IRF3717 Equivalent & Substitute Parts

Part Overview

The IRF3717 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 20V drain-to-source voltage with 20A continuous drain current at 25°C. This device is packaged in an 8-SO surface mount configuration and is part of the HEXFET® series. The IRF3717 is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	20	V
Current - Continuous Drain (Id) @ 25°C	20	A
Rds On (Max) @ 20A, 10V	4.4	mOhm
Vgs(th) (Max) @ 250µA	2.45	V
Gate Charge (Qg) (Max) @ 4.5V	33	nC
Power Dissipation (Max)	2.5	W
Operating Temperature Range	-55 to 150	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—

Substitute Part Grouping Explanation

Substitution of the IRF3717 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

FET Type: N-Channel
Drain to Source Voltage (Vdss): 20V minimum
Continuous Drain Current (Id): 20A minimum at 25°C
Package Type: 8-SOIC surface mount with 0.154" (3.90mm) width
Operating Temperature Range: -55°C to 150°C minimum

Acceptable Variation Parameters:

Rds On (Max): Substitute must not exceed the IRF3717 specification to maintain thermal performance
Gate Charge (Qg): Substitute values may vary within application-dependent switching loss tolerances
Power Dissipation: Substitute must support thermal requirements of the application
Vgs(th): Threshold voltage must be compatible with gate drive circuitry

The AO4402 from Alpha & Omega Semiconductor Inc. meets all critical matching parameters and is identified as the manufacturer-recommended substitute.

Parameter Comparison

Parameter	IRF3717 (Infineon)	AO4402 (Alpha & Omega)	Unit
FET Type	N-Channel	N-Channel	—
Drain to Source Voltage (Vdss)	20	20	V
Current - Continuous Drain (Id) @ 25°C	20	20	A
Rds On (Max) @ 20A	4.4 @ 10V	5.5 @ 4.5V	mOhm
Vgs(th) (Max) @ 250µA	2.45	1.6	V
Gate Charge (Qg) (Max)	33 @ 4.5V	43 @ 10V	nC
Power Dissipation (Max)	2.5	3.1	W
Operating Temperature Range	-55 to 150	-55 to 150	°C
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	—
Mounting Type	Surface Mount	Surface Mount	—
Product Status	Obsolete	Not For New Designs	—
RoHS Status	RoHS non-compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

IRF3717 (Infineon): This part is classified as obsolete and carries RoHS non-compliant status. While 1307 pieces are currently in stock, procurement for new applications or long-term production is not recommended due to end-of-life status.

AO4402 (Alpha & Omega Semiconductor Inc.): This part is classified as "Not For New Designs" but maintains ROHS3 compliance and significantly higher inventory availability (180,400 pieces). The AO4402 is electrically compatible with the IRF3717 across all critical parameters and shares identical package geometry. The higher power dissipation rating (3.1W vs. 2.5W) provides additional thermal margin. Both parts are REACH Unaffected and carry EAR99 ECCN classification.

For applications currently using the IRF3717, the AO4402 provides direct functional substitution with improved regulatory compliance. Both parts are suitable for existing designs requiring component replacement or inventory replenishment.

Frequently Asked Questions (FAQ)

Q: Can the AO4402 directly replace the IRF3717 in existing PCB layouts?

A: Yes. Both devices use identical 8-SOIC packaging with 0.154" (3.90mm) width, ensuring mechanical and electrical compatibility on existing printed circuit boards without layout modification.

Q: What are the key electrical differences between these parts?

A: The AO4402 exhibits lower gate threshold voltage (1.6V vs. 2.45V) and higher on-resistance at lower gate drive voltage (5.5mOhm @ 4.5V vs. 4.4mOhm @ 10V). The AO4402 requires lower gate drive voltage for optimal performance. Gate charge is slightly higher (43nC vs. 33nC), resulting in marginally increased switching losses. Power dissipation rating is higher (3.1W vs. 2.5W).

Q: Are there compliance or regulatory differences?

A: The IRF3717 is RoHS non-compliant, while the AO4402 is ROHS3 compliant. Both parts are REACH Unaffected and carry identical EAR99 ECCN classification. For applications requiring RoHS compliance, the AO4402 is the appropriate selection.

Q: What is the significance of "Not For New Designs" status on the AO4402?

A: This designation indicates the manufacturer does not recommend this part for new product development. However, it remains available for existing design support and component replacement. Inventory availability is substantial (180,400 pieces), supporting ongoing production requirements.

Q: How do the thermal characteristics compare?

A: The AO4402 has a higher maximum power dissipation rating (3.1W vs. 2.5W), providing additional thermal headroom. On-resistance differences are application-dependent; the IRF3717 shows lower on-resistance at 10V gate drive, while the AO4402 is optimized for lower gate drive voltages (2.5V to 4.5V).

Q: Are there any gate drive circuit modifications required?

A: The AO4402 lower threshold voltage (1.6V vs. 2.45V) and optimized drive voltage range (2.5V to 4.5V vs. 4.5V to 10V) may require gate drive circuit evaluation. Existing circuits designed for the IRF3717 will function with the AO4402, but performance optimization may be achieved through gate drive voltage adjustment.

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