Common Precautions for Tactile Switch

Tactile Switch
Safety Precautions
Precautions
■Precautions for Safe Use
3. Usage Environment
Use the Switch within the rated voltage and current ranges,
otherwise the Switch may have a shortened life expectancy,
radiate heat, or burn out. This particularly applies to the
instantaneous voltages and currents when switching.
■Precautions for Correct Use
● Storage
Storage Environment
To prevent degradation, such as discoloration, in the terminals
during storage, do not store the Switch in locations that are
subject to the following conditions.
1. High temperature or humidity
2. Corrosive gases
3. Direct sunlight
Storage condition
Store the Switches in the packaging box.
After the packaging box is opened, use the contents as quickly as
possible. When storing leftover parts, make sure that appropriate
measures are taken against humidity and corrosive gases.
● Handling
1. Operation
Do not repeatedly operate the Switch with excessive force.
Applying excessive pressure or applying additional force after the
plunger has stopped may deform the contact dome of the Switch,
resulting in malfunction. In particular, applying excessive force to
Side-operated Switches may damage the caulking, which in turn
may damage the Switch. Do not apply force exceeding the
maximum (29.4 N {300 gf} for 1 minute, one time) when installing
or operating Side-operated Switches.
Be sure to set up the Switch so that the plunger will operate in a
straight vertical line. A decrease in the life of the Switch may
result if the plunger is pressed off-center or from an angle.
Operating part
Plunger
Incorrect Incorrect
Correct
Tactile Switch is not recommended to use for detection purpose
due to the sort of Manual Switch. Omron's Detection Switch is
recommended for this purpose.
2. Dust Protection
Do not use Switches that are not sealed in dust-prone
environments. Doing so may cause dust to penetrate inside the
Switch and cause contact failure. If a Switch that is not sealed
must be used in this kind of environment, use a sheet or other
measure to protect it against dust.
Resin sheet
Switch
Before installing the Switch, make sure that the area of
installation is not subject to corrosive gases emitted from
surrounding parts.
Do not use in areas subject to high temperatures, high humidity,
or toxic gases such as sulfuric gas (H2S, SO2), ammonia gas
(NH3), nitric gas (HNO3), or chlorine gas (CI2). It can cause
corrosive damage to the contacts and result in malfunction.
If there is silicon in the atmosphere, it may stop the contacts from
functioning properly.
If silicon products, such as silicon oil, silicon filler, or silicon wires,
are used in the surrounding area, install a contact protection
circuit to prevent arching or remove the silicon source.
The following situations may cause water to enter inside the
Switch, resulting in a malfunction due to contact failure or
corrosion.
• Using the Switch in an outdoor environment where it is
exposed to water drops for an extended period of time.
• Using the Switch in an underwater setting where it is subject to
strong water pressure.
Do not use Switches that have been dropped. The mating section
or other internal parts may be damaged, resulting in malfunction.
● PCBs
The Switch is designed for a 1.6-mm thick, single-side PCB.
Using PCBs with a different thickness or using double-sided,
through-hole PCBs may result in loose mounting, improper
insertion, or poor heat resistance in soldering. These effects will
occur, depending on the type of holes and patterns of the PCB.
Therefore, it is recommended that a verification test is conducted
before use.
If the PCBs are separated after mounting the Switch, particles
from the PCBs may enter the Switch. If PCB particles or foreign
particles from the surrounding environment, workbench,
containers, or stacked PCBs become attached to the Switch,
contact failure may result.
● Soldering
1. General Precautions
Before soldering the Switch on a multilayer PCB, test to confirm
that soldering can be performed properly. Otherwise the Switch
may be deformed by the soldering heat on the pattern or lands of
the multilayer PCB.
Do not solder the Switch more than twice, including rectification
soldering. An interval of five minutes is required between the first
and the second soldering.
2. Automatic Soldering Baths (B3F, B3W, B3WN,
B3M, B3J)
Soldering temperature: 260°C max.
Soldering time: 5 s max. for a 1.6-mm thick single-side PCB
Preheating temperature: 100°C max. (ambient temperature)
Preheating time: Within 60 s
Make sure that no flux will rise above the level of the PCB. If flux
overflows onto the mounting surface of the PCB, it may enter the
Switch and cause a malfunction.
PCB surface
Flux surface
1
Tactile Switch
Safety Precautions
3. Reflow Soldering (Surface Mounting)
3. Washing Agents
Solder the terminals within the heating curve shown in the
following diagram.
