AOD446 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The AOD446 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 75V drain-to-source voltage with 10A continuous drain current in a surface mount TO-252 (DPAK) package. This device is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, production continuity, and component sourcing.

Substitute parts listed in this reference are selected based on matching electrical characteristics within acceptable operating parameters and identical mechanical packaging, ensuring functional compatibility in existing circuit designs.

Key Parameters

Parameter	AOD446 Specification
Drain-to-Source Voltage (Vdss)	75 V
Continuous Drain Current (Id) @ 25°C	10 A (Tc)
On-State Resistance (Rds On Max)	130 mOhm @ 5A, 20V
Gate Threshold Voltage (Vgs(th) Max)	3 V @ 250 µA
Gate Charge (Qg Max)	6.5 nC @ 10 V
Power Dissipation (Max)	2.1 W (Ta), 20 W (Tc)
Operating Temperature Range	-55°C to 175°C (TJ)
Package Type	TO-252 (DPAK)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the AOD446 is determined by the following critical parameters:

Voltage Rating Compatibility: Substitute parts must maintain a Vdss rating equal to or greater than 75V to ensure safe operation under maximum voltage stress conditions.

Current Handling Capability: Substitute parts must support continuous drain current (Id) at or above 10A to meet load requirements without thermal derating.

On-State Resistance (Rds On): Substitute parts must maintain comparable or lower on-state resistance to preserve switching efficiency and minimize power dissipation in the application circuit.

Gate Drive Characteristics: Substitute parts must operate within compatible gate threshold voltage (Vgs(th)) and gate charge (Qg) ranges to ensure proper gate drive circuit compatibility.

Thermal Performance: Substitute parts must support equivalent or superior power dissipation ratings to maintain thermal stability under continuous operation.

Package and Pinout: All substitute parts must use identical TO-252 (DPAK) surface mount packaging with matching pin configuration to ensure direct PCB compatibility without layout modifications.

Operating Temperature Range: Substitute parts must support the full -55°C to 175°C operating temperature range or equivalent to maintain performance across all environmental conditions.

Parameter Comparison

Parameter	AOD446	AOD2922	FQD13N06LTM	IRFR020TRPBF	ZXMN7A11KTC
Manufacturer	Alpha & Omega	Alpha & Omega	onsemi	Vishay Siliconix	Diodes Inc.
Vdss (V)	75	100	60	60	70
Id @ 25°C (A)	10 (Tc)	7 (Tc)	11 (Tc)	14 (Tc)	4.2 (Ta)
Rds On Max (mOhm)	130 @ 5A, 20V	140 @ 5A, 10V	115 @ 5.5A, 10V	100 @ 8.4A, 10V	130 @ 4.4A, 10V
Vgs(th) Max (V)	3 @ 250 µA	2.7 @ 250 µA	2.5 @ 250 µA	4 @ 250 µA	1 @ 250 µA
Qg Max (nC)	6.5 @ 10V	10 @ 10V	6.4 @ 5V	25 @ 10V	7.4 @ 10V
Ciss Max (pF)	350 @ 30V	310 @ 50V	350 @ 25V	640 @ 25V	298 @ 40V
Power Dissipation Max (W)	2.1 (Ta), 20 (Tc)	5 (Ta), 17 (Tc)	2.5 (Ta), 28 (Tc)	2.5 (Ta), 42 (Tc)	2.11 (Ta)
Operating Temp Range (°C)	-55 to 175	-55 to 175	-55 to 150	-55 to 150	-55 to 150
Package	TO-252 (DPAK)	TO-252 (DPAK)	TO-252AA (DPAK)	DPAK	TO-252-3 (DPAK)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Compliance	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AOD2922 (Alpha & Omega Semiconductor Inc.)

The AOD2922 is an active product with ROHS3 compliance and identical operating temperature range (-55°C to 175°C). It features a higher Vdss rating of 100V, providing enhanced voltage margin over the AOD446's 75V specification. The 7A continuous drain current (Tc) is lower than the AOD446's 10A rating. This substitute is suitable for applications where voltage headroom is prioritized and current requirements do not exceed 7A. The AOD2922 maintains comparable on-state resistance and gate charge characteristics.

FQD13N06LTM (onsemi)

The FQD13N06LTM is an active QFET series product with ROHS3 compliance. It provides 11A continuous drain current, exceeding the AOD446's 10A specification, with a lower Vdss rating of 60V. The on-state resistance of 115 mOhm is superior to the AOD446's 130 mOhm, resulting in reduced power dissipation. Operating temperature range is -55°C to 150°C, which is 25°C lower than the AOD446. This substitute is applicable for applications operating within the reduced temperature range where current capacity and efficiency are critical.

