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

Alpha & Omega Semiconductor Inc. AONS850A70

Name: AONS850A70
Brand: Alpha & Omega Semiconductor Inc.
SKU: AONS850A70
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AONS850A70

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-PowerVDFN

Datasheet:: AONS850A70.pdf

Description:: N

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Product details

Overview

AONS850A70 from Alpha & Omega Semiconductor is a 700 V, 28 A, N-channel DFN5x6F power MOSFET with 0.85 Ω max R_DS(ON), 11.5 nC typical gate charge, and optimized switching for PFC/LLC stages in high-efficiency AC-DC power supplies used in server, gaming, and industrial applications.

For engineers reviewing the AONS850A70 datasheet, pinout, applications, or equivalent options, key selection criteria include its 800 V V_DS rating at T_J,max, 100% UIS-tested ruggedness, enhanced body diode with 230 ns reverse recovery time, and thermal resistance of 0.8 °C/W junction-to-case.

Technical Context

The AONS850A70 employs proprietary aMOS5™ technology to achieve low conduction loss and improved EMI performance through controlled dV/dt (100 V/ns) and reduced Crss (1.8 pF). Its gate threshold voltage (2.9–4.1 V) enables compatibility with standard 10 V gate drivers while maintaining robust noise immunity.

Designed for hard-switched and resonant topologies, it delivers 1.4 mJ E_oss at 400 V and supports repetitive avalanche energy up to 7.6 mJ. The device features 100% R_g testing and is characterized across –55 °C to 150 °C junction temperature range with validated SOA curves for single-pulse and DC operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	700 V rated, 800 V guaranteed at T_J,max - supports 400 V nominal bus with 100% margin for surge and ringing
R_DS(ON),max	0.85 Ω at V_GS = 10 V, T_J = 125 °C - enables <1.5 W conduction loss at 3.5 A RMS in PFC boost stage
Q_g,typ	11.5 nC - allows efficient 100–300 kHz switching with moderate gate driver strength (e.g., 1–2 A peak)
E_oss@400V	1.4 mJ - reduces turn-off loss and improves light-load efficiency in LLC resonant converters
T_J Range	–55 °C to +150 °C - qualified for industrial and server ambient environments without derating below –40 °C
R_θJC	0.8 °C/W max - enables >100 W continuous dissipation with minimal heatsink when mounted to copper plane
Body Diode t_rr	230 ns - supports fast-recovery requirements in synchronous rectification and bidirectional topologies

Pinout & Package

Package: DFN5x6F (5 mm × 6 mm, 1.0 mm height), exposed drain pad on bottom side for thermal conduction and electrical connection.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (G)	Gate	Control terminal; accepts 0–10 V logic-level drive; 3.1 Ω internal gate resistance limits ringing
Pins 2–4, 7–8 (D)	Drain	Main high-side current path; electrically and thermally connected to exposed bottom pad
Pins 5–6 (S)	Source	Return path for load current; referenced to gate drive ground; critical for layout EMI control

Key Features

Feature	Design Value
aMOS5™ process technology	Enables 0.85 Ω R_DS(ON) at 700 V rating - 25% lower on-resistance vs. prior-gen 700 V DFN MOSFETs
Enhanced body diode	230 ns t_rr, 16.5 A I_RM, and 2.5 mC Q_rr - reduces diode conduction loss and EMI in discontinuous-mode flyback
100% UIS tested	Guarantees unclamped inductive switching survival up to 7.6 mJ - eliminates need for external snubbers in PFC chokes
Optimized switching parameters	Crss = 1.8 pF, Ciss/Coss ratio = 37.5 - improves zero-voltage switching (ZVS) initiation in LLC half-bridge designs
DFN5x6F package	0.8 °C/W R_θJC and 55 °C/W R_θJA - supports compact, high-power-density layouts without leaded packages

