IRLR8743PBF N-Channel 30V 160A MOSFET Equivalent & Substitute Parts

Part Overview

The IRLR8743PBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage and 160A continuous drain current at 25°C. This device is packaged in TO-252AA (DPAK) surface mount configuration and is part of the HEXFET® series. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and production requirements. Substitute parts are selected based on matching or exceeding critical electrical parameters while maintaining compatible packaging and thermal characteristics.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	160	A (Tc)
Rds On (Max) @ Id, Vgs	3.1 mOhm @ 25A, 10V	mOhm
Gate Threshold Voltage Vgs(th) (Max)	2.35	V @ 100µA
Power Dissipation (Max)	135	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 logic for the IRLR8743PBF is based on the following critical parameters:

Primary Matching Criteria:

Drain-to-Source Voltage (Vdss): 30V minimum
Continuous Drain Current (Id): 160A or higher at 25°C
Package Type: TO-252-3 DPAK or compatible surface mount
Operating Temperature Range: -55°C to 175°C
RoHS3 Compliance

Secondary Compatibility Factors:

Rds On characteristics within acceptable range for thermal performance
Gate charge and input capacitance for drive circuit compatibility
Maximum gate voltage rating (±20V or ±16V acceptable)

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (160A Rating): Parts maintaining the full 160A continuous drain current specification, suitable for direct replacement in applications requiring maximum current handling.

Category B - Reduced Current Alternatives (80-90A Rating): Parts with lower continuous drain current ratings, applicable only in designs where current requirements do not exceed the substitute part's specification.

Category C - Voltage Upgraded Alternative (40V Rating): Parts with higher voltage rating, suitable for applications where voltage margin is beneficial, though not required for 30V operation.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Power Dissipation (W)	Package	Product Status
IRLR8743PBF	Infineon	30	160 (Tc)	3.1 @ 25A, 10V	135	TO-252AA DPAK	Discontinued
IPD031N03LGATMA1	Infineon	30	90 (Tc)	3.1 @ 30A, 10V	94	TO-252-3 DPAK	Active
IPD90N03S4L03ATMA1	Infineon	30	90 (Tc)	3.3 @ 90A, 10V	94	TO-252-3 DPAK	Last Time Buy
AOD508	Alpha & Omega Semiconductor	30	70 (Tc)	3.0 @ 20A, 10V	50	TO-252 DPAK	Not For New Designs
FDD8870	onsemi	30	160 (Tc)	3.9 @ 35A, 10V	160	TO-252AA	Obsolete
STB270N4F3	STMicroelectronics	40	160 (Tc)	2.5 @ 80A, 10V	330	D2PAK	Active
STD100N3LF3	STMicroelectronics	30	80 (Tc)	5.5 @ 40A, 10V	110	DPAK	Obsolete
STD150N3LLH6	STMicroelectronics	30	80 (Tc)	2.8 @ 40A, 10V	110	DPAK	Obsolete
STD17NF03LT4	STMicroelectronics	30	17 (Tc)	50 @ 8.5A, 10V	30	DPAK	Active

Engineering Selection Recommendations

For Direct Replacement (160A Continuous Current Required):

FDD8870 (onsemi PowerTrench®) is the only substitute part maintaining 160A continuous drain current specification. However, this part is marked Obsolete. The FDD8870 provides equivalent current handling with slightly higher Rds On (3.9 mOhm vs. 3.1 mOhm) and higher power dissipation (160W vs. 135W), requiring thermal design verification. Package compatibility is confirmed (TO-252AA DPAK). RoHS3 compliance is maintained.

For Reduced Current Applications (80-90A Continuous Current):

IPD031N03LGATMA1 (Infineon OptiMOS™, Active status) and IPD90N03S4L03ATMA1 (Infineon OptiMOS™, Last Time Buy status) both provide 90A continuous drain current with 30V Vdss rating. IPD031N03LGATMA1 offers superior Rds On performance (3.1 mOhm) and lower power dissipation (94W). Both parts are packaged in TO-252-3 DPAK with RoHS3 compliance. These parts are suitable only for applications where 90A current is sufficient.

