AOT424 N-Channel 30V 110A MOSFET Equivalent & Substitute Parts

Part Overview

The AOT424 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 110A continuous drain current at 25°C (Tc) and 100W power dissipation. The device is housed in a TO-220 through-hole package and is classified as obsolete product status.

Due to its obsolete classification, direct replacement with functionally equivalent alternatives is necessary for new designs and ongoing production support. Substitute parts listed below maintain electrical compatibility within the specified parameter ranges while offering improved availability and, in some cases, enhanced performance characteristics.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	110	A (Tc)
Power Dissipation (Max)	100	W (Tc)
Rds On (Max) @ Id, Vgs	4	mOhm @ 30A, 10V
Gate Threshold Voltage (Vgs(th)) @ Id	3	V @ 250µA
Gate Charge (Qg) @ Vgs	72	nC @ 10V
Input Capacitance (Ciss) @ Vds	4400	pF @ 15V
Operating Temperature Range	−55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package	TO-220-3	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the AOT424 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Drain-to-Source Voltage (Vdss): 30V minimum
Continuous Drain Current (Id): 110A or greater at 25°C (Tc)
Mounting Type: Through Hole
Package: TO-220 or TO-220-3 compatible footprint
Operating Temperature Range: −55°C to 175°C (TJ) minimum
Gate Threshold Voltage (Vgs(th)): Within ±20V maximum gate voltage specification

Performance Considerations:

Rds On (Max): Lower values indicate improved efficiency; values at or below 4.8 mOhm maintain thermal performance parity
Power Dissipation: 100W or greater ensures thermal headroom
Gate Charge (Qg): Lower values reduce switching losses; 72 nC or less preferred
Input Capacitance (Ciss): Lower values reduce gate drive requirements

All substitute parts listed maintain the 30V Vdss rating and support continuous drain currents of 110A or greater, ensuring direct functional replacement in existing circuit designs. Package compatibility is confirmed for all listed alternatives.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A, Tc)	Rds On (mOhm)	Qg (nC)	Ciss (pF)	Pd (W, Tc)	Package	Product Status
AOT424	Alpha & Omega Semiconductor Inc.	30	110	4.0 @ 30A, 10V	72 @ 10V	4400 @ 15V	100	TO-220-3	Obsolete
FDP8874	onsemi	30	114	5.3 @ 40A, 10V	72 @ 10V	3130 @ 15V	110	TO-220-3	Obsolete
IPP042N03LGXKSA1	Infineon Technologies	30	70	4.2 @ 30A, 10V	38 @ 10V	3900 @ 15V	79	TO-220-3	Not For New Designs
IRL7833PBF	Infineon Technologies	30	150	3.8 @ 38A, 10V	47 @ 4.5V	4170 @ 15V	140	TO-220-3	Not For New Designs
IRLB8743PBF	Infineon Technologies	30	78	3.2 @ 40A, 10V	54 @ 4.5V	5110 @ 15V	140	TO-220-3	Active
IRLB8748PBF	Infineon Technologies	30	92	4.8 @ 40A, 10V	23 @ 4.5V	2139 @ 15V	75	TO-220-3	Active
PSMN3R4-30PL,127	Nexperia USA Inc.	30	100	3.4 @ 10A, 10V	64 @ 10V	3907 @ 12V	114	TO-220-3	Obsolete
PSMN4R3-30PL,127	Nexperia USA Inc.	30	100	4.3 @ 15A, 10V	41.5 @ 10V	2400 @ 12V	103	TO-220-3	Obsolete
STP200NF03	STMicroelectronics	30	120	3.6 @ 60A, 10V	140 @ 10V	4950 @ 25V	300	TO-220-3	Not For New Designs

Engineering Selection Recommendations

For Active Product Status (Recommended for New Designs):

IRLB8743PBF and IRLB8748PBF are classified as Active products, indicating ongoing manufacturer support and availability. Both devices are manufactured by Infineon Technologies and carry RoHS3 compliance certification. IRLB8743PBF provides 78A continuous drain current with superior Rds On performance (3.2 mOhm), while IRLB8748PBF delivers 92A continuous drain current with moderate Rds On (4.8 mOhm) and significantly reduced gate charge (23 nC), resulting in lower switching losses.

For Equivalent Current Rating (110A or Greater):

FDP8874 (onsemi) and STP200NF03 (STMicroelectronics) both exceed the AOT424 current specification. FDP8874 provides 114A at comparable power dissipation (110W) with reduced input capacitance. STP200NF03 delivers 120A continuous current with substantially higher power dissipation capability (300W), suitable for high-thermal-load applications.

