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 Embossed taping (standard quantity) Embossed taping (small quantity) Without With ground Minimum Without With ground Minimum Operation Contact Operating Plunger Locating ground terminal packing ground terminal packing type material Height force (OF) color pin terminal unit terminal unit B3U-1000 Silver 1.6 mm 1.5 N Black Without B3U-1000P B3U-1100P 3,500 B3U-1000PM B3U-1100PM 1,000 Series: plated 153 gf boss Top- With B3U-1000P-B B3U-1100P-B B3U-1000PM-B B3U-1100PM-B actuated boss B3U-3000 3.2 mm 1.59 N Without B3U-3000P B3U-3100P 4,000 B3U-3000PM B3U-3100PM 1,000 Series: 162 gf boss Side- With B3U-3000P-B B3U-3100P-B B3U-3000PM-B B3U-3100PM-B actuated boss Note: Orders must be made in multiples of the order unit specified above. Ratings/Characteristics Operating Characteristics Operation Top-actuated Side-actuated Operation type Top-actuated Side-actuated Item type (B3U-1000 Series) (B3U-3000 Series) Item (B3U-1000 Series) (B3U-3000 Series) Rating 1 to 50 mA, 3 to 12 VDC Operating force (OF) 1.50 0.49 N 1.59 0.49 N (resistive load) 153 50 gf 162 50 gf Minimum applicable 10 A at 1 VDC (resistive load) Releasing force (RF) 0.2 N min. 20 gf load (reference value) +0.2 +0.2 Pretravel (PT) 0.15 mm 0.2 mm 0.1 0.1 Ambient operating -25C to +70C at 60%RH max. (with no icing or temperature condensation) Ambient operating 35% to 85% (at +5 to +35C) humidity Contact form SPST-NO Contact resistance 100 m max. (initial value) Insulation resistance 100 M min. (at 100 VDC with insulation tester) 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 2 Shock resistance 1,000 m/s max. Durability 200,000 operations 100,000 operations min. min. Weight Approx. 0.022 g Degree of protection IEC IP40 Washing Not possible 1B3U B3U Dimensions (Unit: mm) Top-actuated Models Without Ground Terminal, without Boss With Ground Terminal, without Boss B3U-1000P(M) Terminal Arrangement B3U-1100P(M) Terminal Arrangement /Internal Connections /Internal Connections (Top View) (Top View) 21 2 1 3 PCB Pad PCB Pad (Top View) (Top View) +0.15 +0.15 1.6 1.6 0.10 0.10 4 4 0.1 0.1 4.2 4.2 +0.15 +0.15 1.2 3 1.2 3 0.10 0.10 0.1 0.1 2.6 2.6 2.5 1.4 1.70.1 2.5 1.4 0.1 1.7 1.10.1 1.9 0.1 1.1 1.5 dia. 1.5 dia. 0.5 0.80.1 Without Ground Terminal, with Boss With Ground Terminal, with Boss Terminal Arrangement Terminal Arrangement B3U-1000P(M)-B B3U-1100P(M)-B /Internal Connections /Internal Connections (Top View) (Top View) 21 2 1 3 PCB Pad PCB Pad (Top View) (Top View) +0.15 +0.15 1.6 0.10 1.6 0.10 4 4 0.1 4.2 +0.15 4.20.1 +0.15 3 1.2 0.10 3 1.2 0.10 2.60.1 0.1 2.6 2.5 1.4 0.1 1.7 2.5 1.4 1.70.1 1.10.1 1.9 +0.1 Hole: 0.75 dia. 0.1 0 +0.1 1.1 Hole: 0.75 dia. 1.5 dia. 1.5 dia. 0 0.5 0.80.1 0.5 0.5 0.650.05 dia. 0.05 0.65 dia. Note: Unless otherwise specified, a tolerance of 0.2 mm applies to all dimensions. No terminal numbers are indicated on the Switches. 2
