IRFR3709Z N-Channel 30V 86A MOSFET Equivalent & Substitute Parts

Part Overview

The IRFR3709Z is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage and 86A continuous drain current in a Surface Mount TO-252AA (DPAK) package. This device is classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing production and maintenance applications. The HEXFET® series device provides 79W maximum power dissipation and operates across the temperature range of -55°C to 175°C.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	86	A (Tc)
On-State Resistance (Rds On) @ 15A, 10V	6.5	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.25	V
Gate Charge (Qg) @ 4.5V	26	nC
Power Dissipation (Max)	79	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 (DPAK)	Surface Mount
Input Capacitance (Ciss) @ 15V	2330	pF

Substitute Part Grouping Explanation

Substitution of the IRFR3709Z is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
Continuous Drain Current (Id): Must support minimum 86A at Tc
On-State Resistance (Rds On): Must not exceed 6.5mOhm @ specified test conditions
Package Type: Must be TO-252-3 (DPAK) Surface Mount
Operating Temperature Range: Must span -55°C to 175°C minimum
Gate Threshold Voltage (Vgs(th)): Must be compatible with 2.25V specification
Maximum Gate Voltage (Vgs): Must support ±20V operation

Substitute Categories:

Category 1 - Direct Electrical Equivalents (Same Vdss, Same or Higher Id): Parts maintaining 30V Vdss rating with 86A or greater continuous drain current capability.

Category 2 - Functional Alternatives (Same Vdss, Reduced Id): Parts rated for 30V Vdss with lower continuous drain current (50A range) suitable for applications not requiring full 86A capacity.

Category 3 - Higher Voltage Alternatives (Elevated Vdss): Parts rated for 40V Vdss with comparable current ratings, applicable where voltage margin is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Power Diss. (W)	Temp Range (°C)	Package	Status
IRFR3709Z	Infineon	30	86 (Tc)	6.5 @ 15A, 10V	2.25 @ 250µA	26 @ 4.5V	79 (Tc)	-55 to 175	TO-252-3 (DPAK)	Obsolete
IRFR3709ZTRPBF	Infineon	30	86 (Tc)	6.5 @ 15A, 10V	2.25 @ 250µA	26 @ 4.5V	79 (Tc)	-55 to 175	TO-252-3 (DPAK)	Not For New Designs
IPD50N03S2L06ATMA1	Infineon	30	50 (Tc)	6.4 @ 50A, 10V	2 @ 85µA	68 @ 10V	136 (Tc)	-55 to 175	TO-252-3 (DPAK)	Active
IPD50N03S207ATMA1	Infineon	30	50 (Tc)	7.3 @ 50A, 10V	4 @ 85µA	68 @ 10V	136 (Tc)	-55 to 175	TO-252-3 (DPAK)	Active
STD100N3LF3	STMicroelectronics	30	80 (Tc)	5.5 @ 40A, 10V	2.5 @ 250µA	27 @ 5V	110 (Tc)	-55 to 175	TO-252-3 (DPAK)	Obsolete
STD95N4LF3	STMicroelectronics	40	80 (Tc)	6 @ 40A, 10V	2.5 @ 250µA	70 @ 10V	110 (Tc)	-55 to 175	TO-252-3 (DPAK)	Active
FDD6670A	onsemi	30	66 (Tc)	8 @ 15A, 10V	3 @ 250µA	22 @ 5V	63 (Tc)	-55 to 175	TO-252-3 (DPAK)	Last Time Buy
FDD8896	Fairchild Semiconductor	30	94 (Tc)	5.7 @ 35A, 10V	2.5 @ 250µA	60 @ 10V	80 (Tc)	-55 to 175	TO-252-3 (DPAK)	Active
DMG8880LK3-13	Diodes Incorporated	30	11 (Ta)	7.5 @ 11.6A, 10V	2.3 @ 250µA	27.6 @ 10V	1.68 (Ta)	-55 to 150	TO-252-3 (DPAK)	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

IRFR3709ZTRPBF is the direct equivalent of IRFR3709Z, maintaining identical electrical specifications including 30V Vdss, 86A continuous drain current, and 6.5mOhm on-state resistance. This part is available in Cut Tape and Digi-Reel packaging with 1300 pieces in stock. Product status is "Not For New Designs," indicating limited future availability.

For Active Production (Recommended for New Designs):

FDD8896 (Fairchild Semiconductor) provides superior electrical performance with 94A continuous drain current and 5.7mOhm on-state resistance at 35A, 10V, exceeding IRFR3709Z specifications while maintaining 30V Vdss and TO-252-3 package compatibility. Operating temperature range spans -55°C to 175°C. Product status is Active with 43200 pieces in stock.

