STP270N4F3 N-Channel 40V 120A MOSFET Equivalent & Substitute Parts

Part Overview

The STP270N4F3 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 40V drain-to-source voltage and 120A continuous drain current at 25°C. This device is packaged in TO-220-3 and belongs to the STripFET™ III series. The part is classified as Obsolete, making equivalent and substitute components necessary for ongoing design support and procurement.

The STP270N4F3 is suitable for high-current switching applications requiring low on-resistance and thermal performance up to 330W at the junction temperature. Substitution is required due to product discontinuation and the need for active or alternative product status components.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	120	A (Tc)
On-Resistance (Rds On) @ 80A, 10V	2.9	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	150	nC
Power Dissipation (Max)	330	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-220-3	Through Hole
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitution of the STP270N4F3 is determined by the following critical parameters:

Primary Matching Criteria:

Drain-to-Source Voltage (Vdss): 40V (exact match required)
Package Type: TO-220-3 (mechanical and thermal compatibility)
FET Type: N-Channel (functional requirement)
Technology: MOSFET (Metal Oxide) (functional requirement)
Operating Temperature Range: -55°C to 175°C (thermal envelope)

Secondary Performance Criteria:

Continuous Drain Current (Id) @ 25°C: 120A or greater
On-Resistance (Rds On): 2.9mOhm or lower (performance equivalence)
Gate Threshold Voltage (Vgs(th)): 4V (gate drive compatibility)
Power Dissipation: 330W or greater (thermal capability)

Substitute parts are grouped into two categories:

Category A – Direct Equivalents (120A or higher current rating): Parts meeting or exceeding the 120A continuous drain current specification with comparable on-resistance and power dissipation characteristics.

Category B – Functional Alternatives (80A to 105A current rating): Parts with reduced current ratings but maintaining voltage, package, and thermal compatibility for applications with lower current demands.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Power Diss. (W)	Package	Status
STP270N4F3	STMicroelectronics	40	120 (Tc)	2.9 @ 80A, 10V	4 @ 250µA	150 @ 10V	330 (Tc)	TO-220-3	Obsolete
IPP015N04NGXKSA1	Infineon Technologies	40	120 (Tc)	1.5 @ 100A, 10V	4 @ 200µA	250 @ 10V	250 (Tc)	TO-220-3	Active
IRF2204PBF	Infineon Technologies	40	210 (Tc)	3.6 @ 130A, 10V	4 @ 250µA	200 @ 10V	330 (Tc)	TO-220-3	Active
IRF1404ZPBF	Infineon Technologies	40	180 (Tc)	3.7 @ 75A, 10V	4 @ 250µA	150 @ 10V	200 (Tc)	TO-220-3	Active
IRF1404PBF	Infineon Technologies	40	202 (Tc)	4.0 @ 121A, 10V	4 @ 250µA	196 @ 10V	333 (Tc)	TO-220-3	Not For New Designs
IRF2804PBF	Infineon Technologies	40	75 (Tc)	2.3 @ 75A, 10V	4 @ 250µA	240 @ 10V	300 (Tc)	TO-220-3	Active
FDP8441	Fairchild Semiconductor	40	80 (Tc)	2.7 @ 80A, 10V	4 @ 250µA	280 @ 10V	300 (Tc)	TO-220-3	Active
AOT240L	Alpha & Omega Semiconductor Inc.	40	105 (Tc)	2.9 @ 20A, 10V	2.2 @ 250µA	72 @ 10V	176 (Tc)	TO-220-3	Not For New Designs
IPP023N04NGXKSA1	Infineon Technologies	40	90 (Tc)	2.3 @ 90A, 10V	4 @ 95µA	120 @ 10V	167 (Tc)	TO-220-3	Active
IPP041N04NGXKSA1	Infineon Technologies	40	80 (Tc)	4.1 @ 80A, 10V	4 @ 45µA	56 @ 10V	94 (Tc)	TO-220-3	Active
IPP039N04LGXKSA1	Infineon Technologies	40	80 (Tc)	3.9 @ 80A, 10V	2 @ 45µA	78 @ 10V	94 (Tc)	TO-220-3	Not For New Designs

Engineering Selection Recommendations

For Direct Replacement (120A+ Current Requirement):

The IPP015N04NGXKSA1 (Infineon Technologies, Active status) is the primary direct equivalent. This part maintains the 40V Vdss rating, matches the 120A continuous drain current specification, and is housed in TO-220-3 package. The IPP015N04NGXKSA1 features superior on-resistance (1.5mOhm versus 2.9mOhm), providing improved thermal performance. This part is in Active product status and carries ROHS3 compliance and REACH Unaffected designation, suitable for new designs.

