FDN337N N-Channel 30V 2.2A MOSFET Equivalent & Substitute Parts

Part Overview

The FDN337N is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 2.2A continuous drain current at 25°C. The device is housed in a SOT-23-3 surface mount package and dissipates a maximum of 500mW. This part is currently in active production status with 120,090 pieces in stock inventory.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing is required for supply chain resilience, or when design specifications allow for components with comparable electrical and mechanical characteristics within the same package family.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	2.2	A
On-Resistance (Rds On) @ 2.2A, 4.5V	65	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	1	V
Gate Charge (Qg) @ 4.5V	9	nC
Power Dissipation (Max)	500	mW
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the FDN337N is determined by the following critical parameters:

Electrical Compatibility Requirements:

Drain-to-Source Voltage (Vdss) must be ≥30V
Continuous Drain Current (Id) must be ≥2.2A at 25°C
On-Resistance (Rds On) characteristics must support the application's switching and conduction losses
Gate Threshold Voltage (Vgs(th)) must be compatible with the drive circuit
Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Requirements:

Package type must be SOT-23-3 or equivalent footprint (TO-236-3, SC-59)
Surface mount configuration required
Moisture Sensitivity Level (MSL) of 1 (Unlimited) preferred for handling compatibility

Regulatory Compliance:

RoHS3 compliance required
REACH Unaffected status required

Substitute parts are grouped into two categories: Direct Equivalents (matching or exceeding all key parameters with minimal derating) and Higher-Performance Alternatives (exceeding current and power dissipation ratings while maintaining voltage and package compatibility).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Power Diss. (mW)	Package	Status
FDN337N	onsemi	30	2.2	65 @ 2.2A, 4.5V	1 @ 250µA	9 @ 4.5V	500	SOT-23-3	Active
DMN3200U-7	Diodes Inc.	30	2.2	90 @ 2.2A, 4.5V	1 @ 250µA	—	650	SOT-23-3	Active
NTR4170NT1G	onsemi	30	2.4	55 @ 3.2A, 10V	1.4 @ 250µA	4.76 @ 4.5V	480	SOT-23-3	Active
BSS306NH6327XTSA1	Infineon	30	2.3	57 @ 2.3A, 10V	2 @ 11µA	1.5 @ 5V	500	SOT-23-3	Active
DMG3402L-7	Diodes Inc.	30	4	52 @ 4A, 10V	1.4 @ 250µA	11.7 @ 10V	1400	SOT-23-3	Active
DMG3418L-7	Diodes Inc.	30	4	60 @ 4A, 10V	1.5 @ 250µA	5.5 @ 4.5V	1400	SOT-23-3	Active
AO3402	Alpha & Omega	30	4	55 @ 4A, 10V	1.4 @ 250µA	4.34 @ 4.5V	1400	SOT-23-3	Not For New Designs
PJA3402-AU_R1_000A1	Panjit Int'l	30	4.4	48 @ 4.4A, 10V	1.2 @ 250µA	11.3 @ 10V	1200	SOT-23-3	Active
PMV28ENEAR	Nexperia	30	4.4	37 @ 4.4A, 10V	2.5 @ 250µA	8 @ 10V	660	TO-236AB	Active
PMV50ENEAR	Nexperia	30	3.9	43 @ 3.9A, 10V	2.5 @ 250µA	10 @ 10V	510	TO-236AB	Not For New Designs
RTR040N03TL	Rohm Semi.	30	4	48 @ 4A, 4.5V	1.5 @ 1mA	8.3 @ 4.5V	1000	TSMT3	Active

Engineering Selection Recommendations

Direct Equivalents (Minimum Derating):

The NTR4170NT1G and BSS306NH6327XTSA1 are the closest functional equivalents to the FDN337N. Both devices maintain the 30V Vdss rating, exceed the 2.2A continuous drain current requirement, and are housed in SOT-23-3 packages. Both are in active production status. The NTR4170NT1G offers improved on-resistance characteristics (55mOhm vs. 65mOhm), while the BSS306NH6327XTSA1 provides lower gate charge (1.5nC vs. 9nC), beneficial for high-frequency switching applications. Both comply with RoHS3 and REACH requirements.

