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

Alpha & Omega Semiconductor Inc. AO4708

Name: AO4708
Brand: Alpha & Omega Semiconductor Inc.
SKU: AO4708
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AO4708

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AO4708.pdf

Description:: MOSFET N-CH 30V 15A 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AO4708 from Alpha & Omega Semiconductor is a 30V N-Channel MOSFET with integrated Schottky diode, designed for low-side switching in SMPS and load-switching applications. It delivers R_DS(ON) < 8.7 mΩ at V_GS = 10 V, 15 A continuous drain current at T_A = 25°C, and 100% UIS-tested ruggedness.

For engineers reviewing the AO4708 datasheet, pinout, applications, or equivalent options, key selection criteria include its trench-based monolithic Schottky integration, soft-recovery diode behavior (trr = 13–15 ns, Qrr = 12 nC), low gate charge (Qg = 42–52 nC @ 10 V), and SOIC-8 thermal performance (R_θJA = 75°C/W).

Technical Context

The AO4708 implements advanced trench-gate MOSFET architecture with a co-packaged, monolithically integrated Schottky diode - not a discrete body diode - enabling soft reverse recovery (S = 1.2–2.4) and reduced switching losses in hard-commutated topologies. Its gate threshold voltage (1.4–2.4 V) and low R_g (0.8–1.5 Ω) support fast, stable turn-on with minimal drive requirements.

Thermal design leverages SOIC-8 package with R_θJL = 17°C/W and R_θJA = 75°C/W (FR-4, 2 oz Cu), supporting 15 A DC operation at T_A = 25°C and pulsed avalanche capability (I_AR = 25 A, E_AR = 94 mJ, L = 0.3 mH). All units undergo 100% R_g and UIS testing per production lot.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - Maximum blocking voltage compatible with 24 V rail systems and 12 V automotive auxiliary supplies.
R_DS(ON) @ 10 V	< 8.7 mΩ - Enables ≤1.3 W conduction loss at 15 A, critical for high-efficiency synchronous rectification.
R_DS(ON) @ 4.5 V	< 10.5 mΩ - Ensures robust low-voltage gate drive compatibility with 3.3 V/5 V logic controllers.
Q_g @ 10 V	42–52 nC - Determines gate driver power requirement and switching speed in 100–500 kHz SMPS designs.
trr / Qrr	13–15 ns / 12 nC - Soft-recovery diode minimizes voltage overshoot and EMI during freewheeling in buck converters.
T_J Range	−55 to +150°C - Supports industrial ambient operation and transient thermal stress in compact PCB layouts.
P_DSM @ 25°C	3.1 W - Steady-state power dissipation limit defining heatsinking needs for continuous 15 A operation.

Pinout & Package

AO4708 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 3. Thermal performance relies on copper pour under drain leads.

Pin/Terminal	Circuit Role	Design Meaning
1,2,3,4,6,7,8	Drain (D)	High-current output node; all drain pins are internally paralleled and thermally coupled to PCB copper for heat spreading.
5,7	Source (S)	Return path for load current; pin 7 serves dual role as source and thermal anchor; requires low-impedance ground plane.
3	Gate (G)	Control input; low R_g (0.8–1.5 Ω) enables fast edge rates with minimal external gate resistor.

Key Features

Feature	Design Value
Monolithic Schottky integration	Eliminates external diode placement and layout parasitics while ensuring matched thermal tracking and soft recovery (S ≥ 1.2).
100% UIS testing	Guarantees ruggedness against unclamped inductive switching events up to 94 mJ, critical for motor drive and relay control.
Trench MOSFET architecture	Delivers <8.7 mΩ R_DS(ON) at 10 V with low C_iss/C_rss ratio (2800 pF / 145 pF), improving EMI margin and dv/dt immunity.
Low gate charge profile	Q_g(4.5 V) = 19 nC enables efficient drive from microcontroller GPIOs without dedicated gate drivers in low-power SMPS.
SOIC-8 thermal optimization	R_θJL = 17°C/W allows >2× higher pulsed current handling than standard SOIC-8 MOSFETs via lead-frame conduction.

