FDD9409L-F085 Equivalent & Substitute Parts

Part Overview

The FDD9409L-F085 is an N-Channel 40V 90A MOSFET manufactured by onsemi in the PowerTrench® series, housed in a TO-252AA surface mount package. This device is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. The part delivers 150W maximum power dissipation and operates across a temperature range of -55°C to 175°C (TJ). Substitute parts must maintain electrical compatibility across drain-source voltage, continuous drain current, on-resistance characteristics, and thermal performance parameters while accommodating available packaging options.

Key Parameters

Parameter	FDD9409L-F085	Unit
Drain to Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	90	A (Tc)
Rds On (Max) @ Id, Vgs	2.6	mOhm @ 80A, 10V
Gate Charge (Qg) (Max) @ Vgs	68	nC @ 10V
Input Capacitance (Ciss) (Max) @ Vds	3360	pF @ 20V
Power Dissipation (Max)	150	W (Tj)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 (DPAK)	Surface Mount
Vgs (Max)	±20	V
Vgs(th) (Max) @ Id	3	V @ 250µA

Substitute Part Grouping Explanation

Substitution eligibility for the FDD9409L-F085 is determined by the following critical parameters:

Primary Electrical Compatibility Criteria:

Drain to Source Voltage (Vdss): Must equal or exceed 40V
Continuous Drain Current (Id) @ 25°C: Must meet or exceed 90A (Tc)
On-Resistance (Rds On): Must not exceed 2.6mOhm @ specified conditions to maintain thermal performance
Gate Charge (Qg): Lower values reduce switching losses; values up to 134nC remain acceptable
Input Capacitance (Ciss): Values between 3100pF and 5509pF maintain switching characteristics
Power Dissipation: Must support minimum 150W thermal capability
Operating Temperature: Must span -55°C to 175°C (TJ)

Package and Mechanical Compatibility:

Surface mount technology required
TO-252-3 (DPAK) package preferred for direct mechanical replacement
Alternative packages (5-DFN) acceptable with PCB layout modification

Compliance and Status:

RoHS3 compliance required
Active product status preferred; obsolete status acceptable for legacy applications
MSL rating of 1 (Unlimited) or 3 (168 Hours) acceptable

The three identified substitute parts meet these criteria with varying trade-offs in current rating, on-resistance, and package configuration.

Parameter Comparison

Parameter	FDD9409L-F085	NVMFS5C442NLAFT1G	IRFR7440TRPBF	TSM038N04LCP ROG	Unit
Manufacturer	onsemi	onsemi	Infineon Technologies	Taiwan Semiconductor Corporation	—
Drain to Source Voltage (Vdss)	40	40	40	40	V
Continuous Drain Current (Id) @ 25°C	90 (Tc)	130 (Tc)	90 (Tc)	135 (Tc)	A
Rds On (Max) @ Id, Vgs	2.6 @ 80A, 10V	2.5 @ 50A, 10V	2.4 @ 90A, 10V	3.8 @ 19A, 10V	mOhm
Gate Charge (Qg) (Max) @ Vgs	68 @ 10V	50 @ 10V	134 @ 10V	104 @ 10V	nC
Input Capacitance (Ciss) (Max) @ Vds	3360 @ 20V	3100 @ 25V	4610 @ 25V	5509 @ 20V	pF
Power Dissipation (Max)	150 (Tj)	83 (Tc)	140 (Tc)	125 (Tc)	W
Operating Temperature Range	-55 to 175	-55 to 175	-55 to 175	-55 to 150	°C (TJ)
Vgs (Max)	±20	±20	±20	±20	V
Vgs(th) (Max) @ Id	3 @ 250µA	2 @ 250µA	3.9 @ 100µA	2.5 @ 250µA	V
Package Type	TO-252-3 (DPAK)	5-DFN (5x6)	TO-252-3 (DPAK)	TO-252-3 (DPAK)	—
Product Status	Obsolete	Active	Active	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	—

Engineering Selection Recommendations

IRFR7440TRPBF (Infineon Technologies) — Preferred Direct Replacement

The IRFR7440TRPBF provides the closest electrical and mechanical match to the FDD9409L-F085. Both devices share identical 40V Vdss rating, 90A continuous drain current (Tc), and TO-252-3 (DPAK) package configuration. The IRFR7440TRPBF exhibits superior on-resistance performance (2.4mOhm @ 90A, 10V versus 2.6mOhm), resulting in lower power dissipation and improved thermal efficiency. Gate charge is elevated at 134nC compared to 68nC, introducing marginally higher switching losses. The device maintains full temperature range compatibility (-55°C to 175°C TJ), RoHS3 compliance, and MSL 1 rating. Active product status ensures long-term availability and supply chain stability. This part is suitable for direct PCB substitution without layout modification.

