FDT459N Equivalent & Substitute Parts

Part Overview

The FDT459N is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 6.5A continuous drain current at 25°C. The device is housed in a SOT-223-4 surface mount package and is designed for general-purpose switching applications. The FDT459N is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts listed here maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	6.5	A
Rds On (Max) @ Id, Vgs	35 mOhm @ 6.5A, 10V	—
Gate Threshold Voltage Vgs(th) (Max) @ Id	2	V @ 250µA
Power Dissipation (Max)	3	W
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package	SOT-223-4	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the FDT459N are selected based on the following electrical and mechanical criteria:

Primary Compatibility Parameters:

FET Type: N-Channel
Drain to Source Voltage (Vdss): 30V minimum
Continuous Drain Current (Id): 5A or greater at 25°C
Mounting Type: Surface Mount
Package Compatibility: SOT-223 variants (SOT-223-3 or SOT-223-4)
Operating Temperature Range: Minimum -55°C to 150°C
RoHS3 Compliance and MSL 1 rating

Substitution Logic: Substitute parts must maintain the 30V Vdss rating and support continuous drain currents at or above 5A. Rds On characteristics, gate charge, and input capacitance may vary within acceptable ranges for the application class. All substitute parts are active products with current manufacturing status, ensuring long-term availability and supply chain stability.

Parameter Comparison

Parameter	FDT459N (Main)	FDT457N	DMN3032LE-13	STN4NF03L
Manufacturer	onsemi	onsemi	Diodes Incorporated	STMicroelectronics
Product Status	Obsolete	Active	Active	Active
FET Type	N-Channel	N-Channel	N-Channel	N-Channel
Vdss (V)	30	30	30	30
Id @ 25°C (A)	6.5	5	5.6	6.5
Rds On (Max) (mOhm)	35 @ 6.5A, 10V	60 @ 5A, 10V	29 @ 3.2A, 10V	50 @ 2A, 10V
Vgs(th) (Max) (V)	2 @ 250µA	3 @ 250µA	2 @ 250µA	1 @ 250µA
Gate Charge Qg (Max) (nC)	17 @ 10V	5.9 @ 5V	11.3 @ 10V	9 @ 10V
Input Capacitance Ciss (Max) (pF)	365 @ 15V	235 @ 15V	498 @ 15V	330 @ 25V
Power Dissipation (Max) (W)	3	3	1.8	3.3
Operating Temperature (°C)	-55 to 150	-65 to 150	-55 to 150	-55 to 150
Package	SOT-223-4	SOT-223-4	SOT-223-3	SOT-223
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

FDT457N (onsemi): The FDT457N is an active product from the same manufacturer as the FDT459N. It maintains the 30V Vdss rating and SOT-223-4 package compatibility. The continuous drain current is rated at 5A, which is lower than the FDT459N's 6.5A specification. This part is suitable for applications where the 5A current rating is sufficient. The FDT457N carries ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility.

DMN3032LE-13 (Diodes Incorporated): The DMN3032LE-13 is an active product with 30V Vdss and 5.6A continuous drain current. The package is SOT-223-3, which differs from the FDT459N's SOT-223-4 configuration. This part features lower Rds On at the specified measurement point (29 mOhm @ 3.2A, 10V) and reduced power dissipation (1.8W). The DMN3032LE-13 is suitable for applications prioritizing lower on-resistance and thermal performance. ROHS3 compliance and MSL 1 rating are maintained.

STN4NF03L (STMicroelectronics): The STN4NF03L is an active product rated for 30V Vdss and 6.5A continuous drain current, matching the FDT459N's current specification. The SOT-223 package is compatible with the FDT459N's footprint requirements. This part features lower gate threshold voltage (1V @ 250µA) and reduced gate charge (9 nC @ 10V), which may provide improved switching performance in certain circuit topologies. ROHS3 compliance and MSL 1 rating are confirmed.

All substitute parts are active products with established supply chains, providing superior long-term availability compared to the obsolete FDT459N.

Frequently Asked Questions (FAQ)

Q: Can the FDT457N directly replace the FDT459N in all applications?

A: The FDT457N maintains the same 30V Vdss rating, SOT-223-4 package, and surface mount configuration. However, the continuous drain current is rated at 5A versus the FDT459N's 6.5A. Direct substitution is valid only for applications where the 5A current rating is sufficient for the circuit design.

Q: What is the primary difference between the DMN3032LE-13 and the FDT459N?

A: The DMN3032LE-13 uses a SOT-223-3 package instead of the FDT459N's SOT-223-4 package. Both maintain 30V Vdss and support continuous drain currents above 5A. The DMN3032LE-13 features lower power dissipation (1.8W versus 3W) and lower Rds On at its specified measurement point. PCB layout modifications may be required due to the package difference.

Q: Is the STN4NF03L a pin-compatible replacement for the FDT459N?

A: The STN4NF03L is housed in a SOT-223 package, which is mechanically compatible with the FDT459N's SOT-223-4 footprint for surface mount applications. Both devices support 30V Vdss and 6.5A continuous drain current. Pin configuration should be verified against the specific application schematic before implementation.

Q: Do all substitute parts meet the same environmental and compliance standards as the FDT459N?

A: Yes. All substitute parts listed carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, matching the FDT459N's environmental specifications. All parts are classified as REACH Unaffected and carry EAR99 export classification.

Q: What is the operating temperature range for each substitute part?

A: The FDT457N and STN4NF03L support -55°C to 150°C (TJ), matching the FDT459N. The DMN3032LE-13 also supports -55°C to 150°C (TJ). The FDT457N extends the lower temperature limit to -65°C, providing additional thermal margin in extreme cold environments.

Q: How do gate charge and input capacitance differences affect circuit performance?

A: Gate charge and input capacitance influence switching speed and driver circuit requirements. The FDT459N has 17 nC gate charge at 10V and 365 pF input capacitance. The STN4NF03L has lower gate charge (9 nC) and comparable input capacitance (330 pF), potentially enabling faster switching. The DMN3032LE-13 has 11.3 nC gate charge and higher input capacitance (498 pF). Circuit simulation or testing is necessary to determine performance impact in specific applications.

Q: Are there inventory considerations when selecting a substitute part?

A: Current inventory levels are: FDT457N (24,662 pcs), DMN3032LE-13 (185,400 pcs), and STN4NF03L (77,761 pcs). All substitute parts are in active production with substantial stock availability, ensuring supply chain continuity compared to the obsolete FDT459N.

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