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tactile switches by SHOUHAN
Tactile switch is an on/off electronic switch. Tact switches are tactile electromechanical switches for keyboards, keypads, instruments or interface control-panel applications. Tact switches react to user interaction with the button or switch when it makes contact with the control panel beneath. In most cases this is usually a printed circuit board (PCB).

The feature of tactile switches:
・Crisp clicking by tactile feedback 
・Prevent flux rise by insert-molded terminal 
・Ground terminal is attached 
・Snap-in mount terminal 

Precautions for Safe Use
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
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
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 disc spring 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 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.
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 faulty contact. 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.


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, faulty contact 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 second soldering.
2. Automatic Soldering Baths 
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 fluxoverflows onto the mounting surface of the PCB, it may enter the Switch and cause a malfunction. 
3. Reflow Soldering (Surface Mounting)
Solder the terminals within the heating curve shown in the following diagram.
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 push-button 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
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. 
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.
Switch Packaging
Usually 1000pcs each reel as below image.

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