Axial Lead Reed Switches
Low Power > MDRR-DT
MDRR-DT 14.7mm Miniature Changeover Reed Switch
RoHS
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.
Features
• Miniature SPDT changeover switch
• Capable of switching 175Vdc or
0.25A at up to 5W
• Available sensitivity range
10-30 AT
Agency Approvals
Agency
Agency File Number
E47258
E471070
DEMKO 14 ATEX 1393U
Note: Contact Littelfuse for specific agency approval ratings.
Benefits
Ampere-Turns Range
10-30 AT
10-30 AT
• 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)
F - Formed
CL OF OVERLAP
28.32 REF
.
(1.115)
2.54 MAX.
(.100)
Ø0.51 REF
.
(.020)
COMMON
14.73 MAX.
(.580)
51.66 REF
.
(2.034)
17 MIN.
.78
(.700)
0.20 (.008) MIN.
AT 1.6 FROM SEAL
0.55 (.022) MAX.
2XØ0.56 REF
.
(.022)
N.O.
2.54 REF (.100)
.
N.C.
1.57 (.062) REF
.
4.57 REF
.
(.180)
Switch Type
Contact Form
Materials
C (SPDT-CO)
Body: Glass
Leads: Tin-plated Ni-Fe wire
Note: SPDT-CO = Single-Pole, Double-Throw, Change Over
U - Unformed
0.80 REF
.
(.031)
N.O.
N.C.
52.48 REF
.
(2.066)
Electrical Ratings
Contact Rating
Voltage
Current
3
1
W/VA - max.
Switching
2
5
175
120
200
0.25
0.18
1.50
0.100
10
9
1
-40 to +125
-65 to +125
3
Breakdown
4
Switching
2
Carry
Contact, Initial
Insulation
Contact
Operating
Storage
5
Resistance
Capacitance
Temperature
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
pF - typ.
°C
°C
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: 12/16/15
Specifications are subject to change without notice.
littelfuse.com
Axial Lead Reed Switches
Low Power > MDRR-DT
MDRR-DT 14.7mm Miniature Changeover Reed Switch
Product Characteristics
Operating Characteristics
Operate Time
Release Time
Shock
2
2
1
1
0.7ms - max.
1ms - max.
11ms 1∕2 sine wave
50-2000 Hertz
50G - max.
30G - max.
11.0kHz - typ.
Vibration
Resonant Frequency
Magnetic Characteristics
Pull-In Range
3
Ampere Turns
4
10-30
20
L4989
Rating Sensitivity
Test Coil
Ampere Turns
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
25
Part Numbering System
MDRR-DT -15-20 F
Max.
20
Drop-Out (AT, L4989 Coil)
Series
15
Min.
10
5
0
0
5
10
15
20
25
30
35
Pull-In (AT, L4989 Coil)
AT Range
10-15 AT
10-20 AT
15-20 AT
15-25 AT
15-30 AT
20-25 AT
20-30 AT
20-35 AT
25-30 AT
Version
F = FORMED
U = UNFORMED
Example:
15-20 AT product is
MDRR-DT-15-20-F or
MDRR-DT-15-20-U
Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value.
Note: These AT values are the before-modification values of the bare reed switch.
Packaging
Packaging Option
Bulk
Packaging Specification
Bulk
Quantity
1000
Quantity and Packaging Code
N/A
Taping Width
N/A
© 2015 Littelfuse
Revised: 12/16/15
Specifications are subject to change without notice.
littelfuse.com
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