Page 1
Axial Lead Reed Switches
F - Formed
N.C.
2.54 REF
Low Power > MDRR-DT
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 109 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
RoHS
• Available sensitivity range
10-30 AT
Agency Approvals
Agency Agency File Number Ampere-Turns Range
E47258
E471070
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
• Zero operating power required for
contact closure
• Excellent for switching
microcontroller logic level loads
normally closed contact
DEMKO 14 ATEX 1393U 10-30 AT
Note: Contact Lit telfuse for specific agency approval ratings.
Dimensions
Dimensions in mm (inch)
4.57 REF.
(.180)
CL OF OVERLAP
14.73 MAX.
(.580)
51.66 REF.
(2.034)
52.48 REF.
(2.066)
0.20 (.008) MIN.
0.55 (.022) MAX.
2XØ0.56 REF.
(.022)
. (.100)
U - Unformed
0.80 REF.
(.031)
AT 1.6 FROM SEAL
N.O.
N.C.
1.57 (.062) REF.
N.O.
28.32 REF.
2.54 MAX.
(.100)
(1.115)
Ø0.51 REF.
(.020)
17.78 MIN.
(.700)
COMMON
Applications
• Position Sensing
• Reed Relays
• Industrial Controls
• Office Equipments
• Home Appliances
• Security
Switch Type
Contact Form C (SPDT-CO)
Materials
Note: SPDT-CO = Single- Pole, Double-Throw, Change Over
Body: Glass
Leads: Tin-plated Ni-Fe wire
Electrical Ratings
Contact Rating
Voltage
Current
Resistance
Capacitance Contact pF - typ. 1
Temperature
Notes:
1. Contact rating - Product of the switching voltage and current should never exceed the wa ttage rating. Contact L ittelfuse for additional load/life information.
2. When switching inductive and/or c apacitive loads, the effects of transient volt ages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details.
3. Electrical Load Life Expect ancy - C ontact Lit telfuse with voltage, current values along with t ype of load.
4. Breakdown Voltage - per MIL-STD-202, Method 301.
5. Stor age Temperature - Long time exposure at elevated temp erature may degrade solderability of the leads.
1
3
Switching
Breakdown
3
Switching
2
4
2
Carry
Contact, Initial
Insulation
Operating
Storage
5
W/VA - max. 5
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
°C
°C
175
120
200
0.25
0.18
1.50
0.100
10
-40 to +125
-65 to +125
9
Specifications are subject to change without notice.
littelfuse.com© 2015 Littelfuse Revised: 12/16/15
Page 2
Axial Lead Reed Switches
25
Pull-In (AT, L4989 Coil)
Drop-Out (AT, L4989 Coil)
35
Low Power > MDRR-DT
MDRR-DT 14.7mm Miniature Changeover Reed Switch
Product Characteristics
Operating Characteristics
Operate Time
Release Time
Shock
Vibration
1
1
2
2
11ms 1∕2 sine wave 50G - max.
50-2000 Hertz 30G - max.
0.7ms - max.
1ms - max.
Resonant Frequency 11.0kHz - typ.
Magnetic Characteristics
Pull-In Range
Rating Sensitivity
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/N ARM RS-421-A and MIL-STD-2 02.
3. Pull-In Range - Contact Littelfuse for narrower AT ranges available.
4. Rating Sensitivity - The value at which contact r atings and operating charac teris tics are deter mined. Derating may be r equire d below this value.
5. Custom modifications of forming and/or cutting of reed switches are available. Please contact Lit telfuse.
Drop-Out vs. Pull-In Chart
3
4
Ampere Turns 10-30
Ampere Turns 20
Part Numbering System
MDRR-DT -15-20 F
20
15
10
5
0
Note: Chart represents t he range of Drop-Out, min to max for a given Pull- In value.
50
10 15 20 25 30
Max.
Min.
Series
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
15-20 AT product is
MDRR-DT-15-20-F or
Example:
MDRR-DT-15-20-U
Note: T hese AT values are the before-modification values of t he bare reed switch.
Packaging
Packaging Option Packaging Specification Quantity Quantity and Packaging Code Taping Width
Bulk Bulk 1000 N/A N/A
Specifications are subject to change without notice.
littelfuse.com© 2015 Littelfuse Revised: 12/16/15
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