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 Note: Contact Littelfuse for specific agency approval ratings. Excellent for switching micro- have no effect on their external controller logic level loads environment Dimensions 2.28 1.000.10 Dimensions in mm (inch) (.090)MAX (.039.004) Applications Position Sensing Security Level sensing Limit Switching 17.520.25 Industrial Controls Office Equipment (.690.010) 15.24 (.600)MAX 2.84 MAX Switch Type (.112) 19.300.25 Contact Form A (SPST-NO) (.760.010) 2x0.00 MIN Body: Glass (.000) Materials RECOMMENDED LAND PATTERN Leads: Tin-plated Ni-Fe wire 2x1.30 (.051) 2x2.34 (.092) 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 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 - max. 0.100 Resistance 10 Insulation - 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. 2020 Littelfuse Revised: BO.12/08/20 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 12 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 15 B = Bulk 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. 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 2020 Littelfuse Revised: BO.12/08/20 littelfuse.com Specifications are subject to change without notice. Drop-Out (AT, L4989 Coil)