IRFL024N N-Channel MOSFET 55V 2.8A SOT-223 Equivalent & Substitute Parts

Part Overview

The IRFL024N is an N-Channel MOSFET manufactured by Infineon Technologies, designed for surface mount applications in the SOT-223 package. This device operates at 55V drain-to-source voltage with a continuous drain current rating of 2.8A at 25°C and a maximum power dissipation of 1W. The IRFL024N is part of the HEXFET® series and is currently classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts with compatible electrical and mechanical specifications are necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	2.8	A (Ta)
On-Resistance (Rds On) @ Id, Vgs	75	mOhm @ 2.8A, 10V
Gate Threshold Voltage (Vgs(th)) @ Id	4	V @ 250µA
Gate Charge (Qg) @ Vgs	18.3	nC @ 10V
Maximum Gate Voltage (Vgs)	±20	V
Input Capacitance (Ciss) @ Vds	400	pF @ 25V
Power Dissipation (Max)	1	W (Ta)
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	SOT-223	Surface Mount
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)

Substitute Part Grouping Explanation

Substitute parts for the IRFL024N are selected based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Primary Compatibility Criteria:

FET Type: N-Channel (required match)
Technology: MOSFET (Metal Oxide) (required match)
Drain-to-Source Voltage (Vdss): 55V or higher (equal or greater)
Package Type: SOT-223 surface mount (required match)
Operating Temperature Range: -55°C to 150°C (required match)

Secondary Electrical Parameters:

Continuous Drain Current (Id): Equal to or greater than 2.8A
On-Resistance (Rds On): Equal to or lower than 75mOhm at rated conditions
Gate Threshold Voltage (Vgs(th)): Within ±20V maximum gate voltage specification
Input Capacitance (Ciss): Acceptable for circuit switching characteristics

All substitute parts listed meet or exceed the IRFL024N electrical specifications while maintaining identical package and mounting characteristics. Substitutes are grouped by manufacturer and product series.

Parameter Comparison

Parameter	IRFL024N (Infineon)	BUK7880-55A/CUX (Nexperia)	BUK9880-55A/CUX (Nexperia)	STN3NF06 (STMicroelectronics)	STN3NF06L (STMicroelectronics)
Manufacturer	Infineon Technologies	Nexperia USA Inc.	Nexperia USA Inc.	STMicroelectronics	STMicroelectronics
FET Type	N-Channel	N-Channel	N-Channel	N-Channel	N-Channel
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)
Vdss	55V	55V	55V	60V	60V
Continuous Drain Current (Id) @ 25°C	2.8A (Ta)	7A (Tc)	7A (Tc)	4A (Tc)	4A (Tc)
Rds On (Max)	75mOhm @ 2.8A, 10V	80mOhm @ 10A, 10V	73mOhm @ 8A, 10V	100mOhm @ 1.5A, 10V	100mOhm @ 1.5A, 10V
Vgs(th) (Max) @ Id	4V @ 250µA	4V @ 1mA	2V @ 1mA	4V @ 250µA	2.8V @ 250µA
Gate Charge (Qg) @ Vgs	18.3nC @ 10V	12nC @ 10V	11nC @ 5V	13nC @ 10V	9nC @ 5V
Vgs (Max)	±20V	±20V	±15V	±20V	±16V
Input Capacitance (Ciss) @ Vds	400pF @ 25V	500pF @ 25V	584pF @ 25V	315pF @ 25V	340pF @ 25V
Power Dissipation (Max)	1W (Ta)	8W (Tc)	8W (Tc)	3.3W (Tc)	3.3W (Tc)
Operating Temperature	-55°C to 150°C (TJ)	-55°C to 150°C (TJ)	-55°C to 150°C (TJ)	-55°C to 150°C (TJ)	-55°C to 150°C (TJ)
Package / Case	TO-261-4, TO-261AA (SOT-223)	TO-261-4, TO-261AA (SOT-223)	TO-261-4, TO-261AA (SOT-223)	TO-261-4, TO-261AA (SOT-223)	TO-261-4, TO-261AA (SOT-223)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS Non-Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q100 Qualification	Not specified	Yes	Yes	Not specified	Not specified

Engineering Selection Recommendations

BUK7880-55A/CUX (Nexperia USA Inc.)

This substitute provides direct voltage and package compatibility with the IRFL024N while offering superior electrical performance. The BUK7880-55A/CUX delivers 7A continuous drain current compared to the IRFL024N's 2.8A, with comparable on-resistance characteristics. The device is active in production, RoHS3 compliant, and carries AEC-Q100 automotive qualification. The TrenchMOS™ technology platform ensures reliable long-term availability. This part is suitable for applications requiring enhanced current handling capacity within the same thermal envelope.

BUK9880-55A/CUX (Nexperia USA Inc.)

