1 b3u ultra-small tactile switch ultra-small-sized tactile switch with high contact reliability: 1.2 3 2.5 mm (h w d) industry?s smallest switch* allows high-density mounting on pcbs for mobile equipment. *as of october 2006 (according to omron survey). 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. ordering information note: orders must be made in multiples of the order unit speci- fied above. operating characteristics specifications ratings/characteristics dimensions note: all dimensions are in millimeters unless ot herwise indicated. unless otherwise specified, a tolerance of 0.2 mm applies to all di- mensions. top-actuated models rohs compliant operation type order unit packaging embossed taping ground terminal without ground terminal with ground terminal top- actuated 3,500 pieces without boss b3u-1000p b3u-1100p with boss b3u-1000p-b b3u-1100p-b side- actuated 4,000 pieces without boss b3u-3000p b3u-3100p with boss B3U-3000P-B b3u-3100p-b item operation type top-actuated (b3u-1000 series) side-actuated (b3u-3000 series) operating force (of) 1.50 0.49 n 1.59 0.49 n releasing force (rf) 0.2 n min. pretravel (pt) 0.15 mm 0.2 mm + 0.2 ? 0.1 + 0.2 ? 0.1 item operation type top-actuated (b3u-1000 series) side-actuated (b3u-3000 series) switching capacity 1 to 50 ma, 5 to 12 vdc (resistive load) ambient operating temperature ? 25 to 70 c, 60% humidity (with no icing or conden- sation) ambient humidity 35% to 85% (at 5 to 35 c) contact configuration spst-no contact resistance 100 m ? max. (initial value) (rated: 1 ma, 5 vdc) insulation resistance 100 m ? 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/s 2 max. life expectancy 200,000 operations min. 100,000 operations min. maximum operating force 30 n max. weight approx. 0.022 g without ground terminal, without boss with ground terminal, without 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 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 pcb mounting (top view)
2 b3u b3u side-actuated models note: unless otherwise specified, a tolerance of 0.2 mm applies to all dimensions. without ground terminal, with boss with ground terminal, with boss without ground terminal, without boss with ground terminal, without boss without ground terminal, with boss with ground terminal, with boss 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 0 dia. 1.6 + 0.15 ? 0.10 1.2 + 0.15 ? 0.10 b3u-1000p-b pcb mounting (top view) 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 0 dia. b3u-1100p-b pcb mounting (top view) 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 pcb mounting (top view) 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 pcb mounting (top view) 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 0.65 0.05 dia. hole: 0.75 +0.1 0 dia. pcb mounting (top view) B3U-3000P-B 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 0.65 0.05 dia. hole: 0.75 +0.1 0 dia. b3u-3100p-b pcb mounting (top view)
3 b3u b3u precautions note: refer to safety precautions in the tactile switches (cat. no. x037) for details on general safety precautions. precautions for correct use soldering perform reflow soldering within the ranges shown in the terminal temperature profile in the following diagram. washing b3u switches cannot be washed. doing so will cause the wash- ing agent, together with flux or dust particles on the pcb, to enter the switch, resulting in malfunction. compliance with rohs directive the ?rohs compliant? designation indicates that the product does not contain the following si x hazardous substances covered by the rohs directive. reference: the following standards are used to determine com- pliance for the six substances. lead: 1,000 ppm max. mercury: 1,000 ppm max. cadmium: 100 ppm max. hexavalent chromium: 1,000 ppm max. pbb: 1,000 ppm max. pbde: 1,000 ppm max. storage and operating environment do not store the product under the following conditions to prevent discoloration and other deterioration of the terminals. 1. locations subject to high temperatures or humidity 2. locations containing corrosive gases 3. locations subject to direct sunlight the switch is not provided with a watertight or drip-proof con- struction. do not install or operate the product in locations subject to water spray or splashes. packaging specifications the specifications for b3u s witches packaged on embossed tape are as follows: b3u-1000 series b3u-3000 series operation do not repeatedly operate the switch with excessive force. apply- ing excessive pressure or applying additional force after the plunger has stopped may deform the disc spring of the switch, resulting in malfunction. be sure to set up the switch so that the plunger will be pressed straight in. the life of the switch may be reduced if the plunger is