P1556UCTP Equivalent & Substitute Parts

Part Overview

The P1556UCTP is a 130V off-state, 400A peak pulse TVS thyristor manufactured by Littelfuse Inc. in the SIDACtor® series. This component is designed for transient voltage suppression applications requiring high current handling in a compact 6-SMD gull wing package. The part is currently obsolete, making identification of suitable substitutes necessary for ongoing system support and new design implementations.

Substiute Parts

P1556UCTP

Littelfuse Inc.In Stock: 805P1556UCTP Datasheet

Current PartRFQ

P1556UCLTP

Littelfuse Inc.In Stock: 1074P1556UCLTP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P1556UCTP is determined by matching the following critical electrical and mechanical parameters:

• Voltage - Off State: 130V
• Voltage - Breakover: 180V
• Voltage - On State: 8V
• Current - Peak Pulse (8/20µs): 400A
• Current - Peak Pulse (10/1000µs): 100A
• Current - Hold (Ih): 150mA
• Number of Elements: 6
• Capacitance: 35pF, 55pF
• Package / Case: 6-SMD, Gull Wing
• Mounting Type: Surface Mount

The P1556UCLTP meets all these criteria and is therefore a direct electrical and mechanical equivalent.

Parameter Comparison

Engineering Selection Recommendations

The P1556UCLTP is the direct substitute for the obsolete P1556UCTP. Both components share identical electrical specifications and mechanical packaging. The primary distinction is product status and regulatory compliance: the P1556UCLTP is an active product with ROHS3 compliance, whereas the P1556UCTP is obsolete and RoHS non-compliant. For new designs and ongoing system support, the P1556UCLTP is the appropriate selection. The P1556UCLTP is supplied in tube packaging, which differs from the unspecified packaging of the original part.

Frequently Asked Questions (FAQ)

Q: Can the P1556UCLTP directly replace the P1556UCTP in existing designs?

A: Yes. The P1556UCLTP is electrically and mechanically identical to the P1556UCTP across all specified parameters, including voltage ratings, current handling, element count, capacitance, and 6-SMD gull wing package configuration.

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

A: The primary differences are product status and compliance. The P1556UCTP is obsolete and RoHS non-compliant, while the P1556UCLTP is an active product with ROHS3 compliance. Packaging differs: P1556UCLTP is supplied in tube format.

Q: Are there any electrical performance differences?

A: No. Both parts maintain identical electrical characteristics: 130V off-state voltage, 180V breakover voltage, 8V on-state voltage, 400A peak pulse current (8/20µs), 100A peak pulse current (10/1000µs), 150mA hold current, and 35pF/55pF capacitance.

Q: Is the P1556UCLTP suitable for new product designs?

A: Yes. The P1556UCLTP is an active product with current manufacturing support and ROHS3 compliance, making it the appropriate choice for new designs requiring this TVS thyristor specification.

Q: Does packaging format affect electrical performance?

A: No. The tube packaging of the P1556UCLTP does not affect electrical performance or functionality. Packaging format is a logistics and handling consideration only.