IRLML2502TR N-Channel MOSFET 20V 4.2A SOT-23 Equivalent & Substitute Parts

Part Overview

The IRLML2502TR is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 20V drain-to-source voltage with 4.2A continuous drain current in a surface mount SOT-23 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. The part operates in the micro-power switching and low-voltage gate drive applications typical of SOT-23 form factor MOSFETs. Substitute parts must maintain electrical compatibility across drain voltage, continuous current rating, on-resistance characteristics, and gate threshold voltage specifications while accommodating the surface mount package requirement.

Key Parameters

Parameter	Value	Unit	Test Condition
FET Type	N-Channel	—	—
Drain to Source Voltage (Vdss)	20	V	—
Current - Continuous Drain (Id) @ 25°C	4.2	A	Ta
Rds On (Max)	45	mOhm	@ 4.2A, 4.5V
Vgs(th) (Max)	1.2	V	@ 250µA
Gate Charge (Qg) (Max)	12	nC	@ 5V
Input Capacitance (Ciss) (Max)	740	pF	@ 15V
Mounting Type	Surface Mount	—	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—	—
Product Status	Obsolete	—	—

Substitute Part Grouping Explanation

Substitution eligibility for the IRLML2502TR is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): Must equal or exceed 20V
Continuous Drain Current (Id) @ 25°C: Must equal or exceed 4.2A
On-Resistance (Rds On): Must not exceed 45mOhm at specified gate voltage
Gate Threshold Voltage (Vgs(th)): Must not exceed 1.2V @ 250µA
Package Type: Must be SOT-23-3 or equivalent surface mount configuration
FET Type: Must be N-Channel MOSFET technology

Secondary Compatibility Parameters:

Gate Charge (Qg): Lower values indicate faster switching; values up to 12nC are acceptable
Input Capacitance (Ciss): Lower values reduce gate drive requirements; values up to 740pF are acceptable
Operating Temperature Range: Must support -55°C to 150°C minimum
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for manufacturing compatibility

Substitute parts are categorized as Direct (pin-compatible, electrical equivalent), Upgrade (improved performance within same voltage/current class), or Manufacturer Recommended (alternative from original supplier or qualified alternative source).

Parameter Comparison

Parameter	IRLML2502TR	IRLML2502TRPBF	DMN2058U-7	DMN2050L-7	DMN2056U-7	NTR4501NT1G	AO3402
Manufacturer	Infineon	Infineon	Diodes Inc.	Diodes Inc.	Diodes Inc.	onsemi	Alpha & Omega
Vdss (V)	20	20	20	20	20	20	30
Id @ 25°C (A)	4.2	4.2	4.6	5.9	4.0	3.2	4.0
Rds On (mOhm)	45 @ 4.2A, 4.5V	45 @ 4.2A, 4.5V	35 @ 6A, 10V	29 @ 5A, 4.5V	38 @ 3.6A, 4.5V	80 @ 3.6A, 4.5V	55 @ 4A, 10V
Vgs(th) (V)	1.2 @ 250µA	1.2 @ 250µA	1.2 @ 250µA	1.4 @ 250µA	1.0 @ 250µA	1.2 @ 250µA	1.4 @ 250µA
Qg (nC)	12 @ 5V	12 @ 5V	7.7 @ 10V	6.7 @ 4.5V	4.3 @ 4.5V	6 @ 4.5V	4.34 @ 4.5V
Ciss (pF)	740 @ 15V	740 @ 15V	281 @ 10V	532 @ 10V	339 @ 10V	200 @ 10V	390 @ 15V
Package	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active	Active	Not For New Designs
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Pin-Compatible Replacement):

IRLML2502TRPBF is the direct equivalent of IRLML2502TR, manufactured by Infineon Technologies. This part maintains identical electrical specifications including 20V Vdss, 4.2A continuous drain current, 45mOhm on-resistance, and 1.2V gate threshold voltage. The primary distinction is product status: IRLML2502TRPBF is Active with ROHS3 compliance, whereas the original IRLML2502TR is Obsolete and RoHS non-compliant. IRLML2502TRPBF is supplied in Cut Tape and Digi-Reel packaging with 155,300 pieces in stock, providing immediate availability for production continuity.

Upgrade Options (Enhanced Performance):

DMN2058U-7 (Diodes Incorporated) provides upgraded performance with 4.6A continuous drain current versus 4.2A, while maintaining 20V Vdss and improving on-resistance to 35mOhm at 6A/10V. Gate charge is reduced to 7.7nC, and input capacitance decreases to 281pF, resulting in faster switching characteristics. This part is Active with ROHS3 compliance and 215,400 pieces in stock.

