SK040NTP Equivalent & Substitute Parts

Part Overview

The SK040NTP is a 1 kV, 40 A standard recovery SCR manufactured by Littelfuse Inc., housed in a Surface Mount TO-263 (D2PAK) package. This thyristor is designed for applications requiring high current switching at 1 kV blocking voltage with standard recovery characteristics. The part is currently Active in product status with 916 units in stock. Finding equivalent or substitute parts may be necessary due to supply constraints, lead time requirements, or design flexibility needs in production environments.

Substiute Parts

SK040NTP

Littelfuse Inc.In Stock: 950SK040NTP Datasheet

Current PartRFQ

TN1625-1000G-TR

STMicroelectronicsIn Stock: 3192TN1625-1000G-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SK040NTP is evaluated based on the following critical electrical and mechanical parameters:

• Voltage Rating: Off-state voltage must be 1 kV or higher to maintain blocking capability
• Current Rating: On-state RMS current (It (RMS)) and average current (It (AV)) must meet or exceed application requirements
• Gate Trigger Parameters: Vgt and Igt must be compatible with existing gate drive circuitry
• On-State Voltage Drop: Vtm affects power dissipation and thermal performance
• Package Compatibility: Surface Mount D2PAK (TO-263) package ensures mechanical and thermal interface compatibility
• SCR Type: Standard Recovery characteristic must be maintained for switching performance
• Operating Temperature: -40°C to 125°C range must be supported
• Compliance: RoHS3 compliance and REACH unaffected status required

The TN1625-1000G-TR from STMicroelectronics meets the voltage and package requirements but operates at a reduced current rating of 16 A RMS, making it suitable only for applications with lower current demands than the SK040NTP's 40 A RMS capability.

Parameter Comparison

Engineering Selection Recommendations

The TN1625-1000G-TR is a valid substitute for the SK040NTP only in applications where the maximum on-state current requirement does not exceed 16 A RMS. Both devices share identical voltage ratings (1 kV), package form factor (D2PAK), operating temperature range (-40°C to 125°C), and compliance certifications (ROHS3 Compliant, REACH Unaffected). The TN1625-1000G-TR exhibits lower gate trigger voltage and current requirements, which may simplify gate drive circuit design. However, the reduced current capacity (16 A RMS versus 40 A RMS) represents a significant limitation for higher-power applications. Selection between these parts must be based on the actual current demands of the target application.

Frequently Asked Questions (FAQ)

Q: Can the TN1625-1000G-TR replace the SK040NTP in all applications?

A: No. The TN1625-1000G-TR has a maximum on-state RMS current rating of 16 A, compared to the SK040NTP's 40 A. Substitution is only valid for applications requiring 16 A RMS or less.

Q: Are the packages physically compatible?

A: Yes. Both devices use the Surface Mount TO-263-3 D2PAK package with identical pinout and thermal interface characteristics, allowing direct PCB layout compatibility.

Q: What are the gate drive differences between these parts?

A: The TN1625-1000G-TR requires lower gate trigger voltage (1.3 V maximum versus 1.5 V) and lower gate trigger current (25 mA maximum versus 40 mA). Existing gate drive circuits designed for the SK040NTP will operate the TN1625-1000G-TR without modification, though with reduced margin.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the SK040NTP and TN1625-1000G-TR are ROHS3 Compliant and REACH Unaffected, with identical operating temperature ranges of -40°C to 125°C.

Q: What is the primary limitation of using the TN1625-1000G-TR as a substitute?

A: Current capacity. The TN1625-1000G-TR's 16 A RMS rating is 60% lower than the SK040NTP's 40 A RMS rating. Applications requiring the full 40 A capability cannot use this substitute.