10

100

0

250

500

750

1000

V

– Working Voltage – V

IORM

880

120

V

at 566 V

IORM

28 Years

G001

1

2

3

4

8

7

6

5

INA

INB

OUTA

OUTB

VCC2

0.1 µF

GND2

0.1 µF

VCC1

GND1

ISO7421-EP

www.ti.com

SLLSEN3 – DECEMBER 2015

Typical Application (continued)

9.2.2 Detailed Design Procedure

ISO7421 digital isolator containing two channels has logic input and output buffer isolated by silicon dioxide

(SiO2) isolation barrier. When using ISO7421 in conjunction with isolated power supplies, these devices prevent

noise currents on a data bus or other circuit from entering the local ground and interfering with or damaging

sensitive circuitry. ISO7421 are specified for signaling rate up to 1Mbps. These devices also transmit data with

much shorter pulse widths, in most cases, because of their fast response time. Designer must add external

filtering to remove spurious signals with input pulse duration < 20 ns.

Figure 13. Typical ISO7421-EP Circuit Hookup

9.2.3 Application Curve

Figure 14. Life Expectancy vs Working Voltage

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