AOD418 N-Channel MOSFET 30V 13.5A/36A TO-252 Equivalent & Substitute Parts

Part Overview

The AOD418 is an N-Channel MOSFET manufactured by Alpha & Omega Semiconductor Inc., rated for 30V drain-to-source voltage with continuous drain current of 13.5A at Ta (ambient temperature) and 36A at Tc (case temperature). The device is housed in a TO-252 (DPAK) surface mount package and is designed for general-purpose switching and amplification applications in power management circuits.

The AOD418 carries an Obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers while maintaining the same package footprint and pin configuration.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current @ 25°C (Ta)	13.5	A
Continuous Drain Current @ 25°C (Tc)	36	A
On-Resistance (Rds On) @ 20A, 10V	7.5	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.5	V
Gate Charge (Qg) @ 10V	24	nC
Input Capacitance (Ciss) @ 15V	1380	pF
Power Dissipation (Ta)	2.5	W
Power Dissipation (Tc)	50	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-252 (DPAK)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the AOD418 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must equal 30V
Package Type: Must be TO-252 (DPAK) surface mount
FET Type: Must be N-Channel MOSFET
Mounting Type: Must be surface mount

Secondary Compatibility Parameters:

Continuous Drain Current: Substitute must meet or exceed 13.5A @ Ta or 36A @ Tc
On-Resistance (Rds On): Lower or equal values are acceptable
Gate Threshold Voltage (Vgs(th)): Must be within ±20V maximum gate voltage specification
Operating Temperature Range: Must encompass -55°C to 175°C or be compatible with application requirements
RoHS and REACH Compliance: Must maintain ROHS3 Compliant status

Substitutes are grouped into two categories:

Category 1 - Direct Equivalents (Identical Electrical Specifications): Parts with matching Vdss, current ratings, Rds On, and thermal characteristics. These parts are pin-compatible and require no circuit modifications.

Category 2 - Enhanced Performance Substitutes (Superior Electrical Characteristics): Parts with identical Vdss and package, but with higher current ratings, lower Rds On, or improved thermal performance. These parts are backward-compatible and provide design margin improvements.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ Ta (A)	Id @ Tc (A)	Rds On @ 10V (mOhm)	Vgs(th) @ 250µA (V)	Qg @ 10V (nC)	Ciss @ 15V (pF)	Pd (Tc) (W)	Tj Range (°C)	Status
AOD418	Alpha & Omega	30	13.5	36	7.5	2.5	24	1380	50	-55 to 175	Obsolete
AOD418G	Alpha & Omega	30	13.5	36	7.5	2.5	24	1380	50	-55 to 175	Active
DMG8880LK3-13	Diodes Inc.	30	11	—	7.5	2.3	27.6	1289	1.68	-55 to 150	Active
DMN3009SK3-13	Diodes Inc.	30	—	80	5.5	2.5	42	2000	3.4	-55 to 150	Active
FDD8896	Fairchild	30	17	94	5.7	2.5	60	2525	80	-55 to 175	Active
IPD060N03LGATMA1	Infineon	30	—	50	6	2.2	23	2400	56	-55 to 175	Active
IPD075N03LGATMA1	Infineon	30	—	50	7.5	2.2	18	1900	47	-55 to 175	Active
IPD50N03S207ATMA1	Infineon	30	—	50	7.3	4	68	2000	136	-55 to 175	Active
IPD50N03S2L06ATMA1	Infineon	30	—	50	6.4	2	68	1900	136	-55 to 175	Active
IPD50N03S4L06ATMA1	Infineon	30	—	50	5.5	2.2	31	2330	56	-55 to 175	Active
IRFR3709ZTRLPBF	Infineon	30	—	86	6.5	2.25	26	2330	79	-55 to 175	Not For New Designs

Engineering Selection Recommendations

Direct Replacement (Recommended for Obsolescence Mitigation):

AOD418G is the primary recommended substitute. Manufactured by Alpha & Omega Semiconductor Inc., this part maintains identical electrical specifications to the AOD418 while carrying Active product status. The AOD418G provides design continuity with zero circuit modifications required. This part is suitable for immediate drop-in replacement in existing designs and new production runs.

Active Alternatives with Enhanced Performance:

For applications where design margin improvement is acceptable, the following parts provide superior electrical characteristics while maintaining 30V Vdss and TO-252 package compatibility:

IPD050N03S4L06ATMA1 (Infineon): Offers 50A continuous drain current at Tc with 5.5mOhm Rds On, lower on-resistance than the AOD418, and AEC-Q101 automotive qualification. Operating temperature range extends to 175°C. Suitable for high-reliability applications.
FDD8896 (Fairchild): Provides 94A continuous drain current at Tc with 5.7mOhm Rds On and 80W power dissipation at Tc. Maintains -55°C to 175°C operating range. Suitable for applications requiring higher current capacity.
IPD060N03LGATMA1 (Infineon): Delivers 50A continuous drain current at Tc with 6mOhm Rds On and 56W power dissipation. OptiMOS™ series technology provides optimized switching characteristics.

