AON6544 N-Channel MOSFET 30V 60A/85A Equivalent & Substitute Parts

Part Overview

The AON6544 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with continuous drain current of 60A (Ta) and 85A (Tc). The device is housed in an 8-DFN (5x6) surface mount package and is designed for high-current switching applications. The AON6544 is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal characteristics while accommodating available packaging options.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	60	A
Continuous Drain Current @ 25°C (Tc)	85	A
On-Resistance (Rds On) @ 20A, 10V	1.4	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.2	V
Gate Charge (Qg) @ 10V	120	nC
Input Capacitance (Ciss) @ 15V	5910	pF
Power Dissipation (Ta)	7.4	W
Power Dissipation (Tc)	83	W
Operating Temperature Range	-55 to 150	°C
Package Type	8-DFN (5x6)	Surface Mount
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitution of the AON6544 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
Continuous Drain Current: Must support minimum 60A (Ta) or 85A (Tc) rating
On-Resistance (Rds On): Must not exceed 1.4mOhm @ 20A, 10V to maintain thermal performance
Gate Threshold Voltage (Vgs(th)): Must be compatible with 2.2V @ 250µA specification
Operating Temperature Range: Must span -55°C to 150°C
FET Type: N-Channel only
Technology: MOSFET (Metal Oxide) only

Secondary Compatibility Parameters:

Gate Charge (Qg): Lower values indicate faster switching; values up to 120nC @ 10V are acceptable
Input Capacitance (Ciss): Values up to 5910pF @ 15V are acceptable
Package Type: Surface mount packages with compatible footprints and thermal characteristics

The three substitute parts listed (AON6312, CSD17312Q5, DMT32M5LFG-13) meet the primary electrical criteria while offering different packaging and product status options.

Parameter Comparison

Parameter	AON6544 (Main)	AON6312 (Substitute)	CSD17312Q5 (Substitute)	DMT32M5LFG-13 (Substitute)
Manufacturer	Alpha & Omega Semiconductor	Alpha & Omega Semiconductor	Texas Instruments	Diodes Incorporated
Vdss (V)	30	30	30	30
Continuous Drain Current (Ta) (A)	60	—	38	30
Continuous Drain Current (Tc) (A)	85	85	100	—
Rds On @ 20A, 10V (mOhm)	1.4	1.85	1.5	1.7
Vgs(th) @ 250µA (V)	2.2	2.2	1.5	3.0
Gate Charge (Qg) @ 10V (nC)	120	65	36	67.7
Input Capacitance (Ciss) @ 15V (pF)	5910	3100	5240	4066
Power Dissipation (Ta) (W)	7.4	—	3.2	2.3
Power Dissipation (Tc) (W)	83	50	—	—
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package Type	8-DFN (5x6)	8-DFN (5x6)	8-VSON-CLIP (5x6)	PowerDI3333-8
Product Status	Obsolete	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AON6312 (Alpha & Omega Semiconductor Inc.)

The AON6312 is the manufacturer-recommended substitute for the AON6544. Both devices share identical Vdss (30V) and Tc drain current (85A) ratings, operate across the same temperature range (-55°C to 150°C), and use the same 8-DFN (5x6) package footprint. The AON6312 is classified as Active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The Rds On specification (1.85mOhm @ 20A, 10V) is slightly higher than the AON6544 (1.4mOhm), resulting in marginally increased power dissipation (50W Tc versus 83W Tc). Gate charge is reduced to 65nC, enabling faster switching characteristics. This substitute is suitable for direct replacement in existing designs with identical PCB layouts.

CSD17312Q5 (Texas Instruments NexFET™ Series)

The CSD17312Q5 offers the highest continuous drain current rating (100A Tc) among the substitutes, exceeding the AON6544 specification. The device maintains 30V Vdss compatibility and operates across the required temperature range. The package is 8-VSON-CLIP (5x6), which differs from the AON6544's 8-DFN footprint but maintains identical external dimensions (5x6mm). The Rds On (1.5mOhm @ 35A, 8V) is superior to the AON6544, and gate charge is significantly reduced (36nC @ 4.5V), providing improved switching efficiency. The CSD17312Q5 is Active product status with ROHS3 compliance. PCB layout modification is required due to package type change.

DMT32M5LFG-13 (Diodes Incorporated)

The DMT32M5LFG-13 is qualified to AEC-Q101 automotive standards and carries Automotive grade designation. The device maintains 30V Vdss and operates across the required temperature range. Continuous drain current is rated at 30A (Ta), which is lower than the AON6544's 60A (Ta) specification. The package is PowerDI3333-8, differing from the AON6544's 8-DFN format. Rds On (1.7mOhm @ 20A, 10V) and gate charge (67.7nC @ 10V) are within acceptable ranges. This substitute is suitable for applications requiring automotive qualification and lower current requirements. PCB layout modification is required due to package type change.

Frequently Asked Questions (FAQ)

Q: Can the AON6312 be used as a direct replacement for the AON6544?

A: Yes. The AON6312 is the manufacturer-recommended substitute and shares identical package type (8-DFN 5x6), Vdss (30V), and Tc drain current (85A) ratings. No PCB layout modification is required. The slightly higher Rds On (1.85mOhm versus 1.4mOhm) results in acceptable thermal performance differences for most applications.

Q: What are the package differences between the substitute parts?

A: The AON6312 uses 8-DFN (5x6) packaging, identical to the AON6544. The CSD17312Q5 uses 8-VSON-CLIP (5x6) packaging, and the DMT32M5LFG-13 uses PowerDI3333-8 packaging. While the CSD17312Q5 and DMT32M5LFG-13 maintain the same external dimensions (5x6mm), internal lead configurations differ, requiring PCB layout modifications.

Q: Which substitute part offers the best thermal performance?

A: The CSD17312Q5 provides the highest continuous drain current (100A Tc) and lowest Rds On (1.5mOhm @ 35A, 8V), resulting in superior thermal characteristics. However, package type change requires PCB redesign.

Q: Is the DMT32M5LFG-13 suitable for non-automotive applications?

A: Yes. The DMT32M5LFG-13 is qualified to AEC-Q101 automotive standards but is not restricted to automotive use. However, its 30A (Ta) current rating is lower than the AON6544's 60A (Ta), limiting its application scope to lower-current designs.

Q: What is the significance of the gate charge (Qg) differences?

A: Gate charge affects switching speed and driver power requirements. Lower Qg values (CSD17312Q5 at 36nC) enable faster switching and reduce gate driver stress compared to higher values (AON6544 at 120nC). Selection depends on circuit switching frequency and driver capabilities.

Q: Are all substitute parts RoHS compliant?

A: Yes. The AON6312, CSD17312Q5, and DMT32M5LFG-13 are all ROHS3 compliant. The original AON6544 RoHS status is not specified in the provided data.

Q: Can I use the CSD17312Q5 in a design originally specified for the AON6544?

A: Electrical substitution is valid due to matching Vdss (30V), superior drain current (100A Tc), and compatible operating temperature range. However, the package type change (8-VSON-CLIP versus 8-DFN) requires PCB layout modification and thermal management reassessment.

Q: What is the primary reason for substituting the AON6544?

A: The AON6544 is classified as obsolete product status. Substitution ensures design continuity and long-term component availability. The AON6312 is the recommended choice for direct replacement without PCB modification.

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