Broadcom

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ACPL-352J

Data Sheet

Insulation and Safety Related Specifications

NOTE

All Broadcom 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 (the

recommended Land Pattern does not necessarily meet the minimum creepage of the device). 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 also change depending on factors such as

pollution degree and insulation level.

Parameter

Symbol

ACPL-352J

Unit

Conditions

Minimum External Air Gap

(Clearance)

L(101)

8.3

mm

Measured from input terminals to output terminals, shortest

distance through air.

Minimum External Tracking

(Creepage)

L(102)

8.3

mm

Measured from input terminals to output terminals, shortest

distance path along body.

Minimum Internal Plastic Gap

(Internal Clearance)

0.5

mm

Through insulation distance conductor to conductor, usually the

straight line distance thickness between the emitter and detector.

Tracking Resistance

(Comparative Tracking Index)

CTI

>175

V

DIN IEC 112/VDE 0303 Part 1.

Isolation Group

IIIa

Material Group (DIN VDE 0110, 1/89, Table 1).