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 10¹² 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 DEMKO 14 ATEX 1393U 10-25 AT 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 Switch Type (0.185) DIA. REF. (.071) MAX. Contact Form A (SPST-NO) 13.46 12.70 Body: Glass Materials (.530) MIN. (.500) MAX. Leads: Tin-plated Ni-Fe wire 40.38 (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 Ω - max. 0.100 Resistance 12 Insulation Ω - 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. © 2015 Littelfuse Revised: 10/09/15 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 1∕2 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 © 2015 Littelfuse Revised: 10/09/15 littelfuse.com Specifications are subject to change without notice. Drop-Out (AT, L4989 Coil)