Axial Lead Reed Switches Low Power > MDSR-7 MDSR-7 12.7mm Sub-miniature Reed Switch RoHS Description The MDSR-7 Reed Switch is a sub-miniature, normally open switch with a 12.70mm long x 1.80mm diameter (0.500 x 0.071) glass envelope, capable of switching 200Vdc at 10W. It has high insulation resistance of 10 ohms minimum and low contact resistance of less than 100 milli-ohms. Features Sub-miniature normally open Available sensitivity range switch 10-25 AT Capable of switching 200V or 0.5A at up to 10W Agency Approvals Benefits Zero operating power required Hermetically sealed switch Agency Agency File Number Ampere-Turns Range for contact contacts are not affected by and Excellent for switching micro- have no effect on their external E47258 10-25 AT controller logic level loads environment E471070 Low, stable contact resistance Note: Contact Littelfuse for specific agency approval ratings. Applications Reed Relays (particularly suited Limit Switching Dimensions to ATE type applications) Office Equipment Dimensions in mm (inch) Security Systems 20.19 (.795) REF. 0.47 1.80 CL OF OVERLAP (0.185) DIA. REF. (.071) MAX. Switch Type Contact Form A (SPST-NO) 13.46 12.70 (.530) MIN. (.500) MAX. Body: Glass Materials 40.38 Leads: Tin-plated Ni-Fe wire (1.590) NOM. Note: SPST-NO = Single-pole, single-throw, normally open 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. 0.5 3 Current Aac - max. 0.35 Carry Adc - max. 0.80 Contact, Initial - max. 0.100 Resistance 12 Insulation - min. 10 Capacitance Contact pF - typ. 0.3 Operating C -40 to +125 Temperature 5 Storage C -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. 2020 Littelfuse Revised: BO.12/08/20 littelfuse.com Specifications are subject to change without notice.Axial Lead Reed Switches Low Power > MDSR-7 MDSR-7 12.7mm Sub-miniature 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 5.5kHz - typ. Magnetic Characteristics 3 Pull-In Range Ampere Turns 10-25 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. 4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value. 5. Custom modifications of forming and/or cutting of reed switches are available. Please contact Littelfuse. Drop-Out vs. Pull-In Chart Part Numbering System 25 MDSR-7-10-15 20 Max. Series 15 AT Range Min. 10-25 AT Example: 10 10-15 AT 10-15 AT product is 15-20 AT MDSR-7-10-15 20-25 AT 5 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) Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value. Packaging Packaging Option Packaging Specification Quantity Quantity & Packaging Code Taping Width Bulk Bulk 1000 N/A N/A 2020 Littelfuse Revised: BO.12/08/20 littelfuse.com Specifications are subject to change without notice. Drop-Out (AT, L4989 Coil)