IRLR8743TRLPBF N-Channel 30V 160A MOSFET Equivalent & Substitute Parts

Part Overview

The IRLR8743TRLPBF is an N-Channel MOSFET manufactured by Infineon Technologies, part of the HEXFET® series. This device is rated for 30V drain-to-source voltage with 160A continuous drain current at 25°C and 135W maximum power dissipation. The component is housed in a TO-252AA (DPAK) surface mount package.

The IRLR8743TRLPBF is classified as Obsolete. Due to its discontinued status, equivalent and substitute parts are necessary for ongoing production, maintenance, and new design implementations where this performance class is required.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	160	A (Tc)
On-State Resistance (Rds On) @ 25A, 10V	3.1	mOhm
Gate Threshold Voltage (Vgs(th)) @ 100µA	2.35	V
Maximum Gate Voltage (Vgs)	±20	V
Power Dissipation (Max)	135	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 (DPAK)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the IRLR8743TRLPBF is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
Continuous Drain Current (Id): Must equal or exceed 160A at 25°C
On-State Resistance (Rds On): Must be compatible with circuit requirements
Package Type: TO-252-3 (DPAK) or equivalent surface mount package
Operating Temperature Range: Must support -55°C to 175°C
RoHS Compliance: ROHS3 Compliant

Direct Equivalent (Same Performance Class): The IRLR8743TRPBF is a direct equivalent with identical electrical specifications. The only difference is packaging format (Tape & Reel vs. Tube), making it a pin-for-pin replacement with Active product status.

Functional Substitutes (Reduced Current Rating): Parts such as IPD031N03LGATMA1, IPD90N03S4L03ATMA1, and NP90N03VHG-E1-AY operate at 90A continuous drain current, which is below the original 160A specification. These are suitable only for applications where the lower current rating is acceptable.

Functional Substitutes (Different Package): STB155N3LH6 and STB270N4F3 use D2PAK (TO-263) packaging instead of DPAK, requiring PCB layout modifications.

Legacy/Obsolete Alternatives: AOD508, FDD8870, and STD150N3LLH6 are provided as historical references but carry Obsolete or Not For New Designs status.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Power Diss. (W)	Package	Status
IRLR8743TRLPBF	Infineon	30	160	3.1	2.35	135	TO-252-3 (DPAK)	Obsolete
IRLR8743TRPBF	Infineon	30	160	3.1	2.35	135	TO-252-3 (DPAK)	Active
IPD031N03LGATMA1	Infineon	30	90	3.1	2.2	94	TO-252-3 (DPAK)	Active
IPD90N03S4L03ATMA1	Infineon	30	90	3.3	2.2	94	TO-252-3 (DPAK)	Last Time Buy
AOD508	Alpha & Omega	30	70	3.0	2.2	50	TO-252 (DPAK)	Not For New Designs
FDD8870	onsemi	30	160	3.9	2.5	160	TO-252AA	Obsolete
NP90N03VHG-E1-AY	Renesas	30	90	3.2	4.0	105	TO-252	Active
STB155N3LH6	STMicroelectronics	30	80	3.0	2.5	110	TO-263 (D2PAK)	Active
STB270N4F3	STMicroelectronics	40	160	2.5	4.0	330	TO-263 (D2PAK)	Active
STD150N3LLH6	STMicroelectronics	30	80	2.8	2.5	110	TO-252-3 (DPAK)	Obsolete

Engineering Selection Recommendations

For Direct Replacement (Recommended): IRLR8743TRPBF is the primary recommendation. It maintains identical electrical specifications and package type as the original IRLR8743TRLPBF. The only distinction is Active product status and Tape & Reel packaging format. This part is suitable for all applications previously using the TRLPBF variant.

For Current-Reduced Applications: IPD031N03LGATMA1 and IPD90N03S4L03ATMA1 are suitable only when application requirements permit operation at 90A continuous drain current instead of 160A. Both maintain 30V Vdss rating and TO-252-3 (DPAK) package compatibility. IPD031N03LGATMA1 carries Active status, while IPD90N03S4L03ATMA1 is Last Time Buy.

For Package-Variant Applications: STB155N3LH6 provides 80A continuous drain current in TO-263 (D2PAK) package with Active status. STB270N4F3 provides 160A continuous drain current in TO-263 (D2PAK) package but operates at 40V Vdss and carries Automotive qualification (AEC-Q101). Both require PCB layout modifications due to different package footprint.

For Legacy System Maintenance: FDD8870 (onsemi) and STD150N3LLH6 (STMicroelectronics) are available for existing systems but carry Obsolete status. These should not be selected for new designs.

Compliance Verification: All recommended parts maintain ROHS3 compliance and REACH Unaffected status, consistent with the original IRLR8743TRLPBF specifications.

Frequently Asked Questions (FAQ)

Q1: Can IRLR8743TRPBF directly replace IRLR8743TRLPBF?

A: Yes. IRLR8743TRPBF is a direct pin-for-pin replacement with identical electrical specifications (30V, 160A, 3.1mOhm Rds On, 135W power dissipation) and package type (TO-252-3 DPAK). The difference is packaging format (Tape & Reel vs. Tube) and Active product status. No circuit modifications are required.

Q2: Why do IPD031N03LGATMA1 and IPD90N03S4L03ATMA1 have lower current ratings?

A: These parts are from Infineon's OptiMOS™ series and are rated for 90A continuous drain current versus the original 160A. They are functional substitutes only for applications where the lower current rating is acceptable. They maintain the same 30V Vdss and TO-252-3 (DPAK) package.

Q3: What is the difference between STB155N3LH6 and STD150N3LLH6?

A: STB155N3LH6 uses TO-263 (D2PAK) package with Active status, while STD150N3LLH6 uses TO-252-3 (DPAK) package with Obsolete status. Both are rated for 80A continuous drain current at 30V. Package selection depends on PCB layout requirements.

Q4: Can STB270N4F3 replace IRLR8743TRLPBF?

A: STB270N4F3 can functionally replace IRLR8743TRLPBF in applications where 40V Vdss is acceptable (higher voltage rating provides margin). It maintains 160A continuous drain current and TO-263 (D2PAK) package. However, PCB layout modifications are required due to different package footprint. This part carries Automotive qualification (AEC-Q101).

Q5: What does "Last Time Buy" status mean for IPD90N03S4L03ATMA1?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. Existing inventory is available, but no future production is planned. For new designs, IPD031N03LGATMA1 (Active status) is preferred if 90A current rating is acceptable.

Q6: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance and REACH Unaffected status, consistent with the original IRLR8743TRLPBF.

Q7: Which substitute part has the lowest on-state resistance?

A: STB270N4F3 has the lowest Rds On at 2.5mOhm @ 80A, 10V. However, this part operates at 40V Vdss and requires D2PAK package accommodation.

Q8: Can AOD508 be used as a substitute?

A: AOD508 is listed as "Not For New Designs" and carries lower current rating (70A vs. 160A). It should be used only for legacy system maintenance where no alternatives are available.

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