AOD472 N-Channel MOSFET 25V 55A TO-252 Equivalent & Substitute Parts

Part Overview

The AOD472 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 25V drain-to-source voltage with 55A continuous drain current in a surface mount TO-252 (DPAK) package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. The AOD472 operates across a wide temperature range from -55°C to 175°C junction temperature and is suitable for power switching applications requiring moderate voltage and high current handling in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	25	V
Continuous Drain Current (Id) @ 25°C	55	A (Tc)
On-Resistance (Rds On) @ 30A, 10V	6	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.5	V
Gate Charge (Qg) @ 10V	50	nC
Input Capacitance (Ciss) @ 12.5V	2460	pF
Power Dissipation (Max)	60	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-252 (DPAK)	Surface Mount
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)

Substitute Part Grouping Explanation

Substitution of the AOD472 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss) must equal or exceed 25V
Continuous Drain Current (Id) must meet or exceed 55A at 25°C
Gate Threshold Voltage (Vgs(th)) must be compatible with 2.5V nominal specification
On-Resistance (Rds On) characteristics must support equivalent switching performance
Gate Charge (Qg) and Input Capacitance (Ciss) must be within acceptable ranges for circuit timing
Operating temperature range must span -55°C to 175°C

Mechanical Compatibility Criteria:

Package type must be TO-252 (DPAK) surface mount configuration
Pin configuration must match 2 Leads + Tab standard
Mounting type must be surface mount

Substitute parts are grouped into two categories: Direct Equivalents (matching or exceeding all primary electrical specifications) and Functional Alternatives (meeting core requirements with minor parameter variations that do not compromise circuit operation).

Parameter Comparison

Parameter	AOD472	FDD8796	FDD8896	IRFR3709ZTRLPBF	IRFR3709ZTRPBF	IRFR3711ZTRPBF	STD100N3LF3
Manufacturer	Alpha & Omega	Fairchild	Fairchild	Infineon	Infineon	Infineon	STMicroelectronics
Vdss (V)	25	25	30	30	30	20	30
Id @ 25°C (A)	55 (Tc)	35 (Tc)	94 (Tc)	86 (Tc)	86 (Tc)	93 (Tc)	80 (Tc)
Rds On (mOhm)	6 @ 30A, 10V	5.7 @ 35A, 10V	5.7 @ 35A, 10V	6.5 @ 15A, 10V	6.5 @ 15A, 10V	5.7 @ 15A, 10V	5.5 @ 40A, 10V
Vgs(th) (V)	2.5 @ 250µA	2.5 @ 250µA	2.5 @ 250µA	2.25 @ 250µA	2.25 @ 250µA	2.45 @ 250µA	2.5 @ 250µA
Qg (nC)	50 @ 10V	52 @ 10V	60 @ 10V	26 @ 4.5V	26 @ 4.5V	27 @ 4.5V	27 @ 5V
Ciss (pF)	2460 @ 12.5V	2610 @ 13V	2525 @ 15V	2330 @ 15V	2330 @ 15V	2160 @ 10V	2060 @ 25V
Power Dissipation (W)	60 (Tc)	88 (Tc)	80 (Tc)	79 (Tc)	79 (Tc)	79 (Tc)	110 (Tc)
Operating Temp (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175
Package	TO-252 (DPAK)	TO-252 (DPAK)	TO-252 (DPAK)	TO-252AA (DPAK)	TO-252AA (DPAK)	TO-252AA (DPAK)	DPAK
Product Status	Obsolete	Active	Active	Not For New Designs	Not For New Designs	Not For New Designs	Obsolete
RoHS Status	Not specified	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: FDD8796 (Fairchild Semiconductor)

The FDD8796 is the preferred substitute for the AOD472. It maintains the 25V Vdss rating and TO-252 (DPAK) package configuration. While the continuous drain current is rated at 35A (Tc) compared to the AOD472's 55A, the FDD8796 delivers superior on-resistance performance (5.7 mOhm versus 6 mOhm) and higher power dissipation capability (88W versus 60W). The FDD8796 is currently in active production status, ensuring long-term availability. It carries the same gate threshold voltage (2.5V) and operating temperature range (-55°C to 175°C), providing direct functional compatibility.

Secondary Recommendation: STD100N3LF3 (STMicroelectronics)

The STD100N3LF3 offers higher voltage rating (30V Vdss) and superior current handling (80A Tc) with excellent on-resistance (5.5 mOhm @ 40A, 10V). Power dissipation reaches 110W (Tc), providing thermal margin. The device is packaged in TO-252 (DPAK) surface mount configuration. Although classified as obsolete, it remains available in inventory (15,465 pieces). The higher voltage rating provides design margin for applications where the 25V specification may be marginal.

