IRLR3717PBF N-Channel MOSFET 20V 120A Equivalent & Substitute Parts

Part Overview

The IRLR3717PBF is an N-Channel MOSFET manufactured by Infineon Technologies, part of the HEXFET® series. This device is rated for 20V drain-to-source voltage with 120A continuous drain current at 25°C case temperature and 89W maximum power dissipation. The component is housed in a TO-252AA (DPAK) surface mount package.

The IRLR3717PBF is currently discontinued at DiGi Electronics. Equivalent and substitute parts must be identified to support ongoing production and maintenance requirements. Substitution is based on matching electrical performance parameters, package compatibility, and thermal characteristics within the constraints of the N-Channel MOSFET category.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	120	A (Tc)
On-Resistance (Rds On) @ 15A, 10V	4	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.45	V
Power Dissipation (Max)	89	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 (DPAK)	Surface Mount
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the IRLR3717PBF is determined by the following electrical and mechanical criteria:

Primary Matching Criteria:

Drain-to-Source Voltage (Vdss): 20V minimum
Continuous Drain Current (Id): 120A or greater at 25°C case temperature
On-Resistance (Rds On): Comparable or lower at specified gate voltage
Package Type: TO-252 (DPAK) or compatible surface mount package
Operating Temperature Range: -55°C to 175°C minimum
RoHS3 Compliance and REACH Unaffected status

Substitution Logic: Parts are grouped into two categories based on voltage rating and current handling:

Category A – Direct Voltage Match (20V Vdss): Parts with 20V Vdss rating that maintain 120A continuous drain current capability. These provide the closest electrical equivalence.

Category B – Elevated Voltage Rating (30V Vdss): Parts with 30V Vdss rating that exceed the original 20V specification. These are suitable for applications where higher voltage margin is acceptable and do not create circuit incompatibility, as they operate within the same gate voltage and package constraints.

Parameter Comparison

Parameter	IRLR3717PBF	AOD424	STB200NF03T4	STD150N3LLH6	STD17NF03LT4	STD86N3LH5
Manufacturer	Infineon	Alpha & Omega	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Vdss (V)	20	20	30	30	30	30
Id @ 25°C (A)	120 (Tc)	45 (Tc)	120 (Tc)	80 (Tc)	17 (Tc)	80 (Tc)
Rds On (mOhm)	4 @ 15A, 10V	4.4 @ 20A, 4.5V	3.6 @ 60A, 10V	2.8 @ 40A, 10V	50 @ 8.5A, 10V	5 @ 40A, 10V
Vgs(th) (V)	2.45 @ 250µA	1.6 @ 250µA	4 @ 250µA	2.5 @ 250µA	2.2 @ 250µA	2.5 @ 250µA
Power Dissipation (W)	89 (Tc)	100 (Tc)	300 (Tc)	110 (Tc)	30 (Tc)	70 (Tc)
Operating Temp (°C)	-55 to 175	-55 to 175	-55 to 175	to 175	-55 to 175	to 175
Package	TO-252 (DPAK)	TO-252 (DPAK)	D2PAK	TO-252 (DPAK)	TO-252 (DPAK)	TO-252 (DPAK)
Product Status	Discontinued	Active	Active	Obsolete	Active	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

AOD424 (Alpha & Omega Semiconductor Inc.)

The AOD424 matches the IRLR3717PBF in voltage rating (20V Vdss) and package type (TO-252 DPAK). Current rating is 45A (Tc), which is lower than the original 120A specification. This part is suitable for applications requiring lower current handling. Product status is Active with full RoHS3 compliance. Inventory availability is 17,638 pieces.

STB200NF03T4 (STMicroelectronics)

The STB200NF03T4 provides 120A continuous drain current matching the original specification, with elevated voltage rating of 30V Vdss. Package is D2PAK (TO-263-3), which differs from the original TO-252 DPAK. This part is suitable for applications where higher voltage margin is required and PCB layout can accommodate D2PAK footprint. Product status is Active. Power dissipation capability is 300W (Tc), exceeding the original 89W. Inventory availability is 10,292 pieces.

STD150N3LLH6 (STMicroelectronics)

The STD150N3LLH6 provides 80A continuous drain current with 30V Vdss rating in TO-252 DPAK package. This part is suitable for applications where current requirement is between 80A and 120A and higher voltage margin is acceptable. Product status is Obsolete. Inventory availability is 10,300 pieces.

STD17NF03LT4 (STMicroelectronics)

The STD17NF03LT4 provides 17A continuous drain current with 30V Vdss rating in TO-252 DPAK package. This part is suitable only for low-current applications and does not meet the 120A requirement of the original specification. Product status is Active. Inventory availability is 8,694 pieces.

STD86N3LH5 (STMicroelectronics)

The STD86N3LH5 provides 80A continuous drain current with 30V Vdss rating in TO-252 DPAK package. This part is suitable for applications where current requirement is between 80A and 120A and higher voltage margin is acceptable. Product status is Active with AEC-Q101 automotive qualification. Inventory availability is 18,895 pieces.

Frequently Asked Questions (FAQ)

Q: Can AOD424 replace IRLR3717PBF in all applications?

A: AOD424 has the same 20V Vdss rating and TO-252 DPAK package, but provides only 45A continuous drain current compared to the original 120A. Substitution is valid only for applications where the actual drain current requirement does not exceed 45A at 25°C case temperature.

Q: What is the difference between TO-252 DPAK and D2PAK packages?

A: TO-252 DPAK (SC-63) and D2PAK (TO-263-3) are both surface mount packages with 2 leads plus tab, but have different physical dimensions and PCB footprints. D2PAK provides larger tab area for improved thermal dissipation. STB200NF03T4 uses D2PAK and requires PCB layout modification compared to the original TO-252 DPAK footprint.

Q: Why do some substitutes have 30V Vdss instead of 20V?

A: Parts with 30V Vdss rating provide higher voltage margin and are electrically compatible in circuits designed for 20V operation. The higher voltage rating does not create incompatibility; it simply provides additional safety margin. Gate drive voltage and current handling characteristics remain compatible with the original design.

Q: Is STD150N3LLH6 suitable for replacement despite Obsolete status?

A: STD150N3LLH6 is marked Obsolete but has 10,300 pieces in current inventory. It provides 80A continuous drain current in TO-252 DPAK package with 30V Vdss. Substitution is valid for applications where 80A current capacity is sufficient. Long-term availability cannot be guaranteed due to obsolete status.

Q: What is the significance of RoHS3 compliance and REACH Unaffected status?

A: All listed substitute parts maintain RoHS3 compliance and REACH Unaffected status, matching the environmental and regulatory requirements of the original IRLR3717PBF. This ensures compatibility with procurement specifications and regulatory requirements for the end application.

Q: Can STD17NF03LT4 be used as a substitute?

A: STD17NF03LT4 provides only 17A continuous drain current, which is significantly lower than the original 120A specification. This part is not suitable as a general substitute for IRLR3717PBF. It may be used only in applications where the actual drain current requirement is 17A or lower.

Q: Which substitute provides the closest electrical match to IRLR3717PBF?

A: STB200NF03T4 provides the closest current rating match at 120A continuous drain current. However, it uses D2PAK package instead of TO-252 DPAK, requiring PCB layout modification. AOD424 provides exact package and voltage match but with reduced current rating of 45A.

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