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Alpha & Omega Semiconductor Inc. AO4304
- Part No.:
- AO4304
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- FETs, MOSFETs
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AO4304.pdf
- Description:
- MOSFET N CH 30V 18A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,637
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Product details
Overview
AO4304 from Alpha & Omega Semiconductor is a 30V N-channel enhancement-mode trench MOSFET in SOIC-8 package, rated for 18A continuous drain current at VGS = 10V, with RDS(ON) < 6.0 mΩ (VGS = 10V) and < 7.6 mΩ (VGS = 4.5V), optimized for high-efficiency load switching and battery protection circuits.
For engineers reviewing the AO4304 datasheet, pinout, applications, or equivalent options, key selection criteria include its low gate charge (Qg = 19–29 nC at 10V), 100% UIS-tested ruggedness, body-diode reverse recovery performance (trr = 7–12 ns), and thermal resistance (RθJA = 65°C/W on FR-4).
Technical Context
The AO4304 employs advanced trench-gate process technology to achieve ultra-low RDS(ON) while maintaining fast switching characteristics-confirmed by tD(on) = 7.3 ns, tf = 5.3 ns, and Qgd = 3–8 nC. Its gate threshold voltage (1.4–2.4 V) enables reliable 4.5V logic-level drive compatibility.
Thermally, it supports 150°C maximum junction temperature with 100% Rg testing and avalanche-rated operation (EAS = 35 mJ, IAR = 200 A), making it suitable for transient-heavy DC power paths where robustness and thermal predictability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 30 V - Maximum drain-source blocking voltage for 12V/24V system-level load switching |
| ID (VGS = 10V) | 18 A - Continuous conduction capability at full gate drive, sufficient for >20W load switches |
| RDS(ON) (VGS = 10V) | < 6.0 mΩ - Minimizes I²R conduction loss in high-current battery discharge paths |
| RDS(ON) (VGS = 4.5V) | < 7.6 mΩ - Ensures usable on-resistance under standard 5V microcontroller GPIO drive |
| Qg (10V) | 19–29 nC - Determines gate driver power requirement and switching speed in PWM-controlled loads |
| trr | 7–12 ns - Enables clean commutation in synchronous rectification and bidirectional battery protection |
| RθJA | 65 °C/W - Thermal performance measured on 1-in² 2oz FR-4 board, defines heatsinking needs at 18A |
Pinout & Package
AO4304 is housed in a standard SOIC-8 surface-mount package with exposed drain pads on pins 1–4 and 6–8, source terminals on pins 5 and 7, and gate on pin 2. The dual-drain configuration supports parallel internal die connection for low-inductance, high-current routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4, 6, 7, 8 | Drain (D) | High-current output node; internally paralleled for reduced RDS(ON) and thermal spreading |
| 5, 7 | Source (S) | Power return path; pin 5 and pin 7 both connected to source metallization |
| 2 | Gate (G) | Control input; requires ≤2.3 Ω gate resistance to limit ringing during 10V switching |
Key Features
| Feature | Design Value |
|---|---|
| 100% UIS tested | Guarantees unclamped inductive switching survival up to 35 mJ, critical for hot-swap and motor-drive fault tolerance |
| Low Qgd/Qg ratio | Qgd = 3–8 nC / Qg = 19–29 nC → ~25% - Reduces Miller-induced shoot-through risk in half-bridge configurations |
| Body diode trr & Qrr | trr = 7–12 ns, Qrr = 14–21 nC - Enables efficient synchronous rectification without external Schottky |
| 100% Rg tested | Gate resistance 0.7–2.3 Ω verified per unit - Ensures consistent turn-on timing and EMI behavior across production lots |
| Trench MOSFET architecture | Delivers 30% lower RDS(ON) vs. planar equivalents at same die size - improves power density in space-constrained battery packs |
Applications
| Smartphone Battery Protection | USB-C Power Delivery Switch |
|---|---|
Use Scenario: Bidirectional overcurrent and short-circuit protection between battery cell and USB-C PD port in portable devices. IC Role / Device Role: Primary N-channel load switch controlling main power path with integrated reverse-current blocking. Use Value: Low 7.6 mΩ RDS(ON) at 4.5V gate drive minimizes voltage drop during 3A–5A PD negotiation and charging. |
Use Scenario: High-side power switch enabling/disabling 20V/5A power delivery to downstream peripherals. IC Role / Device Role: Single-pole, normally-open power FET with fast turn-off (<25 ns tD(off)) to meet USB-C fault response timing. Use Value: 100% UIS rating ensures survival during cable hot-plug transients without external TVS clamping. |
| Industrial PLC Digital Output Module | Wireless Earbud Charging Case |
Use Scenario: 24V DC solid-state relay replacement driving solenoids and indicator LEDs in DIN-rail controllers. IC Role / Device Role: Low-side switching element with integrated avalanche energy handling for inductive kickback suppression. Use Value: 200A peak avalanche current rating allows direct drive of 100mA–2A inductive loads without snubber networks. |
Use Scenario: Load switch isolating lithium-polymer battery from charging circuitry during wireless charging cycles. IC Role / Device Role: Reverse-polarity and over-discharge protection FET placed between battery anode and charging IC input. Use Value: SOIC-8 footprint enables compact layout; low 6.0 mΩ RDS(ON) preserves >98% charging efficiency at 1.5A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si2304DS | RDS(ON) = 55 mΩ @ 4.5V; SOT-23 package; 3.6A ID | Lower current capacity, higher on-resistance - suited only for sub-1A signal switching | Select when board space is constrained and power dissipation < 0.2W is required |
| IRF7470PBF | RDS(ON) = 5.8 mΩ @ 10V; SO-8; 17A ID; no UIS rating specified | Lacks 100% UIS qualification - not recommended for unclamped inductive loads | Acceptable for resistive or lightly inductive loads where avalanche stress is absent |
Compared with Si2304DS and IRF7470PBF, the AO4304 delivers superior combination of low 4.5V RDS(ON), full UIS ruggedness, and SOIC-8 thermal performance-making it uniquely suitable for battery protection and industrial load switching where reliability under transient stress is non-negotiable.
