B3DA-0000-A Omron, B3DA-0000-A Datasheet - Page 2

• Manufacturer Part Number: B3DA-0000-A
• Description: 5mm Sample Sheet(18 Domes Per)
• Manufacturer: Omron
• Series: B3DAr
• Type: Tactile Switchesr

Specifications of B3DA-0000-A

• Circuit: SPST-NO
• Switch Function: Off-Mom
• Contact Rating @ Voltage: 0.01A @ 12VDC
• Actuator Type: Snap Dome
• Mounting Type: Surface Mount
• Orientation: Vertical
• Illumination: Non-Illuminated
• Operating Force: 157gf
• Termination Style: Through Hole
• Operating Temperature Range: - 40 C to + 80 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: B3DA0000A; SW1018

Dimensions
Unit: mm
Construction
Circular Contact
When Dome Arrays are attached to the PCB, any PCB dust or
foreign particles will tend to collect in the center of the key when it is
pressed. Therefore, poor contact occurs easily in Dome Arrays that
provide contact at the center point only.
The circular contact construction provides contact along the circumference
of a circle, thus preventing poor contact by avoiding the center point.
274
B3DA-0010-A
B3DA-0000-A
Conventional models
Contact at center point
Ultra-low Profile Dome Array
Separator (paper)
Separator
(paper)
B enlarged
B enlarged
foreign matter (circular contact)
Contact dome resistant to
Contact dome (4 dia.)
Thickness: 0.06
Sheet thickness (0.05)
Contact dome (5 dia.)
Thickness: 0.06
Sheet thickness (0.05)
Cover film
Cover film
Cylindrical protrusion
Contact along
circle circumference
(circular contact)
B3DA
A-A cross section
A-A cross section
Two, 2.1 dia.
Two, 2.1 dia.
Four, R5
Four, R5
Matrix Adhesive
The surface structure of this adhesive has grid-shaped slits, as
shown in the following cross-sectional diagram. These slits provide
both ventilation and dust-proofing, which is required for contact dome
operation.
15 µm
Cover film
Matrix adhesive
Contact dome
diameter
Operating
force (OF)
Plating
Contact dome
diameter
Operating
force (OF)
Plating
Slits
Stainless steel contact dome
(circular contact)
Separator
4 dia. (18 keys)
1.57 ± 0.49 N
Unplated
5 dia. (18 keys)
1.57 ± 0.49 N
Unplated
Cover film
Matrix (acrylic)
adhesive: 25 µm