8
Insulation and Safety Related Specifications
Value
Parameter
Symbol
Units
Conditions
HCPL-4504 HCPL-J454 HCPL-0454 HCNW4504
Minimum External L(101)
Air Gap (External
Clearance)
7.1
7.4
4.9
9.6
mm Measured from input
terminals to output
terminals, shortest
distance through air.
Minimum External L(102)
Tracking (External
Creepage)
7.4
8.0
4.8
10.0
mm Measured from input
terminals to output
terminals, shortest
distance path along
body.
Minimum Internal
Plastic Gap
(Internal Clearance)
0.08
0.5
0.08
1.0
mm Through insulation
distance, conductor
to conductor,
usually the direct
distance between the
photoemitter and
photodetector inside
the optocoupler
cavity.
Minimum Internal
Tracking (Internal
Creepage)
NA
NA
NA
4.0
mm Measured from input
terminals to output
terminals, along
internal cavity.
Tracking Resistance CTI
(Comparative
≥ 175
≥ 175
≥ 175
≥ 200
Volts DIN IEC 112/VDE
0303 Part 1
Tracking Index)
Isolation Group
IIIa
IIIa
IIIa
IIIa
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
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.
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
determining the circuit insulation
requirements.
However, once mounted on a
printed circuit board, minimum
techniques such as grooves and
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