Alternative Consideration: FDD8896 (Fairchild Semiconductor)

The FDD8896 provides the highest current capability (94A Tc) and power dissipation (80W Tc) among active-status alternatives. It features 30V Vdss rating and TO-252 (DPAK) packaging. The higher voltage rating accommodates applications with voltage transients. This device is actively produced with substantial inventory availability (43,200 pieces).

Not Recommended for New Designs:

IRFR3709ZTRLPBF, IRFR3709ZTRPBF, and IRFR3711ZTRPBF are classified as "Not For New Designs" by Infineon Technologies. While these devices meet electrical specifications, their obsolescence trajectory makes them unsuitable for long-term production commitments.

Compliance Considerations:

All recommended substitutes maintain REACH Unaffected status and EAR99 export classification consistent with the AOD472. RoHS3 compliance is confirmed for active-status alternatives (FDD8796, FDD8896, Infineon HEXFET series, STD100N3LF3).

Frequently Asked Questions (FAQ)

Q: Can the FDD8796 replace the AOD472 in all applications?

A: The FDD8796 is electrically compatible with the AOD472 for applications operating at or below 55A continuous drain current. The FDD8796 is rated for 35A continuous drain current (Tc), which is lower than the AOD472's 55A rating. Applications requiring the full 55A capability must use alternatives such as FDD8896, IRFR3709 series, or STD100N3LF3. All devices share identical 25V Vdss rating, TO-252 packaging, and operating temperature range.

Q: What is the difference between TO-252 and TO-252AA packaging?

A: Both TO-252 and TO-252AA are DPAK (2 Leads + Tab) surface mount packages with identical pin configurations and footprints. The designations refer to minor manufacturing variations that do not affect mechanical or electrical compatibility. Devices in either package type are interchangeable on standard TO-252 PCB layouts.

Q: Why do some substitutes have higher Vdss ratings (30V) than the AOD472 (25V)?

A: Higher Vdss ratings provide design margin and protection against voltage transients without compromising performance at the 25V operating point. Devices rated for 30V operate identically at 25V but offer additional safety margin. This is particularly beneficial in applications with inductive switching or supply voltage variations.

Q: Are the Infineon HEXFET devices suitable for new production?

A: IRFR3709ZTRLPBF, IRFR3709ZTRPBF, and IRFR3711ZTRPBF are classified as "Not For New Designs" by Infineon Technologies. While currently available in inventory, these devices are on an obsolescence trajectory. New designs should prioritize active-status alternatives such as FDD8796 or FDD8896 to ensure long-term supply chain stability.

Q: How do gate charge differences affect circuit design?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. The AOD472 requires 50 nC @ 10V, while Infineon HEXFET devices require only 26-27 nC @ 4.5-5V. Lower gate charge reduces driver power dissipation and enables faster switching. Fairchild PowerTrench devices (FDD8796, FDD8896) require 52-60 nC, comparable to the AOD472. Gate driver circuits must supply sufficient charge for reliable switching; lower gate charge does not compromise compatibility.

Q: What is the significance of on-resistance (Rds On) matching?

A: On-resistance directly determines conduction losses and heat dissipation. The AOD472 specifies 6 mOhm @ 30A, 10V. Substitutes with lower Rds On (5.5-5.7 mOhm) reduce power dissipation and improve efficiency. Higher Rds On values increase heat generation. For applications operating at or below 30A, the slight Rds On variations among substitutes are negligible. High-current applications (>40A) benefit from lower Rds On values offered by STD100N3LF3 (5.5 mOhm) and Fairchild devices (5.7 mOhm).

Q: Can I use a substitute with lower continuous current rating?

A: Substitutes must be selected based on actual circuit current requirements, not the AOD472's maximum rating. If your application operates at 35A or below, the FDD8796 (35A rating) is suitable. If your application requires 55A continuous current, alternatives such as FDD8896 (94A), IRFR3709 series (86A), or STD100N3LF3 (80A) are necessary. Exceeding a device's continuous current rating causes thermal runaway and failure.

Q: What is the impact of input capacitance (Ciss) on switching performance?

A: Input capacitance affects gate drive requirements and switching speed. The AOD472 specifies 2460 pF @ 12.5V. Substitutes range from 2060 pF (STD100N3LF3) to 2610 pF (FDD8796). These variations are minor and do not require gate driver circuit modifications. Lower Ciss values (STD100N3LF3, IRFR3709 series) enable slightly faster switching; higher values (FDD8796) require marginally more gate charge but remain compatible with standard drivers.

Q: Are all substitutes available in the same packaging?

A: All recommended substitutes are packaged in TO-252 (DPAK) surface mount configuration with 2 Leads + Tab. PCB footprints are identical. Minor designations (TO-252 versus TO-252AA) do not affect mechanical compatibility. All devices are directly interchangeable on existing PCB layouts without modification.

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