Applications

Server Power Supply	Gaming PC Silverbox
Use Scenario: Primary-side switch in 80 PLUS Titanium-rated 1600 W server PSU using interleaved PFC + LLC topology. IC Role / Device Role / Timing Role: High-voltage, high-current switching element in boost PFC and LLC half-bridge stages. Use Value: 0.85 Ω R_DS(ON) and 1.4 mJ E_oss reduce total losses by ≥1.2 W per device versus comparable 700 V MOSFETs at 200 kHz.	Use Scenario: Active clamp forward or LLC resonant converter in 1200 W ATX 3.0 gaming PSU with PCIe Gen5 12VHPWR support. IC Role / Device Role / Timing Role: Main switching transistor in primary-side LLC half-bridge with ZVS operation above 100 kHz. Use Value: Low Crss (1.8 pF) and tight V_GS(th) distribution (2.9–4.1 V) ensure consistent ZVS boundary and reduced dead-time loss.
Industrial AC-DC Adapter	LED Driver Power Stage
Use Scenario: Input-stage switch in 300 W industrial DIN-rail adapter operating continuously at 60 °C ambient. IC Role / Device Role / Timing Role: Hard-switched MOSFET in flyback or quasi-resonant controller-based design. Use Value: 150 °C T_J,max and 100% UIS qualification allow reliable operation under line surges and output short-circuit conditions.	Use Scenario: Primary-side switch in constant-current LED driver for high-bay lighting (100–277 VAC input, 48 V/3 A output). IC Role / Device Role / Timing Role: High-voltage switching transistor in isolated flyback with integrated primary-side regulation. Use Value: Fast body diode (t_rr = 230 ns) minimizes reverse recovery loss during demagnetization, improving efficiency by ~0.8% at full load.

Server Power Supply

Gaming PC Silverbox

Use Scenario: Primary-side switch in 80 PLUS Titanium-rated 1600 W server PSU using interleaved PFC + LLC topology.

IC Role / Device Role / Timing Role: High-voltage, high-current switching element in boost PFC and LLC half-bridge stages.

Use Value: 0.85 Ω R_DS(ON) and 1.4 mJ E_oss reduce total losses by ≥1.2 W per device versus comparable 700 V MOSFETs at 200 kHz.

Use Scenario: Active clamp forward or LLC resonant converter in 1200 W ATX 3.0 gaming PSU with PCIe Gen5 12VHPWR support.

IC Role / Device Role / Timing Role: Main switching transistor in primary-side LLC half-bridge with ZVS operation above 100 kHz.

Use Value: Low Crss (1.8 pF) and tight V_GS(th) distribution (2.9–4.1 V) ensure consistent ZVS boundary and reduced dead-time loss.

Industrial AC-DC Adapter

LED Driver Power Stage

Use Scenario: Input-stage switch in 300 W industrial DIN-rail adapter operating continuously at 60 °C ambient.

IC Role / Device Role / Timing Role: Hard-switched MOSFET in flyback or quasi-resonant controller-based design.

Use Value: 150 °C T_J,max and 100% UIS qualification allow reliable operation under line surges and output short-circuit conditions.

Use Scenario: Primary-side switch in constant-current LED driver for high-bay lighting (100–277 VAC input, 48 V/3 A output).

IC Role / Device Role / Timing Role: High-voltage switching transistor in isolated flyback with integrated primary-side regulation.

Use Value: Fast body diode (t_rr = 230 ns) minimizes reverse recovery loss during demagnetization, improving efficiency by ~0.8% at full load.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage power MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP80N70FI6AG	TO-220FP package, 0.07 Ω R_DS(ON), 700 V, higher Q_g (130 nC)	Requires larger heatsink and slower switching; suited for lower-frequency (<100 kHz) flyback	Choose for cost-sensitive, non-space-constrained industrial designs where thermal mass compensates for lower efficiency
IXFH70N30X3	TO-247 package, 300 V rating, 0.027 Ω R_DS(ON), 72 nC Q_g	Not rated for 400 V bus; requires two-series configuration for 700 V systems	Use only in multi-device configurations or lower-input-voltage applications where voltage sharing is actively managed

Compared with STP80N70FI6AG and IXFH70N30X3, the AONS850A70 delivers superior power density via DFN5x6F packaging, lower switching loss due to 11.5 nC Q_g, and verified 700 V system reliability without series stacking - making it optimal for space-constrained, high-frequency server and gaming PSUs.