pressed off-center or from an angle. do not apply pressure from above or below the plunger. doing so may deform or damage parts or cause faulty operation. do not operate the plunger from the side. doing so may deform or damage the switch. temperature ( c) 180 220 260 max. 150 preheating time heating time time (s) 60 to 120 60 max. standards conforms to jeita. package 3,500 switches (b3u-1000 series) 4,000 switches (b3u-3000 series) heat resistance 50 c for 24 hours (without deformation) 330 2 dia. 13 dia. reel label tape drawing direction (19) 12 0.3 5.5 1.75 0.1 8+ 0.1 4+ 0.1 2 2.55 tape drawing direction 1.5 dia. +0.1 0 13 dia. 330 2 dia. reel label tape drawing direction (19) 5.5 2.2 2 12 0.3 1.75 0.1 8+ 0.1 4+ 0.1 tape drawing direction 1.5 dia. +0.1 0
b3u b3u in the interest of product improvement, specifications are subject to change without notice. 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. a162-e1-03 printed in japan 1106-3m (1006) (c) omron corporation electronic components company switch division manual switch department shiokoji horikawa, shimogyo-ku, kyoto, 600-8530 japan tel: (81)75-344-7096/fa x: (81)75-344-7188
5 precautions precautions safety precautions precautions for safe use use the switch within the rated voltage and current ranges, other- wise the switch may have a shortened life expectancy, radiate heat, or burn out. this particularly applies to the instantaneous voltages and currents when switching. precautions for correct use storage to prevent degradation, such as discoloration, in the terminals during storage, do not store the switch in locations that are sub- ject to the following conditions. 1. high temperature or humidity 2. corrosive gases 3. direct sunlight handling 1. operation do not repeatedly operate the switch with excessive force. apply- ing excessive pressure or applying additional force after the plunger has stopped may deform the disc spring of the switch, resulting in malfunction. in particular, applying excessive force to side-operated switches may damage the caulking, which in turn may damage the switch. do not apply force exceeding the maxi- mum (29.4 n for 1 minute, one time) when installing or operating side-operated switches. be sure to set up the switch so that the plunger will operate in a straight vertical line. a decrease in the life of the switch may result if the plunger is pressed off-center or from an angle. 2. dust protection do not use switches that are not sealed in dust-prone environ- ments. doing so may cause dust to penetrate inside the switch and cause faulty contact. if a swit ch that is not sealed must be used in this kind of environment, use a sheet or other measure to protect it against dust. pcbs the switch is designed for a 1.6-mm thick, single-side pcb. using pcbs with a different thickness or using double-sided, through-hole pcbs may result in loose mounting, improper inser- tion, or poor heat resistance in so ldering. these effects will occur, depending on the type of holes and patterns of the pcb. there- fore, it is recommended that a verification test is conducted before use. if the pcbs are separated after mounting the switch, particles from the pcbs may enter the switch. if pcb particles or foreign particles from the surrounding environment, workbench, contain- ers, or stacked pcbs become attached to the switch, faulty con- tact may result. soldering 1. general precautions before soldering the switch on a multilayer pcb, test to confirm that soldering can be performed properly. otherwise the switch may be deformed by the soldering heat on the pattern or lands of the multilayer pcb. do not solder the switch more than twice, including rectification soldering. an interval of five minutes is required between the first and second soldering. 2. automatic soldering baths (b3f, b3w, b3wn, b3m, b3j) soldering temperature: 260 c max. soldering time: 5 s max. for a 1.6-mm thick single-side pcb preheating temperature: 100c max. (ambient temperature) preheating time: within 60 s make sure that no flux will rise above the level of the pcb. if flux overflows onto the mounting surface of the pcb, it may enter the switch and cause a malfunction. 3. reflow soldering (surface mounting) solder the terminals within the heating curve shown in the follow- ing diagram. b3s, b3sn, b3fs note: the above heating curve applies if the pcb thickness is 1.6 mm. the peak temperature may vary depending on the reflow bath used. confirm the conditions beforehand. do not use an automatic soldering bath for surface-mounted switches. the soldering gas or flux may enter the switch and damage the switch?s push-button operation. 4. manual soldering (all models) soldering temperature: 350 c max. at the tip of the soldering iron soldering time: 3 s max. for a 1.6-mm thick, single-side pcb before soldering the switch on a pcb, make sure that there is no unnecessary space between the switch and the pcb. washing 1. washable and non-washable models standard switches are not sealed, and cannot be washed. doing so will cause the washing agent, together with flux or dust parti- cles on the pcb, to enter the switch, resulting in malfunction. operating par t plunger incorrect incorrect correct switch resin sheet washable (sealed types) b3w, b3wn, b3s, b3sn non-washable (standard types) b3f, b3fs, b3m, b3j, b3da, b3d pcb surface flux surface temperature ( c) 220 180 max. 250 150 room temperature preheating time (s) 60 to 120 max. 60
