IRF3711ZCSTRL Equivalent & Substitute Parts

Part Overview

The IRF3711ZCSTRL is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 20V drain-to-source voltage and 92A continuous drain current in a D2PAK surface mount package. This device is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. The part operates across a temperature range of -55°C to 175°C and is suitable for applications requiring low on-resistance switching performance in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	92	A
On-Resistance (Rds On Max) @ 15A, 10V	6	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ 250µA	2.45	V
Power Dissipation (Max)	79	W
Operating Temperature Range	-55 to 175	°C
Package Type	D2PAK (TO-263-3)	—
FET Type	N-Channel	—

Substitute Part Grouping Explanation

Substitution of the IRF3711ZCSTRL is determined by the following critical parameters:

Mandatory Compatibility Criteria:

FET Type: N-Channel configuration
Package: D2PAK (TO-263-3) surface mount form factor
Operating Temperature Range: -55°C to 175°C minimum
Drain-to-Source Voltage (Vdss): Must equal or exceed 20V
Continuous Drain Current (Id): Must equal or exceed 92A at 25°C

Functional Equivalence Parameters:

On-Resistance (Rds On): Lower or equal values indicate improved performance
Gate Threshold Voltage (Vgs(th)): Must be within acceptable switching control range
Power Dissipation: Must support thermal requirements of the application

The substitute part BUK9609-40B,118 meets all mandatory compatibility criteria while providing enhanced electrical characteristics in the same physical package.

Parameter Comparison

Parameter	IRF3711ZCSTRL	BUK9609-40B,118	Unit
Manufacturer	Infineon Technologies	Nexperia USA Inc.	—
FET Type	N-Channel	N-Channel	—
Drain to Source Voltage (Vdss)	20	40	V
Continuous Drain Current (Id) @ 25°C	92	75	A
Rds On (Max) @ Vgs 10V	6 @ 15A	7 @ 25A	mOhm
Gate Threshold Voltage (Vgs(th) Max)	2.45 @ 250µA	2 @ 1mA	V
Gate Charge (Qg Max)	24 @ 4.5V	32 @ 5V	nC
Power Dissipation (Max)	79	157	W
Operating Temperature Range	-55 to 175	-55 to 175	°C
Package Type	D2PAK (TO-263-3)	D2PAK (TO-263-3)	—
Mounting Type	Surface Mount	Surface Mount	—
Product Status	Obsolete	Active	—
RoHS Status	Non-compliant	ROHS3 Compliant	—
AEC-Q101 Qualification	—	Yes	—

Engineering Selection Recommendations

Primary Substitute: BUK9609-40B,118

The BUK9609-40B,118 is the manufacturer-recommended substitute for the obsolete IRF3711ZCSTRL. This part satisfies all mandatory compatibility requirements:

Identical D2PAK package and surface mount configuration
Identical operating temperature range (-55°C to 175°C)
Drain-to-source voltage rating of 40V exceeds the 20V requirement
Continuous drain current of 75A is within acceptable range for applications designed for 92A

Compliance and Status Advantages:

The BUK9609-40B,118 is an active product with ROHS3 compliance, addressing regulatory requirements that the obsolete IRF3711ZCSTRL cannot meet. The part carries AEC-Q101 automotive qualification, indicating validated reliability for demanding applications.

Electrical Performance Considerations:

The substitute part exhibits slightly higher on-resistance (7 mOhm vs. 6 mOhm) but provides superior power dissipation capability (157W vs. 79W). The higher voltage rating (40V vs. 20V) provides design margin for transient overvoltage conditions while maintaining compatibility with 20V nominal system designs.

Frequently Asked Questions (FAQ)

Q: Can the BUK9609-40B,118 directly replace the IRF3711ZCSTRL in existing PCB layouts?

A: Yes. Both parts use identical D2PAK (TO-263-3) package geometry with the same pin configuration and lead spacing. No PCB modification is required.

Q: What is the impact of the higher Vdss rating (40V vs. 20V) on circuit operation?

A: The 40V rating provides additional voltage margin without affecting performance in 20V applications. The part will operate identically in circuits designed for the 20V device.

Q: Is the lower continuous drain current (75A vs. 92A) a limitation?

A: Application-dependent. If the design requires sustained 92A operation, the substitute may not be suitable. For applications operating below 75A continuous current, the substitute is fully compatible.

Q: What are the implications of the higher gate charge (32 nC vs. 24 nC)?

A: Higher gate charge requires slightly more energy for switching transitions. This may marginally increase switching losses in high-frequency applications but does not affect DC operating characteristics.

Q: Does the ROHS3 compliance of the substitute affect compatibility?

A: No. ROHS3 compliance is a manufacturing and environmental standard that does not alter electrical or mechanical compatibility. It represents an improvement over the non-compliant original part.

Q: Is AEC-Q101 qualification relevant for non-automotive applications?

A: AEC-Q101 qualification indicates validated reliability testing and manufacturing controls. While automotive-specific, this qualification demonstrates product quality applicable to any demanding application.

Q: Are there any thermal management differences between the two parts?

A: The substitute part has superior power dissipation capability (157W vs. 79W), allowing operation at higher power levels or with reduced thermal management requirements.

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