IRFR020TRPBF (Vishay Siliconix)

The IRFR020TRPBF is an active product with ROHS3 compliance, offering 14A continuous drain current and 60V Vdss rating. It provides the lowest on-state resistance at 100 mOhm, delivering superior efficiency compared to the AOD446. Gate charge is elevated at 25 nC, requiring higher gate drive capability. Operating temperature range is -55°C to 150°C. This substitute is suitable for high-current applications where efficiency is paramount and gate drive circuitry can accommodate the increased charge requirement.

ZXMN7A11KTC (Diodes Incorporated)

The ZXMN7A11KTC is an active product with ROHS3 compliance and a 70V Vdss rating, closely matching the AOD446's 75V specification. Continuous drain current is 4.2A (Ta), significantly lower than the AOD446's 10A rating. On-state resistance is 130 mOhm, matching the AOD446 specification. Operating temperature range is -55°C to 150°C. This substitute is applicable only for low-current applications where voltage rating proximity is required and current demands are substantially reduced.

Frequently Asked Questions (FAQ)

Q: Can the AOD2922 directly replace the AOD446 in all applications?

A: The AOD2922 is suitable for applications where continuous drain current requirements do not exceed 7A. The higher 100V Vdss rating provides additional voltage margin. If the application requires the full 10A continuous current of the AOD446, the AOD2922 is not a direct replacement. Thermal analysis must confirm that the reduced current rating meets circuit requirements.

Q: What is the primary limitation of the ZXMN7A11KTC as a substitute?

A: The ZXMN7A11KTC has a maximum continuous drain current of 4.2A, which is significantly below the AOD446's 10A specification. This part is suitable only for applications with substantially reduced current requirements. It should not be used in designs requiring the full 10A current capacity.

Q: How does the IRFR020TRPBF differ in gate drive requirements?

A: The IRFR020TRPBF has a gate charge (Qg) of 25 nC at 10V, compared to the AOD446's 6.5 nC. This higher gate charge requires greater charge delivery from the gate drive circuit. Existing gate drive circuits designed for the AOD446 must be evaluated to ensure sufficient current and voltage capability to drive the IRFR020TRPBF within acceptable switching times.

Q: Are all substitute parts available in the same TO-252 (DPAK) package?

A: Yes, all substitute parts listed are available in TO-252 (DPAK) surface mount packaging with identical pinout configuration. Direct PCB substitution is possible without layout modifications. Thermal pad connectivity and solder pad dimensions should be verified against specific supplier documentation to ensure optimal thermal performance.

Q: What is the impact of the reduced operating temperature range on FQD13N06LTM and IRFR020TRPBF?

A: Both the FQD13N06LTM and IRFR020TRPBF have a maximum operating temperature of 150°C, compared to the AOD446's 175°C. Applications operating at junction temperatures above 150°C require thermal derating or selection of alternative parts. The AOD2922 maintains the full -55°C to 175°C range of the AOD446.

Q: How do on-state resistance differences affect power dissipation?

A: Lower on-state resistance reduces conduction losses. The IRFR020TRPBF at 100 mOhm provides the lowest losses, while the AOD2922 and ZXMN7A11KTC at 140 mOhm and 130 mOhm respectively show minimal difference from the AOD446's 130 mOhm. Power dissipation impact is proportional to the square of drain current; applications with high continuous current benefit most from lower Rds On values.

Q: Can gate threshold voltage differences affect circuit operation?

A: Gate threshold voltage (Vgs(th)) variations affect gate drive circuit design. The ZXMN7A11KTC has the lowest threshold at 1V, while the IRFR020TRPBF has the highest at 4V. Gate drive circuits must provide sufficient voltage margin above the threshold to ensure full enhancement and minimize on-state resistance. Existing gate drive designs should be verified for compatibility with substitute part thresholds.

Q: What compliance certifications are relevant for substitute part selection?

A: All substitute parts carry ROHS3 compliance certification, ensuring compatibility with environmental and regulatory requirements. The AOD446 status is not specified for RoHS compliance. All parts are classified as REACH Unaffected and carry EAR99 export classification. Procurement specifications should confirm that selected substitutes meet applicable compliance requirements for the target application and market.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message