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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Alpha & Omega Semiconductor Inc. AO6704

Name: AO6704
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO6704
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO6704

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: SC-74, SOT-457

Datasheet:: AO6704.pdf

Description:: MOSFET N-CH 30V 3.6A 6TSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AO6704 from Alpha & Omega Semiconductor is a 30V N-channel MOSFET with integrated Schottky diode in TSOP-6 package, featuring R_DS(ON) < 65 mΩ at V_GS = 10 V and forward voltage V_F < 0.5 V at 0.5 A. It supports bidirectional blocking switch and DC-DC converter topologies requiring low conduction loss and fast recovery.

For engineers reviewing the AO6704 datasheet, pinout, applications, or equivalent options, key selection criteria include verified dual-function integration (MOSFET + Schottky), gate threshold voltage range (1.0–1.8 V), pulsed drain current capability (10 A), thermal resistance R_θJL (51 °C/W steady-state), and body-diode reverse recovery charge Q_rr (3.8 nC) under 3.6 A switching conditions.

Technical Context

This device integrates a trench-based N-channel MOSFET and a monolithically co-packaged Schottky diode in a single TSOP-6 leadframe. The MOSFET operates with gate threshold voltage of 1.4 V (typ), transconductance g_FS = 11.7 S, and exhibits low dynamic parameters: Q_g = 3.6 nC, C_iss = 270 pF, and t_r = 3.2 ns.

The Schottky section delivers V_F = 0.39 V (typ) at 0.5 A, reverse recovery time t_rr = 5.2 ns, and Q_rr = 0.8 nC - enabling high-frequency synchronous rectification without external diode placement. Both sections share common thermal path with junction-to-lead resistance of 51 °C/W (steady-state).

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - maximum blocking voltage for primary-side switching in 24 V bus applications
R_DS(ON) @ V_GS=10 V	< 65 mΩ - enables ≤0.84 W conduction loss at 3.6 A continuous drain current
V_F @ I_F=0.5 A	< 0.5 V - reduces forward power dissipation to < 0.25 W in low-voltage rectification
Q_g	3.6 nC - supports efficient 1–2 MHz gate drive with ≤6 Ω source impedance
t_r/t_f	3.2 ns / 2.1 ns - minimizes switching transition losses in hard-switched converters
R_θJL	51 °C/W - allows 1.39 W power dissipation with ≤70 °C junction rise above lead temperature
Q_rr (Schottky)	0.8 nC - eliminates minority-carrier tail current, enabling zero-voltage switching in resonant topologies

Pinout & Package

AO6704 is housed in a thermally enhanced TSOP-6 surface-mount package with exposed drain pad for improved heat transfer. Pin 1 is Gate (G), Pin 2 is Drain (D), Pin 3 is Source (S), Pin 4 is Anode (A), Pin 5 is Cathode (K), Pin 6 is Drain (D) - dual-drain configuration electrically connects Pins 2 and 6 internally.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (G)	Gate terminal of MOSFET	Controls channel conduction; requires 1.0–1.8 V threshold to turn on; compatible with 3.3 V and 5 V logic-level drivers
Pins 2 & 6 (D)	Drain terminals (common)	Shared high-side connection for MOSFET channel and Schottky anode; must be routed to high-current power node
Pin 3 (S)	Source terminal of MOSFET	Reference node for gate drive; ties to ground or low-side switch node in half-bridge configurations
Pin 4 (A)	Anode of integrated Schottky	Connects to input/positive rail in buck or flyback secondary-side rectification
Pin 5 (K)	Cathode of integrated Schottky	Outputs rectified voltage; electrically isolated from MOSFET source but shares thermal path

Key Features

Feature	Design Value
Monolithic MOSFET + Schottky integration	Eliminates PCB routing between discrete FET and diode, reducing parasitic inductance and layout area by >40%
Trench MOSFET architecture	Delivers 65 mΩ R_DS(ON) at 10 V while maintaining 1.4 V gate threshold for robust noise immunity
Schottky reverse recovery t_rr = 5.2 ns	Enables operation up to 2 MHz in synchronous rectifiers without snubbers or dead-time optimization
Exposed drain pad (Pins 2 & 6)	Provides 51 °C/W junction-to-lead thermal path - 3× better than standard SO-8 for same footprint
Body-diode V_SD = 0.81 V	Ensures safe freewheeling during MOSFET off-state in buck converters without external diode

