IRLML6402GTRPBF P-Channel MOSFET 20V 3.7A SOT-23 Equivalent & Substitute Parts

Part Overview

The IRLML6402GTRPBF is a P-Channel MOSFET manufactured by Infineon Technologies, designed for surface mount applications in the SOT-23 package. This device operates at 20V drain-to-source voltage with a continuous drain current rating of 3.7A at 25°C and maximum power dissipation of 1.3W. The part is classified as Obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating the SOT-23 surface mount package format.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain-to-Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	3.7	A
On-State Resistance (Rds On) @ 3.7A, 4.5V	65	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	1.2	V
Maximum Gate Voltage (Vgs)	±12	V
Power Dissipation (Max)	1.3	W
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3 / TO-236-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 20V
Continuous Drain Current (Id): Must equal or exceed 3.7A at 25°C
Package Type: Must be SOT-23-3 / TO-236-3 surface mount configuration
FET Channel Type: Must be P-Channel
Technology: Must be MOSFET (Metal Oxide Semiconductor)
Operating Temperature Range: Must span -55°C to 150°C minimum
RoHS Compliance: Must be ROHS3 Compliant

Secondary Compatibility Parameters:

On-State Resistance (Rds On): Lower or equal values preferred; values up to 85mOhm acceptable
Gate Threshold Voltage (Vgs(th)): Range 900mV to 1.5V acceptable
Maximum Gate Voltage (Vgs): ±8V or ±12V acceptable
Power Dissipation: 1.3W or greater acceptable

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary parameters with Active product status) and Functional Alternatives (meeting electrical requirements with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On @ Rated Id, 4.5V (mOhm)	Vgs(th) @ 250µA (V)	Vgs Max (±V)	Power Dissipation (W)	Product Status	Package
IRLML6402GTRPBF	Infineon	20	3.7	65	1.2	12	1.3	Obsolete	SOT-23-3
IRLML6402TRPBF	Infineon	20	3.7	65	1.2	12	1.3	Active	SOT-23-3
DMP2305U-7	Diodes Inc.	20	4.2	60	0.9	8	1.4	Active	SOT-23-3
DMP2305UQ-7	Diodes Inc.	20	4.2	60	0.9	8	1.4	Active	SOT-23-3
PMV50XPR	Nexperia	20	3.6	60	0.9	12	0.49 (Ta)	Active	SOT-23-3
AO3419	Alpha & Omega	20	3.5	85	1.4	12	1.4	Active	SOT-23-3
PMV65XP,215	Nexperia	20	2.8	74	0.9	12	0.48	Active	SOT-23-3
PMV50UPE,215	Nexperia	20	3.2	66	0.9	8	0.5	Active	SOT-23-3
FDN304P	onsemi	20	2.4	52	1.5	8	0.5	Active	SOT-23-3
FDN302P	onsemi	20	2.4	55	1.5	12	0.5	Active	SOT-23-3
FDN340P	UMW	20	2.0	70	1.5	8	1.1	Active	SOT-23-3

Engineering Selection Recommendations

Direct Equivalent (Highest Compatibility):

IRLML6402TRPBF from Infineon Technologies is the direct equivalent to the obsolete IRLML6402GTRPBF. This part maintains identical electrical specifications across all rated parameters: 20V Vdss, 3.7A continuous drain current, 65mOhm Rds On, and 1.3W power dissipation. The part carries Active product status, ensuring long-term availability and supply chain continuity. ROHS3 compliance and identical thermal characteristics (-55°C to 150°C) confirm full functional interchangeability. This is the recommended primary substitute for direct replacement applications.

Primary Functional Alternatives (≥3.5A Drain Current):

DMP2305U-7 and DMP2305UQ-7 from Diodes Incorporated exceed the original specification with 4.2A continuous drain current and improved 60mOhm Rds On performance. Both maintain 20V Vdss rating and SOT-23-3 package compatibility. DMP2305UQ-7 includes AEC-Q101 automotive qualification and Tape & Reel packaging. These parts are suitable for applications requiring enhanced current handling or thermal performance margins.

PMV50XPR from Nexperia USA Inc. provides 3.6A continuous drain current with 60mOhm Rds On and maintains ±12V gate voltage rating matching the original design. Active product status and ROHS3 compliance confirm suitability for new designs.

Secondary Functional Alternatives (3.2A to 3.5A Drain Current):

AO3419 from Alpha & Omega Semiconductor delivers 3.5A continuous drain current with 1.4W power dissipation. Gate threshold voltage of 1.4V and ±12V gate rating provide design flexibility. Active status and ROHS3 compliance support production continuity.

PMV50UPE,215 from Nexperia provides 3.2A continuous drain current with 66mOhm Rds On. Tape & Reel packaging and Active status support high-volume manufacturing requirements.

Limited Current Applications (2.4A to 2.8A Drain Current):

FDN304P and FDN302P from onsemi, and PMV65XP,215 from Nexperia are suitable only for applications where continuous drain current requirements do not exceed 2.8A. These parts offer lower power dissipation (500mW to 480mW) and improved Rds On characteristics but cannot support the full 3.7A rating of the original device. Selection of these alternatives requires circuit redesign or current derating analysis.

FDN340P from UMW is limited to 2.0A continuous drain current and is suitable only for low-current applications.