For Direct Current Matching (100A):

PSMN3R4-30PL,127 and PSMN4R3-30PL,127 (Nexperia USA Inc.) both provide 100A continuous drain current, closely matching the AOT424 specification. PSMN3R4-30PL,127 exhibits superior Rds On performance (3.4 mOhm) and higher power dissipation (114W). Both devices carry RoHS3 compliance.

Compliance and Certification:

All substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the AOT424. Moisture Sensitivity Level 1 (Unlimited) is uniform across all alternatives. RoHS3 compliance is confirmed for all active and not-for-new-designs status parts.

Frequently Asked Questions (FAQ)

Q: Can the AOT424 be directly replaced with any of the listed substitute parts?

A: Direct replacement is possible only when the substitute part meets or exceeds the AOT424 specifications for Vdss (30V), continuous drain current (110A), and operating temperature range (−55°C to 175°C). Parts with lower current ratings (IPP042N03LGXKSA1 at 70A, IRLB8743PBF at 78A, IRLB8748PBF at 92A) are suitable only if circuit design permits operation at reduced current levels. Thermal design must account for differences in power dissipation and Rds On characteristics.

Q: What is the significance of Rds On variation among substitute parts?

A: Rds On (on-state resistance) directly affects power dissipation and thermal performance. Lower Rds On values reduce I²R losses during conduction. The AOT424 specifies 4 mOhm at 30A, 10V. Substitutes with lower Rds On (such as PSMN3R4-30PL,127 at 3.4 mOhm or IRL7833PBF at 3.8 mOhm) improve efficiency and reduce heat generation. Substitutes with higher Rds On (such as FDP8874 at 5.3 mOhm) require thermal margin verification in existing designs.

Q: Are all substitute parts available in the same TO-220 package?

A: All substitute parts are housed in TO-220-3 or TO-220AB packages, which are mechanically and electrically compatible with the AOT424 TO-220-3 footprint. Pin configuration and lead spacing are identical, permitting direct PCB mounting without layout modification.

Q: What is the difference between product status classifications (Obsolete, Not For New Designs, Active)?

A: Obsolete parts have reached end-of-life and are no longer manufactured; existing inventory only. Not For New Designs parts are still available but manufacturers recommend against use in new circuit development. Active parts are currently manufactured and supported, with guaranteed long-term availability. For new designs, IRLB8743PBF and IRLB8748PBF (both Active) are preferred.

Q: How does gate charge (Qg) affect circuit performance?

A: Gate charge determines the energy required to switch the MOSFET on and off. Lower Qg values reduce gate drive power consumption and enable faster switching transitions. The AOT424 specifies 72 nC at 10V. IRLB8748PBF (23 nC at 4.5V) and IPP042N03LGXKSA1 (38 nC at 10V) offer significantly reduced gate charge, improving switching efficiency in high-frequency applications. STP200NF03 (140 nC at 10V) requires higher gate drive capability.

Q: What thermal considerations apply when substituting the AOT424?

A: Power dissipation varies significantly among substitutes. The AOT424 is rated for 100W (Tc). STP200NF03 provides 300W dissipation capability, permitting higher current operation or reduced heatsink requirements. Conversely, IRLB8748PBF is rated for only 75W, requiring thermal design verification if the original design operated near the 100W limit. Rds On differences also affect thermal performance; lower Rds On values reduce conduction losses.

Q: Are RoHS and REACH compliance requirements met by all substitutes?

A: All substitute parts carry REACH Unaffected status and EAR99 export classification, matching the AOT424. RoHS3 compliance is confirmed for all active and not-for-new-designs status parts (FDP8874, IPP042N03LGXKSA1, IRL7833PBF, IRLB8743PBF, IRLB8748PBF, PSMN3R4-30PL,127, PSMN4R3-30PL,127, STP200NF03). Moisture Sensitivity Level 1 (Unlimited) is uniform across all alternatives.

Q: Which substitute part provides the best overall performance match to the AOT424?

A: PSMN3R4-30PL,127 provides the closest electrical match: 100A continuous drain current (versus 110A), superior Rds On (3.4 mOhm), comparable gate charge (64 nC), and higher power dissipation (114W). However, this part is classified as Obsolete. For active product status with strong performance characteristics, IRLB8743PBF offers 78A current with excellent Rds On (3.2 mOhm) and 140W power dissipation, or IRLB8748PBF provides 92A current with reduced gate charge (23 nC) for switching-loss-sensitive applications.

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