LS71C4D1-T

Ｃ情報 SPECIFICATIONS 1/9  1. Features 1-1 Scope of application： These specifications apply to the surface mount switch, LS71C4D1-T. 1-2 Shape and dimensions： 1-3 Appearance： As per the outline drawing. Any defects that affect performances are not allowed. 1-4 Temperature range for use： －30 ～ +85 ℃ 1-5 Temperature range for storage： －40 ～ +85 ℃ (Switch must keep ON-OFF function.) 1-6 Tests and measuring conditions： Tests and measurements are performed under the standard conditions, unless specified otherwise. Normal temperature ： 20 ± 15 ℃ Normal humidity   ： 65 ± 20 % Normal pressure 86 ～ 106 kPa ： 1-7 Parts code： LS71C 4 D 1 ー T ■ Series ■Operating force 4: 2.4N ■D：Actuator ■Individual specifications code ■Packing style  2．Rating T ： Taping (basic delivery style) Maximum rating DC 12 V 、 20 mA Minimum rating DC 1 V 、 10 μA △ Product name TACTILE SWITCH △ Name LS71C4D1 △ Drawing No. Mark QTY Date Change Citizen Electronics Co., Ltd. Name Special note Format No. GQP-0013-F09-01 (UQP-U013-F03-0) Ｃ情報 SPECIFICATIONS 2/9  3. Initial characteristics 3-1 Mechanical characteristics No. Item Operating 1 force (F1) 2 Stroke (S1) Measure maximum operating force by vertically pressing the 2.4 ± 0.7 N 0.15 ± 0.07 mm Return force 3 Measuring conditions Performance 0.5 (F3) N or more 【Tip of the measuring head】 center of operating part gradually until it stops. Measure stroke by vertically pressing the center of operating part until it stops. Measure return force after vertically pressing the center of the operating part until it does not move any more. Φ2.0, flat SR0.8 Metal （SUS） Metal（SUS） For switch with plunger/actuator For other switch 3-2 Electrical characteristics No. 1 2 Item Measuring conditions Performance Vertically apply static force, which is two times that of Contact 500 resistance mΩ or less standard value, to the center of operating part and measure with 1kHz micro-current measuring instrument. Apply DC 100V between the terminals for one minute, if the Insulation 100 resistance MΩ or more switch has a metal cover, apply it between the metal cover and the terminal for one minute. Press the center of operating part at the speed of 3 - 5 times 3 Bounce 20 ms or less per second lightly, and measure bounce at ON and OFF. Refer to the figure below. △ Product name TACTILE SWITCH △ Name LS71C4D1 △ Drawing No. Mark QTY Date Change Citizen Electronics Co., Ltd. Name Special note Format No. GQP-0013-F09-01 (UQP-U013-F03-0) Ｃ情報 SPECIFICATIONS 3/9  4. Durability test 4-1 Details of the tests Item No. Test conditions 1) DC 1 Operating life 5 mA resistance load 2) Test speed V : 2 times/second 3) Test force : 3.1 12 , N 4) Number of times of the test 5) Force load : 100 : k times Coil spring 85 After exposure to the ambient condition of 2 Heat resistance ± 96 ℃ for 2 hours, expose test pieces for one hour in normal temperature and humidity and measure at standard condition. -40 After exposure to the ambient condition of 3 Cold resistance ± 96 ℃ for 2 hours, expose test pieces for one hour in normal temperature and humidity and measure at standard condition. Water droplets should be removed. 60 After exposure to the ambient condition of 4 ± ℃ and 2 Humidity relative humidity of resistance one hour in normal temperature and humidity and measure at standard condition. 90～95 96 % for hours, expose test pieces for Water droplets should be removed. A 5 Temperature cycle B A ＝ 90 ℃ B ＝ 20 ℃ C ＝ -40 ℃ D ＝ 0.5 h E ＝ 0.25 h F ＝ 0.5 h G ＝ 0.25 h After applying the temperature cycle C 10 as per the diagram on the left D E F G cycles, measure the test piece. Water droplet should be removed. 1.5 Total amplitude of 6 Vibration In case of sweep, resistance Vibrating directions: X, Y and Z. Test hours: total 7 8 9 mm. Vibration frequency of Shock 6 10-55-10 Shock are applied Stopper 30 3 Apply static force of intensity part for Withstand Apply AC Hz for approximately one minute. 