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Alpha & Omega Semiconductor Inc. AOD478
- Part No.:
- AOD478
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- FETs, MOSFETs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AOD478.pdf
- Description:
- MOSFET N-CH 100V 2.5A/11A TO252
- Quantity:
- Payment:
- Shipping:
Inventory:2,263
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Product details
Overview
AOD478 from Alpha & Omega Semiconductor is a 100V N-Channel Trench MOSFET in TO-252 (DPAK) package, rated for 11A continuous drain current at VGS = 10V, with RDS(ON) < 140 mΩ and 100% UIS-tested ruggedness. It serves as a high-efficiency synchronous rectifier or primary-side switch in boost converters for telecom and industrial power supplies.
For engineers reviewing the AOD478 datasheet, pinout, applications, or equivalent options, key selection criteria include its 100V breakdown voltage, low gate charge (Qg = 10.3 nC @ 10V), body-diode recovery performance (trr = 21 ns), thermal resistance (RθJC = 3.3°C/W), and TO-252 package compatibility with surface-mount power designs.
Technical Context
The AOD478 employs advanced trench-gate MOSFET technology optimized for low conduction loss and fast switching. Its RDS(ON) remains stable across VGS = 4.5V–10V (152 mΩ max @ 4.5V), supporting both 5V and 12V gate drive systems.
It features fully characterized dynamic parameters including Qgd = 2.4 nC, Ciss = 445 pF, and tD(off) = 17 ns, enabling precise timing control in high-frequency DC-DC topologies. The device is 100% tested for unclamped inductive switching (UIS) and gate resistance (Rg).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 100 V - Withstands up to 100V drain-source blocking voltage in boost or flyback primary-side switching. |
| ID (VGS=10V) | 11 A - Continuous current capability at full gate drive, suitable for 20–30W power stages. |
| RDS(ON) (VGS=10V) | < 140 mΩ - Low conduction loss reduces I²R heating in high-current synchronous rectification. |
| Qg (10V) | 10.3 nC - Enables efficient 500 kHz–1 MHz switching with moderate gate driver strength (e.g., TC4427). |
| trr | 21 ns - Fast body-diode recovery minimizes shoot-through risk and improves efficiency in synchronous buck/boost. |
| RθJC | 3.3 °C/W - Supports >15 W dissipation with minimal heatsinking when mounted to copper pour. |
| EAS | 225 mJ - Rated avalanche energy ensures robustness during transient overloads without derating. |
Pinout & Package
Package: TO-252 (DPAK), surface-mount, single-die N-Channel MOSFET with exposed drain pad for thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G (Gate) | Control input terminal | Receives gate drive signal; requires ≤3 Ω series resistance to damp ringing due to low Rg = 2 Ω. |
| D (Drain) | High-side power output node | Connected to switched node (e.g., boost inductor); electrically tied to exposed pad for thermal path. |
| S (Source) | Reference return path | Common source node for gate drive reference and current sensing; connects to ground or low-side switch source. |
Key Features
| Feature | Design Value |
|---|---|
| 100% UIS tested | Guarantees survival under unclamped inductive switching events up to 225 mJ without parameter shift. |
| Low RDS(ON) at 4.5V | RDS(ON) < 152 mΩ enables direct logic-level drive from 5V microcontrollers or PWM controllers. |
| Fast body-diode recovery | trr = 21 ns and Qrr = 97 nC reduce reverse-recovery losses in synchronous rectifier configurations. |
| Thermally enhanced DPAK | Exposed drain pad and RθJC = 3.3°C/W allow >15 W operation with 2 oz. copper PCB heatsinking. |
| 100% Rg tested | Ensures consistent gate drive timing and predictable switching behavior across production lots. |
Applications
| Telecom Power Supplies | Industrial LED Backlighting |
|---|---|
Use Scenario: High-efficiency 48V-to-12V isolated DC-DC converter in base station power modules. IC Role / Device Role / Timing Role: Primary-side synchronous rectifier replacing Schottky diode to reduce conduction loss and improve thermal margin. Use Value: Achieves >95% efficiency at full load by cutting forward voltage drop from 0.7V to ~0.05V at 10A. |
Use Scenario: Boost converter driving constant-current LED strings in factory automation lighting. IC Role / Device Role / Timing Role: Main switching FET operating at 300 kHz with tight duty-cycle control for brightness regulation. Use Value: Low Qg and fast tf = 4.5 ns minimize switching loss, enabling compact magnetics and reduced EMI filtering. |
| Consumer AC-DC Adapters | Industrial Boost PFC Stages |
Use Scenario: Secondary-side synchronous rectifier in 65W laptop adapter with QR flyback topology. IC Role / Device Role / Timing Role: Low-side switch controlled by dedicated SR controller (e.g., MP6908) with adaptive timing. Use Value: RDS(ON) < 140 mΩ at 10V eliminates need for forced-air cooling in sealed enclosures. |
Use Scenario: Boost switch in active PFC stage for 1 kW industrial motor drive front-end. IC Role / Device Role / Timing Role: High-current, high-voltage switching element handling 10A peak inductor current at 100 kHz. Use Value: 100% UIS rating ensures reliability during line surges and inrush transients without snubber redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-Channel MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP11NK100Z | 1000V rating, higher RDS(ON) (1.2 Ω), TO-220 package, slower switching (Qg = 42 nC) | Better suited for offline SMPS primary switches where voltage margin >600V is required | Select only if system requires >600V VDS headroom; not suitable for high-frequency sync rectification due to excessive Qg. |
| IRF540N | 100V rating, RDS(ON) = 44 mΩ (at VGS=10V), TO-220, no UIS testing, higher Ciss (1,350 pF) | Legacy general-purpose switch; lacks body-diode optimization for synchronous rectification | Acceptable for low-frequency (<100 kHz), non-critical linear or switching use; avoid in high-efficiency sync rectifier or PFC roles. |
Compared with STP11NK100Z and IRF540N, the AOD478 delivers superior high-frequency efficiency via lower Qg, faster trr, and guaranteed UIS robustness-making it optimal for compact, thermally constrained 100V synchronous rectifiers and boost switches.
