Surface Mount Reed Switches Low Power > MDSM-DT MDSM-DT 14.7mm Surface Mount Changeover Reed Switch RoHS Description The MDSM-DT Reed Switch is a miniature, surface mounting, changeover switch with a 14.73mm long x 2.54mm diameter (0.580" x 0.100") glass envelope. It is capable of switching 175Vdc at 5W. The MDSM-DT has an insulation resistance of 10 9 ohms minimum and contact resistance less than 100 milli-ohms. This reed switch is a surface mount version of the MDRR-DT. Features * Surface mount SPDT changeover switch * Capable of switching 175Vdc or 0.25A at up to 5W Agency Approvals Agency Benefits Agency File Number Ampere-Turns Range E47258 E471070 15-30 AT DEMKO 14 ATEX 1393U 15-30 AT * Hermetically sealed switch contacts are not affected by and have no effect on their external environment Applications 2.540.38 (.100.015) * Position Sensing O0.56 * Level SensingN.O. (.022) * Industrial Controls Dimensions Dimensions in mm (inch) 2.540.38 (.100.015) O0.56 (.022) N.O. 14.73 (.580)MAX O2.54 (.100)MAX CL OF OVERLAP 0.025 (.001)MIN 20.320.25 (.800.010) 25.400.25 (1.000.010) RECOMMENDED LAND PATTERN Electrical Ratings Voltage 3 Current 3 10.670.51 (.420.020) Switch Type O0.56 (.022) COMMON LEAD O0.51 (.020) COMMON LEAD CL OF OVERLAP O0.51 (.020) 19.30 (.760) 1 0.51 0.94 (.020) (.037) 20.320.25 Leads: Tin-plated (.800.010) 25.400.25Change-Over Note: SPDT-CO = Single-Pole, Double-Throw, (1.000.010) RECOMMENDED LAND PATTERN 19.30 (.760) 3.50 (.138)TYP Switching 2 Breakdown 4 Switching 2 Carry Resistance Contact, Initial Insulation Capacitance Contact Operating Storage 5 Temperature 0.025 (.001)MIN Body: Glass 2.87 (.113)MAX 1.60 (.063)TYP C (SPDT-CO) Materials Note: Land pattern is Littelfuse recommendation only. User is responsible for proper PCB design. Contact Rating * Office Equipments O2.54 Mobile (.100)MAX Phones 14.73 * (.580)MAX Contact Form 10.670.51 (.420.020) * Zero operating power required for contact closure * Excellent for switching microcontroller logic level loads N.C. N.C. O0.56 (.022) * Available sensitivity 15-30 AT 0.51 0.94 (.020) (.037) W/VA - max. Vdc - max. Vac - max. Vdc - min. Adc - max. Aac - max. Adc - max. - max. - min. pF - typ. C C 2.87 Ni-Fe(.113)MAX wire 3.50 (.138)TYP 1.60 (.063)TYP 5 175 120 200 0.25 0.18 1.50 0.100 109 1.0 -40 to +125 -65 to +125 Notes: 1. Contact rating - Product of the switching voltage and current should never exceed the wattage rating. Contact Littelfuse for additional load/life information. 2. When switching inductive and/or capacitive loads, the effects of transient voltages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details. 3. Electrical Load Life Expectancy - Contact Littelfuse with voltage, current values along with type of load. 4. Breakdown Voltage - per MIL-STD-202, Method 301. 5. Storage Temperature - Long time exposure at elevated temperature may degrade solderability of the leads. (c) 2015 Littelfuse Specifications are subject to change without notice. littelfuse.com Surface Mount Reed Switches Low Power > MDSM-DT MDSM-DT 14.7mm Surface Mount Changeover Reed Switch Product Characteristics Operating Characteristics Operate Time 1 Release Time 1 Shock 0.7ms - max. 1.0ms - max. 11ms 12 sine wave 2 Vibration 50G - max. 50-2000 Hertz 2 30G - max. Resonant Frequency 11.0kHz - typ. Magnetic Characteristics Pull-In Range 3 Rating Sensitivity 4 Ampere Turns 15-30 Ampere Turns 20 Test Coil L4989 Notes: 1. Operate (including bounce)/Release Time - per EIA/NARM RS-421-A, diode suppressed coil (Coil II). 2. Shock and Vibration - per EIA/NARM RS-421-A and MIL-STD-202. 3. Pull-In Range - Contact Littelfuse for narrower AT ranges available. These AT values are the before modification AT of the MDRR-DT. 4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value. Drop-Out vs. Pull-In Chart Part Numbering System 25 MDSM-DTR - 15-20 Drop-Out (AT, L4989 Coil) 20 Max. 15 Series Packaging R = Tape and Reel B = Bulk Min. AT Range 15-30 AT 15-20 AT 20-25 AT 25-30 AT 10 5 Example: 15-20 AT product in Bulk packaging is MDSM-DTB-15-20 Note: These AT values are the before-modification values of the bare reed switch. 0 0 5 10 15 20 25 30 35 Pull-In (AT, L4989 Coil) Additional Information Note: Chart represents the range of Drop-Out, min to max, for a given Pull-In value of the MDRR-DT prior to modification into the MDSM-DT. Datasheet Resources Samples Packaging Packaging Option Tape and Reel Packaging Specification Quantity Quantity and Packaging Code Taping Width EIA-RS-481-1 3000 R 32mm N/A 200 B N/A Bulk (c) 2015 Littelfuse Specifications are subject to change without notice. littelfuse.com Surface Mount Reed Switches Low Power > MDSM-DT MDSM-DT 14.7mm Surface Mount Changeover Reed Switch TAPE DIMENSIONS mm (inch) (.059 (.315) 8,00 +.004 -0 ) +0.10 -0 O1,50 (.079) 2,00 (.069) 1,75 (.157) 4,00 3.0 (.240) 6,10 (.118) 3,00 (.222) 5,63 (.795) 20,20 (1.591) 40,40 (1.732) 44,00 (1.024) 26,00 (.079) O2,00 +.006 (.067 -.002 ) 1,70+0,15 -0,05 (.118) 3,00 (.059 (.240) 6,10 +.004 -0 ) 1,50 +0,10 -0 (.138) 3,50 (.014) 0,36 3.0 (.106) 2,70 (.039) 1,00 (.129) 3,28 1. ALL TAPE & SPROCKET HOLE DIMENSIONS ARE PER FIA-481 UNLESS NOTED 2. ALL POCKET DIMENSIONS ARE (.004") 0,10mm 3. ALL DIMENSIONS ARE TO INSIDE OF POCKET REEL DIMENSIONS mm (inch) (3.937.020) 100,00,5 -0,76 (1.984) 50,4 MAX. ) 16 .0 4 27 0. ( .8 21,0 O 12 0 T YP . (.075.016) 1,90.4 TYP. +.010 (12.992-.030 ) 330,00 +0,25 (1.748+.008 ) -0 (44,4 +0.2 ) -0 MEASURED AT HUB (.512.008) O13,00.2 (c) 2015 Littelfuse Specifications are subject to change without notice. littelfuse.com