Mechanical Key Switch (SMD) B3S Surface-mounted Device (SMD) Design Meets High-density Mounting Requirements The whole switch body can be washed after soldering due to its sealing property. Sealed construction provides high reliability in dusty environments. Available with ground terminal for protection against static electricity. Positive tactile feedback. Fully sealed. Ordering Information 6 6-mm-type B3S-1000 Series Without ground terminal Operating p g force (OF) ( ) Bags With ground terminal Embossed tape (see note) Bags Embossed tape (see note) General-purpose 1.57 N (160 gf) B3S-1000 B3S-1000P B3S-1100 B3S-1100P High-force 2.25 N (230 gf) B3S-1002 B3S-1002P B3S-1102 B3S-1102P Note: Switches on embossed tape must be ordered in units of 1,000. Specifications Ratings/Characteristics Switching capacity 5 to 24 VDC, 1 to 30 mA (resistive load) Insulation voltage 30 VDC Contact configuration SPST-NO Contact resistance 100 mΩ max. (initial value) (Rated 5 VDC, 1 mA) Insulation resistance 100 MΩ min. (at 250 VDC) Dielectric strength 500 VAC, 50/60 Hz for 1 min Bounce time 5 ms max. Vibration resistance Malfunction: 10 to 55 Hz, 1.5-mm double amplitude Shock resistance Destruction: 1,000 m/s2 min. (approx. 100G min.) Malfunction: 100 m/s2 min. (approx. 10G min.) Life expectancy General-purpose models: High-force models: Ambient temperature Operating: –25°C to 70°C (with no icing) Ambient humidity Operating: 35% to 85% Weight Approx. 0.30 g 500,000 operations min. 300,000 operations min. 1 B3S B3S Operating Characteristics B3S-1000 Series Item General-purpose models High-force models Operating force (OF max.) 1.57 N (160 gf) max. 2.25 N (230 gf) max. Reset force (RF min.) 0.2 N (20 gf) min. 0.49 N (50 gf) min. Pretravel (PT) 2 0.25 +0.2/ –0.1 mm B3S B3S Engineering Data Operating force (gf) Operating Force vs. Stroke (Typical) High-force models General-purpose models Stroke S (mm) Nomenclature Plunger Cover Spacer Sealing rubber Moving contact (disk spring) Base Fixed contact 3 B3S B3S Dimensions Note: All units are in millimeters unless otherwise indicated. Without Ground Terminal B3S-1000 B3S-1002 PCB Mounting (Top View) Terminal Arrangement /Internal Connections (Top View) PCB Mounting (Top View) Terminal Arrangement /Internal Connections (Top View) 3.3 dia. With Ground Terminal B3S-1100 B3S-1102 3.3 dia. Precautions Reflow Soldering Attach a thermocouple to one side of the terminal with high-temperature solder and use the thermocouple to set the reflow oven to a peak terminal temperature of 230°±5°C. The optimum heating curve is shown below. Temperature % ( C) 10 s max. 1 to 4°C/s 1 to 5°C/s Normal temperature 60 to 90 s 20 s 30 s max. Time (s) Note: 4 The above heating curve applies if the thickness of the circuit board is 1.6 mm. Do not apply additional force to the plunger once it has stopped moving. Do not repeatedly press the plunger off-center or from an acute angle. B3S Switches are designed to allow submersed washing after soldering. When washing, follow the guidelines given below: 1. Clean with alcohol solvents. Do not use chlorine solvents or water. 2. When using ultrasonic cleaning in two- or three-tank systems and do not clean for more than one minute at a time or for more than three minutes total. 3. Do not apply external force to the Switch while washing. 4. Do not wash immediately after soldering. If possible, allow components to stand for at least three minutes before washing. 5. The Switch cannot be used where subject to direct contact with water. B3S B3S Key Switch Packing Key Switches are packed on tape as shown below. Top tape Material: PET 21.5 330 dia. 13 dia. Carrier tape (Material: PS+butadiene) Tape reel Label 2 16 8.7 7 7.5 Pitch: 4±0.1 1.75 Pitch: 12±0.1 1.5 dia.+0.1/0 1.5 Tape drawing direction 4.7 0.4 0.06 9.4 Standard Conforms to EIAJ standards Package 1,000 Key Switches Heat resistance 60°C for 24 hours (without deformation) Note: The ground terminals of the Key Switches are on the guidehole side of the package. ALL DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527. Cat. No. C108-E1-1 In the interest of product improvement, specifications are subject to change without notice. OMRON Corporation Control Components Division H.Q. 28th Fl., Crystal Tower Bldg. 1-2-27, Shiromi, Chuo-ku, Osaka 540 Japan Phone: 06-949-6115 Fax: 06-949-6134 Printed in Japan 0697-1M (0697) a 5