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 2.54±0.38 (.100±.015) • Position Sensing Ø0.56 • Level SensingN.O. (.022) • Industrial Controls Dimensions Dimensions in mm (inch) 2.54±0.38 (.100±.015) Ø0.56 (.022) N.O. 14.73 (.580)MAX Ø2.54 (.100)MAX CL OF OVERLAP 0.025 (.001)MIN 20.32±0.25 (.800±.010) 25.40±0.25 (1.000±.010) RECOMMENDED LAND PATTERN Electrical Ratings Voltage 3 Current 3 10.67±0.51 (.420±.020) Switch Type Ø0.56 (.022) COMMON LEAD Ø0.51 (.020) COMMON LEAD CL OF OVERLAP Ø0.51 (.020) 19.30 (.760) 1 0.51 0.94 (.020) (.037) 20.32±0.25 Leads: Tin-plated (.800±.010) 25.40±0.25Change-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 Ø2.54 Mobile (.100)MAX Phones 14.73 • (.580)MAX Contact Form 10.67±0.51 (.420±.020) • Zero operating power required for contact closure • Excellent for switching microcontroller logic level loads N.C. N.C. Ø0.56 (.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. Ω - max. Ω - 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. © 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 1∕2 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 © 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 Ø1,50 (.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) Ø2,00 +.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) 100,0±0,5 -0,76 (1.984) 50,4 MAX. ) 16 ±.0 4 27 ±0. ( .8 21,0 Ø 12 0 °T YP . (.075±.016) 1,9±0.4 TYP. +.010 (12.992-.030 ) 330,00 +0,25 (1.748+.008 ) -0 (44,4 +0.2 ) -0 MEASURED AT HUB (.512±.008) Ø13,0±0.2 © 2015 Littelfuse Specifications are subject to change without notice. littelfuse.com