1. Applying stress that exceeds the
absolute maximum rating
If the voltage or current value for any of
the terminals exceeds the absolute
maximum rating, internal elements will
deteriorate because of the excessive
voltage or current. In extreme cases,
wiring may melt, or silicon P/N junctions
may be destroyed.
As a result, the design should ensure that
the absolute maximum ratings will never
be exceeded, even momentarily.
2. Deterioration and destruction
caused by discharge of static
electricity
This phenomenon is generally called
static electricity destruction, and occurs
when static electricity generated by
various factors is discharged while the
relay terminals are in contact, producing
internal destruction of the element.
To prevent problems from static
electricity, the following precautions and
measures should be taken when using
your device.
1) Employees handling relays should
wear anti-static clothing and should be
grounded through protective resistance
of 500 kΩ
to 1 MΩ.
2) A conductive metal sheet should be
placed over the work table. Measuring
instruments and jigs should be grounded.
3) When using soldering irons, either use
irons with low leakage current, or ground
the tip of the soldering iron. (Use of low-
voltage soldering irons is also
recommended.)
4) Devices and equipment used in
assembly should also be grounded.
5) When packing printed circuit boards
and equipment, av oid using high-polymer
materials such as foam styrene, plastic,
and other materials which carry an
electrostatic charge.
6) When storing or transporting relays,
the environment should not be conduciv e
to generating static electricity (for
instance, the humidity should be between
45 and 60%), and relays should be
protected using conductive packing
materials.
4. Short across terminals
Do not short circuit between terminals
when relay is energized, since there is
possibility of breaking of the internal IC.
5. Output spike voltages
1) If an inductive load generates spike
voltages which exceed the absolute
maximum rating, the spike voltage must
be limited. Typical circuits are shown
below.
2) Even if spik e v oltages generated at the
load are limited with a clamp diode if the
circuit wires are long, spike voltages will
occur by inductance . Keep wires as short
as possible to minimize inductance.
6. Ripple in the input power supply
If ripple is present in the input power
supply, observe the following:
1) For LED operate current at Emin,
maintain min. 5 mA.
2) Keep the LED operate current at 50
mA or less at Emax.
7. Cleaning solvents compatibility
The PhotoMOS relay forms an optical
path by coupling a light-emitting diode
(LED) and photodiode via transparent
silicon resin. F or this reason, unlike other
directory element molded resin products
(e.g., MOS transistors and bipolar
transistors), avoid ultrasonic cleansing if
at all possible. We recommend cleaning
with an organic solvent. If you cannot
avoid using ultrasonic cleansing, please
ensure that the following conditions are
met, and check beforehand for defects.
•Frequency: 27 to 29 kHz
•Ultrasonic output:
No greater than 0.25W/cm2
•Cleaning time:
No longer than 30 s
• Cleanser used: Asahiklin AK-225
• Other:
Submerge in solvent in order to prevent
the PCB and elements from being
contacted directly by the ultrasonic
vibrations.
Note: Applies to unit area ultrasonic output f or
ultrasonic baths.
1
2
16
Load
15
1
2
16
Load
15
Add a clamp
diode to
the load
Add a CR
snubber
circuit to
the load
Emin. Emax.
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