Apply alcohol-based solvents to clean washable models. Do not
apply any other agents or water to clean any washable model, as
such agents may degrade the materials or performance of the
Switch.
Temperature ( °C)
B3S, B3SN, B3FS
4. Washing Precautions
250 max.
220
180
Heating
Preheating
150
Room
temperature
Do not impose any external force on washable models while
washing.
Do not clean washable models immediately after soldering. The
cleaning agent may be absorbed into the Switch through
respiration as the Switch cools. Wait for at least three minutes
after soldering before cleaning washable models.
Do not use Sealed Switches while submersed in water or in
locations exposed to water.
● Switch Packaging (Taping Specification Models)
1. Radial Types
60 to 120
Max. 60 Time (s)
The tape is packaged by fan-folding into the box, as shown in the
following diagram.
B3SL, B3U, B3AL
Temperature (°C)
Switches on taping
Packaging box
Fan-folded tape
260 max.
C
220
B
180
A
150
Heating
Preheating
Model
60 to 120
60 max.
Time (s)
Note: The above heating curve applies if the PCB thickness is 1.6 mm.
The peak temperature may vary depending on the reflow bath
used. Confirm the conditions beforehand.
Do not use an automatic soldering bath for surface-mounted
Switches. The soldering gas or flux may enter the Switch and
damage the Switch’s plunger operation.
4. Manual Soldering (All Models)
Soldering temperature: 350°C max. at the tip of the soldering iron
Soldering time: 3 s max. for a 1.6-mm thick, single-side PCB
Before soldering the Switch on a PCB, make sure that there is no
unnecessary space between the Switch and the PCB.
● Washing
1. Washable and Non-washable Models
Washable (sealed types)
B3W, B3WN, B3S, B3SN
Non-washable (standard types)
B3F, B3FS, B3SL, B3W-9, B3J,
B3M, B3U, B3AL
Standard Switches are not sealed, and cannot be washed. Doing
so will cause the washing agent, together with flux or dust
particles on the PCB, to enter the Switch, resulting in malfunction.
2. Washing Methods
Washing equipment incorporating more than one washing bath
can be used to clean washable models, provided that the
washable models are cleaned for one minute maximum per bath
and the total cleaning time does not exceed three minutes.
2
A
B
C
B3F
50 mm
325 mm
275 mm
B3WN
53 mm
326 mm
350 mm
Do not apply any external force to the packaging box, or subject it
to vibration. Doing so may deform the Switch terminals.
Remove the tape slowly, making sure that the Switches are not
entangled or caught. Otherwise the terminals may be deformed.
Do not store the packaged Switches in locations subject to high
temperatures or high humidity. The packaging boxes are sealed
with paper tape and are not airtight. Storing the packaged
Switches in locations with high temperature or high humidity may
result in deterioration of the tape and Switches, and long-term
storage under such conditions may cause discoloration of the
Switch terminals.
Tactile Switch
Safety Precautions
2. Packaging Specifications for Embossed Taping
<B3FS-1050P>
Label
(22)
Tape drawing direction
<B3FS-1000P, B3SN>
Label
(18)
Tape drawing direction
13 dia.
380±2 dia.
Reel (made of paper)
13 dia.
380±2 dia.
Reel
8±0.1
4±0.1
1.5 +0.1
0 dia.
1.5 +0.1
0 dia.
2
12±0.1
4±0.1
1.75±0.1
2
(8.1)
A
1.75±0.1
7.5
Model
A
B3FS-1000P
3.9
mm
B3SN
3.6
mm
5.5
16±0.3
12±0.3
Tape drawing direction
Tape drawing direction
Standards
Conforms to JEITA.
Package
3,000 Switches
Heat resistance
50°C for 24 hours (without deformation)
Note: Switches with ground terminals are packaged with the ground
terminal on the side of the guide hole.
Standards
Conforms to JEITA.
Package
1,000 Switches
Heat resistance
60°C for 24 hours (without deformation)
<B3SL-1002P/1005P>
(22)
Label
Tape drawing
direction
+0.1
0 dia.
1.5
2
12±0.1
4±0.1
(3.7)
1.75
<B3FS-1010P>
(22)
Tape drawing direction
Label
7.5
16
380±2
dia.
13 dia.
Tape drawing direction
Reel (Material: PS)
<B3SL-1022P/1025P>
(22)
Label
Tape drawing
direction
+0.1
0 dia.
1.5
2
12±0.1
4±0.1
(5.3)
1.75
13 dia.
