ISO643x General-Purpose, Basic and Reinforced, Triple-Channel Digital Isolators

1 Features

• Functional Safety-Capable:

– Documentation available to aid IEC 61508

system design

• Up to 150Mbps data rate

• Robust SiO2 isolation barrier:

– High lifetime at up to 1061VRMS and 1500VDC

working voltage

– Up to 5000VRMS isolation rating

– Up to 10.4kV surge capability

– Up to ±200kV/μs minimum CMTI

– Wide temperature range: –40°C to 125°C

ambient operating

• Supply range: 2.25V to 5.5V

• Overvoltage Tolerant Inputs

• Default output high ( ISO643x ) and low

( ISO643xF ) options

• Low propagation delay: 10ns maximum at 5V,

12ns maximum at 3.3V

• Supports SPI up to: 25MHz at 5V, 20.8MHz at

3.3V

• Low pulse width distortion: 1.8ns maximum at 5V,

2.2ns maximum at 3.3V

• Robust electromagnetic compatibility (EMC)

– System-level ESD, EFT, and surge immunity

– Low emissions

• Small Footprint Packages:

– Wide-SSOP (DFP-16) Package

– SSOP (DBQ-16) Package

• Safety-Related Certifications (Planned):

– DIN EN IEC 60747-17 (VDE 0884-17)

– UL 1577 and CSA CAS Notice No. 5A

– IEC 62368-1, IEC 61010-1 and GB 4943.1

certifications

2 Applications

• Power supplies

• Grid, Electricity meter

• Motor drives

• Factory automation

• Building automation

• Lighting

• Appliances

3 Description

The ISO643x devices are general purpose digital

isolators designed for applications requiring up to

5000VRMS isolation rating per UL 1577. The devices

are also certified by VDE, TUV, and CQC.

The ISO643x devices provide high EMC performance

while isolating CMOS or LVCMOS digital I/Os.

ISO643x uses SiO2 as the isolation barrier. Each

isolation channel has a logic input and output buffer

separated by the insulation barrier. These devices

come with enable pins that can be used to put the

respective outputs in high impedance.

The ISO6431 and ISO6431F devices have one

reverse-direction channel.

In the event of input power or signal loss, the default

output is high for devices without the suffix F and

low for devices with the suffix F. See the Device

Functional Modes section for further details.

Package Information

PART NUMBER(1)

PACKAGE

PACKAGE SIZE(2)

ISO6431 , ISO6431F

Wide-SOIC (DW-16) (3)

10.3mm × 10.3mm

Wide-SSOP (DFP-16) (3)

10.3mm × 4.65mm

SSOP (DBQ-16) (3)

6mm × 4.9mm

(1)

For more information, see Mechanical, Packaging, and

Orderable Information.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

(3)

Please refer to Packaging Information table on the Package

Option Addendum page in the Mechanical, Packaging, and

Orderable Information section for Production or Preproduction

status for specific device and package.

OUTx

GNDO

GNDI

V

CCO

V

CCI

INx

ENx

VCCI=Input supply, VCCO=Output supply

GNDI=Input ground, GNDO=Output ground

Simplified Schematic

ISO6431

SLVSJ22 – JUNE 2026

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.