For Automotive Applications:

IPD50N03S2L06ATMA1 (Infineon OptiMOS™) is qualified to AEC-Q101 automotive standard with ROHS3 compliance. While rated for 50A continuous drain current (below the 86A specification), this part provides 6.4mOhm on-state resistance and 136W power dissipation in the same TO-252-3 package. Suitable for applications where 50A capacity is sufficient.

For High-Current Applications Requiring Active Status:

STD100N3LF3 (STMicroelectronics STripFET™ II) delivers 80A continuous drain current with 5.5mOhm on-state resistance at 40A, 10V, and 110W power dissipation. Maintains 30V Vdss and TO-252-3 package. Product status is Obsolete; however, 15465 pieces are in stock.

For Elevated Voltage Margin:

STD95N4LF3 (STMicroelectronics STripFET™ III) provides 40V Vdss rating with 80A continuous drain current and 6mOhm on-state resistance. Product status is Active with 5210 pieces in stock. Suitable where voltage headroom above 30V is required.

For Reduced Current Applications:

IPD50N03S207ATMA1 (Infineon OptiMOS™) rated for 50A continuous drain current with 7.3mOhm on-state resistance. Active product status with 47600 pieces in stock. Applicable where full 86A capacity is not required.

Frequently Asked Questions (FAQ)

Q: Can IRFR3709ZTRPBF be used as a direct replacement for IRFR3709Z?

A: Yes. IRFR3709ZTRPBF is electrically identical to IRFR3709Z, with matching 30V Vdss, 86A continuous drain current, 6.5mOhm on-state resistance, and TO-252-3 package. The difference is packaging format (Cut Tape & Digi-Reel vs. standard packaging) and product status designation. Both are Infineon HEXFET® devices with identical electrical performance.

Q: What is the primary limitation when substituting with IPD50N03S2L06ATMA1?

A: The IPD50N03S2L06ATMA1 is rated for 50A continuous drain current, compared to the IRFR3709Z specification of 86A. This part is suitable only for applications where the required continuous drain current does not exceed 50A. All other electrical parameters (30V Vdss, operating temperature range, package type) are compatible.

Q: Why is FDD8896 recommended for new designs despite higher gate charge?

A: FDD8896 maintains 30V Vdss and TO-252-3 package compatibility while providing 94A continuous drain current (exceeding the 86A requirement) and superior on-state resistance of 5.7mOhm at 35A, 10V. The higher gate charge of 60nC at 10V is offset by improved current handling and Active product status with substantial inventory. This part is suitable for new designs requiring long-term availability.

Q: Is DMG8880LK3-13 suitable as a substitute?

A: DMG8880LK3-13 is not suitable as a direct substitute. While it maintains 30V Vdss and TO-252-3 package compatibility, it is rated for only 11A continuous drain current (Ta), significantly below the 86A requirement. This part is applicable only for low-current applications and does not meet the electrical performance criteria of the IRFR3709Z.

Q: What compliance advantages does IPD50N03S2L06ATMA1 offer?

A: IPD50N03S2L06ATMA1 carries AEC-Q101 automotive qualification and ROHS3 compliance, making it suitable for automotive and regulated applications. IRFR3709Z is RoHS non-compliant. This part is recommended for applications requiring automotive-grade components.

Q: Can STD95N4LF3 be used in circuits designed for 30V operation?

A: Yes. STD95N4LF3 is rated for 40V Vdss, which exceeds the 30V requirement. The higher voltage rating provides additional safety margin and does not create compatibility issues in 30V circuits. The part maintains 80A continuous drain current, 6mOhm on-state resistance, and TO-252-3 package compatibility. Product status is Active.

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

A: Tc (case temperature) ratings reflect continuous drain current at the device case temperature, typically representing sustained operation. Ta (ambient temperature) ratings reflect continuous drain current at ambient temperature, typically more conservative. IRFR3709Z specifies 86A (Tc), while DMG8880LK3-13 specifies 11A (Ta), indicating different measurement conditions and thermal assumptions.

Q: Are all substitute parts available in the same packaging format?

A: All listed substitute parts use TO-252-3 (DPAK) Surface Mount package, ensuring mechanical and thermal compatibility. Packaging format variations (Cut Tape, Digi-Reel, Tape & Reel) do not affect electrical performance or board-level compatibility.

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

A: FDD8896 provides the lowest on-state resistance at 5.7mOhm (measured at 35A, 10V), followed by STD100N3LF3 at 5.5mOhm (measured at 40A, 10V). Lower on-state resistance reduces power dissipation and heat generation during operation.

Q: What inventory status should influence substitution decisions?

A: IRFR3709Z (2262 pieces) and IRFR3709ZTRPBF (1300 pieces) have limited stock. For long-term production, FDD8896 (43200 pieces), IPD50N03S207ATMA1 (47600 pieces), and FDD6670A (43200 pieces) offer substantially higher inventory levels. Product status (Active vs. Obsolete vs. Last Time Buy) should guide selection for ongoing production requirements.

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