The ISOW7821 is a dual-channel, 1/1, reinforced digital isolator with integrated power supply

The ISOW7821 device is a high-performance, dual-channel reinforced digital isolator with an integrated AD5172BRM100 high-efficiency power converter. The integrated DC-DC converter provides up to 650 mW of isolated power with high efficiency and is configurable for various input and output voltage configurations. Therefore, the device eliminates the need for a separate isolated power supply in space-constrained isolated designs.

The ISOW7821 device provides high electromagnetic immunity and low emissions while isolating CMOS or LVCMOS digital I/O. Signal isolation channels have logic input and output buffers separated by a silicon dioxide (SiO 2 ) insulating barrier, while power isolation uses on-chip transformers separated by thin-film polymer as insulation. Various forward and reverse channel configurations are available. The default output for ISOW7821 devices is high if the input signal is lost, and low for devices with an F suffix (see Device Characteristics).

These devices help prevent noise currents on the data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuits. Through innovative chip design and layout techniques, the electromagnetic compatibility of the ISOW7821 device has been significantly enhanced to simplify system-level ESD, EFT, surge and emissions compliance. The high efficiency of the power converter allows operation at higher ambient temperatures. The ISOW7821 device is available in a 16-pin SOIC wide body (SOIC-WB) DWE package.


●Integrated high-efficiency DC-DC converter with on-chip transformer

●100 Mbps data rate

●Sturdy isolation barrier:

○ Expected lifetime > 100 years at 1 kV RMS operating voltage

○ Up to 5000 V RMS isolation rating

○Up to 10 kV PK surge capability

○±100 kV/μs minimum CMTI

●3V to 5.5V wide input power range

●Regulated 5V or 3.3V output

●Up to 0.65W output power

5V to 5V; 5 V to 3.3 V: Available load current ≥ 130 mA

3.3 V to 3.3 V: Available load current ≥ 75 mA

● Soft start to limit inrush current

●Overload and short circuit protection

● Thermal shutdown

● Default output: high and low options

Low propagation delay: 13 ns typical (5V supply)

●Strong Electromagnetic Compatibility (EMC)

○System level ESD, EFT and surge immunity

○±8 kV IEC 61000-4-2 Contact discharge protection across isolation barrier

○Low emissions

16-pin wide SOIC package

●Extended temperature range: –40°C to +125°C

●Security related certification:

○7071-V PK reinforced isolation according to DIN VDE V 0884-11:2017-01

○ 5000V RMS isolation for 1 minute, in accordance with UL 1577

○ CSA certified to IEC 60950-1, IEC 62368-1 and IEC 60601-1 end equipment standards

○CQC certification conforming to GB4943.1-2011

○TUV certified according to EN 60950-1, EN62368-1 and EN 61010-1


●Industrial automation

● Motor control

●Grid infrastructure

●Medical equipment

●Test and measurement


Type: Digital Isolator

Data Rate (Max) (Mbps): 100

Isolation Level (Vrms): 5000

Surge Voltage Capability (Vpk): 10000

Operating temperature range (°C): -40 to 125