AON2240 Equivalent & Substitute Parts

Part Overview

The AON2240 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 40V drain-to-source voltage with 8A continuous drain current at 25°C. This device is housed in a 6-DFN (2x2) surface mount package and is designed for general-purpose switching applications requiring moderate current handling and low on-resistance characteristics. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified to provide design flexibility when the primary part is unavailable, when alternative packaging formats are required, or when enhanced thermal performance characteristics are beneficial for specific application requirements.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	40	V
Continuous Drain Current @ 25°C (Id)	8	A (Ta)
On-Resistance (Rds On) @ 8A, 10V	21	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.4	V
Gate Charge (Qg) @ 10V	12	nC
Input Capacitance (Ciss) @ 20V	415	pF
Power Dissipation (Max)	2.8	W (Ta)
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	6-UDFN Exposed Pad	Surface Mount
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the AON2240 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 40V
Continuous Drain Current (Id) @ 25°C: Must equal or exceed 8A at Ta rating
On-Resistance (Rds On) @ 8A, 10V: Must not exceed 21mOhm to maintain circuit performance
Gate Threshold Voltage (Vgs(th)): Must fall within acceptable switching range (2.4V nominal)
Maximum Gate Voltage (Vgs): Must support ±20V operation
Operating Temperature Range: Must encompass -55°C to 150°C minimum

Mechanical Equivalence Criteria:

Package Type: 6-UDFN Exposed Pad (surface mount)
Mounting Type: Surface mount compatible with standard PCB assembly processes
Pin Configuration: Functionally equivalent pinout for direct substitution

Compliance Criteria:

RoHS3 Compliance: Required
Moisture Sensitivity Level (MSL): Must be MSL 1 or equivalent
REACH Status: Must be REACH Unaffected

The BUK6D23-40EX meets all substitution criteria while offering enhanced thermal performance characteristics through higher continuous drain current rating at Tc and increased power dissipation capability.

Parameter Comparison

Parameter	AON2240	BUK6D23-40EX	Unit
Manufacturer	Alpha & Omega Semiconductor Inc.	Nexperia USA Inc.	—
Drain-to-Source Voltage (Vdss)	40	40	V
Continuous Drain Current @ 25°C (Ta)	8	8	A
Continuous Drain Current @ 25°C (Tc)	—	19	A
On-Resistance (Rds On) @ 8A, 10V	21	23	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.4	2.7	V
Gate Charge (Qg) @ 10V	12	19	nC
Input Capacitance (Ciss) @ 20V	415	582	pF
Power Dissipation (Max) @ Ta	2.8	2.3	W
Power Dissipation (Max) @ Tc	—	15	W
Operating Temperature Range	-55 to 150	-55 to 175	°C (TJ)
Package Type	6-UDFN Exposed Pad	6-UDFN Exposed Pad	—
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	—
Product Status	Active	Active	—
Automotive Grade	—	Yes (AEC-Q101)	—

Engineering Selection Recommendations

AON2240 Selection: The AON2240 is appropriate for applications requiring standard industrial-grade N-Channel MOSFET performance at 40V with 8A continuous drain current. This part is suitable for general switching applications where thermal management is not a primary constraint and operating temperatures remain within the -55°C to 150°C range. The device maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating, ensuring long-term availability and environmental compliance.

BUK6D23-40EX Selection: The BUK6D23-40EX is appropriate for applications requiring automotive-grade qualification (AEC-Q101) or enhanced thermal performance. This substitute part provides identical electrical performance at the 8A Ta rating while offering significantly higher power dissipation capability at Tc (15W versus 2.8W at Ta). The extended operating temperature range (-55°C to 175°C) accommodates high-temperature environments. The BUK6D23-40EX is manufactured by Nexperia USA Inc. under the TrenchMOS™ series designation and maintains Active product status with full RoHS3 compliance.

Both parts are functionally equivalent for direct substitution in 6-UDFN Exposed Pad surface mount applications. Selection between these parts depends on specific application requirements regarding thermal performance, automotive qualification, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the BUK6D23-40EX directly replace the AON2240 in existing designs?

A: Yes. Both devices share identical Vdss (40V), Ta-rated continuous drain current (8A), and package type (6-UDFN Exposed Pad). The pinout is functionally equivalent for direct PCB substitution. However, the BUK6D23-40EX exhibits slightly higher on-resistance (23mOhm versus 21mOhm) and higher gate charge (19nC versus 12nC), which may affect switching speed and power dissipation in high-frequency applications.

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

A: The primary differences are: (1) On-resistance is 2mOhm higher in the BUK6D23-40EX; (2) Gate charge is 7nC higher; (3) Input capacitance is 167pF higher; (4) The BUK6D23-40EX offers automotive-grade qualification (AEC-Q101) and extended temperature range (-55°C to 175°C versus -150°C); (5) The BUK6D23-40EX provides significantly higher power dissipation at Tc (15W versus 2.8W at Ta).

Q: Are there packaging format differences between these parts?

A: Yes. The AON2240 is supplied in Tape & Reel (TR) format, while the BUK6D23-40EX is available in Cut Tape (CT) and Digi-Reel® formats. Both use identical 6-UDFN Exposed Pad surface mount packages, so PCB footprints are identical. Packaging format selection depends on assembly process requirements and volume considerations.

Q: Which part should be selected for automotive applications?

A: The BUK6D23-40EX is qualified to AEC-Q101 automotive standards and is the appropriate choice for automotive applications. The AON2240 does not carry automotive qualification.

Q: How do the thermal characteristics compare?

A: The BUK6D23-40EX provides superior thermal performance with 15W power dissipation at Tc (case temperature) compared to the AON2240's 2.8W at Ta (ambient temperature). The BUK6D23-40EX also supports a higher maximum junction temperature (175°C versus 150°C), making it suitable for high-temperature environments.

Q: Will the higher gate charge of the BUK6D23-40EX affect circuit performance?

A: The BUK6D23-40EX exhibits 7nC higher gate charge (19nC versus 12nC), which may increase switching time and gate drive power requirements. Applications with tight switching speed specifications or high-frequency operation should evaluate this parameter against circuit requirements.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the AON2240 and BUK6D23-40EX are RoHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating and REACH Unaffected status.

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