Surface Mount Reed Switches
Low Power > MDSM-DT
MDSM-DT 14.7mm Surface Mount Changeover Reed Switch
RoHS
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 10 9 ohms minimum and contact resistance less than 100 milli-ohms. This reed
switch is a surface mount version of the MDRR-DT.
Features
• Surface mount SPDT
changeover switch
• Capable of switching 175Vdc or
0.25A at up to 5W
Agency Approvals
Agency
Benefits
Agency File Number
Ampere-Turns Range
E47258
E471070
15-30 AT
DEMKO 14 ATEX 1393U
15-30 AT
• Hermetically sealed switch
contacts are not affected by and
have no effect on their external
environment
Applications
2.54±0.38
(.100±.015)
• Position
Sensing
Ø0.56
• Level
SensingN.O.
(.022)
• Industrial Controls
Dimensions
Dimensions in mm (inch)
2.54±0.38
(.100±.015)
Ø0.56
(.022)
N.O.
14.73
(.580)MAX
Ø2.54
(.100)MAX
CL OF OVERLAP
0.025
(.001)MIN
20.32±0.25
(.800±.010)
25.40±0.25
(1.000±.010)
RECOMMENDED LAND PATTERN
Electrical Ratings
Voltage
3
Current
3
10.67±0.51
(.420±.020)
Switch Type
Ø0.56
(.022)
COMMON
LEAD
Ø0.51
(.020)
COMMON
LEAD
CL OF OVERLAP
Ø0.51
(.020)
19.30
(.760)
1
0.51
0.94 (.020)
(.037)
20.32±0.25
Leads: Tin-plated
(.800±.010)
25.40±0.25Change-Over
Note: SPDT-CO = Single-Pole, Double-Throw,
(1.000±.010)
RECOMMENDED LAND PATTERN
19.30
(.760)
3.50
(.138)TYP
Switching
2
Breakdown 4
Switching 2
Carry
Resistance
Contact, Initial Insulation
Capacitance
Contact
Operating
Storage 5
Temperature
0.025
(.001)MIN
Body: Glass
2.87
(.113)MAX
1.60
(.063)TYP
C (SPDT-CO)
Materials
Note: Land pattern is Littelfuse recommendation only. User is responsible for proper PCB design.
Contact Rating
• Office Equipments
Ø2.54
Mobile (.100)MAX
Phones
14.73
•
(.580)MAX
Contact Form
10.67±0.51
(.420±.020)
• Zero operating power required for
contact closure
• Excellent for switching
microcontroller logic level loads
N.C.
N.C.
Ø0.56
(.022)
• Available sensitivity 15-30 AT
0.51
0.94 (.020)
(.037)
W/VA - max.
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
pF - typ.
°C
°C
2.87
Ni-Fe(.113)MAX
wire
3.50
(.138)TYP
1.60
(.063)TYP
5
175
120
200
0.25
0.18
1.50
0.100
109
1.0
-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.
© 2015 Littelfuse
Specifications are subject to change without notice.
littelfuse.com
Surface Mount Reed Switches
Low Power > MDSM-DT
MDSM-DT 14.7mm Surface Mount Changeover Reed Switch
Product Characteristics
Operating Characteristics
Operate Time
1
Release Time
1
Shock
0.7ms - max.
1.0ms - max.
11ms 1∕2 sine wave
2
Vibration
50G - max.
50-2000 Hertz
2
30G - max.
Resonant Frequency
11.0kHz - typ.
Magnetic Characteristics
Pull-In Range
3
Rating Sensitivity
4
Ampere Turns
15-30
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. 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.
Drop-Out vs. Pull-In Chart
Part Numbering System
25
MDSM-DTR - 15-20
Drop-Out (AT, L4989 Coil)
20
Max.
15
Series
Packaging
R = Tape and Reel
B = Bulk
Min.
AT Range
15-30 AT
15-20 AT
20-25 AT
25-30 AT
10
5
Example:
15-20 AT product in Bulk
packaging is MDSM-DTB-15-20
Note: These AT values are the before-modification values of the bare reed switch.
0
0
5
10
15
20
25
30
35
Pull-In (AT, L4989 Coil)
Additional Information
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.
Datasheet
Resources
Samples
Packaging
Packaging Option
Tape and Reel
Packaging Specification
Quantity
Quantity and Packaging Code
Taping Width
EIA-RS-481-1
3000
R
32mm
N/A
200
B
N/A
Bulk
© 2015 Littelfuse
Specifications are subject to change without notice.
littelfuse.com
Surface Mount Reed Switches
Low Power > MDSM-DT
MDSM-DT 14.7mm Surface Mount Changeover Reed Switch
TAPE DIMENSIONS mm (inch)
(.059
(.315)
8,00
+.004
-0 )
+0.10
-0
Ø1,50
(.079)
2,00
(.069)
1,75
(.157)
4,00
3.0°
(.240)
6,10
(.118)
3,00
(.222)
5,63
(.795)
20,20
(1.591)
40,40
(1.732)
44,00
(1.024)
26,00
(.079)
Ø2,00
+.006
(.067 -.002 )
1,70+0,15
-0,05
(.118)
3,00
(.059
(.240)
6,10
+.004
-0 )
1,50 +0,10
-0
(.138)
3,50
(.014)
0,36
3.0°
(.106)
2,70
(.039)
1,00
(.129)
3,28
1. ALL TAPE & SPROCKET HOLE DIMENSIONS
ARE PER FIA-481 UNLESS NOTED
2. ALL POCKET DIMENSIONS ARE ±(.004") 0,10mm
3. ALL DIMENSIONS ARE TO INSIDE OF POCKET
REEL DIMENSIONS mm (inch)
(3.937±.020)
100,0±0,5
-0,76
(1.984)
50,4 MAX.
)
16
±.0 4
27 ±0.
( .8 21,0
Ø
12
0
°T
YP
.
(.075±.016)
1,9±0.4 TYP.
+.010
(12.992-.030 )
330,00 +0,25
(1.748+.008
)
-0
(44,4 +0.2
)
-0
MEASURED AT HUB
(.512±.008)
Ø13,0±0.2
© 2015 Littelfuse
Specifications are subject to change without notice.
littelfuse.com