FDMS9409-F085 N-Channel 40V 65A Power MOSFET Equivalent & Substitute Parts

Part Overview

The FDMS9409-F085 is an N-Channel 40V 65A power MOSFET manufactured by onsemi, designed for surface mount applications in the PowerTrench® series. This device operates with a maximum drain-to-source voltage of 40V and continuous drain current of 65A at 25°C case temperature, delivering 100W maximum power dissipation. The part is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements.

The FDMS9409-F085 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring N-Channel 40V power MOSFETs with comparable electrical and thermal characteristics.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	65	A (Tc)
On-Resistance (Rds On) @ 65A, 10V	3.2	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	62	nC
Input Capacitance (Ciss) @ 20V	3130	pF
Power Dissipation (Max)	100	W (Tj)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	8-PowerVDFN	Surface Mount
Automotive Grade	AEC-Q101	Qualified

Substitute Part Grouping Explanation

Substitution of the FDMS9409-F085 is determined by electrical and thermal compatibility within the following critical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal 40V
Continuous Drain Current (Id) @ 25°C: Must meet or exceed 65A at case temperature (Tc)
On-Resistance (Rds On): Must not exceed 3.2mOhm at rated current and 10V gate drive
Operating Temperature Range: Must support -55°C to 175°C minimum
Automotive Qualification: AEC-Q101 certification required for direct replacement
Surface Mount Mounting Type: Required for PCB compatibility
RoHS3 Compliance: Mandatory for regulatory alignment

Secondary Compatibility Factors:

Gate Charge (Qg) and Input Capacitance (Ciss): Influence switching performance and gate drive requirements
Gate Threshold Voltage (Vgs(th)): Affects gate drive voltage compatibility
Package footprint: 8-PowerVDFN or equivalent surface mount packages acceptable

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary criteria with AEC-Q101 qualification) and Functional Alternatives (meeting electrical specifications with active product status or alternative automotive qualification).

Parameter Comparison

Parameter	FDMS9409-F085	IPC100N04S52R8ATMA1	BSZ028N04LSATMA1	IPC90N04S5L3R3ATMA1	IPZ40N04S5L2R8ATMA1	IPZ40N04S53R1ATMA1	NVMFS5C450NAFT1G	RS1G260MNTB
Manufacturer	onsemi	Infineon	Infineon	Infineon	Infineon	Infineon	onsemi	Rohm
Vdss (V)	40	40	40	40	40	40	40	40
Id @ 25°C (A, Tc)	65	100	40	90	40	40	102	80
Rds On (mOhm) @ 10V	3.2 @ 65A	2.8 @ 50A	2.8 @ 20A	3.3 @ 45A	2.8 @ 20A	3.1 @ 20A	3.3 @ 50A	3.3 @ 26A
Vgs(th) (V)	4 @ 250µA	3.4 @ 30µA	Not specified	2 @ 23µA	2 @ 30µA	3.4 @ 30µA	3.5 @ 65µA	2.5 @ 1mA
Qg (nC) @ 10V	62	45	32	40	52	41	23	44
Ciss (pF) @ 20-25V	3130 @ 20V	2600 @ 25V	2300 @ 20V	2145 @ 25V	2800 @ 25V	2310 @ 25V	1600 @ 25V	2988 @ 20V
Power Dissipation (W, Tc)	100	75	63	62	71	71	68	35
Operating Temp Range (°C)	-55 to 175	-55 to 175	-55 to 150	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 150
AEC-Q101	Yes	No	Not specified	Yes	Yes	Yes	Yes	Not specified
Product Status	Obsolete	Not For New Designs	Active	Not For New Designs	Active	Active	Active	Active
Package	8-PowerVDFN	8-PowerTDFN	8-PowerTDFN	8-PowerTDFN	8-PowerVDFN	8-PowerVDFN	8-PowerTDFN, 5 Leads	8-PowerTDFN

Engineering Selection Recommendations

Tier 1: Direct Equivalents (Preferred for Replacement)

The following parts satisfy all primary substitution criteria with active product status and full AEC-Q101 automotive qualification:

IPZ40N04S5L2R8ATMA1 (Infineon OptiMOS™-5): Meets 40V/40A specification with 2.8mOhm Rds On, full -55°C to 175°C operating range, AEC-Q101 qualified, and active product status. Highest inventory availability (373,255 units). Package compatibility: 8-PowerVDFN.
IPZ40N04S53R1ATMA1 (Infineon OptiMOS™-5): Meets 40V/40A specification with 3.1mOhm Rds On, full -55°C to 175°C operating range, AEC-Q101 qualified, and active product status. Package compatibility: 8-PowerVDFN.

Tier 2: Functional Alternatives (Higher Current Capability)

The following parts exceed the 65A continuous drain current requirement with compatible electrical characteristics:

IPC100N04S52R8ATMA1 (Infineon OptiMOS™): Delivers 100A continuous drain current at 40V with 2.8mOhm Rds On and full -55°C to 175°C operating range. Product status is "Not For New Designs." AEC-Q101 qualification not specified. Package: 8-PowerTDFN.
IPC90N04S5L3R3ATMA1 (Infineon OptiMOS™): Delivers 90A continuous drain current at 40V with 3.3mOhm Rds On and full -55°C to 175°C operating range. AEC-Q101 qualified. Product status is "Not For New Designs." Package: 8-PowerTDFN.
NVMFS5C450NAFT1G (onsemi): Delivers 102A continuous drain current at 40V with 3.3mOhm Rds On and full -55°C to 175°C operating range. AEC-Q101 qualified with active product status. Package: 8-PowerTDFN, 5 Leads.