Reel
(Made of paper)
330 dia.
7.5
16
1.5 +0.1
0 dia.
12±0.1
4±0.1
2
380±2
dia.
13 dia.
(4.7)
1.75
Reel (Material: PS)
Tape drawing direction
7.5
16
Standards
Conforms to JIS.
Package
2,000 Switches (B3SL-1002P/1005P)
1,400 Switches (B3SL-1022P/1025P)
Heat resistance
60°C for 24 hours (without deformation)
Tape drawing direction
Standards
Conforms to JEITA.
Package
1,000 Switches
Heat resistance
60°C for 24 hours (without deformation)
3
Tactile Switch
Safety Precautions
● LEDs (B3J)
<B3S>
21.5
Tape drawing direction
Make sure that the polarity of the LEDs is correct. The polarity is
not indicated on the Switch, but the positive pole is located on the
back surface of the Switch on the side without the OMRON mark.
Connect limiting resistors to the LEDs. The Switch does not have
built-in limiting resistors, so satisfy the LED characteristics by
obtaining the limiting resistance according to the following formula
based on the voltage to be used.
330 dia.
13 dia.
Limiting resistance (R)=
(Voltage used (E) – LED forward voltage (VF))
(Ω)
LED forward current (IF)
Reel
E
Label
1.5 +0.1
0 dia.
1.75
2
IF
7.5
1.5
Tape drawing direction
9.4
0.06
50
Forward current IF (mA)
16
7
8.7
VF
R
12±0.1
4±0.1
0.4
40
Red
30
4.7
Yellow/Green
20
Standards
Conforms to JEITA.
Package
1,000 Switches
Heat resistance
50°C for 24 hours (without deformation)
10
Note: Switches with ground terminals are packaged with the ground
terminal on the opposite side of the guide hole.
0
−20
<B3U-1000 Series>
Tape drawing 1.5 +0.1 dia.
0
direction
13 dia.
8+0.1
4+0.1
2
12±0.3
330±2 dia.
Label
Tape drawing direction
80
30
Green
Yellow
10
5
+0.1
Tape drawing
1.5 0 dia.
direction
13 dia.
60
50
<B3U-3000 Series>
(19)
40
2.55
1.75±0.1
5.5
Reel
20
Ambient temperature Ta (°C)
Forward current IF (mA)
(19)
0
8+0.1
2
4+0.1
2.2
1.75±0.1
3
5.5
Red
1
12±0.3
0.5
1.5
Reel
330±2 dia.
Label
Standards
2.0
2.1
50°C for 24 hours (without deformation)
<B3AL Series>
(22)
Tape drawing direction
1.5
+0.1
0
dia.
2
12±0.1
4±0.1
C
Cross section
C-C
1.75
13
38
0±
2
dia
di
7.50
.
Reference:
The following standards are used to determine compliance for the
six substances.
Lead:
1,000 ppm max.
Mercury:
1,000 ppm max.
Cadmium:
100 ppm max.
16
a.
C
Tape drawing direction
Standards
Comforms to JEITA.
Package
1,400 Switches
Heat resistance
50°C for 24 hours (without deformation)
4
1.9
The "RoHS Compliant" designation indicates that the listed
models do not contain the six hazardous substances covered by
the RoHS Directive.
4,000 Switches (B3U-3000 Series)
Reel
1.8
● RoHS Compliant
3,500 Switches (B3U-1000 Series)
Heat resistance
1.7
Forward voltage VF (V)
Conforms to JEITA.
Package
1.6
Tape drawing direction
(5.5)
Hexavalent chromium: 1,000 ppm max.
PBB:
1,000 ppm max.
PBDE:
1,000 ppm max.
Tactile Switch
Safety Precautions
• Application examples provided in this document are for reference only. In actual applications, confirm equipment functions and safety before using the product.
• Consult your OMRON representative before using the product under conditions which are not described in the manual or applying the product to nuclear control systems, railroad
systems, aviation systems, vehicles, combustion systems, medical equipment, amusement machines, safety equipment, and other systems or equipment that may have a serious
influence on lives and property if used improperly. Make sure that the ratings and performance characteristics of the product provide a margin of safety for the system or
equipment, and be sure to provide the system or equipment with double safety mechanisms.
Note: Do not use this document to operate the Unit.
OMRON Corporation
ELECTRONIC AND MECHANICAL COMPONENTS COMPANY
Contact: www.omron.com/ecb
Cat. No. A205-E1-01
0812(0207)(O)
5
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