ISO7420, ISO7420M

ISO7421, ISO7421M

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SLLS984A – JUNE 2009 – REVISED DECEMBER 2009

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

0.008

mm

clearance)

the barrier tied together creating a two-terminal device,

Ω

Isolation resistance

Input to output

Ω

Barrier capacitance, input to output

1

pF

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

(1)

over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

SPECIFICATION

UNIT

Maximum working insulation voltage

560

V

Input-to-output test voltage

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

1050

V

t = 60 s (qualification)

Transient overvoltage

4000

V

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

(1)

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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