MDRR-DT(15-20) - LITTELFUSE

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 109 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

109

Capacitance Contact pF - typ. 1

Temperature Operating

Storage 5

°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.

F - Formed

COMMON

N.O.

N.C.

N.O.

N.C.

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)

2.54 REF

. (.100)

1.57 (.062) REF.

0.55 (.022) MAX.

U - Unformed

Note: Contact Littelfuse for specific agency approval ratings.

Speciﬁcations are subject to change without notice.

Drop-Out vs. Pull-In Chart

Packaging

Packaging Option Packaging Specification Quantity Quantity and Packaging Code Taping Width

Bulk Bulk 1000 N/A N/A

Product Characteristics

Operating Characteristics

Operate Time 10.7ms - max.

Release Time 11ms - max.

Shock 211ms 1∕2 sine wave 50G - max.

Vibration 250-2000 Hertz 30G - max.

Resonant Frequency 11.0kHz - typ.

Part Numbering System

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.

Axial Lead Reed Switches

Low Power > MDRR-DT

MDRR-DT 14.7mm Miniature Changeover Reed Switch

MDRR-DT -15-20 F

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

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.

Magnetic Characteristics

Pull-In Range 3Ampere Turns 10-30

Rating Sensitivity 4Ampere Turns 20

Test Coil L4989

Pull-In (AT, L4989 Coil)

Drop-Out (AT, L4989 Coil)

10 15 20 25 30

Max.

Min.