Surface Mount Reed Switches Low Power > MASM-14 MASM-14 14mm Close-Differential Reed Switch RoHS Description The MASM-14 surface mount reed switch is a close-differential, sub-miniature, normally open switch with a 14mm long x 2.28mm diameter (0.551” x 0.090”) glass envelope, capable of switching 200Vdc at 10W. This reed switch is a surface mount version of MACD-14. It has high insulation resistance of 1010 ohms minimum and a contact resistance of less than 100 milliohms. Both reed switches are intended for use in applications that require low hysteresis between Pull-In and Drop-Out values. Features Agency Approvals Agency Agency File Number Ampere-Turns Range E47258 E471070 10-30 AT Benefits DEMKO 14 ATEX 1393U 10-30 AT • Hermetically sealed switch contacts are not affected by and have no effect on their external environment Dimensions Dimensions in mm (inch) Ø2.28 MAX (.090) • Zero operating power required for contact closure • Excellent for switching microcontroller logic level loads • Industrial Controls • Office Equipment • Home Appliances • Position Sensing • Level Sensing • Security RECOMMENDED LAND PATTERN 2x3.05 (.120) 2.84 MAX (.112) 19.30±0.25 (.760±.010) • Low close/open hysteresis (close differential) Applications 2x1.14±0.10 (.045±.004) 17.52±0.25 (.690±.010) 14.00 MAX (.551) 2x0.00 MIN (.000) 2x1.65 (.065) 14.60 (.575) Note: Land pattern is Littelfuse recommendation only. User is responsible for proper PCB design. Electrical Ratings Contact Rating • Surface mount normally open switch • Capable of switching 200Vdc or 0.5A at up to 10W 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 W/VA - max. 10 Vdc - max. Vac - max. Vdc - min. 200 140 200 Carry Adc - max. Aac - max. Adc - max. 0.50 0.35 1.00 Contact, Initial Insulation Ω - max. Ω - min. 0.100 1010 Capacitance Contact pF - typ. 0.3 Temperature Operating Storage 5 °C °C -40 to +125 -65 to +125 Voltage Current 1 3 Switching 2 Breakdown 3 Resistance Switching 4 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 Surface Mount Reed Switches Low Power > MASM-14 MASM-14 14mm Close-Differential 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 5.3kHz typ Magnetic Characteristics Pull-In Range 3 Rating Sensitivity 4 Ampere Turns 10-15, 15-20, 20-25, 25-30 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. These AT ranges are the before modification AT of the MACD-14. 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 MASM-14 R - 10-15 Max. 20 Drop-Out (AT, L4989 Coil) Series Min. 15 Packaging R = Tape and Reel 10 AT Range 10-15 AT 15-20 AT 20-25 AT 25-30 AT 5 0 0 5 10 15 20 25 30 35 Additional Information Pull-In (AT, L4989 Coil) Note: Chart represents the range of Drop Out, min to max for a given Pull-In value of the MACD-14 prior to modification into the MASM-14. Datasheet Resources Samples Packaging Packaging Option Tape and Reel Packaging Specification EIA-RS-481-1 © 2015 Littelfuse Specifications are subject to change without notice. Quantity 3000 Quantity & Packaging Code R Taping Width 32mm littelfuse.com Surface Mount Reed Switches Low Power > MASM-14 MASM-14 14mm Close-Differential Reed Switch TAPE DIMENSIONS mm (inch) REEL DIMENSIONS mm (inch) © 2015 Littelfuse Specifications are subject to change without notice. littelfuse.com