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■ Soldering
1. General Precautions
Before soldering the Switch on a multilayer PCB, test to confirm that solder-
ing 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 sol-
dering. An interval of five minutes is required between the first and
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 Temp: 100°C max. (ambient Temp.) 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
3. Reflow Soldering (Surface Mounting)
Solder the terminals within the heating curves shown in the following
diagram.
B3FS, B3SN, B3S
Max. 250
220
180
150
Room
temperature
B3SL, B3U, B3AL
260 max.
220
180
150
Preheating
60 to 120
Note: The above heating curves apply 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 dam-
age the Switch's push-button operation.
2
Tactile Switches
Preheating
60 to 120
Max. 60
Time (s)
Heating
60 max.
Time (s)
Technical Information
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)
Non-washable (Standard types)
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 mod-
els are cleaned for one minute maximum per bath and the total
cleaning time does not exceed three minutes.
3. Washing Agents
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.
4. Washing Precautions
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.
■ Tape Packaging
1. Radial Types
The tape is packaged by fan-folding into the box, as shown in the
following diagram.
Switches on taping
C
A
Model
A
B3F
50 mm
B3WN
53 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 tem-
peratures 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 deteri-
oration of the tape and Switches, and long-term storage under such
conditions may cause discoloration of the Switch terminals.
B3W, B3WN, B3S, B3SN
B3F, B3FS, B3SL, B3W-9, B3J, B3M,
B3U, B3AL
Packaging box
Fan-folded tape
B
B
C
325 mm
275 mm
326 mm
350 mm
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