Axial Lead Reed Switches Low Power > MDRR-DT MDRR-DT 14.7mm Miniature Changeover Reed Switch RoHS Description The MDRR-DT Reed Switch is a miniature changeover switch with a 14.73mm long x 2.54mm diameter (0.580” x 0.100”) glass envelope, capable of switching 175Vdc at 5W. It has insulation resistance of 10 9 ohms minimum, and contact resistance less than 100 milli-ohms. The MDRR-DT is available in surface mount version, that is, MDSM-DT. Features • Miniature SPDT changeover switch • Capable of switching 175Vdc or 0.25A at up to 5W Benefits Agency Approvals Agency • Available sensitivity range 10-30 AT Agency File Number Ampere-Turns Range E47258 E471070 10-30 AT DEMKO 14 ATEX 1393U 10-30 AT • Hermetically sealed switch contacts are not affected by and have no effect on their external environment • Can be used as changeover or normally closed contact • Zero operating power required for contact closure • Excellent for switching microcontroller logic level loads Applications Dimensions • Position Sensing • Reed Relays • Industrial Controls Dimensions in mm (inch) F - Formed CL OF OVERLAP 0.20 (.008) MIN. AT 1.6 FROM SEAL 0.55 (.022) MAX. 2XØ0.56 REF. (.022) Switch Type 28.32 REF. (1.115) 2.54 MAX. (.100) 4.57 REF. (.180) N.O. 2.54 REF. (.100) • Office Equipments • Home Appliances • Security Ø0.51 REF. (.020) COMMON Contact Form C (SPDT-CO) Materials Body: Glass Leads: Tin-plated Ni-Fe wire N.C. 1.57 (.062) REF. 14.73 MAX. (.580) 17.78 MIN. (.700) Note: SPDT-CO = Single-Pole, Double-Throw, Change Over 51.66 REF. (2.034) U - Unformed 0.80 REF. (.031) 52.48 REF. (2.066) N.O. N.C. Electrical Ratings Contact Rating W/VA - max. 5 Carry Contact, Initial Insulation Vdc - max. Vac - max. Vdc - min. Adc - max. Aac - max. Adc - max. Ω - max. Ω - min. 175 120 200 0.25 0.18 1.50 0.100 109 Capacitance Contact pF - typ. 1 Temperature Operating Storage 5 °C °C -40 to +125 -65 to +125 Voltage 3 Current 3 1 Resistance Switching 2 Breakdown 4 Switching 2 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 Axial Lead Reed Switches Low Power > MDRR-DT MDRR-DT 14.7mm Miniature Changeover Reed Switch Product Characteristics Operating Characteristics Operate Time 1 0.7ms - max. Release Time 1 1ms - max. Shock 2 Vibration 11ms 1∕2 sine wave 50G - max. 50-2000 Hertz 30G - max. 2 Resonant Frequency 11.0kHz - typ. Magnetic Characteristics Pull-In Range 3 Rating Sensitivity 4 Ampere Turns 10-30 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 MDRR-DT -15-20 F Drop-Out (AT, L4989 Coil) 20 Max. Series 15 Min. 10 5 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. AT Range 10-15 AT 10-20 AT 15-20 AT 15-25 AT 15-30 AT 20-25 AT 20-30 AT 20-35 AT 25-30 AT Version F = FORMED U = UNFORMED Additional Information Example: 15-20 AT product is MDRR-DT-15-20-F or MDRR-DT-15-20-U Note: These AT values are the before-modification values of the bare reed switch. Datasheet Samples Resources Packaging Packaging Option Packaging Specification Bulk © 2015 Littelfuse Specifications are subject to change without notice. Bulk Quantity 1000 Quantity and Packaging Code N/A Taping Width N/A littelfuse.com Surface Mount Reed Switches Low Power > MASM-14 © 2015 Littelfuse Specifications are subject to change without notice. littelfuse.com