AON7232 N-Channel MOSFET 100V 37A Equivalent & Substitute Parts

Part Overview

The AON7232 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 100V drain-to-source voltage with 37A continuous drain current at 25°C. The device is housed in an 8-DFN-EP (3.3x3.3) surface mount package and dissipates up to 39W at the case temperature. The AON7232 carries a product status of "Not For New Designs," necessitating identification of equivalent and substitute components for ongoing applications and new design implementations. Suitable alternatives must maintain compatibility across critical electrical parameters including voltage rating, current capacity, gate charge characteristics, and thermal performance while accommodating the specified package form factor.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	100	V
Continuous Drain Current (Id) @ 25°C	37	A (Tc)
On-Resistance (Rds On) @ 12A, 10V	13.5	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.5	V
Gate Charge (Qg) @ 10V	40	nC
Power Dissipation (Max)	39	W (Tc)
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	8-DFN-EP (3.3x3.3)	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AON7232 is determined by the following critical parameters:

Voltage Rating Compatibility: All substitute parts must maintain a minimum drain-to-source voltage (Vdss) rating of 100V to ensure safe operation within the original design envelope.

Current Capacity: Substitute parts must support continuous drain current (Id) ratings sufficient for the application. The AON7232 specifies 37A at case temperature (Tc). Substitutes with lower Tc ratings but equivalent or higher Ta ratings may be acceptable depending on thermal management design.

On-Resistance (Rds On): The AON7232 exhibits 13.5 mOhm at 12A and 10V gate-source voltage. Substitute parts with comparable or lower on-resistance values maintain equivalent or improved power efficiency.

Gate Charge (Qg): The AON7232 specifies 40 nC at 10V. Gate charge directly impacts switching speed and driver circuit requirements. Substitutes with similar or lower gate charge values ensure compatible gate drive performance.

Package Form Factor: The AON7232 uses an 8-DFN-EP (3.3x3.3) package. Substitutes must employ compatible surface mount packages to ensure PCB layout compatibility.

Thermal Performance: Power dissipation ratings and operating temperature ranges must align with application requirements.

Compliance Status: All substitute parts must maintain ROHS3 compliance and equivalent regulatory certifications.

Parameter Comparison

Parameter	AON7232	AONR66922	FDMC86160	FDMC86160ET100	FDMC86320
Manufacturer	Alpha & Omega	Alpha & Omega	onsemi	onsemi	onsemi
Vdss (V)	100	100	100	100	80
Id @ 25°C (A, Tc)	37	50	43	43	22
Rds On (mOhm) @ Vgs 10V	13.5 @ 12A	9 @ 15A	14 @ 9A	14 @ 9A	11.7 @ 10.7A
Vgs(th) (V) @ 250µA	2.5	2.5	4	4	4.5
Gate Charge Qg (nC) @ 10V	40	46	22	22	41
Power Dissipation (W, Tc)	39	52	54	65	40
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 175	-55 to 150
Package	8-DFN-EP (3.3x3.3)	8-DFN-EP (3.3x3.3)	Power33	Power33	8-MLP (3.3x3.3)
Product Status	Not For New Designs	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AONR66922 (Alpha & Omega Semiconductor Inc.)

The AONR66922 is the manufacturer-recommended primary substitute for the AON7232. Both devices are manufactured by Alpha & Omega Semiconductor Inc. and share identical voltage ratings (100V Vdss), gate threshold voltage (2.5V @ 250µA), and package form factor (8-DFN-EP 3.3x3.3). The AONR66922 delivers superior continuous drain current performance at 50A (Tc) compared to the AON7232's 37A, with improved on-resistance of 9 mOhm at 15A versus 13.5 mOhm. The AONR66922 carries an Active product status and ROHS3 compliance, making it suitable for new design implementations. Gate charge is marginally higher at 46 nC versus 40 nC, requiring verification of gate driver capability in high-frequency switching applications. The AONR66922 is available in high inventory (15,834 pieces).

