FDB8441 N-Channel MOSFET 40V 28A/120A TO-263 Equivalent & Substitute Parts

Part Overview

The FDB8441 is an N-Channel MOSFET manufactured by onsemi, rated for 40V drain-to-source voltage with continuous drain current of 28A (Ta) and 120A (Tc). This device is housed in a TO-263 (D2PAK) surface mount package and is part of the PowerTrench® series. The FDB8441 is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current @ 25°C (Tc)	120	A
Continuous Drain Current @ 25°C (Ta)	28	A
Power Dissipation (Max)	300	W
RDS(on) @ 80A, 10V	2.5	mOhm
Gate Charge @ 10V	280	nC
Operating Temperature Range	-55 to 175	°C
Package Type	TO-263 (D2PAK)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the FDB8441 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Drain-to-Source Voltage (Vdss): Must equal 40V
Package Type: Must be TO-263 (D2PAK) or compatible surface mount variant
Mounting Type: Must be Surface Mount
FET Type: Must be N-Channel
Technology: Must be MOSFET (Metal Oxide)
Operating Temperature Range: Must support -55°C to 175°C minimum
Gate-Source Voltage (Vgs Max): Must support ±20V
RoHS Compliance: Must be ROHS3 Compliant

Performance Parameters for Substitution Consideration:

Continuous Drain Current (Tc): Substitute must meet or exceed 120A
Power Dissipation: Substitute must meet or exceed 300W
RDS(on): Lower values indicate improved performance
Gate Charge: Lower values reduce switching losses

All substitute parts listed meet the critical matching parameters. Performance parameters determine suitability for specific application requirements.

Parameter Comparison

Parameter	FDB8441 (onsemi)	STB170NF04 (STMicroelectronics)	IXTA300N04T2 (IXYS)	PSMN2R2-40BS,118 (Nexperia)	STB270N4F3 (STMicroelectronics)
Vdss	40V	40V	40V	40V	40V
Continuous Drain Current (Tc)	120A	80A	300A	100A	160A
Power Dissipation (Max)	300W	300W	480W	306W	330W
RDS(on) @ 10V	2.5 mOhm @ 80A	5 mOhm @ 40A	2.5 mOhm @ 500mA	2.2 mOhm @ 25A	2.5 mOhm @ 80A
Gate Charge @ 10V	280 nC	170 nC	145 nC	130 nC	150 nC
Vgs(th) @ 250µA	4V	4V	4V	4V	4V
Vgs (Max)	±20V	±20V	±20V	±20V	±20V
Operating Temperature	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package	TO-263 (D2PAK)	TO-263 (D2PAK)	TO-263AA	D2PAK	D2PAK
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STB170NF04 (STMicroelectronics)

The STB170NF04 is an active product with full ROHS3 compliance and REACH unaffected status. This device provides 80A continuous drain current at case temperature, which is below the FDB8441 specification of 120A. The STB170NF04 is suitable for applications where the required drain current does not exceed 80A. Gate charge is reduced to 170 nC, offering lower switching losses compared to the FDB8441. This part is available in high volume (26,220 pcs in stock) and is part of the STripFET™ II series.

IXTA300N04T2 (IXYS)

The IXTA300N04T2 is an active product with full ROHS3 compliance and REACH unaffected status. This device provides 300A continuous drain current at case temperature, significantly exceeding the FDB8441 specification. Power dissipation is rated at 480W, also exceeding the original part. The IXTA300N04T2 is suitable for applications requiring higher current handling or thermal performance. Gate charge is reduced to 145 nC. This part is available in moderate volume (858 pcs in stock) and is part of the TrenchT2™ series.

PSMN2R2-40BS,118 (Nexperia USA Inc.)

