IRF3709ZCS N-Channel 30V 87A MOSFET Equivalent & Substitute Parts

Part Overview

The IRF3709ZCS is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage with 87A continuous drain current at 25°C. This device is housed in a D2PAK surface mount package and is part of the HEXFET® series. The IRF3709ZCS is classified as obsolete, making identification of functionally equivalent substitute components essential for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain compatibility across electrical ratings, thermal characteristics, and mechanical packaging to ensure direct replacement capability.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	87	A (Tc)
On-State Resistance (Rds On Max) @ 21A, 10V	6.3	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ 250µA	2.25	V
Power Dissipation (Max)	79	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (TO-263-3)	Surface Mount
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitute parts for the IRF3709ZCS are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Mandatory Compatibility Criteria:

Drain-to-Source Voltage (Vdss): 30V (exact match required)
Package Type: D2PAK surface mount (TO-263-3)
FET Type: N-Channel
Technology: MOSFET (Metal Oxide)
Operating Temperature Range: -55°C to 175°C (TJ)
Mounting Type: Surface Mount

Performance Parameters (allowable variation):

Continuous Drain Current (Id): Substitute must meet or exceed 87A at 25°C for direct replacement
On-State Resistance (Rds On): Lower values indicate improved performance
Power Dissipation: Higher ratings provide thermal margin
Gate Charge (Qg): Lower values reduce switching losses

The two substitute parts listed below satisfy all mandatory criteria and are presented in two distinct performance categories based on current rating and thermal characteristics.

Parameter Comparison

Parameter	IRF3709ZCS (Main)	PSMN4R3-30BL,118 (Substitute)	PSMN017-30BL,118 (Substitute)
Manufacturer	Infineon Technologies	Nexperia USA Inc.	Nexperia USA Inc.
Drain to Source Voltage (Vdss)	30 V	30 V	30 V
Continuous Drain Current (Id) @ 25°C	87 A (Tc)	100 A (Tc)	32 A (Tc)
Rds On (Max) @ 10V	6.3 mOhm @ 21A	4.1 mOhm @ 15A	17 mOhm @ 10A
Gate Threshold Voltage (Vgs(th) Max)	2.25 V @ 250µA	2.15 V @ 1mA	2.15 V @ 1mA
Gate Charge (Qg) (Max)	26 nC @ 4.5 V	41.5 nC @ 10 V	10.7 nC @ 10 V
Input Capacitance (Ciss) (Max)	2130 pF @ 15 V	2400 pF @ 15 V	552 pF @ 15 V
Power Dissipation (Max)	79 W (Tc)	103 W (Tc)	47 W (Tc)
Operating Temperature	-55 to 175 °C (TJ)	-55 to 175 °C (TJ)	-55 to 175 °C (TJ)
Package / Case	TO-263-3, D2PAK	TO-263-3, D2PAK	TO-263-3, D2PAK
Product Status	Obsolete	Active	Obsolete
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

PSMN4R3-30BL,118 (Primary Substitute for Performance-Critical Applications)

The PSMN4R3-30BL,118 is the preferred substitute when the IRF3709ZCS cannot be sourced. This part exceeds the current rating of the original device (100A vs. 87A) and delivers superior on-state resistance (4.1 mOhm vs. 6.3 mOhm), resulting in lower conduction losses and reduced thermal dissipation. The higher power dissipation rating (103W vs. 79W) provides additional thermal margin. The PSMN4R3-30BL,118 is classified as Active product status, ensuring long-term availability and supply chain stability. This part is ROHS3 compliant, meeting modern environmental and regulatory requirements. The higher gate charge (41.5 nC) and input capacitance (2400 pF) are within acceptable ranges for most switching applications and do not preclude direct substitution.

PSMN017-30BL,118 (Secondary Substitute for Current-Limited Applications)

The PSMN017-30BL,118 is suitable for applications where the 87A continuous drain current of the original device is not fully utilized or where design margins permit operation at reduced current levels. This part is rated for 32A continuous drain current, which is below the IRF3709ZCS specification. The PSMN017-30BL,118 offers significantly lower gate charge (10.7 nC) and input capacitance (552 pF), advantageous for high-frequency switching applications with reduced driver power requirements. This part is ROHS3 compliant. The PSMN017-30BL,118 is classified as Obsolete, limiting its suitability for new long-term production designs.

Compliance and Regulatory Considerations

Both substitute parts are ROHS3 compliant, whereas the original IRF3709ZCS is RoHS non-compliant. This compliance upgrade is beneficial for applications subject to environmental regulations. Both substitutes maintain REACH Unaffected status and EAR99 export classification, consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can the PSMN4R3-30BL,118 be used as a direct replacement for the IRF3709ZCS in all applications?

A: The PSMN4R3-30BL,118 meets all mandatory electrical and mechanical compatibility criteria for direct substitution. The higher current rating (100A vs. 87A) and lower on-state resistance (4.1 mOhm vs. 6.3 mOhm) represent performance improvements. The increased gate charge and input capacitance are within acceptable ranges for standard switching applications. Verification of gate driver capability is recommended for high-frequency switching circuits operating above 500 kHz.

Q: Is the PSMN017-30BL,118 a suitable substitute for the IRF3709ZCS?

A: The PSMN017-30BL,118 shares the same 30V voltage rating and D2PAK package as the IRF3709ZCS. However, its continuous drain current rating of 32A is significantly lower than the original 87A specification. This part is suitable only for applications where the actual operating current does not exceed 32A. The lower gate charge and input capacitance may provide switching efficiency benefits in low-current designs.

Q: What are the key differences between the two substitute parts?

A: The PSMN4R3-30BL,118 is optimized for high-current applications with superior on-state resistance and higher power dissipation capability. The PSMN017-30BL,118 is optimized for low-current, high-frequency applications with minimal gate charge and input capacitance. The PSMN4R3-30BL,118 is Active product status, while the PSMN017-30BL,118 is Obsolete.

Q: Are there any thermal management differences between the IRF3709ZCS and its substitutes?

A: The PSMN4R3-30BL,118 has a higher power dissipation rating (103W vs. 79W) and lower on-state resistance, resulting in reduced junction temperature under identical operating conditions. The PSMN017-30BL,118 has a lower power dissipation rating (47W vs. 79W) due to its reduced current capability. All three parts operate across the same temperature range (-55°C to 175°C TJ).

Q: Do the substitute parts require different PCB layout or thermal management considerations?

A: All three parts use identical D2PAK packaging (TO-263-3), requiring no changes to PCB footprint or thermal interface design. The tab connection and lead spacing are identical. Thermal management strategies remain consistent across all three parts.

Q: What is the impact of higher gate charge in the PSMN4R3-30BL,118?

A: The PSMN4R3-30BL,118 has a gate charge of 41.5 nC compared to 26 nC in the IRF3709ZCS. This requires slightly higher gate driver current or longer switching times. For applications with switching frequencies below 1 MHz and adequate gate driver capability, this difference is not significant. High-frequency applications (above 1 MHz) should verify gate driver specifications.

Q: Are both substitute parts available in the same packaging options as the original?

A: Both substitute parts are supplied in D2PAK surface mount packages (TO-263-3), identical to the IRF3709ZCS. The PSMN4R3-30BL,118 and PSMN017-30BL,118 are available in Tape & Reel (TR) packaging for automated assembly.

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