The IRF2204PBF (Infineon Technologies, Active status) provides an alternative with higher current capability (210A) and identical power dissipation (330W). This part is suitable for applications requiring margin above the 120A specification. It maintains 40V Vdss, TO-220-3 package, and 4V gate threshold voltage.

For Reduced Current Applications (80A to 105A):

The FDP8441 (Fairchild Semiconductor, Active status) is suitable for applications with 80A continuous drain current requirements. This part maintains 40V Vdss, TO-220-3 package, and 4V gate threshold voltage with 2.7mOhm on-resistance. Power dissipation is rated at 300W.

The IPP023N04NGXKSA1 (Infineon Technologies, Active status) provides 90A continuous drain current with 2.3mOhm on-resistance and is suitable for moderate current applications. This part is in Active status with ROHS3 compliance.

Compliance and Status Considerations:

All recommended substitute parts carry ROHS3 compliance and REACH Unaffected designation. Parts in Active product status (IPP015N04NGXKSA1, IRF2204PBF, IRF2804PBF, FDP8441, IPP023N04NGXKSA1, IPP041N04NGXKSA1) are preferred for new designs. Parts marked "Not For New Designs" (IRF1404PBF, AOT240L, IPP039N04LGXKSA1) are suitable for legacy system support and maintenance applications only.

Frequently Asked Questions (FAQ)

Q: Can the IPP015N04NGXKSA1 directly replace the STP270N4F3 in existing designs?

A: Yes. Both parts share identical 40V Vdss rating, 120A continuous drain current specification, TO-220-3 package, and -55°C to 175°C operating temperature range. The IPP015N04NGXKSA1 features lower on-resistance (1.5mOhm versus 2.9mOhm), which improves thermal performance. Gate threshold voltage is 4V for both parts, ensuring compatible gate drive requirements. Pin configuration is identical in TO-220-3 package.

Q: What is the difference between parts rated at 120A versus 80A continuous drain current?

A: The continuous drain current rating defines the maximum sustained current the device can conduct at 25°C junction temperature without exceeding thermal limits. A 120A-rated part (such as STP270N4F3 or IPP015N04NGXKSA1) can safely conduct 120A continuously. An 80A-rated part (such as FDP8441 or IPP041N04NGXKSA1) is limited to 80A continuous operation. Selection depends on application current requirements. Using an 80A part in a 120A application will result in thermal stress and potential device failure.

Q: Why does the IRF2204PBF have higher current rating (210A) but lower power dissipation (330W) than some alternatives?

A: Power dissipation is determined by on-resistance and current: P = I²R. The IRF2204PBF has 3.6mOhm on-resistance at 130A, while the STP270N4F3 has 2.9mOhm at 80A. At the IRF2204PBF's rated 210A, the higher current is partially offset by slightly higher on-resistance, resulting in comparable power dissipation. The 330W rating indicates the device can dissipate this power within thermal limits when properly mounted.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant designation. The original STP270N4F3 also carries ROHS3 compliance. All parts are REACH Unaffected, indicating no restricted substances of concern.

Q: What is the significance of "Active" versus "Not For New Designs" product status?

A: Active status indicates the manufacturer continues production and supports the part for new designs. "Not For New Designs" status indicates the manufacturer has discontinued active support but may continue limited production for legacy applications. For new designs, select parts with Active status. For maintenance and legacy system support, "Not For New Designs" parts remain available but should not be used in new product development.

Q: Can I use a part with lower on-resistance as a direct substitute?

A: Yes. Lower on-resistance is a performance improvement. A part with 1.5mOhm on-resistance (IPP015N04NGXKSA1) can replace a 2.9mOhm part (STP270N4F3) in the same application. Lower on-resistance reduces heat generation and improves efficiency. Verify that gate drive voltage and threshold voltage are compatible with your circuit design.

Q: What is the importance of gate charge (Qg) in substitution?

A: Gate charge affects switching speed and gate drive circuit requirements. The STP270N4F3 has 150nC gate charge at 10V. Substitute parts range from 56nC to 280nC. Lower gate charge enables faster switching and reduces gate drive power consumption. Higher gate charge requires more gate drive current but may provide improved noise immunity. Select based on your gate drive circuit capability and switching frequency requirements.

Q: Are TO-220-3 and TO-220AB packages interchangeable?

A: TO-220-3 and TO-220AB are mechanically and electrically compatible packages. Both are three-terminal through-hole packages with identical pin spacing and thermal characteristics. Parts specified as TO-220AB (such as IRF1404PBF and IRF2204PBF) can be mounted in TO-220-3 footprints without modification.

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