This substitute offers the highest inventory availability (248,200 pieces) and lowest on-resistance specification (73mOhm @ 8A, 10V) among all listed alternatives. The BUK9880-55A/CUX maintains 55V Vdss rating and SOT-223 packaging identical to the IRFL024N. The device is active, RoHS3 compliant, and AEC-Q100 qualified. Lower gate charge (11nC @ 5V) provides improved switching efficiency. The reduced maximum gate voltage specification (±15V versus ±20V) requires verification against circuit gate drive requirements.

STN3NF06 (STMicroelectronics)

This substitute provides 60V Vdss rating, exceeding the IRFL024N's 55V specification, with 4A continuous drain current. The STN3NF06 operates within identical temperature range and SOT-223 package. The STripFET™ II technology platform is active in production and RoHS3 compliant. Input capacitance is lower (315pF @ 25V) than the IRFL024N, potentially reducing switching losses. Gate threshold voltage matches the IRFL024N specification (4V @ 250µA). This part is appropriate for applications where higher voltage margin is beneficial.

STN3NF06L (STMicroelectronics)

This variant of the STN3NF06 series offers the lowest gate charge specification (9nC @ 5V) and reduced gate threshold voltage (2.8V @ 250µA), enabling faster switching response. The 60V Vdss rating provides voltage margin above the IRFL024N's 55V specification. The device is active, RoHS3 compliant, and maintains SOT-223 packaging. Maximum gate voltage is ±16V, requiring circuit verification. Highest inventory availability among STMicroelectronics options (72,446 pieces) supports production continuity.

Selection Criteria Summary:

For maximum current capacity and proven automotive qualification: BUK7880-55A/CUX or BUK9880-55A/CUX
For voltage margin and lower switching losses: STN3NF06 or STN3NF06L
For highest inventory availability: BUK9880-55A/CUX
For RoHS3 compliance requirement: All listed substitutes meet this requirement
For applications requiring AEC-Q100 qualification: BUK7880-55A/CUX or BUK9880-55A/CUX

Frequently Asked Questions (FAQ)

Q: Can the BUK7880-55A/CUX or BUK9880-55A/CUX be used as direct replacements for the IRFL024N in existing designs?

A: Yes. Both Nexperia devices maintain identical 55V Vdss rating, SOT-223 package configuration, and operating temperature range. The higher current ratings (7A versus 2.8A) and improved on-resistance characteristics provide enhanced performance margins. Pin-to-pin compatibility is maintained within the SOT-223 package. Circuit gate drive voltage requirements must be verified against the specified maximum gate voltage (±20V for BUK7880-55A/CUX, ±15V for BUK9880-55A/CUX).

Q: What is the difference between STN3NF06 and STN3NF06L?

A: Both devices share identical 60V Vdss rating, 4A continuous drain current, and SOT-223 packaging. The STN3NF06L variant features lower gate threshold voltage (2.8V @ 250µA versus 4V @ 250µA), reduced gate charge (9nC @ 5V versus 13nC @ 10V), and lower maximum gate voltage specification (±16V versus ±20V). The STN3NF06L provides faster switching response due to lower gate charge. Circuit gate drive voltage must be verified for compatibility with the ±16V maximum specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All four substitute parts (BUK7880-55A/CUX, BUK9880-55A/CUX, STN3NF06, and STN3NF06L) are RoHS3 compliant. The original IRFL024N is RoHS non-compliant. Substitution with any listed part satisfies RoHS3 compliance requirements.

Q: Which substitute part has the lowest on-resistance?

A: The BUK9880-55A/CUX offers the lowest on-resistance specification at 73mOhm @ 8A, 10V. This represents a 2.7% improvement over the IRFL024N's 75mOhm @ 2.8A, 10V specification, reducing power dissipation in switching applications.

Q: Do the substitute parts require different PCB footprints?

A: No. All substitute parts maintain the SOT-223 package designation (TO-261-4, TO-261AA case outline). PCB footprints are identical. No layout modifications are required for substitution.

Q: Which substitute part is recommended for automotive applications?

A: Both BUK7880-55A/CUX and BUK9880-55A/CUX carry AEC-Q100 qualification, meeting automotive industry reliability standards. Either part is suitable for automotive applications. The BUK9880-55A/CUX offers superior availability and lower on-resistance.

Q: What is the inventory status of each substitute part?

A: BUK9880-55A/CUX: 248,200 pieces (highest availability); STN3NF06L: 72,446 pieces; BUK7880-55A/CUX: 35,094 pieces; STN3NF06: 7,792 pieces. The BUK9880-55A/CUX provides the most reliable long-term supply continuity.

Q: Can the STN3NF06 or STN3NF06L be used in circuits designed for 55V operation?

A: Yes. Both STMicroelectronics devices are rated for 60V Vdss, providing 5V margin above the IRFL024N's 55V specification. This higher voltage rating ensures safe operation in 55V circuits with additional reliability margin.

Q: What is the primary reason for substituting the IRFL024N?

A: The IRFL024N is classified as obsolete. Substitute parts are necessary to ensure design continuity, production support, and long-term component availability. All listed substitutes are active products with established supply chains and RoHS3 compliance.

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