littelfuse.com© 2015 Littelfuse Revised: 12/16/15
Specifications are subject to change without notice.
MDRR-DT 14.7mm Miniature Changeover Reed Switch
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.
Agency Approvals
Agency Agency File Number Ampere-Turns Range
E47258
E471070
10-30 AT
DEMKO 14 ATEX 1393U 10-30 AT
Switch Type
Contact Form C (SPDT-CO)
Materials
Body: Glass
Leads: Tin-plated Ni-Fe wire
Axial Lead Reed Switches
Features
• Miniature SPDT changeover switch
• Capable of switching 175Vdc or
0.25A at up to 5W
• Available sensitivity range
10-30 AT
Benefits
• 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
• Position Sensing
• Reed Relays
• Industrial Controls
• Office Equipments
• Home Appliances
• Security
Dimensions
Dimensions in mm (inch)
Low Power > MDRR-DT
RoHS
Note: SPDT-CO = Single-Pole, Double-Throw, Change Over
Electrical Ratings
Contact Rating
1
W/VA - max. 5
Voltage
3
Switching
2
Breakdown
4
Vdc - max.
Vac - max.
Vdc - min.
175
120
200
Current
3
Switching
2
Carry
Adc - max.
Aac - max.
Adc - max.
0.25
0.18
1.50
Resistance
Contact, Initial
Insulation
Ω - max.
Ω - min.
0.100
10
9
Capacitance Contact pF - typ. 1
Temperature
Operating
Storage
5
°C
°C
-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.
COMMON
N.O.
N.C.
N.O.
0.20 (.008) MIN.
2XØ0.56 REF.
(.022)
Ø0.51 REF.
(.020)
AT 1.6 FROM SEAL
CL OF OVERLAP
28.32 REF.
(1.115)
2.54 MAX.
(.100)
17.78 MIN.
(.700)
51.66 REF.
(2.034)
52.48 REF.
(2.066)
0.80 REF.
(.031)
14.73 MAX.
(.580)
4.57 REF.
(.180)
. (.100)
1.57 (.062) REF.
0.55 (.022) MAX.
U - Unformed
Note: Contact Littelfuse for specific agency approval ratings.
