Axial Lead Reed Switches Low Power > MDCG-4 MDCG-4 15.3mm Sub-miniature Reed Switch RoHS Description The MDCG-4 Reed Switch is a sub-miniature, normally open switch with a 15.24mm long x 2.28mm diameter (0.600” x 0.090”) glass envelope, capable of switching 200Vdc at 10W. It has high insulation resistance of 1010 ohms minimum and contact resistance less than 100 milli-ohms. This reed switch is also available in a surface mount version, that is, MDSM-4. Features • Sub-miniature normally open switch • Available sensitivity 12-38 AT Agency Approvals Benefits Agency File Number Ampere-Turns Range E47258 E471070 12-38 AT • Hermetically sealed switch contacts are not affected by and have no effect on their external environment DEMKO 14 ATEX 1393U 12-38 AT Applications Agency • Reed Relays • Security • Limit Switching Dimensions Dimensions in mm (inch) CL OF OVERLAP 20.19 (.795) REF. 12.19 (.480) MIN. • Capable of switching 200Vdc or 0.5A at up to 10W 0.50 (.020) DIA. REF. • Zero operating power required for contact closure • Excellent for switching microcontroller logic level loads • Level Sensing • Office Equipment • Industrial Control Switch Type 2.28 (.090) DIA. MAX. Contact Form A (SPST-NO) Materials Body: Glass Leads: Tin-plated Ni-Fe wire Note: SPST-NO = Single-pole, single-throw, normally open 15.24 (.600) MAX. 40.38 (1.590) NOM. Electrical Ratings Contact Rating Voltage Current 1 3 Switching 2 Breakdown 3 Resistance Capacitance Temperature Switching 4 2 Carry Contact, Initial Insulation Contact Operating Storage 5 W/VA - max. 10 Vdc - max. Vac - max. Vdc - min. 200 140 250 Adc - max. Aac - max. Adc - max. Ω - max. Ω - min. pF - typ. °C °C 0.50 0.35 1.20 0.100 1010 0.2 -40 to +125 -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 Specifications are subject to change without notice. littelfuse.com Axial Lead Reed Switches Low Power > MDCG-4 MDCG-4 15.24mm 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 3.9kHz - typ. Magnetic Characteristics Pull-In Range 3 Rating Sensitivity 4 Ampere Turns 12-38 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 30 MDCG-4 -12-18 Drop-Out (AT, L4989 Coil) 25 Max. 20 Series 15 Min. AT Range 12-18 AT 12-23 AT 10 17-23 AT Example: 12-18 AT product is MDCG-4-12-18 17-28 AT 5 22-28 AT 22-33 AT 0 0 5 10 15 20 25 30 35 40 Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value. 32-38 AT Additional Information Datasheet 27-33 AT 27-38 AT Pull-In (AT, L4989 Coil) Note: These AT values are the before-modification values of the bare reed switch. Samples Resources Packaging Packaging Option Packaging Specification Bulk © 2015 Littelfuse Specifications are subject to change without notice. Bulk Quantity 1000 Quantity & Packaging Code N/A Taping Width N/A littelfuse.com