IRLR3717TRLPBF Equivalent & Substitute Parts

Part Overview

The IRLR3717TRLPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 20V drain-to-source voltage with 120A continuous drain current at 25°C. This device is packaged in TO-252AA (DPAK) surface mount configuration and is designed for high-current switching applications. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	20	V
Continuous Drain Current @ 25°C	120	A (Tc)
On-Resistance (Rds On) @ 15A, 10V	4	mOhm
Gate Threshold Voltage @ 250µA	2.45	V
Gate Charge @ 4.5V	31	nC
Power Dissipation (Max)	89	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 (DPAK)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the IRLR3717TRLPBF is determined by the following critical parameters:

Primary Compatibility Criteria:

Drain-to-Source Voltage (Vdss) rating must equal or exceed 20V
Continuous drain current capability must support the application requirement
On-resistance characteristics must be compatible with thermal and switching loss budgets
Package type must be TO-252 (DPAK) for mechanical and thermal compatibility
Operating temperature range must span -55°C to 175°C minimum

Substitute Classification:

The three identified substitutes fall into two distinct categories based on electrical performance:

Category A - High Current Capability (80A+): STD86N3LH5 provides current handling comparable to the original part with enhanced voltage rating (30V Vdss). This substitute maintains similar on-resistance performance and power dissipation characteristics.

Category B - Moderate Current Capability (17A-45A): AOD424 and STD17NF03LT4 offer reduced current ratings but maintain the same package footprint and operating temperature range. These are suitable for applications where the full 120A capability is not required.

All substitutes share identical package configuration (TO-252-3 DPAK), surface mount technology, and moisture sensitivity level (MSL 1).

Parameter Comparison

Parameter	IRLR3717TRLPBF	STD86N3LH5	AOD424	STD17NF03LT4
Manufacturer	Infineon Technologies	STMicroelectronics	Alpha & Omega Semiconductor	STMicroelectronics
Vdss (V)	20	30	20	30
Id @ 25°C (A)	120 (Tc)	80 (Tc)	45 (Tc)	17 (Tc)
Rds On (mOhm)	4 @ 15A, 10V	5 @ 40A, 10V	4.4 @ 20A, 4.5V	50 @ 8.5A, 10V
Vgs(th) (V)	2.45 @ 250µA	2.5 @ 250µA	1.6 @ 250µA	2.2 @ 250µA
Gate Charge (nC)	31 @ 4.5V	14 @ 5V	43 @ 10V	6.5 @ 5V
Power Dissipation (W)	89 (Tc)	70 (Tc)	100 (Tc)	30 (Tc)
Operating Temperature (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175
Package	TO-252-3 (DPAK)	TO-252-3 (DPAK)	TO-252-3 (DPAK)	TO-252-3 (DPAK)
Product Status	Obsolete	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STD86N3LH5 (STMicroelectronics STripFET™ V Series)

This substitute is the primary recommendation for direct replacement in applications requiring sustained high-current operation. The STD86N3LH5 delivers 80A continuous drain current, representing 67% of the original part's rating. The 30V Vdss rating provides additional voltage margin beyond the 20V specification. On-resistance of 5mOhm at 40A, 10V is comparable to the original device. Power dissipation capability of 70W (Tc) is slightly reduced but remains suitable for most thermal environments. The part carries AEC-Q101 automotive qualification and ROHS3 compliance. Product status is active with substantial inventory availability (18,895 pcs).

AOD424 (Alpha & Omega Semiconductor)

This substitute is suitable for applications where current requirements do not exceed 45A (Tc). The AOD424 maintains the 20V Vdss rating matching the original specification exactly. On-resistance of 4.4mOhm at 20A, 4.5V is within acceptable tolerance of the original device. Power dissipation of 100W (Tc) exceeds the original part, providing thermal headroom. The lower gate threshold voltage (1.6V) may require gate drive circuit verification. Product status is active with high inventory availability (17,638 pcs). ROHS3 compliance is confirmed.

STD17NF03LT4 (STMicroelectronics STripFET™ II Series)

This substitute is applicable only to applications where continuous drain current does not exceed 17A. The 30V Vdss rating provides voltage margin. However, the on-resistance of 50mOhm at 8.5A, 10V represents a significant increase compared to the original device, resulting in higher conduction losses. Gate charge of 6.5nC is substantially lower, reducing switching losses. Power dissipation of 30W (Tc) is the lowest among all options. Product status is active with good inventory availability (8,694 pcs). ROHS3 compliance is confirmed.

Frequently Asked Questions (FAQ)

Q: Can STD86N3LH5 be used as a direct pin-for-pin replacement for IRLR3717TRLPBF?

A: Yes. Both devices use identical TO-252-3 (DPAK) packaging with the same pin configuration. Mechanical and thermal interface compatibility is confirmed. Electrical parameters are within acceptable substitution tolerance for most applications.

Q: What is the current derating consideration when using STD86N3LH5?

A: The STD86N3LH5 is rated for 80A continuous drain current compared to the original 120A rating. Applications requiring sustained current above 80A cannot use this substitute. Thermal design must account for the reduced power dissipation rating (70W vs. 89W).

Q: Is AOD424 suitable for high-frequency switching applications?

A: AOD424 has a gate charge of 43nC at 10V, which is higher than the original part (31nC at 4.5V). This results in increased gate drive power requirements and potentially slower switching transitions. Gate drive circuit capability must be verified before substitution.

Q: Why does STD17NF03LT4 have significantly higher on-resistance?

A: STD17NF03LT4 is designed for lower current applications (17A continuous). The higher on-resistance (50mOhm) is a design trade-off that reduces gate charge and switching losses. This part is not suitable for applications requiring the original part's current-handling capability.

Q: Are all substitutes RoHS compliant?

A: Yes. STD86N3LH5, AOD424, and STD17NF03LT4 all carry ROHS3 compliance certification. The original IRLR3717TRLPBF RoHS status is not specified in the provided data.

Q: What is the moisture sensitivity level for all parts?

A: All parts, including the original and all three substitutes, are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Can these substitutes be used interchangeably in the same PCB design?

A: All three substitutes share identical TO-252-3 (DPAK) packaging and can be physically mounted on the same PCB footprint. However, electrical performance differences require circuit validation. Gate drive voltage, thermal management, and current requirements must be re-evaluated for each substitute.

Q: Which substitute has the best thermal performance?

A: AOD424 offers the highest power dissipation rating at 100W (Tc), providing the greatest thermal margin. STD86N3LH5 provides 70W (Tc), and STD17NF03LT4 provides 30W (Tc). Thermal performance selection depends on application current levels and ambient conditions.

Q: Is automotive qualification required for my application?

A: STD86N3LH5 carries AEC-Q101 automotive qualification. If automotive-grade components are required, this is the only substitute meeting that specification. AOD424 and STD17NF03LT4 do not list automotive qualification in the provided data.

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