NP3500SCT3G Equivalent & Substitute Parts

Part Overview

The NP3500SCT3G is a 320V off-state thyristor-based transient voltage suppressor (TVS) in DO-214AA surface mount packaging, manufactured by onsemi. This component is designed for transient overvoltage protection applications requiring 100A peak pulse current handling at 10/1000µs pulse width. The part is currently obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

NP3500SCT3G

onsemiIn Stock: 2318NP3500SCT3G Datasheet

Current PartRFQ

P3500SCLRP

Littelfuse Inc.In Stock: 55207P3500SCLRP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NP3500SCT3G is determined by matching the following critical electrical and mechanical parameters:

• Voltage Rating Match: Off-state voltage of 320V and breakover voltage of 400V must be identical
• On-State Voltage: 4V on-state voltage ensures equivalent clamping performance
• Hold Current: 150mA hold current requirement must be maintained
• Package Compatibility: DO-214AA, SMB surface mount package is mandatory for PCB layout compatibility
• Peak Pulse Current: Minimum 100A at 10/1000µs pulse width specification

The P3500SCLRP from Littelfuse Inc. meets all these substitution criteria while offering enhanced current handling capability at alternative pulse widths and active product status.

Parameter Comparison

Engineering Selection Recommendations

The P3500SCLRP is a direct functional equivalent for the obsolete NP3500SCT3G. Both components share identical voltage ratings, on-state characteristics, and hold current specifications. The P3500SCLRP offers the advantage of active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. The minor capacitance difference (65pF versus 71pF) falls within acceptable tolerance for TVS thyristor applications. Both components carry identical REACH unaffected and EAR99 export classification status.

Frequently Asked Questions (FAQ)

Q: Can the P3500SCLRP directly replace the NP3500SCT3G in existing designs?

A: Yes. Both components share identical voltage ratings (320V off-state, 400V breakover), on-state voltage (4V), hold current (150mA), and package format (DO-214AA, SMB). No circuit modifications are required.

Q: What is the significance of the different peak pulse current specifications listed for P3500SCLRP?

A: The P3500SCLRP specifies 400A at 8/20µs pulse width and 100A at 10/1000µs pulse width. The 10/1000µs specification matches the NP3500SCT3G requirement of 100A, confirming compatibility for the intended application.

Q: Does the capacitance difference between the two parts affect circuit performance?

A: The capacitance values (71pF for NP3500SCT3G and 65pF for P3500SCLRP) are within typical component tolerances for TVS thyristors and do not affect substitution suitability for standard transient protection applications.

Q: Why is product status relevant for component selection?

A: The NP3500SCT3G is obsolete, meaning onsemi no longer manufactures or supports this part. The P3500SCLRP is active, ensuring continued availability, technical support, and compliance with current regulatory standards.

Q: Are there any compliance or certification differences between these parts?

A: The P3500SCLRP carries ROHS3 compliance certification, while the NP3500SCT3G does not specify RoHS status. Both parts are REACH unaffected and carry EAR99 export classification. The P3500SCLRP is the preferred choice for applications requiring documented RoHS compliance.