STGP18N40LZ IGBT Equivalent & Substitute Parts

Part Overview

The STGP18N40LZ is a 420V, 30A IGBT manufactured by STMicroelectronics in the PowerMESH™ series, housed in a TO-220-3 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The 150W power rating and logic-level gate drive make this device suitable for industrial switching applications requiring moderate current handling at elevated voltages.

Substiute Parts

STGP18N40LZ

STMicroelectronicsIn Stock: 2762STGP18N40LZ Datasheet

Current PartRFQ

ISL9V3040P3

onsemiIn Stock: 23098ISL9V3040P3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STGP18N40LZ is determined by the following critical parameters:

Voltage Rating: The substitute must maintain a collector-emitter breakdown voltage of 420V or higher to ensure safe operation within the original design envelope.

Current Rating: The substitute must support a continuous collector current (Ic) of at least 30A to handle the specified load without thermal stress.

Power Dissipation: The substitute must be rated for 150W maximum power to ensure thermal compatibility with existing heat management designs.

Package Type: The substitute must use the TO-220-3 through-hole package to maintain mechanical and thermal interface compatibility with printed circuit board layouts.

Gate Drive Compatibility: The substitute must feature logic-level gate drive input to ensure compatibility with existing gate driver circuits.

Compliance Standards: The substitute must maintain ROHS3 compliance and EAR99 export classification to satisfy regulatory and supply chain requirements.

The ISL9V3040P3 from onsemi meets these substitution criteria within the allowed parameter tolerances for this product category.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The STGP18N40LZ is classified as obsolete, making the ISL9V3040P3 the appropriate active alternative. The substitute is in current production with established supply chain availability (23,020 pieces in stock versus 2,660 for the main part).

Compliance Alignment: Both components maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory continuity in design transitions.

Current Rating Variance: The ISL9V3040P3 is rated for 21A continuous collector current, which is 9A lower than the STGP18N40LZ specification of 30A. Applications operating at or near the 30A maximum rating require thermal and circuit analysis to confirm the substitute's suitability.

Switching Characteristics: The substitute exhibits faster switching performance, with turn-off time of 4.8µs compared to 13.5µs for the main part, and lower gate charge (17nC versus 29nC). These characteristics reduce switching losses and may improve overall system efficiency.

Temperature Range: The substitute operates from -40°C to 175°C, compared to -55°C to 175°C for the main part. Applications requiring operation below -40°C junction temperature require alternative solutions.

Packaging and Thermal Interface: Both components use identical TO-220-3 through-hole packaging, ensuring direct mechanical and thermal compatibility with existing printed circuit board designs and heat sink interfaces.

Frequently Asked Questions (FAQ)

Q: Can the ISL9V3040P3 directly replace the STGP18N40LZ in all applications?

A: Direct replacement is possible for applications where the collector current does not exceed 21A continuous operation. Applications designed for the full 30A rating of the STGP18N40LZ require circuit analysis and thermal verification before substitution.

Q: What is the significance of the lower gate charge in the ISL9V3040P3?

A: The 17nC gate charge of the ISL9V3040P3 compared to 29nC for the STGP18N40LZ results in reduced gate drive power requirements and faster switching transitions. Existing gate driver circuits designed for the higher gate charge will operate with reduced drive current demand.

Q: Are there thermal management differences between these components?

A: Both components are rated for 150W maximum power dissipation and use identical TO-220-3 packaging. Thermal performance depends on application-specific current levels, switching frequency, and heat sink design rather than inherent component differences.

Q: Does the operating temperature range difference affect substitution?

A: The ISL9V3040P3 minimum operating temperature of -40°C (versus -55°C for the STGP18N40LZ) is acceptable for most industrial applications. Applications requiring operation below -40°C junction temperature must retain the original part or identify alternative solutions.

Q: How do the voltage ratings compare?

A: The ISL9V3040P3 is rated for 430V breakdown voltage, which is 10V higher than the STGP18N40LZ at 420V. This higher rating provides additional safety margin and is fully compatible with circuits designed for 420V operation.

Q: What packaging considerations apply to this substitution?

A: Both components use TO-220-3 through-hole packaging with identical pin configuration and thermal interface. No modifications to printed circuit board layouts, mounting hardware, or heat sink interfaces are required.

Q: Is the faster turn-off time of the ISL9V3040P3 a concern?

A: The 4.8µs turn-off time of the ISL9V3040P3 compared to 13.5µs for the STGP18N40LZ represents improved switching performance. Existing circuits will benefit from reduced switching losses; no circuit modifications are necessary to accommodate faster switching.