HCPL-0721 datasheet(5/18 Pages) HP

5 / 18 page

All Agilent data sheets report the

creepage and clearance inherent

to the optocoupler component

itself. These dimensions are

needed as a starting point for the

equipment designer when

determining the circuit insulation

requirements. However, once

mounted on a printed circuit

board, minimum creepage and

clearance requirements must be

met as specified for individual

equipment standards. For

creepage, the shortest distance

path along the surface of a

printed circuit board between the

solder fillets of the input and

output leads must be considered.

There are recommended

techniques such as grooves and

ribs which may be used on a

printed circuit board to achieve

desired creepage and clearances.

Creepage and clearance distances

will also change depending on

factors such as pollution degree

and insulation level.

Insulation and Safety Related Specifications

Value

Parameter

Symbol

772X

072X

Units

Conditions

Minimum External Air

L(I01)

7.1

4.9

Measured from input terminals to output

Gap (Clearance)

terminals, shortest distance through air.

Minimum External

L(I02)

7.4

4.8

Measured from input terminals to output

Tracking (Creepage)

terminals, shortest distance path along body.

Minimum Internal Plastic

0.08

Insulation thickness between emitter and

Gap (Internal Clearance)

detector; also known as distance through

insulation.

Tracking Resistance

CTI

≥175

Volts

DIN IEC 112/VDE 0303 Part 1

(Comparative Tracking

Index)

Isolation Group

IIIa

Material Group (DIN VDE 0110, 1/89,

Table 1)

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