AON7444 Equivalent & Substitute Parts

Part Overview

The AON7444 is an N-Channel MOSFET rated for 60V drain-to-source voltage with continuous drain current of 9A (Ta) and 33A (Tc). This device is packaged in a Surface Mount 8-DFN-EP (3x3) configuration and is part of the SDMOS™ series from Alpha & Omega Semiconductor Inc. The AON7444 is classified as Obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	9A (Ta), 33A (Tc)	A
Rds On (Max) @ Id, Vgs	22 mOhm @ 9A, 10V	mOhm
Gate Threshold Voltage (Vgs(th)) @ Id	2.6V @ 250µA	V
Gate Charge (Qg) @ Vgs	34 nC @ 10V	nC
Input Capacitance (Ciss) @ Vds	2000 pF @ 30V	pF
Power Dissipation (Max)	3.1W (Ta), 42W (Tc)	W
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package	8-DFN-EP (3x3)	—

Substitute Part Grouping Explanation

Substitution of the AON7444 is based on strict electrical and mechanical parameter compatibility within the N-Channel MOSFET category. The following parameters define acceptable substitutes:

Critical Matching Parameters:

Drain to Source Voltage (Vdss): Must equal or exceed 60V
Package Type: Must be 8-DFN-EP (3x3) Surface Mount
Operating Temperature Range: Must support -55°C to 150°C (TJ)
Gate Voltage Rating (Vgs Max): Must support ±20V

Performance Parameters for Substitution:

Continuous Drain Current (Id): Substitute must meet or exceed the application requirement
On-State Resistance (Rds On): Lower values indicate improved performance
Gate Charge (Qg): Lower values reduce switching losses
Input Capacitance (Ciss): Lower values reduce gate drive requirements

The AON7246E qualifies as a direct substitute based on matching voltage rating, package configuration, temperature range, and gate voltage specifications. The AON7246E provides improved electrical characteristics including lower on-state resistance and reduced gate charge.

Parameter Comparison

Parameter	AON7444	AON7246E	Unit
Drain to Source Voltage (Vdss)	60	60	V
Continuous Drain Current (Id) @ 25°C	9A (Ta), 33A (Tc)	13A (Ta)	A
Rds On (Max) @ Id, Vgs	22 mOhm @ 9A, 10V	13.2 mOhm @ 13A, 10V	mOhm
Gate Threshold Voltage (Vgs(th)) @ Id	2.6V @ 250µA	2.2V @ 250µA	V
Gate Charge (Qg) @ Vgs	34 nC @ 10V	10 nC @ 4.5V	nC
Input Capacitance (Ciss) @ Vds	2000 pF @ 30V	755 pF @ 30V	pF
Power Dissipation (Max)	3.1W (Ta), 42W (Tc)	24W (Tc)	W
Operating Temperature Range	-55 to 150	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	Surface Mount	—
Package	8-DFN-EP (3x3)	8-DFN-EP (3x3)	—
Vgs (Max)	±20	±20	V

Engineering Selection Recommendations

AON7246E as Primary Substitute:

The AON7246E is the manufacturer-recommended substitute for the obsolete AON7444. Both devices share identical voltage ratings (60V Vdss), package configuration (8-DFN-EP 3x3), and operating temperature range (-55°C to 150°C TJ). The AON7246E is classified as Active product status, ensuring continued availability and manufacturing support.

The AON7246E demonstrates superior electrical characteristics compared to the AON7444:

Lower on-state resistance (13.2 mOhm vs. 22 mOhm at rated conditions)
Reduced gate charge (10 nC vs. 34 nC)
Lower input capacitance (755 pF vs. 2000 pF)
Higher continuous drain current capability (13A Ta vs. 9A Ta)

Compliance and Certifications:

The AON7246E is RoHS3 Compliant and maintains REACH Unaffected status, consistent with the AON7444. Both devices carry EAR99 ECCN classification and identical HTSUS codes (8541.29.0095). Moisture Sensitivity Level (MSL) is 1 (Unlimited) for both parts, indicating no moisture-related handling restrictions.

Mechanical Compatibility:

Pin-to-pin compatibility is maintained through identical 8-DFN-EP (3x3) packaging. PCB layout and thermal management designs developed for the AON7444 are directly applicable to the AON7246E without modification.

Frequently Asked Questions (FAQ)

Q: Can the AON7246E directly replace the AON7444 in existing designs?

A: Yes. The AON7246E is electrically and mechanically compatible with the AON7444. Both devices feature identical 60V Vdss ratings, 8-DFN-EP (3x3) packaging, and -55°C to 150°C operating temperature ranges. No PCB layout modifications are required.

Q: What are the key electrical differences between these parts?

A: The AON7246E provides improved performance characteristics: lower on-state resistance (13.2 mOhm vs. 22 mOhm), reduced gate charge (10 nC vs. 34 nC), and lower input capacitance (755 pF vs. 2000 pF). These improvements result in reduced power dissipation and faster switching response.

Q: Why is the AON7444 classified as Obsolete?

A: The AON7444 is part of the legacy SDMOS™ series. The AON7246E, from the newer AlphaSGT™ series, offers superior performance and has replaced it in the manufacturer's product portfolio.

Q: Are there any thermal management differences between these devices?

A: The AON7246E supports 24W (Tc) maximum power dissipation compared to the AON7444's 42W (Tc). For applications requiring the higher thermal capability of the AON7444, thermal design verification is necessary when transitioning to the AON7246E.

Q: What is the gate charge significance in selecting between these parts?

A: Gate charge (Qg) directly impacts gate drive circuit requirements and switching losses. The AON7246E's lower gate charge (10 nC @ 4.5V vs. 34 nC @ 10V) reduces gate driver power consumption and enables faster switching transitions, improving overall circuit efficiency.

Q: Are both parts available in the same moisture sensitivity classification?

A: Yes. Both the AON7444 and AON7246E carry MSL 1 (Unlimited) classification, indicating no moisture-related handling or storage restrictions.

Q: What compliance standards apply to both devices?

A: Both parts are REACH Unaffected and carry EAR99 ECCN classification. The AON7246E is additionally RoHS3 Compliant. Both share identical HTSUS code 8541.29.0095.

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