STD150N3LLH6 (STMicroelectronics DeepGATE™/STripFET™ VI, Obsolete) provides 80A continuous current with excellent Rds On (2.8 mOhm @ 40A, 10V) and 30V Vdss. DPAK packaging and RoHS3 compliance confirmed. Obsolete status limits availability.

For Voltage-Upgraded Applications:

STB270N4F3 (STMicroelectronics STripFET™ III, Active status) provides 160A continuous current at 40V Vdss with superior Rds On (2.5 mOhm @ 80A, 10V) and higher power dissipation capability (330W). Package is D2PAK (TO-263-3), requiring PCB layout modification. AEC-Q101 automotive qualification and RoHS3 compliance confirmed. Suitable for designs requiring higher voltage margin.

For Low Current Applications:

STD17NF03LT4 (STMicroelectronics STripFET™ II, Active status) provides 17A continuous current at 30V Vdss. DPAK packaging and RoHS3 compliance confirmed. Active product status ensures long-term availability. Suitable only for applications with current requirements below 17A.

Frequently Asked Questions (FAQ)

Q: Can IPD031N03LGATMA1 or IPD90N03S4L03ATMA1 directly replace IRLR8743PBF in all applications?

A: No. These parts provide 90A continuous drain current versus the IRLR8743PBF's 160A rating. Direct replacement is limited to applications where continuous drain current does not exceed 90A at 25°C. Circuit current requirements must be verified before substitution.

Q: What is the difference between IPD031N03LGATMA1 and IPD90N03S4L03ATMA1?

A: Both parts provide 30V Vdss and 90A continuous drain current. IPD031N03LGATMA1 is Active status with Rds On of 3.1 mOhm @ 30A, 10V. IPD90N03S4L03ATMA1 is Last Time Buy status with Rds On of 3.3 mOhm @ 90A, 10V. IPD031N03LGATMA1 offers better on-resistance performance and longer product availability.

Q: Is FDD8870 a suitable replacement despite Obsolete status?

A: FDD8870 maintains 160A continuous current and 30V Vdss specifications, making it electrically compatible. However, Obsolete status indicates limited or no future availability. Use only if existing inventory is confirmed and long-term supply is not required. Rds On is slightly higher (3.9 mOhm vs. 3.1 mOhm), requiring thermal analysis.

Q: Why is STB270N4F3 rated at 40V instead of 30V?

A: STB270N4F3 is a voltage-upgraded alternative providing higher voltage margin. The 40V rating does not prevent operation at 30V; it provides additional design margin. However, package change from TO-252AA DPAK to D2PAK requires PCB layout modification. Use only if voltage upgrade is beneficial and layout change is feasible.

Q: Can STD150N3LLH6 or STD100N3LF3 replace IRLR8743PBF?

A: These parts provide only 80A continuous current versus 160A required. Substitution is limited to applications where continuous drain current does not exceed 80A. Both parts are Obsolete, limiting availability. STD150N3LLH6 offers superior Rds On (2.8 mOhm) compared to STD100N3LF3 (5.5 mOhm).

Q: What packaging considerations apply to substitute parts?

A: IRLR8743PBF uses TO-252AA DPAK. Most substitutes (IPD031N03LGATMA1, IPD90N03S4L03ATMA1, AOD508, FDD8870, STD100N3LF3, STD150N3LLH6, STD17NF03LT4) use compatible TO-252-3 DPAK or TO-252 DPAK packages with identical pin configuration. STB270N4F3 uses D2PAK (TO-263-3), requiring PCB layout modification. Verify package footprint compatibility before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant, matching the IRLR8743PBF compliance status. REACH Unaffected status is confirmed for all parts.

Q: What is the significance of product status (Active, Obsolete, Last Time Buy)?

A: Active status indicates ongoing production and long-term availability. Last Time Buy indicates limited production window before discontinuation. Obsolete indicates no further production. For new designs, prioritize Active status parts. For legacy support, Obsolete parts may be acceptable if inventory is confirmed.

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