HCPL-7720 Datasheet, PDF (5/18 Pages) Agilent(Hewlett-Packard) – 40 ns Propagation Delay CMOS Optocoupler

Insulation and Safety Related Specifications
Value
Parameter
Symbol 772X 072X
Minimum External Air
Gap (Clearance)
L(I01) 7.1
4.9
Minimum External
Tracking (Creepage)
L(I02) 7.4
4.8
Minimum Internal Plastic
Gap (Internal Clearance)
0.08 0.08
Tracking Resistance
CTI
≥175 ≥175
(Comparative Tracking
Index)
Isolation Group
IIIa
IIIa
Units
mm
mm
mm
Volts
Conditions
Measured from input terminals to output
terminals, shortest distance through air.
Measured from input terminals to output
terminals, shortest distance path along body.
Insulation thickness between emitter and
detector; also known as distance through
insulation.
DIN IEC 112/VDE 0303 Part 1
Material Group (DIN VDE 0110, 1/89,
Table 1)
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.
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