STF20NF06L N-Channel MOSFET 60V 20A Equivalent & Substitute Parts

Part Overview

The STF20NF06L is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 60V drain-to-source voltage and 20A continuous drain current in a Through Hole TO-220FP package. This device is part of the STripFET™ II series and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure ongoing component availability for new production and field replacements.

Substiute Parts

STF20NF06L

STMicroelectronicsIn Stock: 1335STF20NF06L Datasheet

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IRLIZ24G

Vishay SiliconixIn Stock: 5396IRLIZ24G Datasheet

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IRLIZ34GPBF

Vishay SiliconixIn Stock: 1880IRLIZ34GPBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STF20NF06L is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain to Source Voltage (Vdss): Must equal or exceed 60V
• Current - Continuous Drain (Id): Must equal or exceed 20A at 25°C
• Mounting Type: Must be Through Hole
• Package / Case: Must be TO-220-3 compatible

Secondary Compatibility Parameters:

• Operating Temperature Range: Must encompass -55°C to 175°C
• Gate Charge (Qg): Lower values indicate faster switching performance
• Rds On (Max): Lower on-resistance indicates improved efficiency
• Vgs(th): Threshold voltage must be compatible with drive circuitry

Substitute parts are grouped based on their ability to meet or exceed the primary criteria while maintaining electrical performance within acceptable ranges for the application.

Parameter Comparison

Engineering Selection Recommendations

IRLIZ34GPBF (Primary Substitute)

The IRLIZ34GPBF from Vishay Siliconix is the direct functional equivalent to the STF20NF06L. Both devices share identical voltage and current ratings (60V, 20A), matching package configuration (TO-220-3), and identical operating temperature range (-55°C to 175°C). The IRLIZ34GPBF is currently in active production status, ensuring long-term availability. This device is ROHS3 compliant, matching the compliance status of the original part. The IRLIZ34GPBF demonstrates superior on-resistance performance (50 mOhm vs. 70 mOhm), resulting in lower power dissipation and improved thermal efficiency in equivalent applications.

IRLIZ24G (Partial Substitute)

The IRLIZ24G is a reduced-current alternative rated for 14A continuous drain current, compared to the 20A rating of the STF20NF06L. This device is suitable only for applications where the maximum current requirement does not exceed 14A. The IRLIZ24G shares the same 60V voltage rating, Through Hole mounting type, and operating temperature range. However, this device is not ROHS3 compliant, which may restrict its use in applications with RoHS compliance requirements. The IRLIZ24G is currently in active production status.

Frequently Asked Questions (FAQ)

Q: Can the IRLIZ34GPBF directly replace the STF20NF06L without circuit modifications?

A: Yes. The IRLIZ34GPBF meets all primary substitution criteria: identical Vdss (60V), identical Id (20A), compatible TO-220-3 package, and matching operating temperature range (-55°C to 175°C). The device can be used as a direct pin-for-pin replacement. The improved on-resistance (50 mOhm vs. 70 mOhm) provides enhanced performance characteristics.

Q: Is the IRLIZ24G suitable as a substitute for the STF20NF06L?

A: The IRLIZ24G is suitable only for applications where continuous drain current does not exceed 14A. The STF20NF06L is rated for 20A continuous drain current. Using the IRLIZ24G in applications requiring the full 20A rating will result in device overstress and potential failure. Verify application current requirements before selecting this substitute.

Q: What are the package differences between the substitute parts?

A: Both substitute parts use the TO-220-3 package, which is mechanically compatible with the STF20NF06L. The IRLIZ24G and IRLIZ34GPBF feature an isolated tab configuration, which is standard for Vishay Siliconix TO-220-3 devices. This configuration is compatible with standard TO-220-3 mounting hardware and thermal management solutions.

Q: Does the IRLIZ24G meet RoHS compliance requirements?

A: No. The IRLIZ24G is not ROHS3 compliant. If your application or supply chain requires RoHS compliance, the IRLIZ34GPBF is the appropriate substitute, as it is ROHS3 compliant, matching the compliance status of the original STF20NF06L.

Q: How do the gate charge characteristics affect substitution?

A: The STF20NF06L has a gate charge of 7.5 nC at 10V, while the IRLIZ34GPBF has 35 nC at 5V. Higher gate charge requires more drive current from the gate driver circuit. If the existing gate driver is current-limited, the higher gate charge of the IRLIZ34GPBF may result in slower switching transitions. Verify that the gate driver circuit can supply sufficient current for the substitute device's gate charge specification.

Q: What is the significance of the lower Vgs(th) in the substitute parts?

A: The STF20NF06L has a Vgs(th) of 4V, while both substitute parts have 2V. A lower threshold voltage means the device begins to conduct at a lower gate-source voltage. This can affect gate driver design and switching behavior. Ensure that the gate driver circuit is compatible with the lower threshold voltage of the substitute device.

Q: Are there thermal management differences between the main part and substitutes?

A: The IRLIZ34GPBF has a maximum power dissipation rating of 42W compared to 28W for the STF20NF06L. The IRLIZ24G is rated for 37W. Higher power dissipation ratings indicate improved thermal performance. In applications operating near the thermal limits of the original device, the substitute parts may offer improved thermal margin.