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 resistance of 1010 ohms minimum and a contact resistance of less than 100 milliohms. Features • Surface mount, normally open switch • Low, stable contact resistance Agency Approvals Agency Agency File Number Ampere-Turns Range E47258 E471070 12-38 AT DEMKO 14 ATEX 1393U 12-38 AT Dimensions Dimensions in mm (inch) Ø2.28 (.090)MAX • Capable of switching 200Vdc or 0.5A at up to 10W • Available sensitivity 12-38 AT Benefits • Hermetically sealed switch contacts are not affected by and have no effect on their external environment • Zero operating power required for contact closure • Excellent for switching microcontroller logic level loads Applications 1.00±0.10 (.039±.004) • Position Sensing • Level sensing • Industrial Controls 17.52±0.25 (.690±.010) 15.24 (.600)MAX • Security • Limit Switching • Office Equipment Switch Type 2.84 MAX (.112) 19.30±0.25 (.760±.010) 2x0.00 MIN (.000) RECOMMENDED LAND PATTERN 2x1.30 (.051) 2x2.34 (.092) Contact Form A (SPST-NO) Materials Body: Glass Leads: Tin-plated Ni-Fe wire Note: SPST-NO = Single-pole, single-throw, normally open 16.00 (.630) Note: Land pattern is Littelfuse recommendation only. User is responsible for proper PCB design. Electrical Ratings Contact Rating Voltage 3 Current 3 1 Resistance Capacitance Temperature Switching 2 Breakdown 4 Switching 2 Carry Contact, Initial Insulation Contact Operating Storage 5 W/VA - max. Vdc - max. Vac - max. Vdc - min. Adc - max. Aac - max. Adc - max. Ω - max. Ω - min. pF - typ. °C °C 10 200 140 250 0.50 0.35 1.20 0.100 1010 0.2 -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-4 MDSM-4 15.3mm Surface Mount Reed Switch Product Characteristics Operating Characteristics Operate Time 1 Release Time 1 Shock 0.6ms - max. 0.2ms - max. 11ms 1∕2 sine wave 2 Vibration 100G - max. 50-2000 Hertz 2 30G - max. Resonant Frequency 3.9kHz - typ. Magnetic Characteristics Pull-In Range 3 Rating Sensitivity 4 Ampere Turns 12-38 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 Drop-Out (AT, L4989 Coil) 25 Max. 20 15 Min. 10 5 0 0 5 10 15 20 25 30 35 40 Pull-In (AT, L4989 Coil) Note: Chart represents the range of Drop-Out, min to max, for a given Pull-In value of the MDCG-4 prior to modification into the MDSM-4. Series Packaging R = Tape and Reel B = Bulk AT Range 12-18 AT 12-23 AT 17-23 AT 17-28 AT 22-28 AT 22-33 AT 27-33 AT 27-38 AT 32-38 AT Example: 17-23 AT product in Bulk packaging is MDSM-4B-17-23 Note: These AT values are the before-modification values of the bare reed switch. Additional Information 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-4 MDSM-4 15.3mm Surface Mount Reed Switch TAPE DIMENSIONS mm (inch) (.059 +.004 -0 ) (.315) 8,00 (.079) 2,00 Ø1,50+0,10 -0 (.069) 1,75 (.157) 4,00 7.5° (.559) 14,20 (.240) 6,10 (1.118) 28,40 (.670) 17,02 (1.260) 32,00 (.830) 21,08 (.079) Ø2,00 (.067 +.006 -.002 ) Ø1,70+0,15 -0,05 (.240) 6,10 (.059 +.004 -0 ) (.016) 0,41 Ø1,50+0,10 -0 3.0° 7.5° (.075) 1,90 (.046) 1,17 (.111) 2,82 (.084) 2,13 1. ALL TAPE & SPROCKET HOLE DIMENSIONS ARE PER EIA-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±0,50 -0,76 (1.512) 38,4 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 (1.276+.008 ) -0 (32,4 +0.2 ) -0 MEASURED AT HUB (.512±.008) Ø13,0±0.2 © 2015 Littelfuse Specifications are subject to change without notice. littelfuse.com