AON7440 Equivalent & Substitute Parts

Part Overview

The AON7440 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with continuous drain current of 28A at Ta and 50A at Tc. The device is housed in an 8-DFN-EP (3.3x3.3) surface mount package and is designed for power switching applications requiring compact form factors and efficient thermal management.

The AON7440 is classified as Obsolete, necessitating identification of equivalent substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current handling capability, on-resistance characteristics, and thermal performance while accommodating available packaging options.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	28	A
Continuous Drain Current @ 25°C (Tc)	50	A
Rds On (Max) @ 20A, 10V	2.8	mOhm
Gate Charge (Qg) @ 10V	75	nC
Input Capacitance (Ciss) @ 15V	2820	pF
Power Dissipation (Ta)	4.2	W
Power Dissipation (Tc)	42	W
Operating Temperature Range	-55 to 150	°C
Package Type	8-DFN-EP (3.3x3.3)	Surface Mount
Vgs(th) @ 250µA	2.3	V
Vgs (Max)	±20	V

Substitute Part Grouping Explanation

Substitute parts for the AON7440 are selected based on electrical parameter compatibility within the following criteria:

Primary Compatibility Parameters:

Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
Continuous Drain Current: Must support minimum 28A at Ta or equivalent thermal performance at Tc
On-Resistance (Rds On): Lower or equivalent values ensure thermal performance maintenance
Gate Charge (Qg): Lower values reduce switching losses
Operating Temperature Range: Must encompass -55°C to 150°C
Package Type: Surface mount configurations with compatible footprints

Substitution Logic: The FDMC8010 provides superior electrical performance with lower on-resistance (1.3mOhm vs 2.8mOhm) and higher current ratings (30A Ta, 75A Tc), enabling direct substitution with improved thermal characteristics. The NTTFS4C05NTAG and NTTFS4C05NTWG variants offer compatible voltage and temperature ratings with lower gate charge (31nC vs 75nC), reducing switching losses, though with reduced continuous current ratings at Ta (12A vs 28A). These parts maintain the same 30V Vdss rating and operating temperature range.

Parameter Comparison

Parameter	AON7440	FDMC8010	NTTFS4C05NTAG	NTTFS4C05NTWG	Unit
Manufacturer	Alpha & Omega Semiconductor Inc.	onsemi	onsemi	onsemi	—
Drain to Source Voltage (Vdss)	30	30	30	30	V
Continuous Drain Current @ Ta	28	30	12	12	A
Continuous Drain Current @ Tc	50	75	75	75	A
Rds On (Max) @ 10V	2.8 @ 20A	1.3 @ 30A	3.6 @ 30A	3.6 @ 30A	mOhm
Gate Charge (Qg) @ 10V	75	94	31	31	nC
Input Capacitance (Ciss) @ 15V	2820	5860	1988	1988	pF
Power Dissipation @ Ta	4.2	2.4	0.82	0.82	W
Power Dissipation @ Tc	42	54	33	33	W
Operating Temperature Range	-55 to 150	-55 to 150	-55 to 150	-55 to 150	°C
Vgs(th) @ 250µA or 1mA	2.3 @ 250µA	2.5 @ 1mA	2.2 @ 250µA	2.2 @ 250µA	V
Vgs (Max)	±20	±20	±20	±20	V
Package Type	8-DFN-EP (3.3x3.3)	Power33	8-WDFN (3.3x3.3)	8-WDFN (3.3x3.3)	Surface Mount
Product Status	Obsolete	Active	Active	Last Time Buy	—
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	—

Engineering Selection Recommendations

FDMC8010 (onsemi PowerTrench®)

The FDMC8010 is the primary recommended substitute for the AON7440. This part maintains the 30V Vdss rating and exceeds the continuous drain current specification with 30A at Ta and 75A at Tc. The FDMC8010 delivers superior on-resistance performance (1.3mOhm vs 2.8mOhm), resulting in reduced power dissipation and improved thermal efficiency. The device is classified as Active with ROHS3 compliance and REACH Unaffected status, ensuring long-term availability and regulatory alignment. The Power33 package provides equivalent thermal performance to the original 8-DFN-EP package. Inventory availability of 96,207 units supports production requirements.