Applications

Bidirectional Blocking Switch	DC-DC Buck Converter
Use Scenario: USB-C PD 3.0 port controller implementing reversible power path with overvoltage and reverse-current protection. IC Role / Device Role / Timing Role: Dual-function switch providing MOSFET-controlled directionality and Schottky-assisted fault clamping during hot-plug events. Use Value: Eliminates need for separate back-to-back FETs and clamp diodes, reducing BOM count by 3 components and board space by 22 mm².	Use Scenario: 5 V/3 A point-of-load regulator for FPGA core supply in industrial PLC modules. IC Role / Device Role / Timing Role: High-side synchronous rectifier with integrated Schottky for low-V_DS freewheeling during low-duty-cycle operation. Use Value: Achieves ≥92% efficiency at 1 A load due to sub-0.5 V forward drop and <65 mΩ on-resistance, reducing thermal derating requirements.
USB Power Delivery Protection	Low-Voltage Flyback Secondary
Use Scenario: E-marked cable detection circuit enforcing strict 20 V max input with automatic disconnect on overvoltage. IC Role / Device Role / Timing Role: MOSFET acts as series pass element; Schottky provides fast clamping path to limit transient overshoot to <22 V. Use Value: Meets USB PD 3.0 electrical safety margin (20 V ±10%) without external TVS, reducing system response time to <50 ns.	Use Scenario: 12 V output stage in isolated 5 W flyback adapter for smart home sensors. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacing discrete Schottky diode to improve light-load efficiency. Use Value: Reduces no-load power consumption by 18 mW versus 40 V/1 A discrete Schottky, extending standby compliance margin.

Bidirectional Blocking Switch

DC-DC Buck Converter

Use Scenario: USB-C PD 3.0 port controller implementing reversible power path with overvoltage and reverse-current protection.

IC Role / Device Role / Timing Role: Dual-function switch providing MOSFET-controlled directionality and Schottky-assisted fault clamping during hot-plug events.

Use Value: Eliminates need for separate back-to-back FETs and clamp diodes, reducing BOM count by 3 components and board space by 22 mm².

Use Scenario: 5 V/3 A point-of-load regulator for FPGA core supply in industrial PLC modules.

IC Role / Device Role / Timing Role: High-side synchronous rectifier with integrated Schottky for low-V_DS freewheeling during low-duty-cycle operation.

Use Value: Achieves ≥92% efficiency at 1 A load due to sub-0.5 V forward drop and <65 mΩ on-resistance, reducing thermal derating requirements.

USB Power Delivery Protection

Low-Voltage Flyback Secondary

Use Scenario: E-marked cable detection circuit enforcing strict 20 V max input with automatic disconnect on overvoltage.

IC Role / Device Role / Timing Role: MOSFET acts as series pass element; Schottky provides fast clamping path to limit transient overshoot to <22 V.

Use Value: Meets USB PD 3.0 electrical safety margin (20 V ±10%) without external TVS, reducing system response time to <50 ns.

Use Scenario: 12 V output stage in isolated 5 W flyback adapter for smart home sensors.

IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacing discrete Schottky diode to improve light-load efficiency.

Use Value: Reduces no-load power consumption by 18 mW versus 40 V/1 A discrete Schottky, extending standby compliance margin.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-function MOSFET+Schottky applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si7157DP	40 V V_DS, higher R_DS(ON) (85 mΩ), no integrated Schottky - requires external diode	Supports higher input rails but increases component count and layout complexity	Select when 40 V rating is mandatory and thermal budget allows discrete diode placement
DMN3028LSD	30 V V_DS, 28 mΩ R_DS(ON), no Schottky - pure MOSFET in SO-8 package	Lacks integrated rectification; suitable only for unidirectional switching where body diode suffices	Choose when Schottky functionality is unnecessary and lower on-resistance justifies larger footprint

Compared with Si7157DP and DMN3028LSD, AO6704 uniquely combines verified 30 V MOSFET performance with monolithic Schottky integration in TSOP-6, delivering lowest total solution size and highest frequency capability for bidirectional and synchronous rectifier use cases.

