IRLR8721PBF N-Channel 30V 65A MOSFET Equivalent & Substitute Parts

Part Overview

The IRLR8721PBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage and 65A continuous drain current in a surface mount TO-252AA (DPAK) package. This device is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The IRLR8721PBF belongs to the HEXFET® series and is designed for applications requiring moderate voltage and high current switching capability in a compact surface mount form factor. Substitution is required due to product discontinuation and limited inventory availability for new designs.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Id)	65	A (Tc)
Power Dissipation (Max)	65	W (Tc)
On-Resistance (Rds On) @ 25A, 10V	8.4	mOhm
Gate Threshold Voltage (Vgs(th)) @ 25µA	2.35	V
Gate Charge (Qg) @ 4.5V	13	nC
Input Capacitance (Ciss) @ 15V	1030	pF
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252-3 (DPAK)	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)	MSL

Substitute Part Grouping Explanation

Substitution of the IRLR8721PBF is determined by the following critical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must be ≥30V
Continuous Drain Current (Id): Must support ≥65A at Tc
Package Type: Must be TO-252-3 (DPAK) surface mount
Operating Temperature Range: Must support -55°C to 175°C
Gate Drive Voltage Compatibility: 4.5V and 10V drive voltage support

Secondary Compatibility Parameters:

On-Resistance (Rds On): Lower values indicate improved performance
Gate Charge (Qg): Lower values reduce switching losses
Input Capacitance (Ciss): Affects gate drive requirements
Moisture Sensitivity Level: Must be MSL 1 or equivalent

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (≥65A rated current): Parts meeting or exceeding the 65A continuous drain current specification with matching voltage and package requirements.

Category B - Reduced Current Alternatives (40A-80A range): Parts with current ratings below or above 65A but within acceptable operating margins for applications with flexible current headroom, provided all other electrical and mechanical parameters remain compatible.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ Tc (A)	Rds On (mOhm)	Qg (nC)	Ciss (pF)	Pd Max (W)	Status	Package
IRLR8721PBF	Infineon	30	65	8.4 @ 25A, 10V	13 @ 4.5V	1030 @ 15V	65	Obsolete	TO-252-3
IPD090N03LGATMA1	Infineon	30	40	9 @ 30A, 10V	15 @ 10V	1600 @ 15V	42	Active	TO-252-3
STD150N3LLH6	STMicroelectronics	30	80	2.8 @ 40A, 10V	29 @ 4.5V	3700 @ 25V	110	Obsolete	TO-252-3
DMN3010LK3-13	Diodes Incorporated	30	43	9.5 @ 18A, 10V	37 @ 10V	2075 @ 15V	1.6	Active	TO-252-3
FDD6670A	onsemi	30	66	8 @ 15A, 10V	22 @ 5V	1755 @ 15V	63	Last Time Buy	TO-252-3
FDD8876	onsemi	30	73	8.2 @ 35A, 10V	47 @ 10V	1700 @ 15V	70	Obsolete	TO-252-3
STD100N3LF3	STMicroelectronics	30	80	5.5 @ 40A, 10V	27 @ 5V	2060 @ 25V	110	Obsolete	TO-252-3
STD70NS04ZL	STMicroelectronics	33	70	10.5 @ 30A, 10V	32 @ 5V	1800 @ 25V	110	Active	TO-252-3

Engineering Selection Recommendations

For Active Product Status Requirement:

If procurement must prioritize active, non-obsolete components, the following substitutes are recommended:

IPD090N03LGATMA1 (Infineon, Active): OptiMOS™ series device with 40A continuous drain current. Suitable for applications where current margin below 65A is acceptable. ROHS3 compliant. Infineon manufacturer continuity provides design support consistency.
DMN3010LK3-13 (Diodes Incorporated, Active): 43A continuous drain current (Tc) rated device. ROHS3 compliant. Provides alternative sourcing from established manufacturer.
STD70NS04ZL (STMicroelectronics, Active): 70A continuous drain current with 33V Vdss rating. SAFeFET™ series. ROHS3 compliant. Exceeds current requirement with higher voltage margin.

For Closest Electrical Performance Match:

FDD6670A (onsemi, Last Time Buy): 66A continuous drain current, matching the IRLR8721PBF specification within 1.5%. PowerTrench® series. ROHS3 compliant. On-resistance of 8mOhm @ 15A, 10V provides comparable switching performance.
FDD8876 (onsemi, Obsolete): 73A continuous drain current. PowerTrench® series. ROHS3 compliant. Exceeds current specification with improved thermal performance (70W Tc).

For Higher Current Capability:

STD150N3LLH6 (STMicroelectronics, Obsolete): 80A continuous drain current. DeepGATE™/STripFET™ VI series. Superior on-resistance of 2.8mOhm @ 40A, 10V. ROHS3 compliant.
STD100N3LF3 (STMicroelectronics, Obsolete): 80A continuous drain current. STripFET™ II series. ROHS3 compliant. On-resistance of 5.5mOhm @ 40A, 10V.

All substitute parts maintain TO-252-3 (DPAK) package compatibility, ±20V gate voltage rating, and -55°C to 175°C operating temperature range. All listed substitutes are ROHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can IPD090N03LGATMA1 replace IRLR8721PBF in all applications?

A: IPD090N03LGATMA1 has a 40A continuous drain current rating compared to IRLR8721PBF's 65A. Substitution is valid only for applications where the actual operating current does not exceed 40A. Verify circuit current requirements before selection.

Q: What is the difference between Tc and Ta current ratings?

A: Tc (case temperature) represents continuous drain current at 25°C case temperature. Ta (ambient temperature) represents continuous drain current at 25°C ambient temperature. Tc ratings are typically higher and represent the device's maximum capability under controlled thermal conditions.

Q: Why does STD70NS04ZL have 33V Vdss instead of 30V?

A: STD70NS04ZL is rated for 33V Vdss, which exceeds the 30V requirement of IRLR8721PBF. This higher voltage rating provides additional safety margin in circuits designed for 30V operation and does not create incompatibility.

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

A: Yes. All listed substitute parts use TO-252-3 (DPAK) surface mount package with identical pinout and mechanical dimensions. PCB layout compatibility is maintained without modification.

Q: What does "Last Time Buy" status mean for FDD6670A?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this product. Limited inventory remains available for purchase. For new designs requiring long-term availability, select Active status parts such as IPD090N03LGATMA1 or STD70NS04ZL.

Q: How do gate charge differences affect circuit design?

A: Gate charge (Qg) determines the energy required to switch the MOSFET. IRLR8721PBF requires 13nC @ 4.5V. Substitutes with higher Qg values (e.g., FDD8876 at 47nC) require higher gate drive current or longer switching times. Verify gate driver capability before substitution.

Q: Can I use a substitute with lower on-resistance (Rds On)?

A: Yes. Lower on-resistance reduces conduction losses and heat generation. Substitutes with lower Rds On values (e.g., STD150N3LLH6 at 2.8mOhm) provide improved efficiency. This is a beneficial substitution from a thermal and power dissipation perspective.

Q: What is the significance of Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. All listed parts maintain MSL 1 rating, ensuring identical handling and storage procedures.

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