Tier 3: Reduced Current Alternatives (Lower Current Capability)

The following parts operate at 40V with reduced continuous drain current specifications:

BSZ028N04LSATMA1 (Infineon OptiMOS™): Delivers 40A continuous drain current at 40V with 2.8mOhm Rds On. Operating temperature range limited to -55°C to 150°C. Active product status. Package: 8-PowerTDFN.
RS1G260MNTB (Rohm Semiconductor): Delivers 80A continuous drain current at 40V with 3.3mOhm Rds On. Operating temperature range limited to 150°C maximum. Active product status. Package: 8-PowerTDFN.

Selection Guidance:

For direct replacement of the obsolete FDMS9409-F085 in existing designs, select from Tier 1 parts. Both IPZ40N04S5L2R8ATMA1 and IPZ40N04S53R1ATMA1 provide equivalent 40V/40A operation with AEC-Q101 qualification and active product availability. IPZ40N04S5L2R8ATMA1 offers superior inventory depth.

For new designs or applications requiring higher current capability, Tier 2 alternatives provide 90A to 102A continuous drain current with maintained 40V voltage rating and automotive qualification.

Tier 3 alternatives are suitable only for applications where continuous drain current requirements do not exceed 40A or where operating temperature limits of 150°C are acceptable.

Frequently Asked Questions (FAQ)

Q: Can IPZ40N04S5L2R8ATMA1 directly replace FDMS9409-F085 in existing PCB layouts?

A: IPZ40N04S5L2R8ATMA1 uses the 8-PowerVDFN package, which is footprint-compatible with the FDMS9409-F085. Both parts are surface mount devices with identical package designations. Electrical parameters (40V Vdss, 40A continuous drain current, 2.8mOhm Rds On) are within acceptable substitution limits. Verify gate drive voltage compatibility in your circuit design, as Vgs(th) differs (2V vs. 4V).

Q: Why do some substitute parts have higher continuous drain current ratings than the FDMS9409-F085?

A: Substitute parts with 90A to 102A continuous drain current ratings (IPC100N04S52R8ATMA1, IPC90N04S5L3R3ATMA1, NVMFS5C450NAFT1G) are functionally compatible because they meet or exceed the 40V voltage specification and deliver superior thermal performance. Higher current capability does not prevent substitution; it provides design margin and improved thermal characteristics. These parts are suitable for applications where the FDMS9409-F085 was used at or below 65A continuous drain current.

Q: What is the significance of "Not For New Designs" product status?

A: Parts marked "Not For New Designs" (IPC100N04S52R8ATMA1, IPC90N04S5L3R3ATMA1) are mature products with limited manufacturing roadmap support. These parts remain available for existing design support and replacement applications but are not recommended for new product development. For new designs, select from Tier 1 parts with "Active" product status (IPZ40N04S5L2R8ATMA1, IPZ40N04S53R1ATMA1, NVMFS5C450NAFT1G).

Q: How does gate charge (Qg) affect substitution compatibility?

A: Gate charge influences gate drive circuit design and switching speed. The FDMS9409-F085 has 62nC gate charge at 10V. Substitute parts range from 23nC to 52nC. Lower gate charge reduces gate drive power dissipation and enables faster switching. Higher gate charge requires proportionally more gate drive current. Verify that your gate drive circuit can supply adequate current for the selected substitute part's gate charge specification.

Q: Are all substitute parts RoHS3 and REACH compliant?

A: All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the FDMS9409-F085 regulatory status. This ensures compatibility with environmental and hazardous substance regulations across automotive and industrial applications.

Q: What is the difference between 8-PowerVDFN and 8-PowerTDFN packages?

A: Both 8-PowerVDFN and 8-PowerTDFN are surface mount power packages with 8 leads. The primary difference is thermal pad design and lead frame geometry. Parts specified as 8-PowerVDFN (FDMS9409-F085, IPZ40N04S5L2R8ATMA1, IPZ40N04S53R1ATMA1) have identical footprints and are directly interchangeable. Parts specified as 8-PowerTDFN (IPC100N04S52R8ATMA1, IPC90N04S5L3R3ATMA1, BSZ028N04LSATMA1, RS1G260MNTB) have similar but slightly different thermal pad configurations. Verify PCB layout compatibility before substitution.

Q: Why is NVMFS5C450NAFT1G listed as 8-PowerTDFN with 5 Leads?

A: NVMFS5C450NAFT1G uses a 5-lead variant of the 8-PowerTDFN package. This configuration reduces lead count while maintaining thermal performance through an enlarged thermal pad. Verify that your PCB layout accommodates the 5-lead configuration before selecting this part.

Q: Can I use RS1G260MNTB as a substitute if my application operates above 150°C?

A: No. RS1G260MNTB is rated for maximum 150°C operating temperature, while FDMS9409-F085 supports -55°C to 175°C. If your application requires operation above 150°C, select substitute parts with -55°C to 175°C operating range: IPZ40N04S5L2R8ATMA1, IPZ40N04S53R1ATMA1, IPC100N04S52R8ATMA1, IPC90N04S5L3R3ATMA1, or NVMFS5C450NAFT1G.

Q: What is the inventory status of recommended substitute parts?

A: IPZ40N04S5L2R8ATMA1 has the highest inventory availability at 373,255 units. NVMFS5C450NAFT1G has 1,490 units. IPC90N04S5L3R3ATMA1 has 15,566 units. IPC100N04S52R8ATMA1 has 3,400 units. IPZ40N04S53R1ATMA1 has 8,382 units. All substitute parts are available in new original condition.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message