Availability
AO4304 is available at Aetrix Electronics and suitable for smartphone battery protection, USB-C power delivery switching, and industrial PLC digital output modules requiring stable component supply and long-term manufacturability.
Supply support for AO4304 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, and industrial markets.
The AO4304 belongs to AOS's TrenchMOS® family, engineered specifically for high-current, low-voltage load switching applications where conduction loss, switching speed, and transient robustness must be simultaneously optimized.
FAQ
What is the maximum continuous drain current rating for the AO4304 at 70°C ambient temperature?
The AO4304 supports 14 A continuous drain current at TA = 70°C with proper PCB copper area, as specified in its Absolute Maximum Ratings table. This derating reflects thermal limits imposed by RθJA = 65°C/W and TJ(MAX) = 150°C. At 25°C ambient, the AO4304 sustains 18 A continuously. Designers must verify board layout thermal performance before operating near these limits.
Does the AO4304 support 3.3V logic-level gate drive?
The AO4304 has a gate threshold voltage range of 1.4–2.4 V, but its RDS(ON) is not characterized below VGS = 4.5V. At 3.3V, the device will turn on partially, resulting in unpredictable and elevated conduction loss. For guaranteed performance, AO4304 requires ≥4.5V gate drive; use a level-shifter or gate driver if interfacing with 3.3V microcontrollers.
Is the AO4304 pin-compatible with other SOIC-8 N-channel MOSFETs like the AO3400?
No-the AO4304 uses a proprietary multi-drain SOIC-8 pinout (pins 1,3,4,6,7,8 = Drain; pins 5,7 = Source; pin 2 = Gate), whereas AO3400 follows standard SOIC-8 single-drain layout. PCB layout and thermal pad connections differ significantly. Direct replacement requires redesign; always verify pin mapping using the AO4304 top-view diagram before substitution.
What does "100% UIS tested" mean for the AO4304?
"100% UIS tested" means every AO4304 unit undergoes unclamped inductive switching stress test per JEDEC JESD22-A110, verifying minimum 35 mJ single-pulse avalanche energy capability. This ensures field reliability in applications with inductive loads (e.g., relays, motors) where voltage spikes exceed VDS rating-no additional external clamping is needed for basic protection.
Can the AO4304 be used in synchronous rectification topologies?
Yes-the AO4304's fast body diode (trr = 7–12 ns, Qrr = 14–21 nC) and low Qgd/Qg ratio make it suitable for secondary-side synchronous rectification in DC-DC converters up to ~500 kHz. Its 4.5V RDS(ON) < 7.6 mΩ ensures low forward conduction loss, and SOIC-8 thermal profile supports sustained 10–15A pulsed currents typical in such designs.
AO4304 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 30 V
- Current - Continuous Drain (Id) @ 25°C:
- 18A (Ta)
- Drive Voltage (Max Rds On, Min Rds On):
- 4.5V, 10V
- Rds On (Max) @ Id, Vgs:
- 6mOhm @ 15A, 10V
- Vgs(th) (Max) @ Id:
- 2.4V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 29 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 1920 pF @ 15 V
- FET Feature:
- -
- Power Dissipation (Max):
- 3.6W (Ta)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AO4304 FAQ
1.How can I place an order for AO4304 through Aetrix?
Please submit a Request for Quotation (RFQ) for AO4304 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 AO4304 reliable?
The price and inventory of AO4304 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4304 is usually 5 days.
3.What payment methods are accepted for AO4304?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4304 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AO4304?
AO4304 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AO4304 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 AO4304?
For technical support, including AO4304 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4304 requirements.
6.How does Aetrix verify that AO4304 is sourced from the original manufacturer or authorized distributors?
All AO4304 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 AO4304 meets industry standards.
7.What is the process for return or replacement of AO4304?
All AO4304 units undergo pre-shipment inspection (PSI). If there is an issue with AO4304, 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 AO4304 part is unused and in its original packaging.
Return procedure for AO4304:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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