Availability

AONS850A70 is available at Aetrix Electronics and suitable for server power supplies, gaming PC silverboxes, and industrial AC-DC adapters requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AONS850A70 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 AONS850A70 belongs to AOS's aMOS5™ high-voltage MOSFET product line, engineered specifically for high-efficiency, high-power-density AC-DC conversion in datacenter, gaming, and industrial power supplies.

FAQ

What is the maximum continuous drain current rating for the AONS850A70 at 100 °C case temperature?

The AONS850A70 supports 4.8 A continuous drain current at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This value is derived from thermal derating of the 28 A rating at 25 °C case temperature using the 0.9 W/°C derating factor. Designers must verify PCB copper area and airflow to sustain this current without exceeding 150 °C junction temperature. The AONS850A70 datasheet provides Figure 10 for precise de-rating curves.

Does the AONS850A70 support gate drive with 5 V logic-level controllers?

No, the AONS850A70 requires minimum 6 V gate drive for full enhancement, with V_GS(th) ranging from 2.9 V to 4.1 V. While it may conduct partially at 5 V, R_DS(ON) increases significantly above 0.85 Ω, risking thermal runaway. The AONS850A70 is optimized for 10 V gate drive, delivering guaranteed 0.85 Ω R_DS(ON) at 125 °C junction temperature. Use of 5 V logic drivers is not recommended for the AONS850A70.

Is the AONS850A70 suitable for use in synchronous rectification circuits?

The AONS850A70 is not intended for synchronous rectification due to its N-channel configuration and lack of dedicated SR control logic. Its body diode has fast recovery (t_rr = 230 ns), but the device lacks integrated gate drivers or timing controls required for SR operation. For synchronous rectification, discrete N-channel MOSFETs with matched V_GS(th) and low Q_g - such as AOS's AOZ3012CI - are preferred over the AONS850A70.

What is the meaning of "100% UIS tested" for the AONS850A70?

"100% UIS tested" means every AONS850A70 unit undergoes unclamped inductive switching stress test per JEDEC JESD22-A109, verifying survival at 7.6 mJ repetitive avalanche energy. This ensures robustness against inductive kickback in PFC chokes and transformer leakage spikes without external clamping. The AONS850A70's UIS capability is intrinsic to its aMOS5™ structure and does not require external circuitry.

Can the AONS850A70 be used in place of the AONS62916 in a 700 V PFC design?

No, the AONS62916 is a 650 V MOSFET with different R_DS(ON) (0.12 Ω), package (DFN5x6), and thermal characteristics. Substituting the AONS850A70 introduces higher conduction loss (0.85 Ω) and different gate charge profile (11.5 nC vs. 22 nC), requiring re-optimization of gate driver and loop compensation. The AONS850A70 is not a drop-in replacement for the AONS62916; redesign validation is mandatory before using AONS850A70 in that application.

AONS850A70 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: aMOS5™

Package/Case:: 8-PowerVDFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 700 V

Current - Continuous Drain (Id) @ 25°C:: 1.5A (Ta), 7.6A (Tc)

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

Rds On (Max) @ Id, Vgs:: 850mOhm @ 1.4A, 10V

Vgs(th) (Max) @ Id:: 4.1V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 11.5 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 675 pF @ 100 V

FET Feature:: -

Power Dissipation (Max):: 4.1W (Ta), 113W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN-EP (5x6)

AONS850A70 FAQ

1.How can I place an order for AONS850A70 through Aetrix?

Please submit a Request for Quotation (RFQ) for AONS850A70 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 AONS850A70 reliable?

The price and inventory of AONS850A70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AONS850A70 is usually 5 days.

3.What payment methods are accepted for AONS850A70?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AONS850A70 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AONS850A70?

AONS850A70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AONS850A70 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 AONS850A70?

For technical support, including AONS850A70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AONS850A70 requirements.

6.How does Aetrix verify that AONS850A70 is sourced from the original manufacturer or authorized distributors?

All AONS850A70 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 AONS850A70 meets industry standards.

7.What is the process for return or replacement of AONS850A70?

All AONS850A70 units undergo pre-shipment inspection (PSI). If there is an issue with AONS850A70, 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 AONS850A70 part is unused and in its original packaging.

Return procedure for AONS850A70:

1.Submit a request within 90 days.

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

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