Higher-Performance Alternatives (Increased Current Capability):

The DMG3402L-7, DMG3418L-7, and PJA3402-AU_R1_000A1 provide 4A to 4.4A continuous drain current ratings, representing a 82% to 100% increase over the FDN337N. These devices maintain 30V Vdss and SOT-23-3 packaging. All three are in active production. The DMG3402L-7 offers the lowest on-resistance (52mOhm), while the PJA3402-AU_R1_000A1 includes AEC-Q101 automotive qualification. These alternatives are suitable for applications requiring higher current headroom or thermal margin.

Nexperia Automotive-Grade Options:

The PMV28ENEAR and PMV50ENEAR are AEC-Q101 qualified automotive-grade devices with extended temperature operation (PMV28ENEAR to 175°C). The PMV28ENEAR delivers 4.4A at superior on-resistance (37mOhm) and is in active production. The PMV50ENEAR is marked "Not For New Designs" and should be avoided for new applications.

Parts to Avoid:

The AO3402 is marked "Not For New Designs" and should not be selected for new circuit implementations. The PMV50ENEAR carries the same obsolescence designation.

Package Consideration:

The RTR040N03TL uses a TSMT3 package (SC-96) rather than SOT-23-3, requiring PCB layout modification. This part is suitable only when footprint redesign is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the DMN3200U-7 be used as a direct replacement for the FDN337N?

A: The DMN3200U-7 matches the 30V voltage rating and 2.2A current rating in the same SOT-23-3 package. However, its on-resistance is higher (90mOhm vs. 65mOhm at 4.5V), resulting in increased power dissipation. It is suitable for applications where the additional conduction loss is acceptable within the thermal budget.

Q: What is the advantage of using NTR4170NT1G over FDN337N?

A: The NTR4170NT1G provides lower on-resistance (55mOhm vs. 65mOhm), reduced gate charge (4.76nC vs. 9nC), and slightly higher current rating (2.4A vs. 2.2A). These characteristics reduce switching losses and improve efficiency, particularly in high-frequency applications. Both devices are in active production and fully compliant.

Q: Are the higher-current alternatives (4A rated) suitable for 2.2A applications?

A: Yes. Devices rated for 4A or higher can be used in 2.2A applications. The higher current rating provides thermal margin and reduced on-resistance at the operating current, improving efficiency and reliability. No circuit modification is required.

Q: Why should AO3402 be avoided?

A: The AO3402 is marked "Not For New Designs" by the manufacturer, indicating end-of-life status. While existing inventory may be available, new designs should select active-status alternatives to ensure long-term supply availability and manufacturer support.

Q: What is the difference between SOT-23-3 and TSMT3 packages?

A: SOT-23-3 (TO-236-3) and TSMT3 (SC-96) are different physical packages with different footprints and pin configurations. The RTR040N03TL uses TSMT3 and requires a different PCB layout. Direct footprint substitution is not possible without redesign.

Q: Are automotive-qualified parts (AEC-Q101) necessary for non-automotive applications?

A: AEC-Q101 qualification is not required for non-automotive applications. However, automotive-qualified parts such as PJA3402-AU_R1_000A1 and PMV28ENEAR undergo additional reliability testing and are suitable for applications requiring higher reliability standards, regardless of end application.

Q: Can I use PMV28ENEAR in place of FDN337N without circuit changes?

A: The PMV28ENEAR is electrically compatible (30V, 4.4A, SOT-23-3 package). However, its gate threshold voltage is higher (2.5V vs. 1V), which may affect gate drive requirements. Verify that the drive circuit can reliably turn on the device at the specified Vgs(th) before substitution.

Q: What does "Moisture Sensitivity Level 1 (Unlimited)" mean?

A: MSL 1 indicates the component has unlimited shelf life and does not require special moisture-control handling during storage or assembly. All listed parts carry MSL 1 rating, ensuring compatibility with standard manufacturing processes.

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