Axial Lead Reed Switches
Low Power > MDRR-DT

MDRR-DT 14.7mm Miniature Changeover Reed Switch
RoHSDescription
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 mountversion, that is, MDSM-DT.

Features• Miniature SPDT changeover switch• Capable of switching 175Vdc or0.25A at up to 5WBenefits

Agency Approvals
AgencyAgency File Number

Ampere-Turns Range

E47258E471070

10-30 AT

Note: Contact Littelfuse for specific agency approval ratings.

• Zero operating power required forcontact closure• Excellent for switching
microcontroller logic level loads

F - Formed

CL OF OVERLAP

0.20 (.008) MIN.
AT 1.6 FROM SEAL
0.55 (.022) MAX.
2XØ0.56 REF.
(.022)
N.O.

28.32 REF.
(1.115)
2.54 MAX.
(.100)

4.57 REF.
(.180)

Ø0.51 REF.
(.020)COMMON

N.C.
1.57 (.062) REF.

14.73 MAX.
(.580)

17.78 MIN.
(.700)

51.66 REF.
(2.034)

U - Unformed• Office Equipments• Home Appliances• Security• Position Sensing• Reed Relays• Industrial Controls

Dimensions in mm (inch)

0.80 REF.
(.031)• Hermetically sealed switch
contacts are not affected by andhave no effect on their externalenvironment• Can be used as changeover or
normally closed contact

Applications

Dimensions

2.54 REF. (.100)• Available sensitivity range
10-30 AT

Switch TypeContact Form

C (SPDT-CO)

Materials

Body: Glass
Leads: Tin-plated Ni-Fe wire

Note: SPDT-CO = Single-Pole, Double-Throw, Change Over52.48 REF.
(2.066)
N.O.
N.C.

Electrical Ratings
Contact Rating 1

W/VA - max.

5

Vdc - max.
Vac - max.
Vdc - min.

175
120200Carry

Adc - max.
Aac - max.
Adc - max.

0.25
0.18
1.50

ResistanceContact, Initial
Insulation

Ω - max.
Ω - min.

0.100
109

CapacitanceContactpF - typ.

1

Temperature

OperatingStorage 5°C°C-40 to +125
-65 to +125

Switching 2
Voltage 3
Breakdown 4
Switching 2
Current 3

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.

© 2020 Littelfuse
Revised: BO.12/08/20Specifications 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 1

0.7ms - max.

Release Time 1

1ms - max.

Shock 2

11ms 1∕2 sine wave

50G - max.

Vibration 2

50-2000 Hertz

30G - max.

Resonant Frequency

11.0kHz - typ.

Magnetic Characteristics
Pull-In Range 3

Ampere Turns

10-30

Rating Sensitivity 4

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

25

MDRR-DT -15-20 F

Drop-Out (AT, L4989 Coil)

20Max.

Series15Min.

1050051015202530

35

Pull-In (AT, L4989 Coil)

Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value.

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
VersionF = FORMED
U = UNFORMED

Example:15-20 AT product is
MDRR-DT-15-20-F or
MDRR-DT-15-20-U

Note: These AT values are the before-modification values of the bare reed switch.

Packaging
Packaging Option

Packaging Specification

Quantity

Quantity and Packaging CodeTaping Width

Bulk

Bulk

1000

N/A

N/A

© 2020 Littelfuse
Revised: BO.12/08/20
Specifications are subject to change without notice.

littelfuse.com