2 hours for each direction, hours. Shock acceleration resistance 55 Hz. to 10 G. Shock directions X, Y and Z. times for each 3 directions, total 30 9 times. N vertically to the center of operating 15 seconds. 250 V (50Hz or 60Hz) for 1 minute. voltage △ Product name TACTILE SWITCH △ Name LS71C4D1 △ Drawing No. Mark QTY Date Change Citizen Electronics Co., Ltd. Name Special note Format No. GQP-0013-F09-01 (UQP-U013-F03-0) Ｃ情報 SPECIFICATIONS 4/9 4-2 Failure judgment criteria Judgment item No. Measurement condition Failure judgment criteria 1 Operating force Refer to 3-1. Measuring conditions ±30 2 Contact resistance Refer to 3-2. Measuring conditions 10 3 Insurance resistance Refer to 3-2. Measuring conditions 10 MΩ or less 4 Bounce Refer to 3-2. Measuring conditions 30 ms. or more when both ON and OFF. % or more of initial value. Ω or more  5. Recommended soldering conditions 5-1 Reflow soldering (1) Temperatures of both pre-heating and main heating of the reflow furnace are to be set in accordance with the following temperature profile. (2) Maximum reflow number of times allowed: 2 times (3) For improving solder wetness, it is recommended to plate the surface of PCB pattern with Au. (4) Recommended solder paste: S70G Type 5 from Senju Metal Industrial Co., Ltd. or similar. 2nd reflow should be conducted after the switch has cooled to normal temperature. If you use paste other than our recommendation, please verify it carefully before use. (5) Conditions can change for each reflow furnace, therefore sufficient verification prior to production is required. (6) As for PCB pattern and opening shape of the metal mask, refer to Page 7. (7) The standoff amount of SW after soldering should be controlled to be less than 50um. 5-2 Manual soldering (1) Use a soldering iron of 20W or less and keep the temperature of the tip to less than 350℃, (2) Pay attention to the soldering iron so that it does not touch product directly when handling. (3) After soldering, care must be taken not to handle the switch until its temperature cools and and use only one time for less than 3 seconds. returns to normal temperature. △ Product name TACTILE SWITCH △ Name LS71C4D1 △ Drawing No. Mark QTY Date Change Citizen Electronics Co., Ltd. Name Special note Format No. GQP-0013-F09-01 (UQP-U013-F03-0) Ｃ情報 SPECIFICATIONS 5/9 6. Packing specifications 6-1. Moisture proof-packing Switches are packed in an aluminum envelope to retain the initial product quality. Packed quantity: reels/bag 2 (Depending on the shipped quantity, 1 reel is in a bag.) Reel Aluminium bag Label 6-2. Taping specification (In accordance with JIS C 0806-3) Packed quantity: 4,000 pcs./reel Ｃ Ｕ Ｓ ＴＯ Ｍ Ｅ Ｒ ＴＹＰＥ ： P ．No. ： Lot № ： ＊ ＊＊ ＊ ＊ ＊＊ Q ’ty ： ＊ ＊＊ ＊ ＊ CITIZEN ELECTRONICS .0 R 1 21 ±0 0 .2 φ60±1 1 3. 0± φ180 2±0.5 .8 PASS Label position 9±0.3 11.4±1.0 6-3. Tape dimensions Direction of pulling out *Even if the orientation of the switch mounting is incorrect (180 degrees reversed), there is no problem with its function. K 0.8 ± 0.05mm T 0.25 ± 0.05mm △ Product name TACTILE SWITCH △ Name LS71C4D1 △ Drawing No. Mark QTY Date Change Citizen Electronics Co., Ltd. Name Special note Format No. GQP-0013-F09-01 (UQP-U013-F03-0) Ｃ情報 SPECIFICATIONS 6/9 7. Recommendation for design (Unit:mm) 7-1. Recommended tip shape of the key cap Design the key cap referring to the recommended shape in the right drawing. 7-2. Recommended operating condition: Offset Design the offset amount between the center of operating part and that of key cap as 0.4mm Max. 7-3. Recommended operating condition: Tilt Design the tilt of key cap to be within 90±2° 7-4.Recommended operating condition: Material Select hard resin as the key cap material. Soft material such as rubber is not recommended because it can impact on the characteristics. Notes: This section is for operation guarantee and not for characteristics guarantee (Section 3). △ Product name TACTILE SWITCH △ Name LS71C4D1 △ Drawing No. Mark QTY Date Change Citizen Electronics Co., Ltd. Name Special note Format No. GQP-0013-F09-01 (UQP-U013-F03-0) Ｃ情報 SPECIFICATIONS 7/9 8. Outline dimensional drawing Unit: mm Tolerance: ±0.2 Notes: (1) Please design dimensions of metal mask for solder printing in the same dimensions as outline of soldering pattern. 