Compliance Verification:

All recommended substitutes maintain ROHS3 Compliant status and REACH Unaffected designation. Parts designated as "Not For New Designs" (IRFR3709ZTRLPBF) are acceptable for legacy system support only and should not be selected for new product development.

Operating Temperature Consideration:

DMG8880LK3-13 and DMN3009SK3-13 (Diodes Inc.) operate to 150°C maximum junction temperature, which is 25°C lower than the AOD418 specification. These parts are suitable only for applications with maximum junction temperature requirements not exceeding 150°C.

Frequently Asked Questions (FAQ)

Q: Can I use AOD418G as a direct replacement for AOD418?

A: Yes. AOD418G is manufactured by the same supplier (Alpha & Omega Semiconductor Inc.) with identical electrical specifications, gate charge, on-resistance, and thermal characteristics. The part is pin-compatible and requires no circuit modifications. AOD418G carries Active product status, ensuring long-term availability.

Q: What is the difference between continuous drain current ratings at Ta and Tc?

A: Ta (ambient temperature) represents continuous current at 25°C ambient with natural convection cooling. Tc (case temperature) represents continuous current with the device case maintained at 25°C through active cooling or thermal management. Tc ratings are typically higher due to improved heat dissipation. Design calculations should use the Ta rating for conservative thermal analysis unless active cooling is implemented.

Q: Are all substitute parts pin-compatible with AOD418?

A: Yes. All listed substitutes use the TO-252 (DPAK) package with identical pin configuration: Gate (pin 1), Drain (pin 2), and Source (tab). Physical footprint and PCB layout compatibility is maintained across all substitutes.

Q: Can I use a substitute with lower on-resistance (Rds On)?

A: Yes. Lower on-resistance values are beneficial and represent improved performance. Substitutes with Rds On values lower than 7.5mOhm will reduce power dissipation and heat generation in the same application, providing design margin improvement. No circuit modifications are required.

Q: What is the significance of Gate Charge (Qg)?

A: Gate charge determines the energy required to switch the MOSFET on and off. Lower gate charge values reduce switching losses and allow faster switching speeds. Substitutes with lower Qg values (such as IPD075N03LGATMA1 at 18nC) improve switching efficiency. Higher Qg values require more gate drive current but do not prevent substitution.

Q: Why do some substitutes have higher continuous drain current ratings?

A: Higher current ratings indicate improved die design, better thermal coupling to the package, or enhanced semiconductor technology. These parts are backward-compatible and can be used in applications designed for lower current ratings. The higher rating provides design margin and allows for potential future application expansion without component change.

Q: Is RoHS3 compliance mandatory for substitution?

A: For new designs and production, ROHS3 Compliant status is required to meet environmental and regulatory standards. All recommended active substitutes maintain ROHS3 Compliant status. Parts not meeting this requirement should be used only in legacy system support where original specifications mandate non-compliant materials.

Q: Can I substitute a part with a lower maximum operating temperature?

A: Substitution with lower maximum junction temperature (Tj) is acceptable only if your application's maximum junction temperature requirement does not exceed the substitute's rating. For example, DMG8880LK3-13 with Tj max of 150°C is suitable for applications with Tj requirements up to 150°C but not for applications requiring 175°C operation. Verify thermal design calculations before selecting temperature-limited substitutes.

Q: What does "Not For New Designs" product status mean?

A: This designation indicates the part is in mature or end-of-life phase and is available for legacy system support only. Parts with this status should not be selected for new product development. IRFR3709ZTRLPBF carries this status and is listed for reference only in applications requiring compatibility with existing designs.

Q: Are automotive-qualified parts (AEC-Q101) required for my application?

A: AEC-Q101 qualification is required only for automotive applications or systems requiring automotive-grade reliability. IPD50N03S2L06ATMA1 and IPD50N03S4L06ATMA1 carry AEC-Q101 qualification and are suitable for automotive and high-reliability industrial applications. Non-automotive applications do not require this qualification.

Q: How do I verify thermal performance with a substitute part?

A: Compare the Power Dissipation (Pd) rating at case temperature (Tc) and the on-resistance (Rds On) value. Lower Rds On values reduce I²R losses. Higher Pd ratings indicate better thermal coupling to the package. Recalculate junction temperature using the substitute's thermal resistance (θJC) and verify the result remains within the application's maximum Tj requirement.

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