Tactile Switch Safety Precautions Precautions ■Precautions for Safe Use 3. Usage Environment Use the Switch within the rated voltage and current ranges, otherwise 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 Storage Environment To prevent degradation, such as discoloration, in the terminals during storage, do not store the Switch in locations that are subject to the following conditions. 1. High temperature or humidity 2. Corrosive gases 3. Direct sunlight Storage condition Store the Switches in the packaging box. After the packaging box is opened, use the contents as quickly as possible. When storing leftover parts, make sure that appropriate measures are taken against humidity and corrosive gases. ● Handling 1. Operation Do not repeatedly operate the Switch with excessive force. Applying excessive pressure or applying additional force after the plunger has stopped may deform the contact dome 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 maximum (29.4 N {300 gf} 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. Operating part Plunger Incorrect Incorrect Correct Tactile Switch is not recommended to use for detection purpose due to the sort of Manual Switch. Omron's Detection Switch is recommended for this purpose. 2. Dust Protection Do not use Switches that are not sealed in dust-prone environments. Doing so may cause dust to penetrate inside the Switch and cause contact failure. If a Switch that is not sealed must be used in this kind of environment, use a sheet or other measure to protect it against dust. Resin sheet Switch Before installing the Switch, make sure that the area of installation is not subject to corrosive gases emitted from surrounding parts. Do not use in areas subject to high temperatures, high humidity, or toxic gases such as sulfuric gas (H2S, SO2), ammonia gas (NH3), nitric gas (HNO3), or chlorine gas (CI2). It can cause corrosive damage to the contacts and result in malfunction. If there is silicon in the atmosphere, it may stop the contacts from functioning properly. If silicon products, such as silicon oil, silicon filler, or silicon wires, are used in the surrounding area, install a contact protection circuit to prevent arching or remove the silicon source. The following situations may cause water to enter inside the Switch, resulting in a malfunction due to contact failure or corrosion. • Using the Switch in an outdoor environment where it is exposed to water drops for an extended period of time. • Using the Switch in an underwater setting where it is subject to strong water pressure. Do not use Switches that have been dropped. The mating section or other internal parts may be damaged, resulting in malfunction. ● 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 insertion, or poor heat resistance in soldering. These effects will occur, depending on the type of holes and patterns of the PCB. Therefore, 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, containers, or stacked PCBs become attached to the Switch, contact failure 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 the 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: 100°C 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. PCB surface Flux surface 1 Tactile Switch Safety Precautions 3. Reflow Soldering (Surface Mounting) 3. Washing Agents Solder the terminals within the heating curve shown in the following diagram. 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. Temperature ( °C) B3S, B3SN, B3FS 4. Washing Precautions 250 max. 220 180 Heating Preheating 150 Room temperature 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 respiration as the Switch cools. Wait for at least three minutes after soldering before cleaning washable models. Do not use Sealed Switches while submersed in water or in locations exposed to water. ● Switch Packaging (Taping Specification Models) 1. Radial Types 60 to 120 Max. 60 Time (s) The tape is packaged by fan-folding into the box, as shown in the following diagram. B3SL, B3U, B3AL Temperature (°C) Switches on taping Packaging box Fan-folded tape 260 max. C 220 B 180 A 150 Heating Preheating Model 60 to 120 60 max. Time (s) 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 plunger 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 Washable (sealed types) B3W, B3WN, B3S, B3SN Non-washable (standard types) B3F, B3FS, B3SL, B3W-9, B3J, B3M, B3U, B3AL Standard Switches are not sealed, and cannot be washed. Doing so will cause the washing agent, together with flux or dust particles on the PCB, to enter the Switch, resulting in malfunction. 