AOT472 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The AOT472 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 75V drain-to-source voltage with 10A continuous drain current (Ta) and 140A (Tc). The device is housed in a TO-220-3 through-hole package and is designed for general-purpose switching and amplification applications. The AOT472 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	75	V
Continuous Drain Current @ 25°C (Ta)	10	A
Continuous Drain Current @ 25°C (Tc)	140	A
On-State Resistance (Rds On) @ 30A, 10V	8.9	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	3.9	V
Gate Charge (Qg) @ 10V	115	nC
Input Capacitance (Ciss) @ 30V	4500	pF
Power Dissipation (Tc)	417	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the AOT472 is determined by the following critical parameters:

Voltage Rating Compatibility: The substitute must have a Vdss rating equal to or greater than 75V to ensure safe operation under the same voltage conditions.

Current Handling Capability: The substitute must support continuous drain current (Tc) of at least 140A to maintain equivalent thermal performance and current capacity.

On-State Resistance (Rds On): The substitute should have Rds On values within acceptable range (approximately 7–11 mOhm @ 10V) to ensure comparable power dissipation and switching efficiency.

Package and Mounting: All substitutes must use TO-220-3 through-hole packaging to ensure mechanical and electrical compatibility with existing PCB layouts.

Gate Charge and Input Capacitance: These parameters affect switching speed and gate drive requirements. Substitutes with similar or lower values maintain compatible gate drive characteristics.

Operating Temperature Range: The substitute must support the full -55°C to 175°C operating range to ensure reliability across all application conditions.

Substitutes are grouped into two categories:

Category A – Direct Voltage/Current Match (75V, 140A): Parts that maintain the exact voltage rating and high current capacity of the AOT472.

Category B – Reduced Voltage or Current (60V, 45–100A): Parts with lower voltage or current ratings suitable for applications with reduced electrical stress requirements.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ Tc (A)	Rds On (mOhm)	Qg (nC)	Ciss (pF)	Pd @ Tc (W)	Status
AOT472	Alpha & Omega	75	140	8.9	115	4500	417	Obsolete
IRF3808PBF	Infineon	75	140	7.0	220	5310	330	Active
IRF2807ZPBF	Infineon	75	75	9.4	110	3270	170	Active
FDP75N08A	onsemi	75	75	11.0	104	4468	137	Obsolete
AOT288L	Alpha & Omega	80	46	9.2	38	1871	93.5	Active
CSD18534KCS	Texas Instruments	60	100	9.5	24	1880	107	Active
DMNH6008SCTQ	Diodes Inc.	60	130	8.0	21	2596	210	Active
IRF1010EZPBF	Infineon	60	75	8.5	86	2810	140	Active
IRF1010NPBF	Infineon	55	85	11.0	120	3210	180	Not For New Designs
IPP45N06S4L08AKSA1	Infineon	60	45	8.2	64	4780	71	Discontinued
IRF60B217	International Rectifier	60	60	9.0	66	2230	83	Obsolete

Engineering Selection Recommendations

Primary Substitute – IRF3808PBF: The IRF3808PBF is the optimal substitute for the AOT472. It maintains identical voltage (75V) and current (140A) ratings, ensuring full electrical compatibility. The IRF3808PBF features lower on-state resistance (7.0 mOhm vs. 8.9 mOhm), resulting in improved efficiency and reduced power dissipation. The device is manufactured by Infineon Technologies and holds Active product status with RoHS3 compliance, ensuring long-term availability and regulatory compliance. The TO-220-3 package provides direct mechanical compatibility.

Secondary Substitute – IRF2807ZPBF: The IRF2807ZPBF is suitable for applications where the 140A current requirement can be reduced to 75A. It maintains the 75V voltage rating and offers comparable on-state resistance (9.4 mOhm). This device is Active and RoHS3 compliant. The lower gate charge (110 nC vs. 115 nC) and reduced input capacitance (3270 pF vs. 4500 pF) provide faster switching characteristics.

Alternative for Reduced Voltage Applications – CSD18534KCS: The CSD18534KCS from Texas Instruments is suitable for applications operating at 60V or lower. It supports 100A continuous drain current (Tc) and features the lowest gate charge (24 nC) among all substitutes, enabling faster switching. The device is Active and RoHS3 compliant. The NexFET™ series designation indicates advanced technology. This substitute is appropriate only when the 75V rating is not required.

