P0644UBTP Equivalent & Substitute Parts

Part Overview

The P0644UBTP is a SIDACtor® Transient Voltage Suppressor (TVS) thyristor manufactured by Littelfuse Inc., designed for overvoltage protection in surface mount applications. This component features dual-channel protection with 58V/116V off-state voltage ratings and 250A peak pulse current capability in a 6-SMD Gull Wing package.

The P0644UBTP is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

P0644UBTP

Littelfuse Inc.In Stock: 785P0644UBTP Datasheet

Current PartRFQ

P0644UBLTP

Littelfuse Inc.In Stock: 1172P0644UBLTP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P0644UBTP is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

• Voltage ratings (breakover and off-state) must match exactly: 77V/154V breakover and 58V/116V off-state
• Peak pulse current capability must meet or exceed 250A (8/20µs) and 80A (10/1000µs)
• On-state voltage must not exceed 4V
• Hold current (Ih) must be 150 mA or greater
• Number of elements must be 4
• Capacitance values must be 90pF and 155pF
• Package configuration must be 6-SMD, Gull Wing
• Mounting type must be Surface Mount
• Supplier device package must be Modified MS-013

The P0644UBLTP meets all these criteria and is classified as a direct manufacturer equivalent.

Parameter Comparison

Engineering Selection Recommendations

The P0644UBLTP is the direct electrical and mechanical equivalent of the P0644UBTP. Both components share identical electrical specifications and package configuration. The primary distinction is product status and regulatory compliance.

The P0644UBTP is obsolete, whereas the P0644UBLTP is active and in production. The P0644UBLTP carries ROHS3 compliance certification, whereas the P0644UBTP is non-compliant. For new designs or ongoing production requiring regulatory compliance, the P0644UBLTP is the appropriate selection. Both components feature unlimited moisture sensitivity level (MSL 1), indicating no special storage or handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the P0644UBLTP be used as a direct replacement for the P0644UBTP?

A: Yes. The P0644UBLTP is electrically and mechanically identical to the P0644UBTP. All voltage ratings, current specifications, capacitance values, and package dimensions are equivalent. The components are pin-compatible and functionally interchangeable in circuit applications.

Q: What is the difference between the P0644UBTP and P0644UBLTP?

A: The primary differences are product status and packaging format. The P0644UBTP is obsolete and supplied in standard packaging, while the P0644UBLTP is active and supplied in tube packaging. The P0644UBLTP also carries ROHS3 compliance certification. Electrical and mechanical specifications are identical.

Q: Why is the P0644UBTP classified as obsolete?

A: Littelfuse Inc. has discontinued the P0644UBTP in favor of the P0644UBLTP, which offers improved regulatory compliance and active production support. The P0644UBLTP provides the same electrical performance with ROHS3 certification.

Q: Are there any compatibility concerns when substituting the P0644UBLTP for the P0644UBTP?

A: No compatibility concerns exist. Both components use the 6-SMD Gull Wing package with Modified MS-013 supplier device package specification. PCB footprints, solder pad layouts, and mounting procedures are identical. No circuit modifications or design changes are required.

Q: What does MSL 1 (Unlimited) mean for these components?

A: MSL 1 indicates the lowest moisture sensitivity level. These components have unlimited shelf life and require no special moisture control or baking procedures prior to soldering. Standard storage conditions are acceptable.