AOD474A N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The AOD474A is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 75V drain-to-source voltage with continuous drain current of 2.5A (Ta) and 10A (Tc) in a surface mount TO-252 (DPAK) package. The device is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	75	V
Continuous Drain Current @ 25°C (Ta)	2.5	A
Continuous Drain Current @ 25°C (Tc)	10	A
Rds On (Max) @ 5A, 10V	130	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	1.6	V
Gate Charge (Qg) @ 10V	9	nC
Input Capacitance (Ciss) @ 37.5V	280	pF
Power Dissipation (Ta)	2.1	W
Power Dissipation (Tc)	28.5	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-252 (DPAK)	-
FET Type	N-Channel	-
Technology	MOSFET (Metal Oxide)	-

Substitute Part Grouping Explanation

Substitution of the AOD474A is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss) must equal or exceed 75V
Continuous drain current must support application requirements
On-resistance (Rds On) characteristics must be compatible with circuit design
Gate threshold voltage and gate charge must be within acceptable operating ranges
Input capacitance must not degrade circuit performance
Operating temperature range must encompass application requirements

Mechanical Compatibility Criteria:

Package type must be TO-252 (DPAK) or equivalent surface mount configuration
Pin configuration must match TO-252-3 standard (2 Leads + Tab)
Moisture sensitivity level must be MSL 1 or equivalent

Substitute Parts Identified:

ZXMN7A11KTC (Diodes Incorporated) – Direct electrical and mechanical equivalent with active product status
FDD86326 (onsemi) – Higher voltage and current rating with enhanced performance characteristics
FQD13N06LTM (onsemi) – Lower voltage rating with higher current capability
IRFR020TRR (Vishay Siliconix) – Lower voltage rating with higher current capability

Parameter Comparison

Parameter	AOD474A	ZXMN7A11KTC	FDD86326	FQD13N06LTM	IRFR020TRR
Manufacturer	Alpha & Omega Semiconductor	Diodes Incorporated	onsemi	onsemi	Vishay Siliconix
Vdss (V)	75	70	80	60	60
Id @ 25°C Ta (A)	2.5	4.2	8	-	-
Id @ 25°C Tc (A)	10	-	37	11	14
Rds On (Max) @ 10V (mOhm)	130	130	23	115	100
Vgs(th) @ 250µA (V)	1.6	1	4	2.5	4
Gate Charge @ 10V (nC)	9	7.4	19	6.4	25
Ciss (pF)	280	298	1035	350	640
Power Dissipation Ta (W)	2.1	2.11	3.1	2.5	2.5
Power Dissipation Tc (W)	28.5	-	62	28	42
Operating Temperature (°C)	-55 to 175	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	TO-252 (DPAK)	TO-252-3	TO-252AA	TO-252AA	DPAK
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

ZXMN7A11KTC (Primary Substitute)

The ZXMN7A11KTC from Diodes Incorporated is the closest electrical and mechanical equivalent to the AOD474A. This device maintains the same on-resistance characteristic (130 mOhm @ 10V), operates within a 70V voltage rating (5V below the original specification), and is housed in the identical TO-252-3 package. The device is active in production with ROHS3 compliance and MSL 1 rating. The operating temperature range extends to 150°C, which is 25°C lower than the AOD474A but sufficient for most applications. This substitute is suitable for direct replacement in applications where the 75V rating is not critical to circuit operation.

FDD86326 (Enhanced Performance Substitute)

The FDD86326 from onsemi offers superior electrical performance with an 80V rating, significantly reduced on-resistance (23 mOhm @ 10V), and higher current capability (37A Tc). This device is appropriate for applications requiring improved efficiency and thermal performance. The higher gate charge (19 nC) and input capacitance (1035 pF) may impact switching characteristics in high-frequency circuits. The device is active with ROHS3 compliance and MSL 1 rating. Selection of this substitute is justified when thermal management or efficiency improvements are design objectives.

