AON6558 N-Channel MOSFET 30V 25A Equivalent & Substitute Parts

Part Overview

The AON6558 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with 25A continuous drain current at 25°C ambient temperature (28A at case temperature). The device is packaged in an 8-DFN (5x6) surface mount configuration and is part of the AlphaMOS series. The AON6558 carries a product status of "Not For New Designs," indicating that while the part remains in inventory, new circuit designs should evaluate alternative solutions. Equivalent and substitute parts provide active product alternatives with comparable or enhanced electrical performance while maintaining compatibility with existing board layouts and thermal requirements.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	25	A
Continuous Drain Current @ Case Temp (Tc)	28	A
On-Resistance (Rds On) @ 20A, 10V	5.1	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.2	V
Gate Charge (Qg) @ 10V	25	nC
Input Capacitance (Ciss) @ 15V	1128	pF
Power Dissipation (Ta)	5	W
Power Dissipation (Tc)	24	W
Operating Temperature Range	-55 to 150	°C
Package Type	8-DFN (5x6)	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AON6558 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss) must equal or exceed 30V
Continuous drain current must meet or exceed 25A at 25°C ambient temperature
On-resistance (Rds On) characteristics must support equivalent or improved switching performance
Gate threshold voltage must fall within acceptable drive circuit compatibility ranges
Operating temperature range must encompass -55°C to 150°C minimum

Mechanical Compatibility Criteria:

Surface mount packaging with 5x6mm footprint dimensions
Pin configuration compatible with 8-pin power semiconductor packages
MSL rating of 1 (Unlimited) for moisture sensitivity

Compliance Requirements:

ROHS3 compliance mandatory
REACH compliance status must be documented

Substitute parts are grouped into two categories: direct equivalents with identical package types and functional alternatives with different package geometries but equivalent electrical performance and thermal characteristics.

Parameter Comparison

Parameter	AON6558	CSD17577Q5A	CSD17577Q5AT	IRFH5304TRPBF	IRFH8324TRPBF	RQ3E180GNTB	STL66N3LLH5
Manufacturer	Alpha & Omega	Texas Instruments	Texas Instruments	Infineon	Infineon	Rohm	STMicroelectronics
Vdss (V)	30	30	30	30	30	30	30
Id @ 25°C Ta (A)	25	60	60	22	23	18	—
Id @ Tc (A)	28	60	60	79	90	39	80
Rds On @ 10V (mOhm)	5.1	4.2	4.2	4.5	4.1	4.3	5.8
Vgs(th) (V)	2.2	1.8	1.8	2.35	2.35	2.5	3.0
Qg @ 10V (nC)	25	35	35	41	31	22.4	12
Ciss @ Vds (pF)	1128	2310	2310	2360	2380	1520	1500
Power Dissipation Ta (W)	5	3	3	3.6	3.6	2	—
Power Dissipation Tc (W)	24	53	53	46	54	20	72
Operating Temp Range (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	—	-55 to 175
Package Type	8-DFN (5x6)	8-VSONP (5x6)	8-VSONP (5x6)	8-PQFN (5x6)	PQFN (5x6)	8-HSMT (3.2x3)	PowerFlat (5x6)
Product Status	Not For New Designs	Active	Active	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: CSD17577Q5A or CSD17577Q5AT (Texas Instruments NexFET™)

The CSD17577Q5A and CSD17577Q5AT are functionally equivalent N-Channel MOSFETs with 30V Vdss rating and superior current handling capability (60A at 25°C). Both variants maintain the 5x6mm footprint and are ROHS3 compliant with MSL 1 rating. The CSD17577Q5A is supplied in Tape & Reel packaging, while the CSD17577Q5AT is supplied in Cut Tape & Digi-Reel® format. Both devices feature active product status, ensuring long-term availability and manufacturing support. The lower on-resistance (4.2mOhm vs. 5.1mOhm) provides improved thermal performance. The CSD17577Q5AT carries REACH Affected status, while CSD17577Q5A is REACH Unaffected.

Secondary Recommendation: IRFH8324TRPBF (Infineon HEXFET®)

The IRFH8324TRPBF is an active-status N-Channel MOSFET with 30V Vdss and 23A continuous drain current at 25°C ambient temperature. The device features a PQFN (5x6) package compatible with existing board layouts. On-resistance of 4.1mOhm at 20A and 10V provides performance equivalent to or better than the AON6558. Gate charge of 31nC supports efficient switching characteristics. ROHS3 compliance and MSL 1 rating are maintained. High inventory availability (150,424 pieces) ensures supply continuity.

Alternative Recommendation: RQ3E180GNTB (Rohm Semiconductor)

The RQ3E180GNTB is an active-status N-Channel MOSFET with 30V Vdss and 18A continuous drain current at 25°C ambient temperature. The device utilizes a smaller 8-HSMT (3.2x3) package, reducing board footprint. On-resistance of 4.3mOhm and gate charge of 22.4nC provide efficient switching performance. This option is suitable for space-constrained applications where the reduced package size is advantageous. ROHS3 compliance and MSL 1 rating are maintained.

