ISO7420, ISO7420M

ISO7421, ISO7421M

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SLLS984D – JUNE 2009 – REVISED JULY 2010

DEVICE INFORMATION

PACKAGE CHARACTERISTICS

over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

L(I01)

Minimum air gap (clearance)

Shortest terminal-to-terminal distance through air

4.8

mm

Minimum external tracking

Shortest terminal-to-terminal distance across the

L(I02)

4.3

mm

(creepage)

package surface

Tracking resistance (comparative

CTI

DIN IEC 60112 / VDE 0303 Part 1

>175

V

tracking index)

Minimum internal gap (internal

Distance through the insulation

0.014

mm

clearance)

Ω

Isolation resistance, input to

Ω

Barrier capacitance, input to

1

pF

1

pF

(1)

All pins on each side of the barrier tied together creating a two-terminal device.

(2)

Measured from input pin to ground.

NOTE

Creepage and clearance requirements should be applied according to the specific

equipment isolation standards of an application. Care should be taken to maintain the

creepage and clearance distance of a board design to ensure that the mounting pads of

the isolator on the printed-circuit board do not reduce this distance.

Creepage and clearance on a printed-circuit board become equal according to the

measurement techniques shown in the Isolation Glossary. Techniques such as inserting

grooves and/or ribs on a printed circuit board are used to help increase these

specifications.

INSULATION CHARACTERISTICS

(3)

over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

SPECIFICATION

UNIT

Maximum working insulation voltage

560

Vpeak

Input-to-output test voltage

t = 1 s (100% production), partial discharge 5 pC

1050

Vpeak

t = 60 s (qualification)

Transient overvoltage

4000

Vpeak

t = 1 s (100% production)

t = 60 s (qualification)

2500

Isolation voltage per UL

Vrms

t = 1 s (100% production)

3000

Insulation resistance

Ω

Pollution degree

2

(3)

Climatic Classification 40/125/21

Table 2. IEC 60664-1 RATINGS TABLE

PARAMETER

TEST CONDITIONS

SPECIFICATION

Basic isolation group

Material group

III-a

Rated mains voltage

≤ 150 Vrms

I–IV

Installation classification

Rated mains voltage

≤ 300 Vrms

I–III

Rated mains voltage

≤ 400 Vrms

I–II

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