1 Features
• Data rates
– ISOW3080 and ISOW3080P : 500kbps
– ISOW3086 and ISOW3086P : 12Mbps
• Integrated best in class emissions DC-DC
converter
– Meets CISPR 32 Class B with margin on a twolayer
PCB
• High efficiency output power
– Typical efficiency: 41.5%
– VISOOUT accuracy: ±10%
• Independent power supply for RS-485 and DC-DC
– Logic supply (VDDL): 2.25V to 5.5V
– Power converter supply ( VDD): 3V to 5.5V
• RS485 compatibility on ISOW3080 and ISOW3086
with 3.3V VISOOUT.
• PROFIBUS compatibility on ISOW3080P and
ISOW3086P with 5V VISOOUT.
• High-performance with integrated protection
– Open, short, and idle bus failsafe
– 1/8 unit load: up to 256 nodes on bus
– Glitch-free power up and power down
• Reinforced and Basic isolation options
• High ESD bus protection
– HBM: ±16kV
– IEC 61000-4-2 contact discharge: ±8kV
• Operating temperature range: -55°C to 125°C
• Current limit and thermal shutdown
• 16-pin wide SOIC package
• Safety Related Certifications:
– DIN EN IEC 60747-17 (VDE 0884-17)
– UL 1577 component recognition program
– IEC 62368-1, IEC 61010-1, IEC 60601-1 and
GB 4943.1-2011 certifications

2 Applications
• Factory automation
• Building automation
• Industrial transport
• Solar inverters, protection relay
• Motor drives

3 Description
The ISOW308x devices are isolated RS-485/RS-422
transceivers with a built-in isolated DC-DC converter,
that eliminates the need for a separate isolated
power supply in space constrained isolated designs.
The low-emissions, isolated DC-DC converter meets
CISPR 32 radiated emissions Class B standard on a
simple two-layer PCB.
Two options of data rates are provided: ISOW3080
is optimized for maximum 500kbps and ISOW3086
is designed for maximum 12Mbps data rate. These
devices do not require any external components
other than supply decoupling capacitors to realize
an isolated RS-485 port, best for long distance
communications. Isolation breaks the ground loop
between the communicating nodes, allowing for a
much larger common mode voltage range. Both signal
and power paths are 5kVRMS isolated per UL1577
and are qualified for reinforced and basic isolation per
VDE, TUV and CQC. The bus pins of these devices
can endure up to 16kV of HBM stress.
The ISOW308x can operate from a single supply
voltage of 3V to 5.5V by connecting VDDL and VDD
together on PCB. If lower logic levels are required,
2.25V to 5.5V logic supply (VDDL) can be separated
and independent from the power converter supply
(VDD) of 3V to 5.5V. These devices support a wide
operating ambient temperature range from –55°C to
+125°C and are available in 16-pin DWE (SOIC-16
footprint compatible package) offering a minimum of
8mm creepage and clearance.