Surface Mount Reed Switches Low Power > MDSM-4 MDSM-4 15.3mm Surface Mount Reed Switch RoHS Description The MDSM-4 surface mount reed switch is a sub-miniature, normally open switch with a 15.24mm long x 2.28mm diameter (0.600” x 0.090”) glass envelope, capable of switching 200Vdc at 10W. This reed switch is a surface mount version of MDCG-4. It has high insulation 10 resistance of 10 ohms minimum and a contact resistance of less than 100 milliohms. Features • Capable of switching 200Vdc or • Surface mount, normally 0.5A at up to 10W open switch Agency Approvals • Available sensitivity 12-38 AT • Low, stable contact resistance Agency Agency File Number Ampere-Turns Range Benefits E47258 12-38 AT E471070 • Zero operating power required for • Hermetically sealed switch contact closure contacts are not affected by and DEMKO 14 ATEX 1393U 12-38 AT • Excellent for switching micro- have no effect on their external controller logic level loads environment Dimensions Ø2.28 1.00±0.10 Applications Dimensions in mm (inch) (.090)MAX (.039±.004) • Position Sensing • Security • Level sensing • Limit Switching • Industrial Controls • Office Equipment 17.52±0.25 (.690±.010) 15.24 Switch Type (.600)MAX 2.84 MAX (.112) Contact Form A (SPST-NO) 19.30±0.25 Body: Glass (.760±.010) Materials 2x0.00 MIN Leads: Tin-plated Ni-Fe wire (.000) RECOMMENDED LAND PATTERN Note: SPST-NO = Single-pole, single-throw, normally open 2x1.30 (.051) 2x2.34 (.092) 16.00 (.630) Note: Land pattern is Littelfuse recommendation only. User is responsible for proper PCB design. Electrical Ratings 1 Contact Rating W/VA - max. 10 2 Switching Vdc - max. 200 3 Voltage Vac - max. 140 4 Breakdown Vdc - min. 250 2 Switching Adc - max. 0.50 3 Current Aac - max. 0.35 Carry Adc - max. 1.20 Contact, Initial Ω - max. 0.100 Resistance 10 Insulation Ω - min. 10 Capacitance Contact pF - typ. 0.2 Operating °C -40 to +125 Temperature 5 °C -65 to +125 Storage 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 littelfuse.com Specifications are subject to change without notice. Surface Mount Reed Switches Low Power > MDSM-4 MDSM-4 15.3mm Surface Mount Reed Switch Product Characteristics Operating Characteristics 1 Operate Time 0.6ms - max. 1 Release Time 0.2ms - max. 2 Shock 11ms 1∕2 sine wave 100G - max. 2 Vibration 50-2000 Hertz 30G - max. Resonant Frequency 3.9kHz - typ. Magnetic Characteristics 3 Pull-In Range Ampere Turns 12-38 4 Rating Sensitivity 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 MDCG-4. 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 30 MDSM-4 R - 17-23 25 Series Max. 20 Packaging R = Tape and Reel B = Bulk 15 Min. AT Range Example: 12-18 AT 10 17-23 AT product in Bulk 12-23 AT packaging is MDSM-4B-17-23 17-23 AT 5 17-28 AT 22-28 AT 22-33 AT 0 27-33 AT 0 5 10 15 20 25 30 35 40 27-38 AT Pull-In (AT, L4989 Coil) 32-38 AT Note: Chart represents the range of Drop-Out, min to max, for a given Pull-In value of Note: These AT values are the before-modification values of the bare reed switch. the MDCG-4 prior to modification into the MDSM-4. Additional Information Datasheet Resources Samples Packaging Packaging Option Packaging Specification Quantity Quantity and Packaging Code Taping Width Tape and Reel EIA-RS-481-1 3000 R 32mm Bulk N/A 200 B N/A © 2015 Littelfuse © 2015 Littelfuse littelfuse.com littelfuse.com Specifications are subject to change without notice. Specifications are subject to change without notice. Drop-Out (AT, L4989 Coil) Surface Mount Reed Switches Low Power > MDSM-4 MDSM-4 15.3mm Surface Mount Reed Switch TAPE DIMENSIONS mm (inch) +.004 (.059 ) (.315) -0 +0,10 8,00 Ø1,50 -0 (.079) 2,00 (.069) (.157) 1,75 4,00 7.5° (.559) (.240) 14,20 6,10 (1.118) (1.260) (.670) (.830) 17,02 21,08 28,40 32,00 (.079) +.006 Ø2,00 (.067 ) -.002 +0,15 Ø1,70 -0,05 (.240) +.004 (.016) (.059 -0 ) 6,10 0,41 +0,10 Ø1,50 -0 7.5° 3.0° 1. ALL TAPE & SPROCKET HOLE DIMENSIONS (.075) ARE PER EIA-481 UNLESS NOTED (.084) 1,90 2,13 2. ALL POCKET DIMENSIONS ARE ±(.004") 0,10mm (.046) (.111) 3. ALL DIMENSIONS ARE TO INSIDE OF POCKET 1,17 2,82 REEL DIMENSIONS mm (inch) +.010 (12.992 -.03 0 ) (3.937±.020) +0,25 100,0±0,50 330,00 -0,76 (.075±.016) 1,9±0.4 TYP. (1.512) 38,4 MAX. +.008 (1.276 ) -0 +0.2 (32,4 ) -0 MEASURED AT HUB (.512±.008) Ø13,0±0.2 © 2015 Littelfuse littelfuse.com Specifications are subject to change without notice. (.827±.016) Ø21,0±0.4 120° TYP.