6 precautions precautions 2. washing methods washing equipment incorporating more than one washing bath can be used to clean washable models, provided that the wash- able models are cleaned for one minute maximum per bath and the total cleaning time does not exceed three minutes. 3. washing agents apply alcohol-based solvents to clean washable models. do not apply any other agents or water to clean any washable model, as such agents may degrade the materials or performance of the switch. 4. washing precautions do not impose any external force on washable models while washing. do not clean washable models immediately after soldering. the cleaning agent may be absorbed into the switch through respira- tion as the switch cools. wait for at least three minutes after sol- dering before cleaning washable models. do not use sealed switches while submersed in water or in loca- tions exposed to water. switch packaging (taping specification models) 1. radial types the tape is packaged by fan-folding into the box, as shown in the following diagram. do not apply any external force to the packaging box, or subject it to vibration. doing so may deform the switch terminals. remove the tape slowly, making sure that the switches are not entangled or caught. otherwise the terminals may be deformed. do not store the packaged switches in locations subject to high temperatures or high humidity. the packaging boxes are sealed with paper tape and are not airtight. storing the packaged switches in locations with high temperature or high humidity may result in deterioration of the tape and switches, and long-term storage under such conditions may cause discoloration of the switch terminals. 2. packaging specifications for embossed taping (b3fs-1000p/-1002p, b3sn) note: switches with ground terminals are packaged with the ground terminal on the opposite side of the guide hole. b3fs-1010p modelabc b3f 50 mm 325 mm 275 mm b3wn 53 mm 326 mm 350 mm switches on taping packaging box fan-folded tape b a c 380 2 dia. 13 dia. reel label tape drawing direction (18) standards conforms to jeita. package 3,000 switches heat resistance 50 c for 24 hours (without deformation) standards conforms to jeita. package 1,000 switches heat resistance 60 c for 24 hours (without deformation) 8 0.1 4 0.1 1.75 0.1 5.5 12 0.3 a 2 tape drawing direction 1.5 dia. +0.1 0 model a b3fs-1000p b3fs-1002p 3.9 mm b3sn 3.6 mm 13 dia. 330 dia. reel (made of paper) label tape drawing direction (22) 4 0.1 2 16 7.5 1.75 12 0.1 tape drawing direction (4.7) 1.5 dia. +0.1 0
7 precautions precautions b3fs-1050p b3s note: switches with ground terminals are packaged with the ground terminal on the opposite side of the guide hole. leds (b3j) make sure that the polarity of the leds is correct. the polarity is not indicated on the switch, but the positive pole is located on the back surface of the switch on the side without the omron mark. connect limiting resistors to the leds. the switch does not have built-in limiting resistors, so satisfy the led characteristics by obtaining the limiting resistance according to the following formula based on the voltage to be used. standards conforms to jeita. package 1,000 switches heat resistance 60 c for 24 hours (without deformation) standards conforms to jeita. package 1,000 switches heat resistance 50 c for 24 hours (without deformation) 380 2 dia. 13 dia. reel (made of paper) label tape drawing direction (22) 4 0.1 2 16 0.3 7.5 1.75 0.1 12 0.1 tape drawing direction (8.1) 1.5 dia. +0.1 0 13 dia. 330 dia. reel label tape drawing direction 21.5 4.7 0.4 0.06 8.7 7 9.4 1.5 4 0.1 2 1 6 7.5 1.75 12 0.1 tape drawing direction 1.5 dia. +0.1 0 e r v f i f limiting resistance (r)= (voltage used (e) ? led forward voltage (vf)) led forward current (if) ( ? ) red ? 20 0 50 40 30 20 10 0 20 40 60 8 0 ambient temperature ta ( c) forward current i f (ma) yellow/green red yellow green 1.5 1.7 1.6 50 30 10 3 1 0.5 5 1.8 1.9 2.0 2.1 forward voltage v f (v) forward current i f (ma)
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