TSM038N04LCP ROG (Taiwan Semiconductor Corporation) — Alternative with Enhanced Current Rating

The TSM038N04LCP ROG delivers 135A continuous drain current (Tc), exceeding the original 90A specification by 50%, providing design margin for thermal and electrical stress. The TO-252-3 (DPAK) package enables direct mechanical replacement. On-resistance of 3.8mOhm @ 19A, 10V is higher than the original specification, resulting in increased power dissipation under full-load conditions. Gate charge of 104nC and input capacitance of 5509pF are elevated, increasing switching losses. Operating temperature range is limited to -55°C to 150°C (TJ), reducing the upper thermal boundary by 25°C. Moisture sensitivity level is rated MSL 3 (168 Hours), requiring controlled storage conditions. Active product status supports ongoing availability. This part is suitable for applications where enhanced current capacity justifies increased on-resistance and thermal management considerations.

NVMFS5C442NLAFT1G (onsemi) — Alternative with Optimized On-Resistance

The NVMFS5C442NLAFT1G is an onsemi product offering 130A continuous drain current (Tc) and superior on-resistance of 2.5mOhm @ 50A, 10V. The 5-DFN (5x6) package requires PCB layout modification and is not mechanically compatible with TO-252-3 footprints. Gate charge is reduced to 50nC, minimizing switching losses. Input capacitance of 3100pF is the lowest among substitutes, optimizing switching performance. The device maintains full temperature range (-55°C to 175°C TJ), RoHS3 compliance, and MSL 1 rating. Automotive qualification (AEC-Q101) provides additional reliability assurance. This part is suitable for new designs where package footprint flexibility exists and optimized switching characteristics are prioritized.

Frequently Asked Questions (FAQ)

Q: Can the IRFR7440TRPBF be used as a direct replacement for the FDD9409L-F085 without PCB modification?

A: Yes. Both devices utilize the TO-252-3 (DPAK) package with identical pinout and mechanical dimensions. No PCB layout changes are required. Electrical parameters are compatible within design tolerances.

Q: What is the primary disadvantage of the TSM038N04LCP ROG compared to the FDD9409L-F085?

A: The TSM038N04LCP ROG exhibits higher on-resistance (3.8mOhm @ 19A, 10V versus 2.6mOhm @ 80A, 10V), resulting in increased power dissipation and thermal load. Additionally, the maximum operating temperature is limited to 150°C (TJ) versus 175°C for the original part.

Q: Why does the NVMFS5C442NLAFT1G require PCB modification?

A: The NVMFS5C442NLAFT1G uses a 5-DFN (5x6) package, which has a different footprint, pin count, and spacing compared to the TO-252-3 (DPAK) package of the FDD9409L-F085. PCB layout redesign is necessary to accommodate the alternative package.

Q: Which substitute part offers the best on-resistance performance?

A: The IRFR7440TRPBF provides the best on-resistance at 2.4mOhm @ 90A, 10V, followed closely by the NVMFS5C442NLAFT1G at 2.5mOhm @ 50A, 10V. The TSM038N04LCP ROG exhibits higher on-resistance at 3.8mOhm @ 19A, 10V.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts (IRFR7440TRPBF, TSM038N04LCP ROG, and NVMFS5C442NLAFT1G) are RoHS3 compliant and meet environmental regulatory requirements.

Q: What is the significance of the MSL 3 rating on the TSM038N04LCP ROG?

A: MSL 3 (168 Hours) indicates the device requires controlled storage conditions with humidity levels below 60% relative humidity. Exposure to higher humidity for extended periods may compromise solder joint reliability. MSL 1 (Unlimited) parts, such as the IRFR7440TRPBF and NVMFS5C442NLAFT1G, have no moisture sensitivity restrictions.

Q: Can the NVMFS5C442NLAFT1G be used in automotive applications?

A: Yes. The NVMFS5C442NLAFT1G carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. The IRFR7440TRPBF and TSM038N04LCP ROG do not carry explicit automotive qualification in the provided specifications.

Q: What is the impact of higher gate charge on switching performance?

A: Higher gate charge (Qg) increases the energy required to switch the device on and off, resulting in increased switching losses and heat generation. The IRFR7440TRPBF (134nC) and TSM038N04LCP ROG (104nC) exhibit higher gate charge than the original FDD9409L-F085 (68nC) and NVMFS5C442NLAFT1G (50nC), potentially requiring driver circuit optimization.

Q: Is the FDD9409L-F085 still available for purchase?

A: The FDD9409L-F085 is classified as obsolete. However, 4054 pieces are reported in current inventory. Long-term availability is not guaranteed, making transition to active substitute parts advisable for new production designs.

Q: Which substitute part is recommended for new design implementations?

A: The IRFR7440TRPBF is recommended for new designs requiring direct mechanical and electrical compatibility with minimal redesign effort. The NVMFS5C442NLAFT1G is recommended for new designs where package footprint flexibility exists and optimized switching characteristics are prioritized. The TSM038N04LCP ROG is suitable for applications requiring enhanced current capacity with acceptance of increased on-resistance.

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