Availability
AOD478 is available at Aetrix Electronics and suitable for telecom power supplies, industrial LED backlighting, consumer AC-DC adapters, and boost PFC stages requiring stable component supply and long-term manufacturability.
Supply support for AOD478 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-performance MOSFETs, IGBTs, and power ICs for computing, consumer, industrial, and automotive markets.
The AOD478 belongs to AOS's advanced trench MOSFET product line, engineered specifically for high-efficiency, high-density DC-DC conversion and synchronous rectification in space-constrained power supplies.
FAQ
What is the maximum continuous drain current for the AOD478 at 100°C case temperature?
The AOD478 supports 5 A continuous drain current at TC = 100°C, as specified in its Absolute Maximum Ratings table. This derating reflects thermal limits of the TO-252 package and ensures safe operation without exceeding TJ(max) = 175°C. Designers must verify PCB copper area and airflow to sustain this current in real-world conditions. The AOD478 maintains RDS(ON) stability up to 125°C junction temperature, preserving efficiency across industrial temperature ranges.
Does the AOD478 support 5V gate drive in logic-level applications?
Yes, the AOD478 is fully compatible with 5V gate drive: its gate threshold voltage (VGS(th)) ranges from 1.7 V to 2.8 V, and RDS(ON) is guaranteed < 152 mΩ at VGS = 4.5 V. This allows direct interface with 5V microcontrollers, PWM controllers, or gate drivers without level-shifting. The AOD478's low Qg (5.1 nC @ 4.5V) further ensures fast turn-on with minimal drive power, making it ideal for battery-powered or low-voltage control systems.
Is the AOD478 pin-compatible with other TO-252 N-Channel MOSFETs?
The AOD478 uses standard TO-252 (DPAK) pinout: Gate (left), Drain (center, tab), Source (right) in top view. While mechanical footprint matches industry-standard DPAK devices, electrical characteristics-including RDS(ON), Qg, and trr-are unique to the AOD478. Substitution requires validation of switching loss, thermal rise, and body-diode behavior. The AOD478 is not a drop-in replacement for generic DPAK MOSFETs unless those parameters are matched within design margins.
What does "100% UIS tested" mean for the AOD478?
"100% UIS tested" means every AOD478 unit undergoes unclamped inductive switching stress test per JEDEC JESD22-A109, verifying minimum single-pulse avalanche energy (EAS) of 225 mJ at TJ = 25°C. This ensures robustness against inductive kickback during hard-switching faults or startup transients. Unlike statistical sampling, 100% testing guarantees each AOD478 can survive worst-case energy events without degradation-critical for industrial and telecom power systems where field reliability is non-negotiable.
Can the AOD478 be used in synchronous rectifier configurations with standard SR controllers?
Yes, the AOD478 is widely deployed with synchronous rectifier controllers such as MP6908, NCP4306, and UCC24612. Its fast body-diode recovery (trr = 21 ns), low Qrr (97 nC), and tight VGS(th) distribution enable accurate zero-voltage switching detection and minimal dead-time penalty. The AOD478's low RDS(ON) and thermal performance also reduce conduction loss in secondary-side rectification, directly improving overall converter efficiency in flyback and LLC topologies.
AOD478 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 100 V
- Current - Continuous Drain (Id) @ 25°C:
- 2.5A (Ta), 11A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 4.5V, 10V
- Rds On (Max) @ Id, Vgs:
- 140mOhm @ 4.5A, 10V
- Vgs(th) (Max) @ Id:
- 2.8V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 13 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 540 pF @ 50 V
- FET Feature:
- -
- Power Dissipation (Max):
- 2.1W (Ta), 45W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252 (DPAK)
AOD478 FAQ
1.How can I place an order for AOD478 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOD478 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AOD478 reliable?
The price and inventory of AOD478 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOD478 is usually 5 days.
3.What payment methods are accepted for AOD478?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOD478 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOD478?
AOD478 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOD478 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AOD478?
For technical support, including AOD478 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOD478 requirements.
6.How does Aetrix verify that AOD478 is sourced from the original manufacturer or authorized distributors?
All AOD478 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AOD478 meets industry standards.
7.What is the process for return or replacement of AOD478?
All AOD478 units undergo pre-shipment inspection (PSI). If there is an issue with AOD478, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AOD478 part is unused and in its original packaging.
Return procedure for AOD478:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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