ISO7740 datasheet(2/52 Pages) TI2

2 / 52 page

3 Description

The ISO774x devices are high-performance, quad-channel digital isolators with 5000VRMS (DW package) and

3000VRMS (DBQ package) isolation ratings per UL 1577. This family includes devices with reinforced insulation

ratings according to VDE, CSA, TUV and CQC. The ISO7741B device is designed for applications that require

basic insulation ratings only.

The ISO774x devices provide high electromagnetic immunity and low emissions at low power consumption,

while isolating CMOS or LVCMOS digital I/Os. Each isolation channel has a logic input and output buffer

separated by a double capacitive silicon dioxide (SiO2) insulation barrier. These devices come with enable pins

which can be used to put the respective outputs in high impedance for multi-controller driving applications and

to reduce power consumption. The ISO7740 device has all four channels in the same direction, the ISO7741

device has three forward and one reverse-direction channels, and the ISO7742 device has two forward and two

reverse-direction channels. If the input power or signal is lost, default output is high for devices without suffix F

and low for devices with suffix F. See the Device Functional Modes section for further details.

Used in conjunction with isolated power supplies, these devices help prevent noise currents on data buses, such

as RS-485, RS-232, and CAN, or other circuits from entering the local ground and interfering with or damaging

sensitive circuitry. Through remarkable chip design and layout techniques, electromagnetic compatibility of the

ISO774x devices significantly enhanced to ease system-level ESD, EFT, surge, and emissions compliance. The

ISO774x devices are available in 16-pin SOIC and QSOP packages.

OUTx

GNDO

GNDI

VCCO

VCCI

Series Isolation

Capacitors

INx

ENx

VCCI=Input supply, VCCO=Output supply

GNDI=Input ground, GNDO=Output ground

Simplified Schematic

ISO7740, ISO7741, ISO7742

SLLSEP4J – MARCH 2016 – REVISED OCTOBER 2024

www.ti.com

Submit Document Feedback

Product Folder Links: ISO7740 ISO7741 ISO7742

ISO7740 Datasheet(PDF) 2 Page - Texas Instruments