1
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.
■List of Models
Note: Orders must be made in multiples of the order unit specified above.
■Ratings/Characteristics ■Operating Characteristics
RoHS Compliant
Embossed taping (standard quantity) Embossed taping (small quantity)
Operation
type Locating pin
Plunger
color
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
Item
Operation
type
Top-actuated
(B3U-1000 Series)
Side-actuated
(B3U-3000 Series)
Ratings 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 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 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
Item
Operation type 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 mm 0.2 mm
+0.2
−0.1
+0.2
−0.1
2
B3UB3U
■Dimensions (Unit: mm)
Top-actuated Models
Note: Unless otherwise specified, a tolerance of ±0.2 mm applies to all dimensions. No terminal numbers are indicated on the Switches.
Without Ground Terminal, without Boss With Ground Terminal, without Boss
Without Ground Terminal, with Boss With Ground Terminal, with Boss
3
4
2.5 1.4
2.6±
0.1
1.7±
0.1
4.2±
0.1
1.5 dia.
1.6
+0.15
−0.10
1.2
+0.15
−0.10
PCB Mounting
(Top View)
B3U-1000P(M)
21
Terminal Arrangement
/Internal Connections
(Top View)
1.9
0.5
3
4
2.5 1.4
0.8±0.1
1.1±0.1
1.1±0.1
2.6±0.1
1.7±0.1
4.2±0.1
1.5 dia.
1.6 +0.15
−0.10
1.2 +0.15
−0.10
B3U-1100P(M)
PCB Mounting
(Top View)
Terminal Arrangement
/Internal Connections
(Top View)
0.65±0.05 dia.
0.5
3
4
2.5 1.4
2.6±0.1
1.7±0.1
4.2±0.1
1.5 dia.
Hole: 0.75 +0.1
0dia.
1.6 +0.15
−0.10
1.2 +0.15
−0.10
B3U-1000P(M)-B
PCB Mounting
(Top View)
Terminal Arrangement
/Internal Connections
(Top View)
21
1.6
+0.15
−0.10
1.2
+0.15
−0.10
0.65±
0.05
dia.
0.5
1.9
0.5
3
4
2.5 1.4
0.8±
0.1
1.1±
0.1
1.1±
0.1
2.6±
0.1
1.7±
0.1
4.2±
0.1
1.5 dia. Hole: 0.75 +0.1
0dia.
B3U-1100P(M)-B
PCB Mounting
(Top View)
Terminal Arrangement
/Internal Connections
(Top View)
3
B3UB3U
Side-actuated Models
Note: Unless otherwise specified, a tolerance of ±0.2 mm applies to all dimensions. No terminal numbers are indicated on the Switches.
■Precautions
Be sure to read the precautions common to all Tactile Switches on pages for correct use.
Without Ground Terminal, without Boss With Ground Terminal, without Boss
Without Ground Terminal, with Boss With Ground Terminal, with Boss
1.95
1.7
0.9
3
3.2
4
2.5 1.4
2.6±0.1
1.7±0.1
4.2±0.1
1.2+0.15
−0.10
1±0.1
B3U-3000P(M)
PCB Mounting
(Top View)
Terminal Arrangement
/Internal Connections
(Top View)
21
1.9
1.95
1.7
3
3.2
4
2.5 1.4
0.5
0.8
±0.1
1.1
±0.1
1.1
±0.1
2.6
±0.1
1.7
±0.1
4.2
±0.1
0.9
1.2
+0.15
−0.10
1
±0.1
B3U-3100P(M)
PCB Mounting
(Top View)
Terminal Arrangement
/Internal Connections
(Top View)
2
3
1
2.6
±0.1
1.7
±0.1
4.2
±0.1
1.95
3
3.2
4
2.5 1.4
0.5
1.2
+0.15
−0.10
1
±0.1
1.7
0.9
Hole: 0.75 +0.1
0dia.
0.65±
0.05
dia.
PCB Mounting
(Top View)
B3U-3000P(M)-B Terminal Arrangement
/Internal Connections
(Top View)
21
1.9
1.95
3
3.2
4
2.5 1.4
0.5
0.5
0.8
±0.1
1.1
±0.1
1.1
±0.1
2.6
±0.1
1.7
±0.1
4.2
±0.1
1.7
0.9
1.2
+0.15
−0.10
1
±0.1
Hole: 0.75 +0.1
0dia.
0.65±
0.05
dia.
B3U-3100P(M)-B
PCB Mounting
(Top View)
Terminal Arrangement
/Internal Connections
(Top View)
2
3
1
B3UB3U
• Application examples provided in this document are for reference only. In actual applications, confirm equipment functions and safety before using the product.
• Consult your OMRON representative before using the product under conditions which are not described in the manual or applying the product to nuclear control systems, railroad
systems, aviation systems, vehicles, combustion systems, medical equipment, amusement machines, safety equipment, and other systems or equipment that may have a serious
influence on lives and property if used improperly. Make sure that the ratings and performance characteristics of the product provide a margin of safety for the system or
equipment, and be sure to provide the system or equipment with double safety mechanisms.
OMRON Corporation
ELECTRONIC AND MECHANICAL COMPONENTS COMPANY Contact: www.omron.com/ecb Cat. No. A162-E1-05
0812(0207)(O)
Note: Do not use this document to operate the Unit.