FQD13N06LTM (Lower Voltage Substitute)

The FQD13N06LTM from onsemi operates at 60V, below the AOD474A specification, and is suitable only for applications where the lower voltage rating does not compromise circuit operation. This device offers improved on-resistance (115 mOhm @ 10V) and lower gate charge (6.4 nC @ 5V), beneficial for switching applications. The device is active with ROHS3 compliance and MSL 1 rating. This substitute is appropriate for voltage-derating scenarios or applications with inherent voltage margins.

IRFR020TRR (Lower Voltage Substitute)

The IRFR020TRR from Vishay Siliconix operates at 60V and provides the highest continuous drain current (14A Tc) among substitute options. On-resistance is 100 mOhm @ 10V with higher gate charge (25 nC @ 10V). The device is active but carries RoHS non-compliance status, which may restrict use in regulated applications. This substitute is appropriate for applications where voltage derating is acceptable and RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can the ZXMN7A11KTC directly replace the AOD474A without circuit modification?

A: The ZXMN7A11KTC is mechanically and electrically compatible for direct replacement in most applications. The 70V rating is 5V lower than the AOD474A specification. Verify that circuit operating voltages do not exceed 70V. The identical on-resistance (130 mOhm @ 10V) and similar gate charge (7.4 nC vs. 9 nC) ensure compatible switching behavior. The operating temperature range extends to 150°C, which is acceptable for most industrial applications.

Q: What is the primary difference between the AOD474A and FDD86326?

A: The FDD86326 provides enhanced performance with higher voltage rating (80V vs. 75V), significantly lower on-resistance (23 mOhm vs. 130 mOhm), and substantially higher current capability (37A Tc vs. 10A Tc). These improvements result in reduced power dissipation and improved thermal characteristics. The trade-off includes higher input capacitance (1035 pF vs. 280 pF) and higher gate charge (19 nC vs. 9 nC), which may affect switching speed in high-frequency applications.

Q: Are all substitute parts available in the same TO-252 package?

A: All substitute parts are housed in TO-252 family packages (TO-252-3 or TO-252AA), which are mechanically and electrically compatible. Pin configuration remains consistent across all options: Gate, Drain, and Source connections are identical. PCB layout modifications are not required for package compatibility.

Q: Which substitute is recommended for new designs?

A: The ZXMN7A11KTC is recommended for applications requiring direct electrical equivalence with active product status and modern compliance certifications. The FDD86326 is recommended for designs prioritizing efficiency and thermal performance. Selection between these options depends on specific application voltage and current requirements.

Q: What is the impact of lower operating temperature range on substitute selection?

A: The AOD474A operates to 175°C (TJ), while all substitute parts operate to 150°C (TJ). This 25°C difference is significant only in applications with sustained high-temperature operation. For most industrial and consumer applications operating below 125°C, the reduced temperature range of substitute parts is not a limiting factor. Verify application thermal requirements before selection.

Q: Are there compliance differences between substitute options?

A: The ZXMN7A11KTC, FDD86326, and FQD13N06LTM are ROHS3 compliant. The IRFR020TRR is RoHS non-compliant. All parts are REACH unaffected and carry EAR99 ECCN classification. For applications requiring RoHS compliance, the IRFR020TRR is not suitable.

Q: How does gate charge affect circuit performance?

A: Gate charge determines the energy required to switch the MOSFET on and off. The AOD474A requires 9 nC @ 10V. The ZXMN7A11KTC requires 7.4 nC, resulting in slightly faster switching. The FDD86326 requires 19 nC, resulting in slower switching and higher gate drive power requirements. In low-frequency applications (below 100 kHz), gate charge differences are negligible. In high-frequency switching applications, lower gate charge reduces switching losses and improves efficiency.

Q: What is the significance of on-resistance matching?

A: On-resistance (Rds On) directly determines conduction losses and heat dissipation. The AOD474A and ZXMN7A11KTC both specify 130 mOhm @ 10V, ensuring identical power dissipation characteristics. The FDD86326 specifies 23 mOhm, resulting in significantly lower conduction losses. The FQD13N06LTM and IRFR020TRR specify 115 mOhm and 100 mOhm respectively, offering modest improvements. For thermal-sensitive applications, lower on-resistance reduces junction temperature and extends device life.

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