Sealed Tactile Switch (SMT)
Compact Surface Mount Tactile Switch
with Sealed Construction
• Sealed construction conforming to IP67 (IEC-
60529) provides high reliability in locations
exposed to dust or water. (* Excluding the termi
nal section.)
• Available with ground terminals for protection
against static electricity.
• Use of a stainless-steel spring provides a crisp
clicking action.
• Gold plated version enables stable contact and
insulation over long periods of time.
• Available in embossed taping packages for automatic mounting.
RoHS Compliant
■ List of Models
-
B3SN
Typ e Plunger color Bags (in units of 100 Switches) Embossed taping
Standard, without ground terminal Ivory B3SN-3012 B3SN-3012P
Standard, with ground terminal Ivory B3SN-3112 B3SN-3112P
Gold-plated, without ground terminal Black --- B3SN-3012P-G
Note: Switches in bags must be ordered in units of 100 pieces, and Switches on embossed taping must be ordered in units of 3,000 piec-
es. Individual Switches are not sold individually.
■ Ratings/Characteristics
Ratings 1 to 50 mA, 5 to 24 VDC (resistive load)
Ambient operating temperature -25°C to +70°C at 60%RH max. (with no icing or condensation)
Ambient operating humidity 35% to 85% (at +5 to +35°C)
Contact form SPST-NO
Contact resistance 100 mΩ max. (initial value) (rated: 1 mA, 5 VDC)
Insulation resistance 100 MΩ min. (at 250 VDC)
Dielectric strength 250 VAC, 50/60 Hz for 1 min
Bounce time 5 ms max.
Vibration resistance Malfunction: 10 to 55 Hz, 1.5-mm double amplitude
Shock resistance
Durabulity 100,000 operations min.
Weight Approx. 0.2 g
■ Operating Characteristics
Item Type Standard Gold-plated (B3SN-G)
Operating force (OF) 1.57±0.49 N {160±50 gf} max. 1.76±0.59 N {180±60 gf} max.
Releasing force (RF) 0.29 N {30 gf} min.
Pretravel (PT) 0.25±0.15 mm
Destruction: 1,000 m/s2 {approx. 100G} max.
(in units of 3,000 Switches)
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■ Model Structure
Film
Pushbutton
Cover
Terminals
Plunger
Contact dome
Fixed contact
Base
(Bottom View)
2
4
1
3
Without Ground Terminal
B3SN-3012
B3SN-3012P
B3SN-3012-G
With Ground Terminal
B3SN-3112
B3SN-3112P
PCB Pad
(Top View)
Terminal Arrangement
/Internal Connections
(Top View)
PCB Pad
(Top View)
Terminal Arrangement
/Internal Connections
(Top View)
4±0.2
3 dia.
2
6
7
±0.5
4
9.5
(4.6)
6.5
0.7
0.11.2
6
3.1
+0.3
0
2.6 5.4
4
2
3
1
4
±0.2
3.4±0.2
3 dia.
2
7
±0.5
4
9.5
(4.6)
6.5
0.70.7
0.11.2
6
3.1
+0.3
0
2.61.4 5.4
4
2
3
5
1
6
■ Dimensions
Note: The numbers used for terminals in the following graphics are indicated in the “Bottom View” diagram below. In this
diagram, the Switch is rotated so that the terminals are on the right and left-hand sides, and the OMRON logo appears
the right way up.
B3SNB3SN
Note: Unless otherwise specified, a tolerance of ±0.4 mm applies to all dimensions. No terminal numbers are indicated on the Switches.
■ Precautions
Be sure to read the safety precautions common to all Tactile Switches on pages for correct use.
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