NTTFS4C05NTAG (onsemi)

The NTTFS4C05NTAG provides an alternative substitute with Active product status and ROHS3 compliance. This part maintains 30V Vdss and -55°C to 150°C operating temperature compatibility. The reduced gate charge (31nC vs 75nC) and input capacitance (1988pF vs 2820pF) lower switching losses in high-frequency applications. The continuous drain current at Ta is reduced to 12A; however, the Tc rating of 75A supports thermal-limited operation. The 8-WDFN (3.3x3.3) package is mechanically compatible with the original footprint. Inventory of 95,100 units ensures availability.

NTTFS4C05NTWG (onsemi)

The NTTFS4C05NTWG is electrically identical to the NTTFS4C05NTAG with equivalent performance characteristics and ROHS3 compliance. This variant is classified as Last Time Buy, indicating limited future availability. Selection of this part is appropriate only when existing inventory commitments or design lock-in requirements necessitate its use. Inventory of 5,016 units is available but subject to depletion.

Regulatory and Compliance Considerations:

All substitute parts maintain REACH Unaffected status and comply with ROHS3 requirements, ensuring compatibility with current environmental and regulatory standards. The AON7440's Obsolete status necessitates transition to Active or Last Time Buy alternatives to maintain supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the FDMC8010 directly replace the AON7440 in existing PCB layouts?

A: The FDMC8010 uses a Power33 package rather than the original 8-DFN-EP (3.3x3.3) package. While both are surface mount configurations, the footprint differs. PCB layout modification is required. Thermal performance is equivalent or superior due to improved on-resistance characteristics.

Q: What is the primary advantage of the NTTFS4C05NTAG over the FDMC8010?

A: The NTTFS4C05NTAG features significantly lower gate charge (31nC vs 94nC) and input capacitance (1988pF vs 5860pF), reducing switching losses in applications operating above 100kHz. The 8-WDFN (3.3x3.3) package maintains footprint compatibility with the original AON7440. The trade-off is reduced continuous drain current at Ta (12A vs 30A).

Q: Is the NTTFS4C05NTWG suitable for new designs?

A: The NTTFS4C05NTWG is classified as Last Time Buy, indicating onsemi will discontinue production. This part is suitable only for designs requiring existing inventory or when contractual obligations mandate its use. New designs should prioritize the FDMC8010 or NTTFS4C05NTAG for long-term supply assurance.

Q: What are the thermal implications of selecting the NTTFS4C05NTAG for continuous current applications?

A: The NTTFS4C05NTAG is rated for 12A continuous drain current at Ta (ambient temperature) compared to the AON7440's 28A. In applications where continuous current at Ta exceeds 12A, thermal management becomes case-temperature (Tc) dependent. At Tc, the part supports 75A, equivalent to the AON7440's 50A Tc rating. Thermal analysis is required to confirm suitability for specific application conditions.

Q: Are all substitute parts compatible with ±20V gate voltage?

A: Yes. All substitute parts (FDMC8010, NTTFS4C05NTAG, NTTFS4C05NTWG) maintain the ±20V Vgs (Max) specification, ensuring gate drive circuit compatibility with the original AON7440 design.

Q: What is the impact of higher gate charge in the FDMC8010?

A: The FDMC8010 exhibits higher gate charge (94nC vs 75nC) and input capacitance (5860pF vs 2820pF) compared to the AON7440. In applications with fixed gate drive current, switching time increases proportionally. Gate drive circuits must supply adequate current to maintain switching frequency targets. The superior on-resistance (1.3mOhm vs 2.8mOhm) typically offsets increased switching losses in most power conversion topologies.

Q: Can package differences affect circuit performance?

A: Package differences between 8-DFN-EP, Power33, and 8-WDFN affect PCB layout, thermal coupling, and parasitic inductance. The 8-WDFN (3.3x3.3) package used by NTTFS4C05NTAG and NTTFS4C05NTWG maintains mechanical compatibility with the original footprint. The Power33 package used by FDMC8010 requires layout redesign but provides equivalent or superior thermal performance. Trace routing, via placement, and thermal pad design must be evaluated for each package variant.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain REACH Unaffected status and comply with ROHS3 requirements. These certifications ensure compliance with current environmental regulations and support supply chain continuity across global markets.

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