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B3U Ultra-small Tactile Switch (SMT)

Ultra-small-sized Tactile Switch with High Contact Reliability:
1.2 × 3 × 2.5 mm (H × W × D)

  • Compact switch allows high-density mounting on PCBs for mobile equipment.
  • Dust-proof construction provides high reliability in dusty environments.
  • Surface mounted: Ideal for high-density mounting.
  • Models with ground terminals are available for protection against static electricity.
This web page provides an excerpt from a datasheet.
Refer to Datasheet and other applicable documents for more information.
OrderingInformationRatings / CharacteristicsDimensions
Operation
type		 Locating pin Plunger
color		 Embossed taping
(standard quantity)		 Embossed taping
(small quantity)
Without
ground
terminal		 With ground
terminal		 Quantity per
reel		 Without
ground
terminal		 With ground
terminal		 Quantity
Top-actuated Without
boss		 Black B3U-1000P B3U-1100P 3,500 B3U-1000PM B3U-1100PM 1,000
With boss B3U-1000P-B B3U-1100P-B B3U-1000PM-B B3U-1100PM-B
Side-actuated Without
boss		 B3U-3000P B3U-3100P 4,000 B3U-3000PM B3U-3100PM 1,000
With boss B3U-3000P-B B3U-3100P-B B3U-3000PM-B B3U-3100PM-B
Note: Orders must be made in multiples of the order unit specified above.
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OrderingInformationRatings / CharacteristicsDimensions
Item Operation
type
Top-actuated
(B3U-1000 Series)		 Side-actuated
(B3U-3000 Series)
Switching capacity 1 to 50 mA, 5 to 12 VDC (resistive load)
Ambient operating temperature -25°C to +70°C at 60%RH max. (with no icing or condensation)
Ambient humidity 35% to 85% (at 5 to 35ºC)
Contact configuration SPST-NO
Contact resistance 100 mΩ max. (initial value) (rated: 1 mA, 5 VDC)
Insulation resistance 100 MΩ min. (at 100 VDC)
Dielectric strength 250 VAC, 50/60 Hz for 1 min
Bounce time 5 ms max.
Vibration resistance 10 to 55 Hz, 1.5 mm double amplitude
Shock resistance 1,000 m/s2 max.
Durability 200,000 operations min. 100,000 operations min.
Maximum operating force 30 N max.
Weight Approx. 0.022 g
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OrderingInformationRatings / CharacteristicsDimensions
Note: All dimensions are in millimeters unless otherwise indicated. Unless otherwise specified, a tolerance of ±0.2 mm applies to all dimensions.
Top-actuated Models
Without Ground Terminal, without Boss
B3U-1000P(M)
B3U:Dimensions1
 
With Ground Terminal, without Boss
B3U-1100P(M)
B3U:Dimensions2
 
Without Ground Terminal, with Boss
B3U-1000P(M)-B
B3FS:Dimensions3
 
With Ground Terminal, with Boss
B3U-1100P(M)-B
B3U:Dimensions2
Side-actuated Models
Note: Unless otherwise specified, a tolerance of ±0.2 mm applies to all dimensions.
Without Ground Terminal, without Boss
B3U-3000P(M)
B3FS:Dimensions3
 
With Ground Terminal, without Boss
B3U-3100P(M)
B3FS:Dimensions3
 
Without Ground Terminal, with Boss
B3U-3000P(M)-B
B3FS:Dimensions3
 
With Ground Terminal, with Boss
B3U-3100P(M)-B
B3FS:Dimensions3
Operating Characteristics
Operation type
Item
Top-actuated
(B3U-1000 Series)		 Side-actuated
(B3U-3000 Series)
Operating force (OF) 1.50 ± 0.49 N
{153 ± 50 gf}		 1.59 ± 0.49 N
{162 ± 50 gf}
Releasing force (RF) 0.2 N min. {20 gf}
Pretravel (PT)
0.15 +0.2 mm
-0.1
0.2 +0.2 mm
-0.1
 
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