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)
Embossed taping (small quantity)
Without
ground
terminal
With ground Minimum
Without
ground
terminal
With ground Minimum
Operation Contact
Operating Plunger Locating
terminal
packing
unit
terminal
packing
unit
type
material Height force (OF) color pin
B3U-1000 Silver
1.6 mm 1.5 N
{153 gf}
Black
Without B3U-1000P
B3U-1100P
3,500
4,000
B3U-1000PM
B3U-1100PM
1,000
1,000
Series:
plated
boss
Top-
actuated
With
boss
B3U-1000P-B B3U-1100P-B
B3U-1000PM-B B3U-1100PM-B
B3U-3000PM B3U-3100PM
B3U-3000PM-B B3U-3100PM-B
B3U-3000
Series:
Side-
actuated
3.2 mm 1.59 N
{162 gf}
Without B3U-3000P
boss
B3U-3100P
With
boss
B3U-3000P-B B3U-3100P-B
Note: Orders must be made in multiples of the order unit specified above.
■ Ratings/Characteristics
■ Operating Characteristics
Operation
type
Top-actuated
(B3U-1000 Series)
Side-actuated
(B3U-3000 Series)
Operation type
Top-actuated
(B3U-1000 Series)
Side-actuated
(B3U-3000 Series)
Item
Item
Rating
(resistive load)
1 to 50 mA, 3 to 12 VDC
Operating force (OF)
1.50 ± 0.49 N
{153 ± ±50 gf}
1.59 ± 0.49 N
{162 ± ±50 gf}
Minimum applicable
load (reference value)
10 μA at 1 VDC (resistive load)
Releasing force (RF)
Pretravel (PT)
0.2 N min. {20 gf}
+0.2
+0.2
0.15
mm
0.2
mm
−0.1
−0.1
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
(initial value)
100 mΩ max.
Insulation resistance
Dielectric strength
Bounce time
100 MΩ min. (at 100 VDC with insulation tester)
250 VAC, 50/60 Hz for 1 min
5 ms max.
Vibration resistance
Shock resistance
Durability
10 to 55 Hz, 1.5 mm double amplitude
2
1,000 m/s max.
200,000 operations
min.
100,000 operations
min.
Weight
Approx. 0.022 g
IEC IP40
Degree of protection
Washing
Not possible
1