246

Ultra-small Tactile Switch

B3U

Precautions

Be sure to read the precautions common to all Tactile Switches, contained in the Technical User’s Guide, “Tactile Switches, Technical Information”

for correct use.

■ Precautions for Correct Use

Soldering

Perform reflow soldering within the ranges shown in the terminal tem-

perature profile in the following diagram.

Washing

B3U Switches 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.

Compliance with RoHS Directive

The “RoHS Compliant” designation indicates that the product does

not contain the following six hazardous substances covered by the

RoHS Directive.

Reference: The following standards are used to determine compli-

ance for the six substances.

Lead:1,000 ppm max.

Mercury:1,000 ppm max.

Cadmium:100 ppm max.

Hexavalent chromium:1,000 ppm max.

PBB:1,000 ppm max.

PBDE:1,000 ppm max.

Storage and Operating Environment

Do not store the product under the following conditions to prevent

discoloration and other deterioration of the terminals.

1. Locations subject to high temperatures or humidity

2. Locations containing corrosive gases

3. Locations subject to direct sunlight

The Switch is not provided with a watertight or drip-proof construc-

tion. Do not install or operate the product in locations subject to water

spray or splashes.

Packaging Specifications

The specifications for B3U Switches packaged on embossed tape

are as follows:

B3U-1000 Series

B3U-3000 Series

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 mal-

function. (Maximum force = 30N)

Be sure to set up the Switch so that the plunger will be pressed

straight in. The life of the Switch may be reduced if the plunger is

pressed off-center or from an angle. Do not apply pressure from

above or below the plunger. Doing so may deform or damage parts

or cause faulty operation.

Do not operate the plunger from the side. Doing so may deform or

damage the Switch.

180

220

260 max.

150

Preheating time

Heating

time

Time (s)

60 to 120

60 max.

Standards

Conforms to JEITA.

Package

3,500 Switches (B3U-1000 Series)

4,000 Switches (B3U-3000 Series)

Heat resistance

50

°C for 24 hours (without deformation)

13 dia.

Reel

Label

Tape drawing

direction

(19)

330

12

5.5

1.75

2

2.55

Tape drawing direction

1.5

dia.

+0.1

0

13 dia.

Label

Tape drawing

direction

(19)

Reel

330

5.5

2.2

2

12

1.75

Tape drawing direction

1.5

dia.

+0.1

0