IRFL024NTR N-Channel MOSFET 55V 2.8A SOT-223 Equivalent & Substitute Parts

Part Overview

The IRFL024NTR 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 maximum power dissipation of 1W. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating the SOT-223 package form factor.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	2.8	A (Ta)
On-State Resistance (Rds On) @ Id, Vgs	75	mOhm @ 2.8A, 10V
Gate-Source Threshold Voltage (Vgs(th)) @ Id	4	V @ 250µA
Gate Charge (Qg) @ Vgs	18.3	nC @ 10V
Maximum Gate-Source Voltage (Vgs Max)	±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
Series	HEXFET®	-

Substitute Part Grouping Explanation

Substitution of the IRFL024NTR is determined by strict adherence to the following electrical and mechanical criteria:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 55V
Package Type: Must be SOT-223 (TO-261-4, TO-261AA)
Mounting Type: Surface Mount
Operating Temperature Range: Must encompass -55°C to 150°C (TJ)
FET Type: N-Channel MOSFET (Metal Oxide)

Secondary Compatibility Parameters:

Continuous Drain Current (Id): Minimum 2.8A at rated temperature
On-State Resistance (Rds On): Must not exceed application thermal limits
Gate-Source Threshold Voltage (Vgs(th)): Must be compatible with drive circuitry
Maximum Gate-Source Voltage (Vgs Max): Must accommodate ±20V or greater

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (enhanced performance characteristics within compatible voltage and package constraints).

Parameter Comparison

Parameter	IRFL024NTR	IRFL024NTRPBF	BUK7880-55A/CUX	BUK9880-55A/CUX	STN3NF06	STN3NF06L
Manufacturer	Infineon	Infineon	Nexperia	Nexperia	STMicroelectronics	STMicroelectronics
Vdss (V)	55	55	55	55	60	60
Id @ 25°C (A)	2.8 (Ta)	2.8 (Ta)	7 (Tc)	7 (Tc)	4 (Tc)	4 (Tc)
Rds On (mOhm)	75 @ 2.8A, 10V	75 @ 2.8A, 10V	80 @ 10A, 10V	73 @ 8A, 10V	100 @ 1.5A, 10V	100 @ 1.5A, 10V
Vgs(th) (V)	4 @ 250µA	4 @ 250µA	4 @ 1mA	2 @ 1mA	4 @ 250µA	2.8 @ 250µA
Qg (nC)	18.3 @ 10V	18.3 @ 10V	12 @ 10V	11 @ 5V	13 @ 10V	9 @ 5V
Vgs Max (V)	±20	±20	±20	±15	±20	±16
Ciss (pF)	400 @ 25V	400 @ 25V	500 @ 25V	584 @ 25V	315 @ 25V	340 @ 25V
Power Dissipation (W)	1 (Ta)	1 (Ta)	8 (Tc)	8 (Tc)	3.3 (Tc)	3.3 (Tc)
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	SOT-223	SOT-223	SOT-223	SOT-223	SOT-223	SOT-223
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q100	-	-	Yes	Yes	-	-

Engineering Selection Recommendations

IRFL024NTRPBF (Infineon Technologies)

IRFL024NTRPBF is the direct parametric equivalent to IRFL024NTR, maintaining identical electrical specifications across all critical parameters: 55V Vdss, 2.8A continuous drain current, 75mOhm Rds On, and 1W power dissipation. The primary distinction is product status: IRFL024NTRPBF is active and available in high inventory (22,300 pcs), whereas IRFL024NTR is obsolete. IRFL024NTRPBF is RoHS3 compliant and suitable for direct replacement in existing designs without circuit modification. Packaging differs (Cut Tape & Digi-Reel® versus Tape & Reel), but both use SOT-223 surface mount configuration.

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

BUK9880-55A/CUX is a manufacturer-recommended substitute offering enhanced performance within the 55V voltage class. This device maintains 55V Vdss compatibility and SOT-223 packaging while providing 7A continuous drain current (2.5× the IRFL024NTR rating) and 8W power dissipation (8× the original). On-state resistance is 73mOhm at 8A and 10V, comparable to the original specification. BUK9880-55A/CUX includes AEC-Q100 automotive qualification and RoHS3 compliance. Gate charge is reduced to 11nC at 5V, improving switching performance. Vgs(th) is 2V at 1mA and Vgs Max is ±15V. This part is suitable for applications requiring higher current capacity or improved thermal performance within the same voltage envelope. Inventory availability is substantial (248,200 pcs).

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

BUK7880-55A/CUX is an alternative 55V substitute with specifications similar to BUK9880-55A/CUX: 7A continuous drain current, 8W power dissipation, and 80mOhm Rds On at 10A and 10V. This device includes AEC-Q100 qualification and RoHS3 compliance. Gate charge is 12nC at 10V. Vgs(th) is 4V at 1mA, matching the original IRFL024NTR threshold voltage. Vgs Max is ±20V, identical to the original. Packaging is Tape & Reel (TR), matching the original IRFL024NTR format. This part is suitable for designs requiring higher current capacity while maintaining the original gate threshold voltage specification.