Selection Criteria Summary:

For direct replacement in existing designs: Select IRLML6402TRPBF
For applications requiring enhanced performance: Select DMP2305U-7, DMP2305UQ-7, or PMV50XPR
For automotive-qualified designs: Select DMP2305UQ-7
For current-limited applications below 3.5A: Evaluate secondary alternatives based on specific circuit requirements

All recommended substitutes maintain ROHS3 compliance, operating temperature range of -55°C to 150°C, and SOT-23-3 surface mount package compatibility.

Frequently Asked Questions (FAQ)

Q1: Can IRLML6402TRPBF be used as a direct replacement for IRLML6402GTRPBF?

A: Yes. IRLML6402TRPBF is the direct equivalent with identical electrical specifications. The only difference is product status: IRLML6402GTRPBF is Obsolete while IRLML6402TRPBF is Active. All parameters including 20V Vdss, 3.7A continuous drain current, 65mOhm Rds On, and 1.3W power dissipation are identical. No circuit modifications are required.

Q2: What is the minimum drain current rating required for a substitute part?

A: The substitute part must support at least 3.7A continuous drain current at 25°C to maintain full compatibility with the original IRLML6402GTRPBF specification. Parts rated below 3.7A (such as FDN304P at 2.4A or PMV65XP,215 at 2.8A) can only be used in applications where the actual circuit current requirement is lower than the original design specification.

Q3: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed substitute parts use the SOT-23-3 package (also designated TO-236-3 or SC-59), which maintains identical pin configuration and PCB footprint. Direct PCB substitution is possible without layout modifications. However, verify that the specific part number variant (such as Tape & Reel vs. Cut Tape packaging) matches your procurement and assembly requirements.

Q4: What is the significance of the Vgs(th) variation among substitute parts?

A: Gate threshold voltage (Vgs(th)) determines the gate voltage at which the MOSFET begins to conduct. The original IRLML6402GTRPBF specifies 1.2V @ 250µA. Substitute parts range from 0.9V to 1.5V. Lower Vgs(th) values (0.9V) enable faster switching at lower gate drive voltages, while higher values (1.5V) require higher gate drive voltages. Verify that your gate driver circuit can supply the required gate voltage for the selected substitute part. Most modern gate drivers support the full range of Vgs(th) values listed.

Q5: Why do some substitute parts have lower power dissipation ratings?

A: Power dissipation ratings reflect the maximum thermal capability of the specific device design and package implementation. Parts such as PMV50XPR (490mW) and PMV65XP,215 (480mW) have lower ratings than the original 1.3W specification due to different thermal design approaches. These lower ratings do not indicate reduced performance; they reflect conservative thermal specifications. For applications where thermal margin is critical, select parts with power dissipation ratings equal to or exceeding 1.3W.

Q6: Is AEC-Q101 automotive qualification required for my application?

A: AEC-Q101 qualification is required only for automotive applications subject to automotive industry standards. DMP2305UQ-7 is the only listed substitute with explicit AEC-Q101 qualification. For non-automotive applications, AEC-Q101 qualification is not necessary. All listed parts maintain ROHS3 compliance and operating temperature range of -55°C to 150°C, which satisfy most industrial and consumer applications.

Q7: Can I use DMP2305U-7 and DMP2305UQ-7 interchangeably?

A: DMP2305U-7 and DMP2305UQ-7 have identical electrical specifications and both are rated for 4.2A continuous drain current. The primary difference is packaging: DMP2305U-7 is available in Cut Tape (CT) & Digi-Reel format, while DMP2305UQ-7 is supplied in Tape & Reel (TR) format with AEC-Q101 automotive qualification. Select based on your procurement and assembly process requirements. Electrically, they are fully interchangeable.

Q8: What does "Rds On @ 3.7A, 4.5V" mean, and why is it important?

A: Rds On (on-state resistance) is the drain-to-source resistance when the MOSFET is fully conducting. The specification "65mOhm @ 3.7A, 4.5V" indicates that when 3.7A drain current flows and the gate is driven to 4.5V, the resistance is 65 milliohms. Lower Rds On values reduce power loss and heat generation. Substitute parts with equal or lower Rds On values (such as DMP2305U-7 at 60mOhm) provide improved efficiency. Higher Rds On values (such as AO3419 at 85mOhm) increase power dissipation and may require thermal management review.

Q9: Why is the maximum gate voltage (Vgs) different among substitute parts?

A: Maximum gate voltage (Vgs) specifies the safe operating range for gate drive signals. The original IRLML6402GTRPBF allows ±12V gate voltage. Some substitutes (such as DMP2305U-7 and AO3419) limit Vgs to ±8V. If your gate driver circuit supplies ±12V, verify that the selected substitute part supports this voltage. Parts rated for ±8V Vgs will be damaged if exposed to ±12V gate signals. Conversely, parts rated for ±12V can safely operate with ±8V gate drive signals.

Q10: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape (CT) packaging supplies components on continuous tape that is cut into individual pieces for manual or semi-automated assembly. Tape & Reel (TR) packaging supplies components on continuous tape wound on reels for high-speed automated assembly equipment. Both formats contain identical components; the difference is in supply format and handling. Select based on your assembly process: manual/semi-automated assembly typically uses Cut Tape, while high-volume automated assembly uses Tape & Reel.

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