STF20NF06 Equivalent & Substitute Parts

Part Overview

The STF20NF06 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 classified as Obsolete. Due to its obsolete status, equivalent substitute parts are necessary for new designs and ongoing production requirements. Substitute devices must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics while accommodating available packaging options.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	60	V
Current - Continuous Drain (Id) @ 25°C	20	A
Rds On (Max) @ Id, Vgs	70	mOhm @ 10A, 10V
Vgs(th) (Max) @ Id	4	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	18	nC @ 10V
Power Dissipation (Max)	28	W
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Full Pack	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STF20NF06 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Electrical Compatibility Requirements:

Drain to Source Voltage (Vdss) must equal or exceed 60V
Continuous Drain Current (Id) must equal or exceed 20A at 25°C
Gate Threshold Voltage (Vgs(th)) must be compatible at 4V maximum
Maximum Gate Supply Voltage (Vgs) must accommodate ±20V operation
Operating temperature range must span -55°C to 175°C

Mechanical Compatibility Requirements:

Mounting type must be Through Hole
Package must be TO-220 series (TO-220FP, TO-220AB, or TO-220-3)
Pin configuration must support direct PCB substitution

Regulatory Compliance:

RoHS3 compliance required
REACH Unaffected status required

The substitute parts listed below satisfy these criteria within the allowed parameter tolerances for this product category.

Parameter Comparison

Parameter	STF20NF06 (Main)	IRFIZ24NPBF	IRFIZ34GPBF
Manufacturer	STMicroelectronics	Infineon Technologies	Vishay Siliconix
FET Type	N-Channel	N-Channel	N-Channel
Drain to Source Voltage (Vdss)	60V	55V	60V
Current - Continuous Drain (Id) @ 25°C	20A	14A	20A
Rds On (Max) @ Id, Vgs	70 mOhm @ 10A, 10V	70 mOhm @ 7.8A, 10V	50 mOhm @ 12A, 10V
Vgs(th) (Max) @ Id	4V @ 250µA	4V @ 250µA	4V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	18 nC @ 10V	20 nC @ 10V	46 nC @ 10V
Vgs (Max)	±20V	±20V	±20V
Input Capacitance (Ciss) (Max) @ Vds	400 pF @ 25V	370 pF @ 25V	1200 pF @ 25V
Power Dissipation (Max)	28W	29W	42W
Operating Temperature Range	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3 Full Pack	TO-220-3 Full Pack	TO-220-3 Full Pack, Isolated Tab
Product Status	Obsolete	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

IRFIZ34GPBF (Preferred Substitute)

The IRFIZ34GPBF is the primary recommended substitute for the STF20NF06. This device matches the critical electrical specifications: 60V Vdss rating, 20A continuous drain current, and identical gate threshold voltage. The IRFIZ34GPBF is classified as Active product status, ensuring long-term availability and supply chain stability. It maintains full RoHS3 compliance and REACH Unaffected status. The device features improved on-resistance performance (50 mOhm versus 70 mOhm) and higher power dissipation capability (42W versus 28W), providing enhanced thermal margin in applications. The TO-220-3 package with isolated tab is mechanically compatible with standard TO-220 PCB layouts. Higher gate charge (46 nC) and input capacitance (1200 pF) require gate driver circuit verification in high-frequency switching applications.

IRFIZ24NPBF (Secondary Substitute)

The IRFIZ24NPBF is a secondary substitute option with limitations. While it maintains N-Channel topology, gate threshold voltage compatibility, and identical on-resistance specification, it is rated for only 55V Vdss and 14A continuous drain current. This device is classified as Not For New Designs, indicating limited future availability. The IRFIZ24NPBF is suitable only for applications where the reduced voltage and current ratings do not exceed design requirements. RoHS3 compliance and REACH Unaffected status are maintained. This substitute is not recommended for new designs or applications requiring the full 60V/20A capability of the original STF20NF06.

Frequently Asked Questions (FAQ)

Q: Can the IRFIZ34GPBF directly replace the STF20NF06 on existing PCBs?

A: Yes. Both devices use the TO-220-3 package with identical pin configuration and Through Hole mounting. The IRFIZ34GPBF features an isolated tab variant, which is compatible with standard TO-220 PCB layouts. No PCB modifications are required for mechanical substitution.

Q: What is the significance of the IRFIZ34GPBF having higher gate charge (46 nC) compared to the STF20NF06 (18 nC)?

A: Higher gate charge increases the energy required to switch the device on and off. Gate driver circuits must supply sufficient current to charge the gate within the required switching time. Applications with tight switching frequency requirements or low-power gate drivers may require circuit analysis to confirm compatibility.

Q: Why is the IRFIZ24NPBF listed as a substitute if it has lower current rating (14A versus 20A)?

A: The IRFIZ24NPBF is listed as a substitute for applications where the design does not require the full 20A continuous drain current capability. It maintains electrical compatibility in lower-current applications. However, it is not suitable for designs requiring 20A operation.

Q: Are there thermal considerations when substituting the STF20NF06 with the IRFIZ34GPBF?

A: The IRFIZ34GPBF has higher maximum power dissipation (42W versus 28W) and lower on-resistance (50 mOhm versus 70 mOhm). These characteristics generally reduce junction temperature in equivalent operating conditions. Thermal design margins improve with the IRFIZ34GPBF substitute.

Q: What is the impact of the IRFIZ34GPBF having higher input capacitance (1200 pF versus 400 pF)?

A: Higher input capacitance increases the capacitive load on the gate driver circuit. This affects gate driver current requirements and switching speed. High-frequency switching applications must verify that gate driver circuits can supply sufficient current to achieve the required switching transitions within design specifications.

Q: Are both substitute parts compliant with current environmental regulations?

A: Yes. Both IRFIZ24NPBF and IRFIZ34GPBF are ROHS3 Compliant and REACH Unaffected, matching the regulatory status of the STF20NF06.

Q: What is the difference between the TO-220AB and TO-220-3 packages used by the substitutes?

A: Both are TO-220 series packages with identical pin configuration and Through Hole mounting. The TO-220AB (used by IRFIZ24NPBF) and TO-220-3 (used by IRFIZ34GPBF) are mechanically interchangeable on standard PCBs. The isolated tab variant of the TO-220-3 provides electrical isolation of the tab from the drain connection in some applications.

Q: Why is the STF20NF06 classified as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production and support. Substitute parts are necessary to maintain design continuity and ensure long-term component availability for production and field service applications.

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