P0644UATP Equivalent & Substitute Parts

Part Overview

The P0644UATP is a SIDACtor® Transient Voltage Suppressor (TVS) thyristor manufactured by Littelfuse Inc., designed for overvoltage protection in electronic circuits. This component features dual-channel protection with 58V/116V off-state voltage ratings and 150A peak pulse current capability in a 6-SMD gull wing surface mount package.

The P0644UATP is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

P0644UATP

Littelfuse Inc.In Stock: 1182P0644UATP Datasheet

Current PartRFQ

P0644UALTP

Littelfuse Inc.In Stock: 703P0644UALTP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P0644UATP is determined by electrical and mechanical parameter equivalence. The critical parameters for direct substitution are:

• Voltage ratings (breakover and off-state): 77V/154V and 58V/116V
• Peak pulse current capability: 150A (8/20µs) and 45A (10/1000µs)
• On-state voltage: 4V
• Hold current: 150 mA
• Element count: 4 channels
• Capacitance range: 35pF, 60pF
• Package configuration: 6-SMD gull wing surface mount
• Supplier device package: Modified MS-013

Parts meeting all these electrical and mechanical specifications are classified as direct equivalents and may be substituted without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

The P0644UALTP is a direct electrical and mechanical equivalent to the P0644UATP. Both components share identical voltage ratings, current specifications, element configuration, and package geometry.

The primary distinction is product status and regulatory compliance. The P0644UATP is obsolete, while the P0644UALTP maintains active production status. The P0644UALTP is ROHS3 compliant, whereas the P0644UATP is RoHS non-compliant. Both components carry identical ECCN and HTSUS classifications and maintain the same moisture sensitivity level.

For new designs or ongoing production requiring this component class, the P0644UALTP is the appropriate selection due to its active status and regulatory compliance. For legacy system maintenance where the original P0644UATP is specified, the P0644UALTP provides functional equivalence with improved compliance posture.

Frequently Asked Questions (FAQ)

Q: Can the P0644UALTP be used as a direct replacement for the P0644UATP?

A: Yes. Both components are electrically and mechanically identical across all specified parameters, including voltage ratings, current capabilities, element count, and package configuration. The P0644UALTP is the active production equivalent.

Q: What is the difference between the P0644UATP and P0644UALTP?

A: The components are functionally equivalent. The primary differences are product status (obsolete vs. active) and RoHS compliance (non-compliant vs. ROHS3 compliant). Packaging differs in that the P0644UALTP is supplied in tube format, while the P0644UATP packaging is unspecified.

Q: Are there any circuit design changes required when substituting the P0644UALTP for the P0644UATP?

A: No circuit design changes are required. Both components share identical electrical specifications and package geometry, enabling direct substitution without modification to PCB layout or circuit topology.

Q: What is the significance of the RoHS compliance difference?

A: ROHS3 compliance indicates the P0644UALTP meets current regulatory requirements for hazardous substance restrictions in electrical and electronic equipment. The P0644UATP, being non-compliant, may face restrictions in certain markets or applications subject to RoHS regulations.

Q: Is the 6-SMD gull wing package suitable for automated assembly?

A: Yes. The 6-SMD gull wing configuration is a standard surface mount package compatible with automated pick-and-place and reflow soldering processes.