SMD gull wing package with Modified MS-013 supplier device package specification. PCB footprints, solder pad configurations, and mounting requirements are identical. No layout modifications are necessary.

Q: Why should I transition from P0644UCTP to P0644UCLTP?

A: The P0644UCTP is obsolete and subject to discontinuation. The P0644UCLTP provides continued availability, active product support, and ROHS3 compliance for regulatory requirements. Transitioning to the active part number ensures long-term supply chain stability and compliance with environmental standards.