STN3NF06 and STN3NF06L (STMicroelectronics)

STN3NF06 and STN3NF06L are manufacturer-recommended substitutes operating at 60V Vdss, providing 5V additional voltage margin over the original 55V specification. Both devices deliver 4A continuous drain current and 3.3W power dissipation. STN3NF06 features 100mOhm Rds On at 1.5A and 10V, with Vgs(th) of 4V at 250µA and gate charge of 13nC at 10V. STN3NF06L offers improved performance with 100mOhm Rds On at 1.5A and 10V, reduced Vgs(th) of 2.8V at 250µA, and reduced gate charge of 9nC at 5V. Both are RoHS3 compliant and available in high inventory (7,792 and 72,446 pcs respectively). The 60V rating accommodates applications with higher transient voltage stress. STN3NF06L is preferred for designs sensitive to gate drive requirements due to lower threshold voltage and gate charge.

Frequently Asked Questions (FAQ)

Q: Can IRFL024NTRPBF be used as a direct replacement for IRFL024NTR?

A: Yes. IRFL024NTRPBF is electrically identical to IRFL024NTR across all specified parameters: 55V Vdss, 2.8A continuous drain current, 75mOhm Rds On, 4V Vgs(th), and 1W power dissipation. The primary difference is product status (active versus obsolete) and packaging format (Cut Tape & Digi-Reel® versus Tape & Reel). Both use SOT-223 surface mount configuration. No circuit modifications are required.

Q: What is the advantage of using BUK9880-55A/CUX or BUK7880-55A/CUX over IRFL024NTRPBF?

A: BUK9880-55A/CUX and BUK7880-55A/CUX provide higher current capacity (7A versus 2.8A) and greater power dissipation capability (8W versus 1W) while maintaining 55V Vdss compatibility and SOT-223 packaging. These devices are suitable for applications requiring higher current handling or improved thermal performance. Both include AEC-Q100 automotive qualification. Selection depends on application current and thermal requirements.

Q: Why would STN3NF06 or STN3NF06L be selected instead of the Infineon alternatives?

A: STN3NF06 and STN3NF06L operate at 60V Vdss, providing 5V additional voltage margin compared to the original 55V specification. This higher voltage rating accommodates applications with transient overvoltage conditions. STN3NF06L offers reduced gate charge (9nC at 5V) and lower threshold voltage (2.8V at 250µA), improving switching performance and gate drive efficiency. Selection depends on voltage margin requirements and gate drive circuit constraints.

Q: Are all substitute parts RoHS3 compliant?

A: IRFL024NTRPBF, BUK9880-55A/CUX, BUK7880-55A/CUX, STN3NF06, and STN3NF06L are all RoHS3 compliant. The original IRFL024NTR is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitutes are acceptable.

Q: Do the substitute parts have automotive qualification?

A: BUK9880-55A/CUX and BUK7880-55A/CUX include AEC-Q100 automotive qualification. IRFL024NTRPBF, STN3NF06, and STN3NF06L do not carry automotive qualification designations. Selection depends on application requirements.

Q: What is the difference between Vgs(th) specifications across the substitute parts?

A: Vgs(th) varies across substitutes: IRFL024NTR and IRFL024NTRPBF specify 4V at 250µA; BUK7880-55A/CUX specifies 4V at 1mA; BUK9880-55A/CUX specifies 2V at 1mA; STN3NF06 specifies 4V at 250µA; STN3NF06L specifies 2.8V at 250µA. Lower threshold voltages (BUK9880-55A/CUX and STN3NF06L) require less gate drive voltage for full conduction. Gate drive circuit compatibility must be verified for parts with significantly different threshold voltages.

Q: Can gate charge differences affect circuit performance?

A: Yes. Gate charge (Qg) determines the energy required to switch the MOSFET. IRFL024NTR and IRFL024NTRPBF specify 18.3nC at 10V. Substitutes range from 9nC (STN3NF06L at 5V) to 13nC (STN3NF06 at 10V). Lower gate charge reduces switching losses and improves efficiency. Gate drive circuits must supply sufficient charge to achieve specified switching performance. Verify gate driver capability when selecting parts with significantly different gate charge specifications.

Q: Is SOT-223 packaging identical across all substitute parts?

A: Yes. All substitute parts use SOT-223 surface mount packaging (TO-261-4, TO-261AA). PCB footprints and land patterns are compatible across all listed parts. No layout modifications are required for package compatibility.

Q: What inventory considerations apply to these substitutes?

A: IRFL024NTRPBF has 22,300 pcs available; BUK9880-55A/CUX has 248,200 pcs; BUK7880-55A/CUX has 35,094 pcs; STN3NF06 has 7,792 pcs; STN3NF06L has 72,446 pcs. BUK9880-55A/CUX and STN3NF06L offer the highest inventory availability for long-term supply assurance.

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