IRLR7843TRLPBF N-Channel 30V 161A MOSFET Equivalent & Substitute Parts

Part Overview

The IRLR7843TRLPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage with 161A continuous drain current at 25°C. This device is packaged in TO-252-3 (DPAK) surface mount configuration and belongs to the HEXFET® series. The part is designated as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for design continuity, inventory management, and sourcing alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	161	A (Tc)
On-Resistance (Rds On) @ 15A, 10V	3.3	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.3	V
Power Dissipation (Max)	140	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 IRLR7843TRLPBF is determined by the following critical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
Package Type: Must be TO-252-3 (DPAK) surface mount configuration
FET Type: N-Channel MOSFET technology
Operating Temperature Range: Must support -55°C to 175°C
Mounting Type: Surface mount only

Secondary Compatibility Parameters:

Continuous Drain Current (Id): Minimum 161A at 25°C for direct replacement; lower ratings indicate reduced current capacity
On-Resistance (Rds On): Lower values indicate improved performance; values at or below 3.3mOhm @ specified conditions maintain thermal characteristics
Gate Threshold Voltage (Vgs(th)): Must be within ±20V maximum gate voltage specification
Power Dissipation: Minimum 140W at case temperature for thermal equivalence

The substitute parts listed below are grouped into two categories: MFR Recommended (manufacturer-approved alternatives) and Parametric Equivalent (parts meeting core electrical and mechanical specifications).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Power Diss. (W)	Package	Product Status
IRLR7843TRLPBF	Infineon	30	161 (Tc)	3.3 @ 15A, 10V	2.3 @ 250µA	140 (Tc)	TO-252-3 (DPAK)	Not For New Designs
IRLR7843TRPBF	Infineon	30	161 (Tc)	3.3 @ 15A, 10V	2.3 @ 250µA	140 (Tc)	TO-252-3 (DPAK)	Active
IPD90N03S4L03ATMA1	Infineon	30	90 (Tc)	3.3 @ 90A, 10V	2.2 @ 45µA	94 (Tc)	TO-252-3 (DPAK)	Last Time Buy
FDD8870	onsemi	30	160 (Tc)	3.9 @ 35A, 10V	2.5 @ 250µA	160 (Tc)	TO-252-3 (DPAK)	Obsolete
STD100N3LF3	STMicroelectronics	30	80 (Tc)	5.5 @ 40A, 10V	2.5 @ 250µA	110 (Tc)	TO-252-3 (DPAK)	Obsolete
STD155N3LH6	STMicroelectronics	30	80 (Tc)	3.0 @ 40A, 10V	2.5 @ 250µA	110 (Tc)	TO-252-3 (DPAK)	Active

Engineering Selection Recommendations

Direct Parametric Equivalent:

IRLR7843TRPBF is the parametric equivalent of IRLR7843TRLPBF. Both parts share identical electrical specifications (30V, 161A, 3.3mOhm Rds On, 140W power dissipation) and package configuration. The primary difference is product status: IRLR7843TRPBF is Active, while IRLR7843TRLPBF is Not For New Designs. IRLR7843TRPBF is available in Cut Tape (CT) & Digi-Reel® packaging, providing greater inventory availability (37,110 pcs in stock versus 14,500 pcs). Both parts are ROHS3 Compliant and carry identical compliance certifications (REACH Unaffected, EAR99, HTSUS 8541.29.0095).

MFR Recommended Alternatives:

IPD90N03S4L03ATMA1 (Infineon OptiMOS™ series) provides reduced continuous drain current (90A versus 161A) and lower power dissipation (94W versus 140W). This part is suitable for applications where current requirements do not exceed 90A. On-resistance remains equivalent at 3.3mOhm @ specified conditions. Product status is Last Time Buy, indicating limited availability.

FDD8870 (onsemi PowerTrench® series) delivers 160A continuous drain current and 160W power dissipation, closely matching the original specification. On-resistance is slightly higher at 3.9mOhm @ 35A, 10V. This part is designated Obsolete and should not be selected for new designs despite electrical compatibility.

STD155N3LH6 (STMicroelectronics STripFET™ VI series) is Active and provides 80A continuous drain current with improved on-resistance of 3.0mOhm @ 40A, 10V. Power dissipation is 110W. This part is suitable for applications with reduced current requirements and offers superior thermal performance per ampere.

STD100N3LF3 (STMicroelectronics STripFET™ II series) is Obsolete and provides 80A continuous drain current with on-resistance of 5.5mOhm @ 40A, 10V. This part should not be selected for new designs.

Compliance and Certification:

All listed parts maintain ROHS3 compliance, REACH Unaffected status, and identical ECCN/HTSUS classifications. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no moisture precautions are required during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can IRLR7843TRPBF directly replace IRLR7843TRLPBF?

A: Yes. IRLR7843TRPBF is a parametric equivalent with identical electrical specifications and package configuration. The only difference is product status (Active versus Not For New Designs) and packaging format (Cut Tape & Digi-Reel® versus Tape & Reel). Both parts are pin-compatible and functionally interchangeable.

Q: What is the difference between the substitute parts in terms of current capacity?

A: IRLR7843TRPBF and FDD8870 maintain 160-161A continuous drain current, matching the original specification. IPD90N03S4L03ATMA1 provides 90A, while STD100N3LF3 and STD155N3LH6 provide 80A. Selection depends on application current requirements.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use TO-252-3 (DPAK) surface mount packaging with identical pin configuration and mechanical dimensions. PCB layout modifications are not required for substitution.

Q: Which substitute part should be selected for new designs?

A: IRLR7843TRPBF is the recommended choice for new designs, as it is the only Active parametric equivalent with full specification matching. STD155N3LH6 is also Active and suitable for applications with reduced current requirements (80A maximum).

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

A: This designation indicates the part has reached end-of-life and is no longer recommended for new product development. Existing inventory may be available, but long-term supply cannot be guaranteed. Active alternatives should be prioritized for new designs.

Q: How do on-resistance values affect thermal performance?

A: Lower on-resistance (Rds On) values reduce power dissipation at equivalent current levels. IRLR7843TRPBF and IPD90N03S4L03ATMA1 both provide 3.3mOhm, while STD155N3LH6 provides 3.0mOhm (superior). Higher on-resistance values (5.5mOhm for STD100N3LF3) increase heat generation and require enhanced thermal management.

Q: Are there packaging format differences among the substitute parts?

A: Yes. IRLR7843TRPBF is available in Cut Tape (CT) & Digi-Reel® format. IPD90N03S4L03ATMA1 is supplied in Cut Tape (CT) only. STD100N3LF3 and STD155N3LH6 are available in Cut Tape (CT) & Digi-Reel® format. Packaging format does not affect electrical or mechanical compatibility; it affects only supply and handling logistics.

Q: Can lower-current parts (80A or 90A) be used in applications designed for 161A?

A: Lower-current parts can be used only if the application's actual current requirements do not exceed the substitute part's rating. Exceeding the continuous drain current specification will result in thermal runaway and device failure. Circuit analysis must confirm that peak and sustained currents remain within the substitute part's limits.

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