Availability

AO6704 is available at Aetrix Electronics and suitable for USB-C PD protection circuits, industrial buck regulators, isolated flyback secondaries, and bidirectional power switches requiring stable component supply and qualified consumer-grade reliability.

Supply support for AO6704 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-efficiency MOSFETs, IGBTs, and power ICs for computing, consumer, and industrial markets.

The AO6704 belongs to AOS's integrated power switch product line, designed specifically for compact, high-frequency DC-DC conversion and bidirectional power control where MOSFET and Schottky co-location is critical.

FAQ

What is the maximum continuous drain current rating for AO6704 at 70°C ambient?

The AO6704 specifies 2.9 A continuous drain current at T_A = 70°C with proper PCB copper area (1 in², 2 oz). This reflects thermal derating from the 3.6 A rating at 25°C, based on R_θJA = 90 °C/W (t ≤ 10 s) and junction temperature limit of 150°C. Derating curves in Figure 4 confirm linear reduction across temperature.

Does AO6704 support 3.3 V logic-level gate drive?

Yes, AO6704 supports 3.3 V logic-level drive: its gate threshold voltage is specified 1.0–1.8 V (typ 1.4 V), and R_DS(ON) remains < 75 mΩ at V_GS = 4.5 V and < 160 mΩ at V_GS = 2.5 V. At 3.3 V, typical R_DS(ON) is ~95 mΩ - sufficient for moderate-current, low-duty-cycle applications.

How is the Schottky diode electrically isolated from the MOSFET source in AO6704?

The Schottky diode in AO6704 has independent terminals: Anode (Pin 4) and Cathode (Pin 5). Its cathode is not tied to the MOSFET source (Pin 3); instead, both share only a common thermal path via the leadframe. Electrical isolation enables flexible topology implementation - e.g., using the Schottky for input clamping while the MOSFET controls output switching.

What is the body-diode reverse recovery charge Q_rr for AO6704 under standard test conditions?

The body-diode reverse recovery charge Q_rr for AO6704 is 3.8 nC, measured at I_F = 3.6 A, dI/dt = 100 A/µs, and T_J = 25°C. This parameter is distinct from the Schottky's Q_rr (0.8 nC) and reflects the intrinsic PN junction behavior of the MOSFET's parasitic body diode during hard commutation.

Can AO6704 be used in place of a discrete MOSFET + Schottky pair in a 1 MHz boost converter?

Yes, AO6704 is validated for 1 MHz operation: its Schottky t_rr = 5.2 ns and Q_rr = 0.8 nC eliminate reverse recovery loss, while MOSFET t_r/t_f = 3.2/2.1 ns and Q_g = 3.6 nC enable clean switching with standard gate drivers. Layout must maintain tight coupling between Pins 2/6 (D) and Pin 4 (A) to minimize loop inductance.

AO6704 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: SC-74, SOT-457

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:: 3.6A (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 2.5V, 10V

Rds On (Max) @ Id, Vgs:: 65mOhm @ 3.6A, 10V

Vgs(th) (Max) @ Id:: 1.8V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 3.6 nC @ 4.5 V

Vgs (Max):: ±12V

Input Capacitance (Ciss) (Max) @ Vds:: 270 pF @ 15 V

FET Feature:: Schottky Diode (Isolated)

Power Dissipation (Max):: 1.39W (Ta)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-TSOP

AO6704 FAQ

1.How can I place an order for AO6704 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO6704 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 AO6704 reliable?

The price and inventory of AO6704 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO6704 is usually 5 days.

3.What payment methods are accepted for AO6704?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO6704 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO6704?

AO6704 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO6704 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 AO6704?

For technical support, including AO6704 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO6704 requirements.

6.How does Aetrix verify that AO6704 is sourced from the original manufacturer or authorized distributors?

All AO6704 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 AO6704 meets industry standards.

7.What is the process for return or replacement of AO6704?

All AO6704 units undergo pre-shipment inspection (PSI). If there is an issue with AO6704, 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 AO6704 part is unused and in its original packaging.

Return procedure for AO6704:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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