Reed Switches Datasheet MDSM-10 10.2mm Sub-miniature Surface Mount RoHS Description The MDSM-10 Reed Switch is a sub-miniature, surface mounting, normally open switch with a 10.16mm long x 1.80mm diameter (0.400 x 0.071) glass envelope, capable of switching 200Vdc at 10W. This reed switch is a surface mount version of the MDSR-10. It has high insulation resistance of 10 ohms minimum and low contact resistance of less than 120milli-ohms. Features & Benefits Surface mounting normally and have no effect on their open switch external environment Capable of switching 200Vdc Low space requirement or 0.5A at up to 10W Zero operating power Low, stable contact required for contact closure Agency Approvals resistance Excellent for switching Available sensitivity 10-25 AT microcontroller logic level Agency Agency File Number Ampere-Turns Range loads Hermetically sealed switch E47258 10-25 AT contacts are not affected by E471070 Note: Contact Littelfuse for specific agency approval ratings. Applications Dimensions Position Sensing Security Dimensions in mm (inch) Level Sensing Metering 1.80 1.000.10 (.071) MAX (.045 +/-.004) TYP Switch Type 12.450.25 (.490.010) 10.16 Contact Form A (SPST-NO) (.400)MAX 2.00 MAX Body: Glass (.078) Materials Leads: Tin-plated Ni-Fe wire 15.620.10 (.615.010) Note: SPST-NO = Single-pole, single-throw, normally open 2x0.00 MIN (.000) RECOMMENDED LAND PATTERN 1.30 (.051) TYP. 2.90 (.114) TYP. 11.20 (.441) 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. 1.00 - max. 0.12 Resistance Contact, Initial Insulation 12 - 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. 2021 Littelfuse, Inc. 1 Specifications are subject to change without notice. Revised: GD. 08/26/21Reed Switches Datasheet MDSM-10 10.2mm Sub-miniature Surface Mount Product Characteristics Operating Characteristics 1 Operate Time 0.5ms - max. 1 Release Time 0.1ms - max. 2 Shock 11ms 12 sine wave 100G - max. 2 Vibration 50-2000 Hertz 30G - max. Resonant Frequency 6.5kHz - typ. Magnetic Characteristics 3 Pull-In Range Ampere Turns 10-25 4 Rating Sensitivity Ampere Turns 15 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 MDSR-10. 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-10R - 10-15 Max. 20 15 Series Packaging Min. R = Tape and Reel 10 B = Bulk AT Range 5 Example: 10-25 AT 10-15 AT product in Bulk 10-15 AT 0 packaging is MDSM-10B-10-15 0 5 10 15 20 25 30 35 15-20 AT Pull-In (AT, L4989 Coil) 20-25 AT Note: Chart represents the range of Drop-Out, min to max, for a given Pull-in value of the Note: MDSR-10 prior to modification into the MDSM-10. These AT values are the before-modification values of the bare reed switch. 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 2021 Littelfuse, Inc. 2 Specifications are subject to change without notice. Revised: GD. 08/26/21 Drop-Out (AT, L4989 Coil)