Quad channel standard digital isolators
Quad channel standard digital isolators

Product Details

General Description

The CA-IS374x devices are high-performance four-channel, unidirectional digital isolators with up to 3.75kVRMS (narrow-body package) or 5kVRMS (wide-body package) isolation rating and ultra-fast data rate. The CA-IS374x devices offer high electromagnetic immunity and low emissions at low power consumption, while isolating different ground domains and block high-voltage/high-current transients from sensitive or human interface circuitry. Each isolation channel has a logic input and output buffer separated by capacitive silicon dioxide (SiO2) insulation barrier, the integrated Schmitt trigger on each input provide excellent noise immunity.

The CA-IS374x family offers all possible unidirectional channel configurations to accommodate any 4-channel design, including SPI, RS-485, and digital I/O applications. The CA-IS3740 features 4 channels transferring digital signals in one direction and output enable for the B side is active-high. The CA-IS3741 device has three forward and one reverse-direction channels, making it ideal for applications such as isolated SPI, RS-485 communication. The CA-IS3742 provides further design flexibility with two channels in each direction for isolated RS-232 or other applications. Both CA-IS3741 and CA-IS3742 come with individual enable control pins for each side of the isolator which can be used to put the outputs in high impedance for multi-master driving applications to reduce power consumption.

The CA-IS374x family features default outputs. When the input is either not powered or is open-circuit, the default output is low for devices with suffix L and high for devices with suffix H, see the Ordering Information for suffixes associated with each option.

The CA-IS374x family devices are specified over the -40°C to +125°C operating temperature range and are available in 16-pin SOIC, 16-pin SSOP narrow body packages and 16-pin SOIC wide body package.

Robust Galvanic Isolation of Digital SignalsHigh lifetime: >40 years
Up to 3750 VRMS isolation rating (narrow body packages) and up to 5000 VRMS isolation rating (wide body packages)
±150 kV/μs typical CMTI
Wide operating temperature range: -40°C to 125°C
Schmitt trigger inputs
Interfaces Directly with Most Micros and FPGAsData rate: DC to 150Mbps
Accepts 2.5V to 5.5V supplies
Default output High (CA-IS374xH) and Low (CA-IS374xL) Options
Low Power Consumption1.5mA per channel at 1Mbps with VDD = 5.0V
6.6mA per channel at 100Mbps with VDD = 5.0V
Best in class propagation delay and skew8ns typical propagation delay
1ns pulse width distortion
2ns propagation delay skew (chip -to-chip)
5ns minimum pulse width
No Start-Up Initialization Required
Enable Control Input with internal pull-up
Safety Regulatory ApprovalsVDE 0884-11 Reinforced Isolation
UL According to UL1577
IEC 62368-1, IEC 61010-1, GB 4943.1-2011 and GB 8898-2011 certifications

◎ Industrial Automation
◎ Motor Control
◎ Medical Systems
◎ Isolated Power Supplies
◎ Solar Inverters
◎ Isolated SPI, RS485, CAN etc.

Device information
Part Number Package Package Size (NOM)
SOIC16-NB (N)9.90 mm × 3.90 mm
SOIC16-WB(W)10.30 mm × 7.50 mm
SSOP16-NB(B)4.90 mm × 3.90 mm
Simplified Channel Structure

GNDA and GNDB are the isolated grounds for A side and B side respectively.

Technical Documentation



Last Updated

Certification Standards



Certification Number


Core Values:

Our Goals:


WeChat MP
WeChat Video

Privacy Policy