Datasheet

Common Precautions for All MOS FET Relays
54
DIP
SOP
SSOP
USOP
VSON
S-VSON
General-purpose
Introduction
High-load-voltage Multi-contact-pair
(2a, 2b, and 1a1b)
High-current and
Low-ON-resistance
Small and High-
dielectric-strength
High-dielectric-
strength
Current-limiting
Low-output-capacitance
and Low-ON-resistance
Small and High-
load-voltage
Certified Models with
Standards Certification
Common Precautions for All MOS FET Relays
Always turn OFF the power supply before wiring
a Relay.
Not doing so may cause electrical shock.
Do not touch the current-carrying parts of the pin
section of a MOS FET Relay while the power is
being supplied.
An electrical shock may occur.
1. Do not apply overvoltages or overcurrents to the input or
output circuit of the MOS FET Relay.
The MOS FET Relay may fail or ignite.
2. Perform soldering and wiring correctly according to specified
soldering conditions.
Using a MOS FET Relay with incomplete soldering may cause
overheating when power is applied, possibly resulting in
burning.
●Derating
You must consider derating to achieve the required system
reliability.
To use a MOS FET Relay with high reliability, consider derating
the maximum ratings and recommended operating conditions,
and allow sufficient leeway in designs based on testing operation
in the actual application under the actual operating conditions
whenever possible.
(1) Maximum Ratings
The maximum ratings must never be exceeded even
instantaneously. This applies individually to each of the
ratings. If any of the maximum ratings is exceeded, the internal
parts of the MOS FET Relay may deteriorate or the chip may
be destroyed. To ensure high reliability in using a MOS FET
Relay, sufficiently derate the maximum voltage, current, and
temperature ratings when designing the application.
(2) Recommended Operating Conditions
The recommended operating conditions are to ensure that
the MOS FET Relay turns ON and OFF reliably.
To ensure high reliability in using a MOS FET Relay,
consider the recommended operating conditions when you
design the application.
(3) Fail-safe Design
We recommend that you implement fail-safe measures in
the design of the application if the failure of, deterioration of
characteristics in, or functional errors in the MOS FET Relay
will have a serious affect on the safe operation of the
system.
●Countermeasures for static electricity
There is a risk of damage to internal elements and impairment of
functionality if static electricity is discharged to the pins due to
product handling or otherwise.
Reduce the generation of static electricity as much as possible,
and implement appropriate measures to prevent charge
accumulation near the product.
●Typical MOS FET Relay Driving Circuit Examples
The LED input side of the MOS FET is driven by current. If
applying a Voltage, add resistance in series with the circuit, so
the specified current is applied.
This resistance is referred as "LED current limiting resistance".
• To ensure that the MOSFET relay operates correctly, use the
following formula to calculate the limiting resistance, and
design the circuit accordingly.
Note: To set the value of IF(ON), check the trigger LED current and
recommended operation LED forward current indicated in the
catalogue for each model, and set a high value with leeway.
• To ensure that the MOSFET relay resets reliably, calculate the
reset voltage using the formula below, and control so that the
voltage is lower than this value.
Note: For the IF(OFF) value, set a value that is lower with leeway than the
reset LED forward current indicated for each model in the catalogue.
• If the drive transistor has a large leakage current that may
cause malfunctioning, add a bleeder resistance.
●Protection from Surge Voltage on the Input Pins
• If any reversed surge voltage is imposed on the input pins,
insert a diode in parallel with the input pins as shown in the
following circuit diagram and do not impose a reversed voltage
of 3 V or higher.
WARNING
Precautions for Safe Use
Precautions for Correct Use
6
5
4
1
2
3
Load
10 to 100 kΩ
(bleeder resistor)
+Vcc
V
F
VIN
VOL/OH
R1
C-MOS
6
5
4
1
2
3
Load
+Vcc
V
F
VIN
VOL/OH
R1
C-MOS
Transistor
R1 =
VCC − VOL − VF(ON)
IF
VF(OFF)=VCC − IFR1 − VOH
6
5
4
1
2
3
Surge Voltage Protection Circuit Example