IRFR3418TRLPBF N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRFR3418TRLPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 80V drain-to-source voltage and 70A continuous drain current in a surface mount TO-252AA (DPAK) package. This device is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The HEXFET® series device operates across a temperature range of -55°C to 175°C and is suitable for applications requiring moderate voltage and high current switching capability in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	80	V
Continuous Drain Current (Id) @ 25°C	70	A (Tc)
On-Resistance (Rds On) @ Id, Vgs	14	mOhm @ 18A, 10V
Gate Threshold Voltage (Vgs(th)) @ Id	5.5	V @ 250µA
Gate Charge (Qg) @ Vgs	94	nC @ 10V
Input Capacitance (Ciss) @ Vds	3510	pF @ 25V
Power Dissipation (Max)	3.8 / 140	W (Ta) / W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 (DPAK)	Surface Mount
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the IRFR3418TRLPBF is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss): Substitute must equal or exceed 80V
Continuous Drain Current (Id): Substitute must support required application current
On-Resistance (Rds On): Lower values indicate improved performance; higher values increase power dissipation
Gate Threshold Voltage (Vgs(th)): Must be compatible with gate drive circuitry
Gate Charge (Qg): Affects switching speed and gate drive requirements
Input Capacitance (Ciss): Influences gate drive circuit design
Operating Temperature Range: Must encompass application requirements

Mechanical Compatibility Criteria:

Package Type: All substitutes must use TO-252-3 (DPAK) surface mount package
Mounting Type: Surface mount configuration required
Pin Configuration: DPAK (2 Leads + Tab) standard

Compliance and Status Criteria:

Product Status: Active parts preferred for long-term availability
RoHS Compliance: ROHS3 compliance preferred for regulatory alignment
Moisture Sensitivity Level (MSL): MSL 1 (Unlimited) acceptable

The substitute parts listed below satisfy these criteria with varying degrees of electrical performance trade-offs suitable for different application requirements.

Parameter Comparison

Parameter	IRFR3418TRLPBF	IRFR3710ZTRLPBF	AOD2816	IRLR024 / IRLR024TR / IRLR024TRL / IRLR024TRR
Manufacturer	Infineon	Infineon	Alpha & Omega	Vishay Siliconix
Vdss (V)	80	100	80	60
Id @ 25°C (A)	70 (Tc)	42 (Tc)	35 (Tc)	14 (Tc)
Rds On (mOhm)	14 @ 18A, 10V	18 @ 33A, 10V	15 @ 20A, 10V	100 @ 8.4A, 5V
Vgs(th) (V)	5.5 @ 250µA	4 @ 250µA	3.5 @ 250µA	2 @ 250µA
Qg (nC)	94 @ 10V	100 @ 10V	22 @ 10V	18 @ 5V
Ciss (pF)	3510 @ 25V	2930 @ 25V	1109 @ 40V	870 @ 25V
Power Dissipation (W)	3.8 (Ta) / 140 (Tc)	140 (Tc)	2.5 (Ta) / 53.5 (Tc)	2.5 (Ta) / 42 (Tc)
Operating Temp (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 150
Package	TO-252-3 (DPAK)	TO-252-3 (DPAK)	TO-252 (DPAK)	TO-252-3 (DPAK)
Product Status	Obsolete	Active	Active	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-compliant

Engineering Selection Recommendations

IRFR3710ZTRLPBF (Infineon Technologies)

This part is the primary direct substitute from the same manufacturer. It maintains the HEXFET® series lineage and offers active product status with ROHS3 compliance. The 100V Vdss rating provides enhanced voltage margin over the original 80V specification. The continuous drain current of 42A is lower than the original 70A, requiring evaluation against application peak current demands. The slightly higher Rds On (18mOhm vs. 14mOhm) results in marginally increased power dissipation. The operating temperature range matches the original (-55°C to 175°C). This substitute is suitable for applications where the 42A current rating is sufficient and the higher voltage rating is beneficial.

AOD2816 (Alpha & Omega Semiconductor Inc.)

This part maintains the 80V Vdss rating and offers active product status with ROHS3 compliance. The continuous drain current of 35A (Tc) is substantially lower than the original 70A specification. The Rds On of 15mOhm is comparable to the original. The significantly lower gate charge (22nC vs. 94nC) and input capacitance (1109pF vs. 3510pF) indicate faster switching characteristics and reduced gate drive requirements. This substitute is applicable to lower-current applications where the 35A rating is adequate and improved switching performance is advantageous.

