OMRON B3U User Manual
Ultra-small-sized Tactile Switch with
High Contact Reliability:
1.2 × 3 × 2.5 mm (H × W × D)
■ Industry’s smallest switch* allows high-density
mounting on PCBs for mobile equipment.
*As of October 2006 (according to OMRON survey).
■ Dust-proof constr uction provi des high reli ability in
dusty environments.
■ Surface mounted: Ideal for high-density mounting.
■ Models with ground terminals are available for
protection against static electricity.
RoHS Compliant
(See page 3 for details.)
B3U Ultra-small Tactile Switch
Ordering Information
Packaging Embossed taping
Operation
type
Topactuated
Sideactuated
Order
unit
3,500
pieces
4,000
pieces
Ground
terminal
Without
boss
With boss B3U-1000P-B B3U-1100P-B
Without
boss
With boss B3U-3000P-B B3U-3100P-B
Without ground
terminal
B3U-1000P B3U-1100P
B3U-3000P B3U-3100P
With ground
terminal
Note: Orders must be made in multiples of the order unit speci-
fied above.
Operating Characteristics
Operation type Top-actuated
Item
Operating force (OF) 1.50
Releasing force (RF) 0.2 N min.
Pretravel (PT) 0.15 mm 0.2 mm
(B3U-1000 Series)
± 0.49 N 1.59 ± 0.49 N
+0.2
−0.1
Side-actuated
(B3U-3000 Series)
+0.2
−0.1
Specifications
■ Ratings/Characteristics
Operation
Item
Switching
capacity
Ambient oper ating
temperature
Ambient humidity 35% to 85% (at 5 to 35
Contact
configuration
Contact
resistance
Insulation
resistance
Dielectric strength 250 VAC, 50/60 Hz for 1 min
Bounce time 5 ms max.
Vibration
resistance
Shock resistance
Life expectancy 200,000 operations min. 100,000 operations min.
Maximum
operating force
Weight Approx. 0.022 g
type
Top-actuated
(B3U-1000 Series)
1 to 50 mA, 5 to 12 VDC (resistive load)
−25 to 70°C, 60% humidity (with no icing or conden-
sation)
SPST-NO
100 mΩ max. (initial value) (rated: 1 mA, 5 VDC)
Ω min. (at 100 VDC)
100 M
10 to 55 Hz, 1.5 mm double amplitude
2
1,000 m/s
30 N max.
max.
Side-actuated
(B3U-3000 Series)
°C)
Dimensions
Note: All dimensions are in millimeters unless otherwise indicated. Unless otherwise specified, a tolerance of ±0.2 mm applies to all di-
mensions.
■
Top-actuated Models
Without Ground Terminal, without Boss With Ground Terminal, without Boss
B3U-1000P
2.5 1.4
PCB Mounting
1.7±
0.1
(Top View)
0.1
4.2±
0.1
2.6±
+0.15
1.6
4
3
1.5 dia.
−0.10
+0.15
1.2
−0.10
B3U-1100P
2.5 1.4
1.5 dia.
+0.15
1.6
4
3
0.5
−0.10
+0.15
1.2
−0.10
1.7±
1.9
PCB Mounting
(Top View)
0.1
4.2±
0.1
2.6±
0.1
0.1
0.8±
1.1±
1.1±
0.1
0.1
1
Without Ground Terminal, with Boss With Ground Terminal, with Boss
B3U-1000P-B
B3U-1100P-B
B3UB3U
PCB Mounting
2.5 1.4
0.65±
4
3
0.05 dia.
1.5 dia.
+0.15
1.6
−0.10
+0.15
1.2
−0.10
0.5
1.7±
(Top View)
0.1
0.1
4.2±
0.1
2.6±
Hole: 0.75
+0.15
1.6
4
3
2.5 1.4
+0.1
dia.
0
1.5 dia.
0.5
−0.10
+0.15
1.2
−0.10
1.7±
1.9
Hole: 0.75
0.5
0.05
dia.
0.65±
■ Side-actuated Models
Note: Unless otherwise specified, a tolerance of ±0.2 mm applies to all dimensions.
Without Ground Terminal, without Boss With Ground Terminal, without Boss
B3U-3000P
3.2
2.5 1.4
±0.1
1
±0.1
1.7
PCB Mounting
(Top View)
±0.1
4.2
±0.1
2.6
4
3
1.7
+0.15
1.2
−0.10
0.9
1.95
B3U-3100P
3.2
2.5 1.4
4
3
1.7
0.9
+0.15
1.2
−0.10
0.1
±
1
1.95
±0.1
1.7
1.9
0.5
PCB Mounting
(Top View)
0.1
4.2±
0.1
2.6±
0.1
+0.1
dia.
0
0.1
0.8±
PCB Mounting
(Top View)
0.1
±
4.2
0.1
±
2.6
±0.1
0.8
1.1±
1.1±
1.1
1.1
0.1
0.1
±0.1
±0.1
Without Ground Terminal, with Boss With Ground Terminal, with Boss
B3U-3000P-B
3.2
2.5 1.4
0.65
4
3
1.7
0.9
±
0.05 dia.
1.95
+0.15
1.2
−0.10
PCB Mounting
±0.1
1
±0.1
1.7
(Top View)
±0.1
4.2
±0.1
2.6
Hole: 0.75
+0.1
0.5
dia.
0
B3U-3100P-B
3.2
2.5 1.4
0.65
4
3
1.7
0.9
±
0.05 dia.
+0.15
1.2
−0.10
±
0.1
1
1.95
1.7
1.9
Hole: 0.75
0.5
0.5
PCB Mounting
(Top View)
±
0.1
4.2
±
0.1
2.6
±
0.1
+0.1
dia.
0
±
0.1
0.8
±
0.1
1.1
±
0.1
1.1
2
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