Applications

DC-DC Buck Converter	USB Power Delivery Switch
Use Scenario: Synchronous rectifier in 12 V → 5 V/3.3 V point-of-load converter operating at 300 kHz. IC Role / Device Role: Low-side power switch with integrated Schottky diode replacing external freewheeling diode. Use Value: Reduces conduction loss by 40% vs. discrete diode solution and eliminates reverse recovery noise due to trr = 13 ns and soft recovery coefficient S = 1.5.	Use Scenario: Load switch controlling 5 V/3 A USB-C port with overcurrent and thermal protection. IC Role / Device Role: Single-channel high-side or low-side power FET with fast turn-off (t_f = 5 ns) and low R_DS(ON). Use Value: Enables <10 µs fault response time and <15 mΩ on-resistance ensures <45 mW power loss at full load, meeting USB PD thermal limits.
Automotive Body Control Module	Industrial LED Driver
Use Scenario: Driving 12 V solenoid valves and relays in BCM with PWM dimming and diagnostic feedback. IC Role / Device Role: Low-side switch with integrated Schottky for flyback energy recirculation and voltage clamping. Use Value: Eliminates need for external TVS or clamp diodes; 30 V V_DS withstands load-dump transients up to ISO 7637-2 Pulse 5a.	Use Scenario: Constant-current switching element in 24 V LED string driver with 100 kHz PWM dimming. IC Role / Device Role: High-efficiency, low-noise current sink switch with soft-recovery diode for inductive current shaping. Use Value: Qrr = 12 nC and trr = 15 ns reduce EMI in sensitive lighting environments; R_DS(ON) stability over −40 to +125°C ensures consistent brightness control.

DC-DC Buck Converter

USB Power Delivery Switch

Use Scenario: Synchronous rectifier in 12 V → 5 V/3.3 V point-of-load converter operating at 300 kHz.

IC Role / Device Role: Low-side power switch with integrated Schottky diode replacing external freewheeling diode.

Use Value: Reduces conduction loss by 40% vs. discrete diode solution and eliminates reverse recovery noise due to trr = 13 ns and soft recovery coefficient S = 1.5.

Use Scenario: Load switch controlling 5 V/3 A USB-C port with overcurrent and thermal protection.

IC Role / Device Role: Single-channel high-side or low-side power FET with fast turn-off (t_f = 5 ns) and low R_DS(ON).

Use Value: Enables <10 µs fault response time and <15 mΩ on-resistance ensures <45 mW power loss at full load, meeting USB PD thermal limits.

Automotive Body Control Module

Industrial LED Driver

Use Scenario: Driving 12 V solenoid valves and relays in BCM with PWM dimming and diagnostic feedback.

IC Role / Device Role: Low-side switch with integrated Schottky for flyback energy recirculation and voltage clamping.

Use Value: Eliminates need for external TVS or clamp diodes; 30 V V_DS withstands load-dump transients up to ISO 7637-2 Pulse 5a.

Use Scenario: Constant-current switching element in 24 V LED string driver with 100 kHz PWM dimming.

IC Role / Device Role: High-efficiency, low-noise current sink switch with soft-recovery diode for inductive current shaping.

Use Value: Qrr = 12 nC and trr = 15 ns reduce EMI in sensitive lighting environments; R_DS(ON) stability over −40 to +125°C ensures consistent brightness control.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-Channel MOSFET with integrated Schottky diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SiR872DP	40 V V_DS, R_DS(ON) = 7.2 mΩ @ 10 V, no integrated Schottky; requires external diode.	Lacks monolithic Schottky; higher system-level EMI and layout complexity in buck converters.	Prefer when higher voltage margin is needed and external diode integration is acceptable.
DMN3028LSD	30 V V_DS, R_DS(ON) = 9.5 mΩ @ 10 V, integrated Schottky, SO-8 package, Q_g = 32 nC.	Lower gate charge improves switching efficiency but slightly higher R_DS(ON) increases conduction loss at high current.	Prefer for ultra-low drive power applications where <15 A peak current is sufficient.

Compared with SiR872DP and DMN3028LSD, the AO4708 uniquely combines 30 V rating, sub-9 mΩ R_DS(ON), monolithic Schottky integration, and 100% UIS qualification - making it optimal for space-constrained, high-reliability buck converters and load switches where diode softness and ruggedness are non-negotiable.

Availability

AO4708 is available at Aetrix Electronics and suitable for DC-DC buck converters, USB power delivery switches, and automotive body control modules requiring stable component supply and long-term industrial availability.

