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 * Surface mount normally open switch * Capable of switching 200Vdc or 0.5A at up to 10W Benefits * Hermetically sealed switch contacts are not affected by and have no effect on their external environment Note: Contact Littelfuse for specific agency approval ratings. Dimensions Dimensions in mm (inch) O2.28 MAX (.090) RECOMMENDED LAND PATTERN 2x3.05 (.120) 2.84 MAX (.112) 19.300.25 (.760.010) 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 * Zero operating power required for contact closure * Excellent for switching microcontroller logic level loads Applications 2x1.140.10 (.045.004) 17.520.25 (.690.010) 14.00 MAX (.551) * Low close/open hysteresis (close differential) * Industrial Controls * Office Equipment * Home Appliances * Position Sensing * Level Sensing * Security 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 - max. - min. 0.100 1010 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 Resistance 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. (c) 2020 Littelfuse Revised: BO.12/07/20 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 12 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 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. Packaging Packaging Option Tape and Reel Packaging Specification EIA-RS-481-1 (c) 2020 Littelfuse Revised: BO.12/07/20 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) (c) 2020 Littelfuse Revised: BO.12/07/20 Specifications are subject to change without notice. littelfuse.com