Alternative for High Current at Reduced Voltage – DMNH6008SCTQ: The DMNH6008SCTQ from Diodes Incorporated supports 130A continuous drain current at 60V, making it suitable for high-current applications with reduced voltage requirements. The device is AEC-Q101 qualified for automotive applications and is Active with RoHS3 compliance. The lowest on-state resistance (8.0 mOhm) among 60V alternatives provides excellent efficiency.

Not Recommended – Obsolete and Discontinued Parts: FDP75N08A (onsemi, Obsolete), IRF1010NPBF (Infineon, Not For New Designs), IPP45N06S4L08AKSA1 (Infineon, Discontinued), and IRF60B217 (International Rectifier, Obsolete) should not be selected for new designs due to their discontinued or obsolete status. These parts present long-term supply and support risks.

Frequently Asked Questions (FAQ)

Q: Can the IRF3808PBF directly replace the AOT472 without circuit modifications?

A: Yes. The IRF3808PBF maintains identical voltage (75V) and current (140A) ratings, operates across the same temperature range (-55°C to 175°C), and uses the same TO-220-3 package. The lower on-state resistance (7.0 mOhm vs. 8.9 mOhm) results in improved performance without requiring circuit changes.

Q: What is the difference between the IRF3808PBF and IRF2807ZPBF?

A: Both devices are rated for 75V operation. The IRF3808PBF supports 140A continuous drain current (matching the AOT472), while the IRF2807ZPBF supports 75A. The IRF3808PBF has higher gate charge (220 nC vs. 110 nC) and input capacitance (5310 pF vs. 3270 pF), requiring more gate drive power but providing higher current capacity. Select IRF3808PBF for full current compatibility; select IRF2807ZPBF for reduced current applications with faster switching.

Q: Can I use a 60V-rated MOSFET in place of the 75V AOT472?

A: No. Using a 60V-rated device in a 75V application violates the voltage rating and creates risk of device failure. The 60V substitutes (CSD18534KCS, DMNH6008SCTQ, IRF1010EZPBF) are suitable only for applications confirmed to operate at 60V or lower.

Q: What is the significance of the TO-220-3 package specification?

A: The TO-220-3 package is a three-terminal through-hole package with standardized pin spacing and mounting hole dimensions. All recommended substitutes use this package, ensuring mechanical compatibility with existing PCB layouts, heatsink mounting arrangements, and connector interfaces. Package compatibility eliminates the need for PCB redesign.

Q: Why does the CSD18534KCS have lower gate charge than the AOT472?

A: Gate charge (Qg) is determined by the internal capacitance of the MOSFET die and the gate drive circuit design. The CSD18534KCS uses advanced NexFET™ technology that reduces internal capacitance, resulting in lower gate charge (24 nC vs. 115 nC). Lower gate charge enables faster switching and reduces gate drive power requirements, but this device operates at 60V, not 75V.

Q: Is the AOT288L a suitable substitute for the AOT472?

A: The AOT288L is not a direct substitute. While both are Alpha & Omega devices in TO-220-3 packages, the AOT288L is rated for 80V and only 46A continuous drain current (Tc), compared to the AOT472's 75V and 140A. The AOT288L is suitable only for applications with significantly reduced current requirements. The AOT288L is Active and RoHS3 compliant, making it appropriate for new designs with lower current specifications.

Q: What does "Product Status: Active" mean for substitute selection?

A: Active status indicates the manufacturer continues production and supports the device for new designs. Active devices have guaranteed long-term availability, ongoing technical support, and compliance with current regulatory standards (RoHS3). Obsolete or discontinued devices present supply chain risk and should not be selected for new designs.

Q: Are all recommended substitutes RoHS3 compliant?

A: The primary and secondary substitutes (IRF3808PBF, IRF2807ZPBF) and most alternatives (CSD18534KCS, DMNH6008SCTQ, IRF1010EZPBF) are RoHS3 compliant. IRF1010NPBF is RoHS3 compliant but is marked "Not For New Designs." Obsolete parts (FDP75N08A, IRF60B217) have varying compliance status. For new designs, select only Active, RoHS3-compliant devices.

Q: How do I determine which substitute is appropriate for my application?

A: Identify the maximum voltage and current requirements of your circuit. If your application requires 75V and up to 140A, select IRF3808PBF. If current can be reduced to 75A at 75V, select IRF2807ZPBF. If your application operates at 60V or lower, select CSD18534KCS (100A), DMNH6008SCTQ (130A), or IRF1010EZPBF (75A) based on current requirements. Verify gate drive voltage compatibility (all substitutes accept ±20V or ±16V gate voltage) and confirm thermal management capability through power dissipation calculations.

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