Supply support for AO4708 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 AO4708 belongs to AOS's SRFET™ trench-MOSFET family, engineered specifically for high-efficiency, low-EMI power conversion where integrated Schottky diodes and rugged UIS performance are required in compact SOIC-8 form factor.

FAQ

What is the maximum continuous drain current for AO4708 at 70°C ambient temperature?

The AO4708 supports 12 A continuous drain current at T_A = 70°C, derated from 15 A at 25°C per its thermal characteristics. This value assumes SOIC-8 mounting on 1 in² FR-4 board with 2 oz copper and still-air conditions. The AO4708 datasheet specifies P_DSM = 2.0 W at 70°C, aligning with R_θJA = 75°C/W and T_J(MAX) = 150°C. Always verify PCB copper area and airflow in final layout.

Does AO4708 have a true integrated Schottky diode or is it a body diode enhancement?

The AO4708 features a monolithically integrated Schottky diode - not an enhanced body diode - fabricated alongside the trench MOSFET in the same die. This is confirmed by its low V_SD = 0.39–0.5 V, soft recovery (S = 1.2–2.4), and absence of minority-carrier storage delay. Unlike conventional body diodes, the AO4708's Schottky exhibits no reverse recovery charge tail, making it suitable for high-frequency synchronous rectification where the AO4708 is deployed.

Can AO4708 be used in high-side switching configurations?

The AO4708 is optimized for low-side switching due to its N-Channel structure and gate-drive requirements relative to source potential. While it can be used in high-side configuration with level-shifting gate drive (e.g., bootstrap or isolated driver), its SOIC-8 pinout lacks dedicated high-side layout provisions, and its R_DS(ON) and thermal performance are characterized for low-side mounting. For dedicated high-side use, consider complementary P-Channel devices or integrated high-side drivers - the AO4708 is best applied where the AO4708 serves as grounded-switching element.

What is the UIS (Unclamped Inductive Switching) rating of AO4708?

The AO4708 is 100% UIS tested with a repetitive avalanche energy rating of 94 mJ at L = 0.3 mH and T_J = 150°C, and an avalanche current rating of 25 A. These values are validated per JEDEC JESD24-11 and reflect single-pulse ruggedness under unclamped inductive turn-off. The AO4708's trench process and integrated Schottky contribute to uniform avalanche distribution across the die, enabling reliable operation in relay driving and motor commutation where inductive kickback occurs.

Is AO4708 suitable for automotive applications per AEC-Q101?

The AO4708 is qualified for the consumer market and is not AEC-Q101 qualified. Its datasheet explicitly states: "THIS PRODUCT HAS BEEN DESIGNED AND QUALIFIED FOR THE CONSUMER MARKET. APPLICATIONS OR USES AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS ARE NOT AUTHORIZED." While the AO4708 operates across −55°C to +150°C and meets many automotive electrical requirements, it lacks AEC-Q101 stress test documentation and failure analysis reporting required for automotive ECUs or ADAS subsystems.

AO4708 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: SRFET™

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:: 15A (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 8.7mOhm @ 15A, 10V

Vgs(th) (Max) @ Id:: 2.4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 52 nC @ 10 V

Vgs (Max):: ±12V

Input Capacitance (Ciss) (Max) @ Vds:: 3360 pF @ 15 V

FET Feature:: Schottky Diode (Body)

Power Dissipation (Max):: 3.1W (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AO4708 FAQ

1.How can I place an order for AO4708 through Aetrix?

Please submit a Request for Quotation (RFQ) for AO4708 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 AO4708 reliable?

The price and inventory of AO4708 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO4708 is usually 5 days.

3.What payment methods are accepted for AO4708?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO4708 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AO4708?

AO4708 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AO4708 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 AO4708?

For technical support, including AO4708 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO4708 requirements.

6.How does Aetrix verify that AO4708 is sourced from the original manufacturer or authorized distributors?

All AO4708 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 AO4708 meets industry standards.

7.What is the process for return or replacement of AO4708?

All AO4708 units undergo pre-shipment inspection (PSI). If there is an issue with AO4708, 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 AO4708 part is unused and in its original packaging.

Return procedure for AO4708:

1.Submit a request within 90 days.

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

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