High-Performance Alternative: STL66N3LLH5 (STMicroelectronics STripFET™ V)

The STL66N3LLH5 is an active-status N-Channel MOSFET with 30V Vdss and 80A continuous drain current at case temperature. The device features automotive-grade qualification (AEC-Q101) and extended operating temperature range (-55°C to 175°C). The PowerFlat™ (5x6) package maintains footprint compatibility. This option provides superior thermal performance (72W at Tc) and is suitable for automotive and high-reliability applications. ROHS3 compliance and MSL 1 rating are maintained.

Not Recommended: IRFH5304TRPBF (Infineon HEXFET®)

The IRFH5304TRPBF carries an Obsolete product status, indicating discontinued manufacturing and limited future availability. While electrical parameters are compatible, new designs should not incorporate this part number.

Frequently Asked Questions (FAQ)

Q: Can the CSD17577Q5A be used as a direct replacement for the AON6558 without PCB modifications?

A: The CSD17577Q5A maintains the same 5x6mm footprint and 8-pin power semiconductor package configuration as the AON6558. However, the package type differs (8-VSONP vs. 8-DFN). Verification of pin-to-pin compatibility and solder pad geometry is required before confirming drop-in compatibility. Consult the respective datasheets for detailed package drawings.

Q: What is the significance of the "Not For New Designs" status on the AON6558?

A: This status indicates that Alpha & Omega Semiconductor Inc. has designated the AON6558 as a legacy product. While existing inventory remains available and the part continues to function within specification, the manufacturer recommends that new circuit designs incorporate alternative part numbers. This status typically precedes eventual product discontinuation.

Q: How do the thermal characteristics of substitute parts compare to the AON6558?

A: The CSD17577Q5A and IRFH8324TRPBF provide higher power dissipation ratings at case temperature (53W and 54W respectively vs. 24W for the AON6558), indicating improved thermal performance. The STL66N3LLH5 offers the highest thermal capability (72W at Tc). Lower on-resistance values across substitute parts contribute to reduced power dissipation in switching applications.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed in this reference maintain ROHS3 compliance. The AON6558 is also ROHS3 compliant. Verify REACH compliance status for specific applications, as the CSD17577Q5AT carries REACH Affected designation while other parts are REACH Unaffected.

Q: What is the difference between CSD17577Q5A and CSD17577Q5AT?

A: Both parts are electrically and functionally identical N-Channel MOSFETs with 30V Vdss and 60A continuous drain current. The primary difference is packaging format: CSD17577Q5A is supplied in Tape & Reel (TR) format, while CSD17577Q5AT is supplied in Cut Tape (CT) & Digi-Reel® format. The CSD17577Q5AT carries REACH Affected status, while CSD17577Q5A is REACH Unaffected.

Q: Can the RQ3E180GNTB be used in applications requiring the full 25A current rating of the AON6558?

A: The RQ3E180GNTB is rated for 18A continuous drain current at 25°C ambient temperature, which is below the AON6558 specification of 25A. This part is suitable only for applications with maximum continuous drain current requirements of 18A or less. For applications requiring 25A or higher, select CSD17577Q5A, IRFH8324TRPBF, or STL66N3LLH5.

Q: What packaging considerations apply when substituting the AON6558?

A: The AON6558 uses an 8-DFN (5x6) package. Substitute parts employ various 8-pin power semiconductor packages: 8-VSONP (5x6), 8-PQFN (5x6), 8-HSMT (3.2x3), and PowerFlat™ (5x6). While most maintain the 5x6mm footprint, the RQ3E180GNTB uses a smaller 3.2x3mm package. PCB layout modifications may be required for packages with different solder pad geometries. Consult package datasheets for detailed dimensional specifications.

Q: Is the STL66N3LLH5 suitable for automotive applications?

A: The STL66N3LLH5 carries automotive-grade qualification (AEC-Q101) and is designated for automotive applications. The extended operating temperature range (-55°C to 175°C) supports demanding automotive thermal environments. This part is appropriate for automotive circuit designs requiring high reliability and temperature stability.

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

A: Gate charge affects switching speed and driver circuit requirements. The AON6558 has a gate charge of 25nC at 10V. Substitute parts range from 12nC (STL66N3LLH5) to 41nC (IRFH5304TRPBF). Lower gate charge values enable faster switching transitions and reduce driver power dissipation. Higher values may require gate driver circuits with greater current capability.

Q: Can substitute parts with higher current ratings be used in place of the AON6558?

A: Yes. Substitute parts with equal or higher continuous drain current ratings (CSD17577Q5A at 60A, IRFH8324TRPBF at 23A, STL66N3LLH5 at 80A) are electrically compatible with the AON6558 (25A). The higher current rating provides design margin and improved thermal performance. Verify that gate drive circuits and thermal management remain adequate for the selected substitute part.

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