IRLR024 / IRLR024TR / IRLR024TRL / IRLR024TRR (Vishay Siliconix)

These variants represent the same base device (IRLR024) in different packaging configurations. All maintain active product status but are RoHS non-compliant. The 60V Vdss rating is below the original 80V specification, limiting use to applications with lower voltage requirements. The continuous drain current of 14A is significantly lower than the original 70A. The substantially higher Rds On (100mOhm vs. 14mOhm) results in considerably increased power dissipation and heat generation. The lower gate threshold voltage (2V vs. 5.5V) and reduced gate charge (18nC vs. 94nC) indicate compatibility with lower gate drive voltages. These substitutes are suitable only for low-current, low-voltage applications where the electrical trade-offs are acceptable.

Selection Basis:

IRFR3710ZTRLPBF is recommended for applications requiring voltage margin and active product status with modern compliance certifications.
AOD2816 is recommended for applications prioritizing switching speed and reduced gate drive complexity.
IRLR024 variants are recommended only when application requirements align with significantly reduced current and voltage ratings and RoHS non-compliance is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the IRFR3710ZTRLPBF directly replace the IRFR3418TRLPBF in all applications?

A: The IRFR3710ZTRLPBF is mechanically compatible (same TO-252-3 DPAK package) and electrically compatible for applications where the 42A continuous drain current is sufficient. The higher 100V Vdss rating provides additional voltage margin. Applications requiring the full 70A current rating of the original device cannot use this substitute without circuit redesign.

Q: What is the primary limitation of the IRLR024 series as a substitute?

A: The IRLR024 series has a maximum Vdss of 60V, which is below the original 80V specification. Additionally, the 14A continuous drain current is significantly lower than the original 70A. The substantially higher Rds On (100mOhm) generates considerably more heat. These devices are suitable only for applications with reduced voltage and current requirements.

Q: Does the AOD2816 require different gate drive circuitry than the IRFR3418TRLPBF?

A: The AOD2816 has a lower gate threshold voltage (3.5V vs. 5.5V) and significantly lower gate charge (22nC vs. 94nC). Existing gate drive circuits designed for the original device will function with the AOD2816, but the lower gate charge may allow for faster switching transitions. No circuit modification is required for basic functionality.

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts listed use the TO-252-3 (DPAK) surface mount package, maintaining mechanical compatibility with the original IRFR3418TRLPBF. Packaging variations (tape and reel, cut tape, etc.) differ by supplier but do not affect electrical or mechanical compatibility on the PCB.

Q: Why is the IRFR3418TRLPBF classified as obsolete?

A: The IRFR3418TRLPBF is an older HEXFET® design from Infineon Technologies. Obsolescence typically results from manufacturer discontinuation in favor of newer device generations with improved performance, compliance certifications, or manufacturing efficiency. Active substitutes from the same or alternative manufacturers provide equivalent or superior functionality.

Q: Can the IRLR024 variants be used interchangeably with each other?

A: Yes. The IRLR024, IRLR024TR, IRLR024TRL, and IRLR024TRR variants share identical electrical specifications. The suffix designations indicate different packaging formats (tape and reel configurations) supplied by Vishay Siliconix. Electrical performance and PCB compatibility are identical across all variants.

Q: What is the impact of higher Rds On in the IRLR024 on circuit performance?

A: The IRLR024 has an Rds On of 100mOhm compared to 14mOhm in the original device. At equivalent current levels, power dissipation increases proportionally (P = I²R). For a 10A application, the IRLR024 dissipates 10W compared to 1.4W in the original device. This increased dissipation requires enhanced thermal management and limits the IRLR024 to significantly lower current applications.

Q: Is ROHS3 compliance a critical factor in selecting a substitute?

A: ROHS3 compliance is a regulatory requirement in many markets and is preferred for new designs. The IRFR3710ZTRLPBF and AOD2816 are ROHS3 compliant. The IRLR024 variants are RoHS non-compliant. Compliance requirements depend on application market and end-use regulations. Designs targeting regulated markets should prioritize ROHS3-compliant substitutes.

Q: What is the significance of the operating temperature range difference between substitutes?

A: The IRFR3418TRLPBF, IRFR3710ZTRLPBF, and AOD2816 all operate from -55°C to 175°C. The IRLR024 variants operate from -55°C to 150°C, providing a 25°C lower maximum junction temperature. Applications requiring operation at temperatures above 150°C cannot use the IRLR024 variants. This difference is significant for high-temperature industrial and automotive applications.

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