Ultra-small Tactile Switch (SMT) B3U Ultra-small Surface-mounting Tactile Switches with High Contact Reliability (1.2 x 3 x 2.5 mm (H x W x 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) Operation type Contact material Height B3U-1000 Series: Topactuated Silver plated B3U-3000 Series: Sideactuated Note: Operating Plunger force (OF) color 1.6 mm 1.5 N {153 gf} Black 3.2 mm 1.59 N {162 gf} Locating pin Without ground terminal With ground terminal Minimum packing unit 3,500 Without boss B3U-1000P B3U-1100P With boss B3U-1000P-B B3U-1100P-B Without boss B3U-3000P B3U-3100P With boss 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 A at 1 VDC (resistive load) Releasing force (RF) 0.2 N min. {20 gf} Ambient operating temperature -25C to +70C at 60%RH max. (with no icing or condensation) Pretravel (PT) 0.15 +0.2 -0.1 mm Ambient operating humidity 35% to 85% (at +5 to +35C) Contact form SPST-NO Contact resistance (initial value) 100 m max. 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 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 Side-actuated (B3U-3000 Series) 1.59 0.49 N {162 50 gf} 0.2 +0.2 -0.1 mm 100,000 operations min. 1 B3U B3U Dimensions (Unit: mm) Top-actuated Models Without Ground Terminal, without Boss With Ground Terminal, without Boss Terminal Arrangement /Internal Connections (Top View) B3U-1000P(M) 2 Terminal Arrangement /Internal Connections (Top View) B3U-1100P(M) 2 1 1 3 1.6 PCB Pad (Top View) +0.15 -0.10 4 3 2.5 1.4 1.6 4 3 4.20.1 2.60.1 1.2 +0.15 -0.10 2.5 1.70.1 PCB Pad (Top View) +0.15 -0.10 4.20.1 2.60.1 1.2 +0.15 -0.10 1.4 1.70.1 1.10.1 1.9 1.10.1 1.5 dia. 1.5 dia. 0.5 0.80.1 Without Ground Terminal, with Boss With Ground Terminal, with Boss Terminal Arrangement /Internal Connections (Top View) B3U-1000P(M)-B 2 Terminal Arrangement /Internal Connections (Top View) B3U-1100P(M)-B 2 1 1 3 1.6 4 3 2.5 PCB Pad (Top View) +0.15 -0.10 1.6 1.2 +0.15 -0.10 1.4 4 3 4.20.1 2.60.1 1.70.1 2.5 4.20.1 2.60.1 1.2 +0.15 -0.10 1.4 1.70.1 1.10.1 1.9 Hole: 0.75 +0.1 0 dia. 1.5 dia. PCB Pad (Top View) +0.15 -0.10 Hole: 1.5 dia. 0.75 +0.1 0 dia. 1.10.1 0.5 0.80.1 0.5 0.650.05 dia. Note: 2 0.5 0.650.05 dia. Unless otherwise specified, a tolerance of 0.2 mm applies to all dimensions. No terminal numbers are indicated on the Switches. B3U B3U Side-actuated Models Without Ground Terminal, without Boss With Ground Terminal, without Boss Terminal Arrangement /Internal Connections (Top View) B3U-3000P(M) 2 B3U-3100P(M) Terminal Arrangement /Internal Connections (Top View) 2 1 1 3 4 3 PCB Pad (Top View) 1.2+0.15 -0.10 1.7 10.1 0.9 4 3 1.7 0.9 4.20.1 2.60.1 10.1 2.5 4.20.1 2.60.1 1.95 1.95 3.2 PCB Pad (Top View) 1.2+0.15 -0.10 3.2 1.70.1 1.4 2.5 1.70.1 1.4 1.10.1 1.9 1.10.1 0.5 0.80.1 Without Ground Terminal, with Boss B3U-3000P(M)-B With Ground Terminal, with Boss Terminal Arrangement /Internal Connections (Top View) 2 Terminal Arrangement /Internal Connections (Top View) B3U-3100P(M)-B 2 1 1 3 4 3 PCB Pad (Top View) 1.2+0.15 -0.10 1.7 10.1 0.9 4.20.1 2.60.1 1.95 3.2 2.5 4.20.1 2.60.1 1.95 3.2 1.70.1 1.4 PCB Pad (Top View) 1.2+0.15 -0.10 1.7 10.1 0.9 4 3 2.5 1.70.1 1.4 1.10.1 1.9 Hole: 0.75 +0.1 0 dia. Hole: 0.75 +0.1 0 dia. 1.10.1 0.5 0.80.1 0.5 0.650.05 dia. Note: 0.5 0.650.05 dia. 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. 3 B3U B3U Please check each region's Terms & Conditions by region website. OMRON Corporation Electronic and Mechanical Components Company Regional Contact Americas https://www.components.omron.com/ Asia-Pacific https://ecb.omron.com.sg/ Korea https://www.omron-ecb.co.kr/ Europe http://components.omron.eu/ China https://www.ecb.omron.com.cn/ Japan https://www.omron.co.jp/ecb/ (c) OMRON Corporation 2007-2018 All Rights Reserved. In the interest of product improvement, specifications are subject to change without notice. Cat. No. A162-E1-07 0318(0207)(O)