B3D-5112 Omron, B3D-5112 Datasheet - Page 2

• Manufacturer Part Number: B3D-5112
• Description: 5MM DOME
• Manufacturer: Omron
• Series: B3Dr
• Type: Tactile Switchesr

Specifications of B3D-5112

• 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: 167gf
• Contact Form: SPST - NO
• Termination Style: Through Hole
• Operating Temperature Range: - 40 C to + 80 C
• Contact Voltage Dc Nom: 12V
• Contact Current Max: 10mA
• Actuation Type: Top
• Switch Terminals: PCB / Push-on
• Operating Force Min: 1.18N
• Operating Force Max: 2.16N
• Rohs Compliant: Yes
• Actuator / Cap Color: White
• Actuator Style: Dome
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: B3D5112; SW979

B3D
Structure
Matrix Adhesive
The surface structure of this adhesive has grid-shaped slits, as
shown in the following cross-sectional diagram. These slits pro-
vide both ventilation and dust-proofing, which is required for con-
tact dome operation.
Recommended Contact Form
4-mm Diameter Contact Dome (B3D-4112)
Recommended Operating Part Form
4-mm Diameter Contact Dome (B3D-4112)
2
Polyurethane
rubber film (with adhesive)
15 µm
Single-side PCB
Multilayer PCB
PET film (white)
(with matrix adhesive)
Entire
circumference: R 0.2
2.8 dia.
2.8 dia.
1.8 dia.
1.8 dia.
5.2 dia.
5.2 dia.
1 dia.
Slits
Gold-plated nickel
Gold-plated nickel
Resin
Resist (30 to 50 µm)
Cover film
Matrix (acrylic)
adhesive: 25 µm
0.4
1.2
Stainless steel
contact dome
(circular contact)
2.0
Single-side PCB
Multilayer PCB
Circular Contact
When contact dome keys 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 keys
that provide contact at the center point only.
The circular contact construction provides contact along the cir-
cumference of a circle, thus preventing poor contact by avoiding
the center point.
5-mm Diameter Contact Dome (B3D-5112)
5-mm Diameter Contact Dome (B3D-5112)
Conventional models
Contact at center point
Entire
circumference: R 0.2
3.8 dia.
3.8 dia.
2.3 dia.
2.3 dia.
6.2 dia.
6.2 dia.
1.5 dia.
Gold-plated nickel
Gold-plated nickel
foreign matter (circular contact)
Contact dome resistant to
Resist (30 to 50 µm)
Cylindrical protrusion
Contact along
circle circumference
(circular contact)
0.4
Resin
1.2
2.0
B3D