0.1mm thickness of metal mask is recommended. (2) Please measure the height of the switch with a dial gauge. (Initial force: 30gf) △ Product name TACTILE SWITCH △ Name LS71C4D1 △ Drawing No. Mark QTY Date Change Citizen Electronics Co., Ltd. Name Special note Format No. GQP-0013-F09-01 (UQP-U013-F03-0) Ｃ情報 SPECIFICATIONS 8/9 9. Sectional plan ５ ４ ３ ２ １ No. Part name Material Remarks 1 Circuit board FR-4 － 2 Spring Stainless － 3 Adhesive sheet Polyimide － 4 Waterproof sheet Polyimide － 5 Actuator Polyimide － △ Product name TACTILE SWITCH △ Name LS71C4D1 △ Drawing No. Mark QTY Date Change Citizen Electronics Co., Ltd. Name Special note Format No. GQP-0013-F09-01 (UQP-U013-F03-0) Ｃ情報 SPECIFICATIONS 9/9  10. Precautions (1) This switch is not applicable for use in automobiles. If you intend to use the switch for automobiles, please notify us before use for sure. Do not use this switch in the equipment which requires high level safety and reliability, such as aviation apparatus, medical equipment etc. (2) If a short circuit is anticipated between the terminals due to high temperature high humidity, condensation or water droplets, please apply coating on the surface of solder. (3) Storage period of product Before opening the moisture proof bag: Within 6 months after shipped from us and stored under normal temperature and humidity. After opening the bag, store products under normal temperature and normal humidity conditions and use them soon. Store the switch in the place where the sunlight does not shine on and corrosive gus does not generate. (4) Do not use a switch so that stress is applied from the side to the plunger or actuator of the switch. It can cause damage or peeling off. (5) Care must be taken to ensure that a force bigger than the specified value by the stopper intensity is not applied to the switch operating part. Physical stress should not be applied to the main body of switch other than the operating part. (6) Do not apply a shock to the switch. If a shock is inevitable as a result of the structure used, it is recommended to build a stopper function and so on. (7) Warpage of the mounting PCB/FPC or PCB/FPC support can affect the performance and/or reliability of the switch. Pay attention to the impact of warpage when designing. (8) This switch was designed under the assumption that it would not remain pressed for a long time. If you intend to use the switch in such a way, contact us before use. (9) If you intend to wash the switch with solvent after SMT soldering or manual soldering, contact us in advance. (10) When a switch is used for a set which requires critical safety, verify the influence brought by the failure of the switch itself in advance and secure the safety by preparing solutions such as a protective circuit, protective device or fail-safe design, etc. (11) Do not use the switch in the process or with the method under the environment that the swtich is exposed to the pressure exceeding the range specified in item 1-6. It can affect the characteristics or reliability of the switch. (12) When If shipment it passes is started three months three months after these after specificaitons the specifications are issued are issued, and then we regard shipment the is specifications as approved by customer, even if the specifications with his approval signature are not returned to us. △ Product name TACTILE SWITCH △ Name LS71C4D1 △ Drawing No. Mark QTY Date Change Citizen Electronics Co., Ltd. Name Special note Format No. GQP-0013-F09-01 (UQP-U013-F03-0)