No external transformer or secondary power supply required! Built-in isolation power supply isolator (Si86Px)

Built-in isolated power supply, external transformer type isolated power supply, power capacity, high-efficiency isolated power supply built-in isolator, isolator, gate driver, ISO, ISOW,

Product Summary

The Si86Px family is an isolated power supply isolator that integrates a digital isolator and an isolated DC-DC converter into a single package.
By combining the conventional "signal isolator + isolated DC/DC power supply for the secondary side" configuration into a single Si86Px, it contributes to reducing the number of components, miniaturizing the circuit board, and simplifying the design.
Thanks to its built-in isolated DC-DC converter, it can supply up to 0.5 W (peak) of isolated power to the secondary side using only the power input from the primary side.
The secondary side ADC and logic circuits can be configured without using an external power supply.

The signal isolation channels are available in 2-channel and 4-channel configurations, and various variations with different input/output directions are also available, allowing support for a wide range of interfaces, including SPI and various control signals.

This product family is suitable for a wide range of applications that require both signal isolation and secondary power supply, such as industrial equipment, PLCs, motor controls, and inverters.

* If you require power in the 0.5 to 2.0 W range, please consider the Si88xx family with an external transformer.

Product features

Supports high-speed signals up to 150 Mbps with low propagation delay (Max 15 ns).
High CMTI (Min 100 kV/us)
2/4ch, Default Hi/Low output options
The built-in isolated DC-DC converter allows for the generation of a 3.3/5.0 V secondary power supply (maximum 0.5 W peak).
A thermal protection function that detects overheating in the power transmission section and shuts off power transmission in the event of an abnormality on either the input or output side.
The timeout function periodically shuts down the primary side even if feedback stops due to secondary side abnormalities or noise, preventing overheating and device degradation.
For overvoltage protection, an active clamping circuit on the secondary side limits the output voltage fluctuation to within 10%, protecting the external load.
WB SOIC-16, WB SOIC-20 package (Creepage 7.6mm)
Wide operating temperature range (TA = -40 to 125°C)

Each lineup

Input Supply Voltage	Output Supply Voltage	Channels(For/Rev)	Default Output State	Isolation Rating	PKGs
3.3V	3.3V	2/0, 1/1	High/Low	3.75 kVrms	WB SOIC-16
3.3 ~ 5.0 V	3.3V	2/0, 1/1	High/Low
5.0 V	3.3/5.0 V	2/0, 1/1	High/Low
3.3V	3.3V	4/0, 3/1, 2/2	High/Low		WB SOIC-20
3.3 ~ 5.0 V	3.3V	4/0, 3/1, 2/2	High/Low
5.0 V	3.3/5.0 V	4/0, 3/1, 2/2	High/Low

Application example

Digital isolators, isolated power supplies,

Isolation configuration for SPI communication using Si86Px

This circuit example uses Si86Px to isolate signals from SPI communication and to the secondary circuit.

This is an example of a configuration that simultaneously supplies power.

The built-in isolated DC-DC converter controls the secondary AD converter.

It can be powered without an external power supply.

Target application

Industrial automation systems　
- Motor, Inverter
-PLC system
-Battery Management System (BMS)
• In-vehicle applications
-HEV (Hybrid Electric Vehicle) related systems　
-In-vehicle communication systems such as CAN and peripheral power circuits　
Signal isolation
- Digital signal isolation
- Data acquisition system