ISO642x General-Purpose, Basic and Reinforced, Dual-Channel Digital Isolators

1 Features

• Up to 150Mbps data rate

• Robust SiO2 isolation barrier:

– Up to 5000VRMS isolation rating

– Up to 10.4kV surge capability

– Up to ±250kV/μs typical CMTI

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

ambient operating

• Supply range: 2.25V to 5.5V

• Overvoltage Tolerant Inputs

• Default output high ( ISO642x ) and low

( ISO642xF ) 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

• SOIC (D-8) Package

• Wide-SOIC (DWV-8) Package

• Safety-Related Certifications (Planned):

– 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 certifications

2 Applications

• Power supplies

• Grid, Electricity meter

• Motor drives

• Factory automation

• Building automation

• Lighting

• Appliances

3 Description

The ISO642x 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, CSA, and CQC.

The ISO642x devices provide high EMC performance

while isolating CMOS or LVCMOS digital I/Os.

ISO642x uses SiO2 as the isolation barrier. Each

isolation channel has a logic input and output buffer

separated by the insulation barrier.

The ISO6420 and ISO6420F devices have all

channels in the forward direction. The ISO6421

and ISO6421F 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)

ISO6420 , ISO6420F

ISO6421 , ISO6421F

SOIC (D-8)

6mm × 4.9mm

ISO6420 , ISO6420F

ISO6421 , ISO6421F

Wide-SOIC

(DWV-8)

11.5mm × 5.85mm

(1)

For more information, see Section 12.

(2)

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

includes pins, where applicable.

OUTx

GNDO

GNDI

V

CCO

V

CCI

INx

VCCI=Input supply, VCCO=Output supply

GNDI=Input ground, GNDO=Output ground

Simplified Schematic

ISO6420, ISO6421

SLLSG12 – AUGUST 2025

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. ADVANCE INFORMATION for preproduction products; subject to change

without notice.