AON6542 Equivalent & Substitute Parts

Part Overview

The AON6542 is an N-Channel MOSFET rated for 30V drain-to-source voltage with continuous drain current of 23A (Ta) and 30A (Tc). This device is packaged in an 8-DFN (5x6) surface mount configuration and is designed for general-purpose switching and power conversion applications. The AON6542 is classified as obsolete, making identification of functionally equivalent substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C	23A (Ta), 30A (Tc)	A
On-Resistance (Rds On) @ 20A, 10V	5	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.2	V
Gate Charge (Qg) @ 10V	22.5	nC
Input Capacitance (Ciss) @ 15V	951	pF
Power Dissipation	4.1W (Ta), 25W (Tc)	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount
Package	8-DFN (5x6)
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)

Substitute Part Grouping Explanation

Substitute parts for the AON6542 are selected based on electrical and mechanical compatibility within the following criteria:

Mandatory Matching Parameters:

Drain-to-Source Voltage (Vdss): 30V minimum
FET Type: N-Channel
Technology: MOSFET (Metal Oxide)
Operating Temperature Range: -55°C to 150°C
Mounting Type: Surface Mount
Package Form Factor: 5x6mm footprint

Performance Criteria for Substitution:

Continuous Drain Current: Equal to or greater than 23A (Ta) / 30A (Tc)
On-Resistance (Rds On): Equal to or lower than 5mOhm @ specified conditions
Gate Threshold Voltage: Within ±20V gate voltage specification
Gate Charge: Acceptable for gate drive circuit compatibility
Input Capacitance: Acceptable for switching frequency and drive requirements

The three substitute parts listed below meet or exceed these electrical specifications while maintaining the same voltage class and thermal operating range.

Parameter Comparison

Parameter	AON6542	CSD17577Q5A	CSD17577Q5AT	STL90N3LLH6
Manufacturer	Alpha & Omega Semiconductor	Texas Instruments	Texas Instruments	STMicroelectronics
Vdss (V)	30	30	30	30
Continuous Drain Current @ 25°C (A)	23 (Ta), 30 (Tc)	60 (Ta)	60 (Ta)	90 (Tc)
Rds On (mOhm) @ specified conditions	5 @ 20A, 10V	4.2 @ 18A, 10V	4.2 @ 18A, 10V	4.5 @ 12A, 10V
Vgs(th) (V) @ 250µA	2.2	1.8	1.8	1.0
Gate Charge (nC) @ 10V	22.5	35	35	17
Input Capacitance (pF) @ specified Vds	951 @ 15V	2310 @ 15V	2310 @ 15V	1690 @ 25V
Power Dissipation (W)	4.1 (Ta), 25 (Tc)	3 (Ta), 53 (Tc)	3 (Ta), 53 (Tc)	60 (Tc)
Operating Temperature (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	8-DFN (5x6)	8-VSONP (5x6)	8-VSONP (5x6)	PowerFlat™ (5x6)
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected	REACH Unaffected

Engineering Selection Recommendations

CSD17577Q5A (Texas Instruments)

This part is recommended as the primary substitute for the AON6542. It exceeds the electrical specifications of the original part with 60A continuous drain current and lower on-resistance (4.2mOhm). The device maintains the same 30V voltage rating and -55°C to 150°C operating temperature range. The 8-VSONP (5x6) package is mechanically compatible with the original 8-DFN footprint. The part is active in production status and ROHS3 compliant, ensuring long-term availability and regulatory compliance. REACH status is unaffected.

CSD17577Q5AT (Texas Instruments)

This variant is electrically identical to CSD17577Q5A but supplied in Cut Tape and Digi-Reel packaging. It is suitable for applications requiring alternative packaging formats. The part is active in production and ROHS3 compliant. Note that REACH status is affected for this variant, which may require additional documentation for certain supply chain requirements.

STL90N3LLH6 (STMicroelectronics)

This part provides the highest current rating at 90A (Tc) and represents a performance upgrade option. It features lower gate charge (17nC) and lower gate threshold voltage (1V), which may reduce gate drive power requirements in certain applications. The PowerFlat™ (5x6) package maintains mechanical compatibility. The part is active in production, ROHS3 compliant, and REACH unaffected. This option is suitable for designs requiring enhanced thermal performance or lower switching losses.

Frequently Asked Questions (FAQ)

Q: Can the CSD17577Q5A directly replace the AON6542 without PCB modifications?

A: The CSD17577Q5A uses an 8-VSONP package with a 5x6mm footprint, which is mechanically compatible with the original 8-DFN (5x6) footprint. Pin assignments and lead spacing are compatible, allowing direct substitution on existing PCBs without layout changes.

Q: What is the difference between CSD17577Q5A and CSD17577Q5AT?

A: Both parts are electrically identical with the same electrical specifications. The difference is in packaging format: CSD17577Q5A is supplied in Tape & Reel (TR), while CSD17577Q5AT is supplied in Cut Tape (CT) and Digi-Reel. Select based on your procurement and assembly requirements.

Q: Why does the STL90N3LLH6 have a lower gate threshold voltage (1V vs. 2.2V)?

A: The STL90N3LLH6 uses STMicroelectronics' DeepGATE and STripFET VI technology, which results in different gate threshold characteristics. This lower threshold voltage may require verification of gate drive circuit compatibility to ensure proper switching behavior at your specified gate voltage levels.

Q: Are there thermal performance differences between the substitute parts?

A: Yes. The CSD17577Q5A and CSD17577Q5AT are rated for 53W (Tc) power dissipation, while the STL90N3LLH6 is rated for 60W (Tc). The STL90N3LLH6 offers superior thermal performance due to its lower on-resistance and higher current rating. Select based on your thermal management requirements and PCB layout capabilities.

Q: Is the AON6542 still available for procurement?

A: The AON6542 is classified as obsolete. The substitute parts listed are all active in production status, ensuring long-term availability and supply chain continuity.

Q: What compliance certifications should I verify for my application?

A: All substitute parts are ROHS3 compliant. CSD17577Q5A and STL90N3LLH6 have REACH unaffected status, while CSD17577Q5AT has REACH affected status. Verify REACH compliance requirements with your supply chain and regulatory requirements before final part selection.

Q: Do the substitute parts have different gate charge characteristics?

A: Yes. The AON6542 has 22.5nC gate charge, while CSD17577Q5A and CSD17577Q5AT have 35nC, and STL90N3LLH6 has 17nC. Higher gate charge requires more gate drive current and energy. Verify your gate driver circuit can supply the required charge for the selected substitute part.

Q: Can I use the STL90N3LLH6 in a design originally specified for the AON6542?

A: The STL90N3LLH6 exceeds all electrical specifications of the AON6542 and is mechanically compatible. However, verify gate drive circuit compatibility due to the lower gate threshold voltage (1V vs. 2.2V) and different gate charge (17nC vs. 22.5nC) to ensure proper switching performance.

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