2. Washing Methods Washing equipment incorporating more than one washing bath can be used to clean washable models, provided that the washable models are cleaned for one minute maximum per bath and the total cleaning time does not exceed three minutes. 2 A B C B3F 50 mm 325 mm 275 mm B3WN 53 mm 326 mm 350 mm 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. Tactile Switch Safety Precautions 2. Packaging Specifications for Embossed Taping <B3FS-1050P> Label (22) Tape drawing direction <B3FS-1000P, B3SN> Label (18) Tape drawing direction 13 dia. 380±2 dia. Reel (made of paper) 13 dia. 380±2 dia. Reel 8±0.1 4±0.1 1.5 +0.1 0 dia. 1.5 +0.1 0 dia. 2 12±0.1 4±0.1 1.75±0.1 2 (8.1) A 1.75±0.1 7.5 Model A B3FS-1000P 3.9 mm B3SN 3.6 mm 5.5 16±0.3 12±0.3 Tape drawing direction Tape drawing direction Standards Conforms to JEITA. Package 3,000 Switches Heat resistance 50°C for 24 hours (without deformation) Note: Switches with ground terminals are packaged with the ground terminal on the side of the guide hole. Standards Conforms to JEITA. Package 1,000 Switches Heat resistance 60°C for 24 hours (without deformation) <B3SL-1002P/1005P> (22) Label Tape drawing direction +0.1 0 dia. 1.5 2 12±0.1 4±0.1 (3.7) 1.75 <B3FS-1010P> (22) Tape drawing direction Label 7.5 16 380±2 dia. 13 dia. Tape drawing direction Reel (Material: PS) <B3SL-1022P/1025P> (22) Label Tape drawing direction +0.1 0 dia. 1.5 2 12±0.1 4±0.1 (5.3) 1.75 13 dia. Reel (Made of paper) 330 dia. 7.5 16 1.5 +0.1 0 dia. 12±0.1 4±0.1 2 380±2 dia. 13 dia. (4.7) 1.75 Reel (Material: PS) Tape drawing direction 7.5 16 Standards Conforms to JIS. Package 2,000 Switches (B3SL-1002P/1005P) 1,400 Switches (B3SL-1022P/1025P) Heat resistance 60°C for 24 hours (without deformation) Tape drawing direction Standards Conforms to JEITA. Package 1,000 Switches Heat resistance 60°C for 24 hours (without deformation) 3 Tactile Switch Safety Precautions ● LEDs (B3J) <B3S> 21.5 Tape drawing direction 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. 330 dia. 13 dia. Limiting resistance (R)= (Voltage used (E) – LED forward voltage (VF)) (Ω) LED forward current (IF) Reel E Label 1.5 +0.1 0 dia. 1.75 2 IF 7.5 1.5 Tape drawing direction 9.4 0.06 50 Forward current IF (mA) 16 7 8.7 VF R 12±0.1 4±0.1 0.4 40 Red 30 4.7 Yellow/Green 20 Standards Conforms to JEITA. Package 1,000 Switches Heat resistance 50°C for 24 hours (without deformation) 10 Note: Switches with ground terminals are packaged with the ground terminal on the opposite side of the guide hole. 0 −20 <B3U-1000 Series> Tape drawing 1.5 +0.1 dia. 0 direction 13 dia. 8+0.1 4+0.1 2 12±0.3 330±2 dia. Label Tape drawing direction 80 30 Green Yellow 10 5 +0.1 Tape drawing 1.5 0 dia. direction 13 dia. 60 50 <B3U-3000 Series> (19) 40 2.55 1.75±0.1 5.5 Reel 20 Ambient temperature Ta (°C) Forward current IF (mA) (19) 0 8+0.1 2 4+0.1 2.2 1.75±0.1 3 5.5 Red 1 12±0.3 0.5 1.5 Reel 330±2 dia. Label Standards 2.0 2.1 50°C for 24 hours (without deformation) <B3AL Series> (22) Tape drawing direction 1.5 +0.1 0 dia. 2 12±0.1 4±0.1 C Cross section C-C 1.75 13 38 0± 2 dia di 7.50 . Reference: The following standards are used to determine compliance for the six substances. Lead: 1,000 ppm max. Mercury: 1,000 ppm max. Cadmium: 100 ppm max. 16 a. C Tape drawing direction Standards Comforms to JEITA. Package 1,400 Switches Heat resistance 50°C for 24 hours (without deformation) 4 1.9 The "RoHS Compliant" designation indicates that the listed models do not contain the six hazardous substances covered by the RoHS Directive. 4,000 Switches (B3U-3000 Series) Reel 1.8 ● RoHS Compliant 3,500 Switches (B3U-1000 Series) Heat resistance 1.7 Forward voltage VF (V) Conforms to JEITA. Package 1.6 Tape drawing direction (5.5) Hexavalent chromium: 1,000 ppm max. PBB: 1,000 ppm max. PBDE: 1,000 ppm max. Tactile Switch Safety Precautions • 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. Note: Do not use this document to operate the Unit. OMRON Corporation ELECTRONIC AND MECHANICAL COMPONENTS COMPANY Contact: www.omron.com/ecb Cat. No. A205-E1-01 0812(0207)(O) 5