The PSMN2R2-40BS,118 is an active product with full ROHS3 compliance and REACH unaffected status. This device provides 100A continuous drain current at case temperature, which is below the FDB8441 specification of 120A but closer than the STB170NF04. Power dissipation is rated at 306W, slightly exceeding the original part. RDS(on) is 2.2 mOhm at 25A, representing the lowest on-resistance among all substitutes. Gate charge is reduced to 130 nC. This part is available in limited volume (632 pcs in stock).

STB270N4F3 (STMicroelectronics)

The STB270N4F3 is an active product with full ROHS3 compliance and REACH unaffected status. This device provides 160A continuous drain current at case temperature, exceeding the FDB8441 specification of 120A. Power dissipation is rated at 330W, exceeding the original part. RDS(on) is 2.5 mOhm at 80A, matching the FDB8441 specification. Gate charge is reduced to 150 nC. This part is available in high volume (7,230 pcs in stock) and is part of the STripFET™ III series. The STB270N4F3 carries AEC-Q101 automotive qualification, suitable for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can the FDB8441 be directly replaced with any of these substitute parts?

A: Direct replacement is possible only if the application requirements do not exceed the electrical specifications of the substitute part. All listed substitutes share the same 40V Vdss rating, TO-263/D2PAK package type, and surface mount configuration. However, continuous drain current ratings differ. Applications requiring 120A must use either the IXTA300N04T2 (300A) or STB270N4F3 (160A). Applications requiring less than 80A can use the STB170NF04.

Q: What is the significance of the different drain current ratings?

A: Continuous drain current (Tc) represents the maximum current the device can conduct continuously at case temperature without exceeding thermal limits. The FDB8441 is rated for 120A (Tc). Substitutes with lower ratings (STB170NF04 at 80A, PSMN2R2-40BS,118 at 100A) are suitable only for applications with lower current requirements. Substitutes with higher ratings (IXTA300N04T2 at 300A, STB270N4F3 at 160A) provide additional margin and are suitable for all applications within the 40V Vdss class.

Q: How do gate charge differences affect circuit performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. The FDB8441 has a gate charge of 280 nC at 10V. All substitute parts have lower gate charge values (130 to 170 nC), resulting in reduced switching losses and potentially faster switching speeds. This is a performance improvement that does not affect compatibility.

Q: Are all substitute parts available in the same package?

A: All substitute parts use TO-263 or D2PAK package variants, which are mechanically and electrically compatible. The FDB8441 uses TO-263-3 (D2PAK with 2 leads + tab). The IXTA300N04T2 uses TO-263AA, which is a variant of the same package family. All parts are surface mount devices with identical pin configurations for this package type.

Q: What is the difference between Ta and Tc current ratings?

A: Ta represents continuous drain current at ambient temperature (typically 25°C), while Tc represents continuous drain current at case temperature. The FDB8441 specifies 28A (Ta) and 120A (Tc). The Tc rating is the more practical specification for thermal design, as it accounts for the actual junction temperature under operating conditions. Substitute parts typically specify only the Tc rating.

Q: Can I use a substitute part with higher current rating in a design rated for the FDB8441?

A: Yes. A substitute part with a higher current rating (such as IXTA300N04T2 at 300A or STB270N4F3 at 160A) can be used in any application designed for the FDB8441. The higher current rating provides additional thermal margin and does not create compatibility issues. The circuit will operate within the electrical specifications of the substitute part.

Q: Why is the FDB8441 listed as obsolete?

A: The FDB8441 is classified as obsolete by onsemi, meaning it is no longer in active production. However, inventory remains available (2,119 pcs in stock). For new designs or long-term production, active alternatives such as STB170NF04, IXTA300N04T2, PSMN2R2-40BS,118, or STB270N4F3 are recommended to ensure supply chain continuity.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The FDB8441 is also ROHS3 compliant.

Q: Which substitute part is recommended for automotive applications?

A: The STB270N4F3 carries AEC-Q101 automotive qualification, making it the appropriate choice for automotive applications. This part provides 160A continuous drain current, exceeding the FDB8441 specification, and is available in high volume.

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