DMN2050L-7 (Diodes Incorporated) offers the highest current capability at 5.9A continuous drain current with superior on-resistance of 29mOhm at 5A/4.5V. Gate charge is minimized at 6.7nC, and input capacitance is 532pF. This part is Active with ROHS3 compliance and suitable for applications requiring maximum current headroom within the 20V voltage class.

Alternative Options (Functional Compatibility):

DMN2056U-7 (Diodes Incorporated) maintains 20V Vdss with 4.0A continuous drain current and 38mOhm on-resistance. Gate charge is minimal at 4.3nC with 339pF input capacitance. This part is Active with ROHS3 compliance and 505,400 pieces in stock, offering the highest inventory availability.

NTR4501NT1G (onsemi) provides 20V Vdss with 3.2A continuous drain current. On-resistance is 80mOhm at 3.6A/4.5V, which exceeds the original specification. This part is suitable only for applications where the lower current rating is acceptable. It is Active with ROHS3 compliance and 70,420 pieces in stock.

Not Recommended:

AO3402 (Alpha & Omega Semiconductor) operates at 30V Vdss, exceeding the 20V specification of the original part. While this provides voltage margin, the higher voltage rating introduces unnecessary cost and may not be suitable for 20V-rated circuit designs. Product status is Not For New Designs, limiting long-term availability.

Frequently Asked Questions (FAQ)

Q: Can IRLML2502TRPBF be used as a direct replacement for IRLML2502TR?

A: Yes. IRLML2502TRPBF is the direct equivalent with identical electrical specifications. The primary difference is product status: IRLML2502TRPBF is Active and ROHS3 compliant, whereas IRLML2502TR is Obsolete and RoHS non-compliant. Pin configuration and package (SOT-23-3) are identical, enabling direct PCB substitution.

Q: What is the difference between the Diodes Incorporated upgrade options?

A: DMN2058U-7 provides 4.6A current with 35mOhm on-resistance and 7.7nC gate charge. DMN2050L-7 offers the highest performance with 5.9A current and 29mOhm on-resistance but with 6.7nC gate charge. DMN2056U-7 delivers 4.0A current with 38mOhm on-resistance and the lowest gate charge at 4.3nC. Selection depends on whether the application prioritizes current capacity, on-resistance minimization, or gate drive efficiency.

Q: Are all substitute parts available in SOT-23-3 packaging?

A: Yes. All listed substitute parts are supplied in SOT-23-3 (TO-236-3, SC-59) surface mount packages, maintaining mechanical compatibility with the original IRLML2502TR footprint.

Q: What does "Product Status: Active" mean for substitute parts?

A: Active status indicates the part is in current production with ongoing manufacturer support, long-term availability, and continued compliance certifications. This contrasts with Obsolete (IRLML2502TR) or Not For New Designs (AO3402), which have limited or declining availability.

Q: Why is RoHS compliance important for substitution?

A: ROHS3 compliance ensures the substitute part meets current environmental and hazardous substance restrictions. The original IRLML2502TR is RoHS non-compliant, making ROHS3-compliant substitutes necessary for applications subject to RoHS regulations or customer requirements.

Q: Can NTR4501NT1G be used if the application only requires 3.2A?

A: Yes, if the application's maximum current requirement does not exceed 3.2A. However, the 80mOhm on-resistance is higher than the original 45mOhm specification, resulting in increased power dissipation. Thermal analysis is required to confirm acceptability in the target application.

Q: What is the significance of gate charge (Qg) differences?

A: Lower gate charge reduces the energy required to switch the MOSFET on and off, decreasing gate driver power consumption and enabling faster switching transitions. Upgrade options (DMN2058U-7, DMN2050L-7, DMN2056U-7) feature reduced gate charge (4.3–7.7nC) compared to the original 12nC, improving overall circuit efficiency.

Q: Is AO3402 suitable as a substitute despite the 30V rating?

A: AO3402 is not recommended. The 30V Vdss rating exceeds the original 20V specification, introducing unnecessary cost and potential circuit design complications. Additionally, AO3402 carries a "Not For New Designs" status, limiting long-term availability and manufacturer support.

Q: What packaging options are available for these substitute parts?

A: Substitute parts are supplied in Cut Tape (CT), Digi-Reel, or Tape & Reel (TR) formats. All maintain the SOT-23-3 surface mount package configuration. Packaging selection depends on production volume and assembly equipment compatibility.

Q: How do I verify compatibility before implementing a substitute?

A: Confirm that the substitute part meets or exceeds the original specifications for Vdss, continuous drain current (Id), on-resistance (Rds On), and gate threshold voltage (Vgs(th)). Verify package compatibility (SOT-23-3) and review thermal performance if on-resistance differs significantly. Consult the substitute part's datasheet for detailed electrical characteristics and operating conditions.

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