Ultra-small Tactile Switch (SMT)
B3U
Ultra-small Surface-mounting Tactile
Switches with High Contact Reliability
(1.2 × 3 × 2.5 mm (H × W × D)
• Smallest class in the industry for high-density
mounting of compact devices.
• Surface mounted: Ideal for high-density mounting.
• Models with ground terminals are available for
protection against static electricity.
• Available on embossed tape: Ideal for automatic
mounting.
RoHS Compliant
■
List of Models
6 × 6 mm Models
Embossed taping (standard quantity)
Operation
type
Contact
material Height
B3U-1000
Series:
Topactuated
Silver
plated
■
1.6 mm 1.5 N
{153 gf}
Black
Locating
pin
With ground
terminal
Minimum
packing
unit
3,500
Without
boss
B3U-1100P
B3U-1000P-B
B3U-1100P-B
Without
boss
B3U-3000P
B3U-3100P
With
boss
3.2 mm 1.59 N
{162 gf}
B3U-1000P
With
boss
B3U-3000
Series:
Sideactuated
Note:
Operating Plunger
force (OF) color
Without
ground
terminal
B3U-3000P-B
B3U-3100P-B
Embossed taping (small quantity)
Without
ground
terminal
B3U-1000PM
With ground
terminal
B3U-1100PM
Minimum
packing
unit
1,000
B3U-1000PM-B B3U-1100PM-B
4,000
B3U-3000PM
B3U-3100PM
1,000
B3U-3000PM-B B3U-3100PM-B
Orders must be made in multiples of the order unit specified above.
Ratings/Characteristics
Item
Operation
type
■
Top-actuated
(B3U-1000 Series)
Side-actuated
(B3U-3000 Series)
Operating Characteristics
Operation type
Item
Top-actuated
(B3U-1000 Series)
Rating
(resistive load)
1 to 50 mA, 3 to 12 VDC
Operating force (OF)
1.50 ± 0.49 N
{153 ± 50 gf}
Minimum applicable
load (reference value)
10 μA at 1 VDC (resistive load)
Releasing force (RF)
0.2 N min. {20 gf}
Ambient operating
temperature
-25°C to +70°C at 60%RH max. (with no icing or
condensation)
Pretravel (PT)
0.15 +0.2 mm
−0.1
Ambient operating
humidity
35% to 85% (at +5 to +35°C)
Contact form
SPST-NO
Contact resistance
(initial value)
Side-actuated
(B3U-3000 Series)
100 mΩ max.
Insulation resistance
250 VAC, 50/60 Hz for 1 min
Bounce time
5 ms max.
Vibration resistance
0.2 +0.2 mm
−0.1
100 MΩ min. (at 100 VDC with insulation tester)
Dielectric strength
1.59 ± 0.49 N
{162 ± 50 gf}
10 to 55 Hz, 1.5 mm double amplitude
Shock resistance
1,000 m/s2 max.
Durability
200,000 operations
min.
Weight
Approx. 0.022 g
Degree of protection
IEC IP40
Washing
Not possible
100,000 operations
min.
1