FDMC86160ET100 (onsemi)

The FDMC86160ET100 is an onsemi PowerTrench® device maintaining 100V Vdss rating with 43A continuous drain current (Tc). This part offers the widest operating temperature range (-55°C to 175°C) among all substitutes, providing enhanced thermal margin for demanding applications. The 14 mOhm on-resistance at 9A is comparable to the AON7232. Gate charge of 22 nC is significantly lower, reducing gate driver stress and enabling faster switching transitions. The Power33 package differs from the original 8-DFN-EP form factor, requiring PCB layout modification. The FDMC86160ET100 is packaged in Tape & Reel format and carries Active product status with ROHS3 compliance. Inventory availability is limited (2,263 pieces).

FDMC86160 (onsemi)

The FDMC86160 is an onsemi PowerTrench® device with identical electrical specifications to the FDMC86160ET100 but supplied in Cut Tape & Digi-Reel® packaging. It maintains 100V Vdss and 43A continuous drain current (Tc) with 14 mOhm on-resistance. Operating temperature range is -55°C to 150°C, matching the AON7232. Gate charge of 22 nC provides switching performance advantages. The Power33 package requires PCB layout modification. The FDMC86160 carries Active product status and ROHS3 compliance with higher inventory availability (9,829 pieces).

FDMC86320 (onsemi)

The FDMC86320 is an onsemi PowerTrench® device with reduced voltage rating of 80V Vdss, making it unsuitable as a direct substitute for 100V applications. This part is included in the substitute list but does not meet the voltage compatibility requirement for the AON7232. The FDMC86320 is appropriate only for applications with maximum operating voltages below 80V.

Frequently Asked Questions (FAQ)

Q: Can the AONR66922 directly replace the AON7232 without PCB modifications?

A: Yes. The AONR66922 shares the identical 8-DFN-EP (3.3x3.3) package footprint with the AON7232, enabling direct PCB substitution without layout changes. Both devices are manufactured by Alpha & Omega Semiconductor Inc. and maintain compatible pinout and thermal pad configurations.

Q: What is the significance of the gate charge difference between the AON7232 (40 nC) and FDMC86160 (22 nC)?

A: Gate charge directly determines the energy required to switch the MOSFET on and off. The FDMC86160's lower gate charge of 22 nC reduces gate driver power consumption and enables faster switching transitions compared to the AON7232's 40 nC. Gate drivers must be verified to support the lower charge requirement without introducing instability.

Q: Why does the FDMC86320 appear in the substitute list if its voltage rating is only 80V?

A: The FDMC86320 is listed as a substitute option for applications where the design voltage requirement is 80V or lower. For applications requiring the full 100V rating of the AON7232, the FDMC86320 is not suitable and must not be selected.

Q: What are the package compatibility implications of selecting FDMC86160 or FDMC86160ET100?

A: Both onsemi devices use the Power33 package, which differs from the AON7232's 8-DFN-EP form factor. Power33 package substitution requires PCB layout modification including new footprint design, trace routing adjustments, and thermal pad reconfiguration. Mechanical fit verification is mandatory before production implementation.

Q: Is the AONR66922 suitable for new design implementations?

A: Yes. The AONR66922 carries an Active product status, indicating full manufacturer support and availability for new designs. The AON7232's "Not For New Designs" status makes the AONR66922 the recommended choice for new applications requiring equivalent performance.

Q: How do the continuous drain current ratings affect substitution decisions?

A: The AON7232 specifies 37A at case temperature (Tc). The AONR66922 (50A Tc), FDMC86160 (43A Tc), and FDMC86160ET100 (43A Tc) all exceed this requirement, providing design margin. The FDMC86320 (22A Tc) falls below the AON7232 rating and is unsuitable for applications requiring the full 37A capacity.

Q: What compliance certifications are maintained across all substitute parts?

A: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the AON7232's regulatory certifications. All devices carry EAR99 ECCN classification and identical HTSUS codes (8541.29.0095), ensuring consistent export and supply chain compliance.

Q: Does the extended temperature range of FDMC86160ET100 (-55°C to 175°C) provide advantages over other substitutes?

A: The FDMC86160ET100's extended upper operating temperature limit of 175°C provides additional thermal margin compared to alternatives rated to 150°C. This advantage is application-specific and relevant only for designs operating near maximum junction temperature limits. Thermal management design must be evaluated independently.

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