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 switch • Capable of switching 200V or 0.5A at up to 10W Agency Approvals Agency • Available sensitivity range 10-25 AT Benefits Agency File Number Ampere-Turns Range E47258 E471070 10-25 AT DEMKO 14 ATEX 1393U 10-25 AT • Hermetically sealed switch contacts are not affected by and have no effect on their external environment • Low, stable contact resistance • Zero operating power required for contact • Excellent for switching microcontroller logic level loads Applications • Reed Relays (particularly suited to ATE type applications) • Security Systems Dimensions Dimensions in mm (inch) 20.19 (.795) REF. CL OF OVERLAP 13.46 (.530) MIN. 1.80 (.071) MAX. 0.47 (0.185) DIA. REF. 12.70 (.500) MAX. 40.38 (1.590) NOM. • Limit Switching • Office Equipment Switch Type Contact Form A (SPST-NO) Materials Body: Glass Leads: Tin-plated Ni-Fe wire Note: SPST-NO = Single-pole, single-throw, normally open Electrical Ratings Contact Rating W/VA - max. 10 Vdc - max. Vac - max. Vdc - min. 200 140 250 Carry Adc - max. Aac - max. Adc - max. 0.5 0.35 0.80 Resistance Contact, Initial Insulation Ω - max. Ω - min. 0.100 1012 Capacitance Contact pF - typ. 0.3 Temperature Operating Storage 5 °C °C -40 to +125 -65 to +125 1 Switching Voltage 2 3 Breakdown Switching Current 4 2 3 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 Specifications are subject to change without notice. littelfuse.com Axial Lead Reed Switches Low Power > MDSR-7 MDSR-7 12.7mm Sub-miniature Reed Switch Product Characteristics Operating Characteristics Operate Time 1 0.6ms - max. Release Time 1 0.2ms - max. Shock 2 Vibration 11ms 1∕2 sine wave 100G - max. 50-2000 Hertz 30G - max. 2 Resonant Frequency 5.5kHz - typ. Magnetic Characteristics Pull-In Range 3 Rating Sensitivity 4 Ampere Turns 10-25 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 Drop-Out (AT, L4989 Coil) 20 Max. Series 15 AT Range 10-25 AT 10-15 AT 15-20 AT 20-25 AT Min. 10 5 Example: 10-15 AT product is MDSR-7-10-15 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 Bulk © 2015 Littelfuse Revised: 10/09/15 Specifications are subject to change without notice. Bulk Quantity 1000 Quantity & Packaging Code N/A Taping Width N/A littelfuse.com