MDSM-DTB 15/20 - LITTELFUSE

Speciﬁcations are subject to change without notice.

MDSM-DT 14.7mm Surface Mount Changeover Reed Switch

Description

The MDSM-DT Reed Switch is a miniature, surface mounting, changeover switch

with a 14.73mm long x 2.54mm diameter (0.580” x 0.100”) glass envelope. It is

capable of switching 175Vdc at 5W. The MDSM-DT has an insulation resistance

of 109 ohms minimum and contact resistance less than 100 milli-ohms. This reed

switch is a surface mount version of the MDRR-DT.

Agency Approvals

Agency Agency File Number Ampere-Turns Range

E47258

E471070 15-30 AT

DEMKO 14 ATEX 1393U 15-30 AT

Switch Type

Contact Form C (SPDT-CO)

Materials Body: Glass

Leads: Tin-plated Ni-Fe wire

Surface Mount Reed Switches

Features

• Surface mount SPDT

changeover switch

• Capable of switching 175Vdc or

0.25A at up to 5W

• Available sensitivity 15-30 AT

Benefits

• Hermetically sealed switch

contacts are not affected by and

have no effect on their external

environment

• Zero operating power required for

contact closure

• Excellent for switching

microcontroller logic level loads

Applications

• Position Sensing

• Level Sensing

• Industrial Controls

• Office Equipments

• Mobile Phones

Dimensions

Dimensions in mm (inch)

Low Power > MDSM-DT

RoHS

Note: SPDT-CO = Single-Pole, Double-Throw, Change-Over

Note: Land pattern is Littelfuse recommendation only. User is responsible for proper PCB design.

Electrical Ratings

Contact Rating 1W/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. 1.0

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.

(1.000±.010)

25.40±0.25

20.32±0.25

(.800±.010)

(.420±.020)

10.67±0.51

2.54±0.38

Ø0.56

(.022)

N.C.

Ø0.56

(.022)

(.100±.015)

N.O.

14.73

CL OF OVERLAP

(.580)MAX

(.063)TYP

(.020)

0.51

2.87

(.037)

0.94

1.60

RECOMMENDED LAND PATTERN

(.020)

Ø0.51

19.30

PYT)831.(

)067.(

3.50

(.113)MAX

(.001)MIN

0.025

(.100)MAX

Ø2.54 LEAD

COMMON

(1.000±.010)

25.40±0.25

20.32±0.25

(.800±.010)

(.420±.020)

10.67±0.51

2.54±0.38

Ø0.56

(.022)

N.C.

Ø0.56

(.022)

(.100±.015)

N.O.

14.73

CL OF OVERLAP

(.580)MAX

(.063)TYP

(.020)

0.51

2.87

(.037)

0.94

1.60

RECOMMENDED LAND PATTERN

(.020)

Ø0.51

19.30

PYT)831.(

)067.(

3.50

(.113)MAX

(.001)MIN

0.025

(.100)MAX

Ø2.54 LEAD

COMMON

Speciﬁcations are subject to change without notice.

MDSM-DTR - 15-20

Series

AT Range

15-30 AT

15-20 AT

20-25 AT

25-30 AT

Example:

15-20 AT product in Bulk

packaging is MDSM-DTB-15-20

Packaging

R = Tape and Reel

B = Bulk

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

Drop-Out vs. Pull-In Chart

Packaging

Packaging Option Packaging Specification Quantity Quantity and Packaging Code Taping Width

Tape and Reel EIA-RS-481-1 3000 R 32mm

Bulk N/A 200 B N/A

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. These AT values are the before modification AT of the MDRR-DT.

4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value.

Surface Mount Reed Switches

Low Power > MDSM-DT

MDSM-DT 14.7mm Surface Mount Changeover Reed Switch

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

the MDRR-DT prior to modification into the MDSM-DT.

Product Characteristics

Operating Characteristics

Operate Time 10.7ms - max.

Release Time 11.0ms - max.

Shock 211ms 1∕2 sine wave 50G - max.

Vibration 250-2000 Hertz 30G - max.

Resonant Frequency 11.0kHz - typ.

Magnetic Characteristics

Pull-In Range 3Ampere Turns 15-30

Rating Sensitivity 4Ampere Turns 20

Test Coil L4989

Additional Information

Datasheet Samples

Resources

Pull-In (AT, L4989 Coil)

Drop-Out (AT, L4989 Coil)

10 15 20 25 30

Max.

Min.

Speciﬁcations are subject to change without notice.

TAPE DIMENSIONS mm (inch)

REEL DIMENSIONS mm (inch)

MDSM-DT 14.7mm Surface Mount Changeover Reed Switch

Surface Mount Reed Switches

Low Power > MDSM-DT

(.138)

3,50

(.240)

6,10

(.079)

(.157)

4,00

2,00

+.004

059 )

-0

+0,10

1,50

067 )

-.002

+.006

+0,15

-0,05

1,70

2,70

(.106)

6,10

(.240)

3.0°

Ø2,00

(.079)

1,00

(.039)

(.129)

3,28

8,00

(.315)

20,20

(.795)

(.069)

1,75

40,40

(1.591)

+.004

(.059 )

Ø1,50+0.10

-0

3. ALL DIMENSIONS ARE TO INSIDE OF POCKET

2. ALL POCKET DIMENSIONS ARE ±(.004")

0,10mm

ARE PER FIA-481 UNLESS NOTED

1. ALL TAPE & SPROCKET HOLE DIMENSIONS

(.014)

0,36

3,00

(.118)

(1.732)

44,00

3.0°

5,63

(.222)

(.118)

3,00

26,00

(1.024)

120° TYP.

(.075±.016)

1,9±0.4 TYP.

(.512±.008)

Ø13,0±0.2

Ø21,0±

0.4

(.827±

.016)

100,0±0,5

MEASURED AT HUB

+.008

(44,4 )

(1.748 )

+0.2

50,4 MAX.

(3.937±.020)

-0

(1.984)

330,00

(12.992

)

-0,76

-.030

+.010

+0,2