Surface Mount Reed Switches
Low Power > MDSM-4
MDSM-4 15.3mm Surface Mount Reed Switch
RoHS
Description
The MDSM-4 surface mount reed switch is a sub-miniature, normally open
switch with a 15.24mm long x 2.28mm diameter (0.600” x 0.090”) glass
envelope, capable of switching 200Vdc at 10W.
This reed switch is a surface mount version of MDCG-4. It has high insulation
resistance of 10
10
ohms minimum and a contact resistance of less than
100 milliohms.
Features
Agency Approvals
Agency
Agency File Number
E47258
E471070
DEMKO 14 ATEX 1393U
• Surface mount, normally
open switch
• Low, stable contact resistance
• Capable of switching 200Vdc or
0.5A at up to 10W
• Available sensitivity 12-38 AT
Ampere-Turns Range
12-38 AT
12-38 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 micro-
controller logic level loads
Dimensions
Dimensions in mm (inch)
Ø2.28
(.090)MAX
1.00±0.10
(.039±.004)
Applications
• Position Sensing
• Level sensing
• Industrial Controls
• Security
• Limit Switching
• Office Equipment
17.52±0.25
(.690±.010)
15.24
(.600)MAX
2.84 MAX
(.112)
19.30±0.25
(.760±.010)
Switch Type
Contact Form
A (SPST-NO)
Body: Glass
Leads: Tin-plated Ni-Fe wire
2x0.00 MIN
(.000)
RECOMMENDED LAND PATTERN
2x1.30 (.051)
2x2.34 (.092)
16.00
(.630)
Materials
Note: SPST-NO = Single-pole, single-throw, normally open
Note: Land pattern is Littelfuse recommendation only. User is responsible for proper PCB design.
Electrical Ratings
Contact Rating
Voltage
Current
3
1
Switching
2
3
Breakdown
4
Switching
2
Carry
Contact, Initial
Insulation
Contact
Operating
Storage
5
Resistance
Capacitance
Temperature
W/VA - max.
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
pF - typ.
°C
°C
10
200
140
250
0.50
0.35
1.20
0.100
10
10
0.2
-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-4
MDSM-4 15.3mm Surface Mount Reed Switch
Product Characteristics
Operating Characteristics
Operate Time
Release Time
Shock
2
2
1
1
0.6ms - max.
0.2ms - max.
11ms 1∕2 sine wave
50-2000 Hertz
100G - max.
30G - max.
3.9kHz - typ.
Vibration
Resonant Frequency
Magnetic Characteristics
Pull-In Range
Test Coil
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 MDCG-4.
4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value.
3
4
Ampere Turns
Ampere Turns
12-38
20
L4989
Rating Sensitivity
Drop-Out vs. Pull-In Chart
30
Part Numbering System
MDSM-4 R - 17-23
Max.
25
Drop-Out (AT, L4989 Coil)
Series
Packaging
R = Tape and Reel
B = Bulk
AT Range
12-18 AT
12-23 AT
17-23 AT
17-28 AT
22-28 AT
22-33 AT
27-33 AT
27-38 AT
32-38 AT
Example:
17-23 AT product in Bulk
packaging is MDSM-4B-17-23
20
15
Min.
10
5
0
0
5
10
15
20
25
30
35
40
Pull-In (AT, L4989 Coil)
Note: Chart represents the range of Drop-Out, min to max, for a given Pull-In value of
the MDCG-4 prior to modification into the MDSM-4.
Note: These AT values are the before-modification values of the bare reed switch.
Additional Information
Datasheet
Resources
Samples
Packaging
Packaging Option
Tape and Reel
Bulk
Packaging Specification
EIA-RS-481-1
N/A
Quantity
3000
200
Quantity and Packaging Code
R
B
Taping Width
32mm
N/A
© 2015 Littelfuse
Specifications are subject to change without notice.
littelfuse.com
Surface Mount Reed Switches
Low Power > MDSM-4
MDSM-4 15.3mm Surface Mount Reed Switch
TAPE DIMENSIONS mm (inch)
(.079)
2,00
(.157)
4,00
(.315)
8,00
(.059
+.004
)
-0
Ø1,50
+0,10
-0
(.069)
1,75
7.5°
(.240)
6,10
(.559)
14,20
(1.118)
28,40
(.079)
Ø2,00
(1.260)
32,00
(.670)
17,02
(.830)
21,08
(.067
+.006
)
-.002
Ø1,70
+0,15
-0,05
(.059
+.004
)
-0
Ø1,50
+0,10
-0
7.5°
(.240)
6,10
3.0°
(.016)
0,41
(.075)
1,90
(.046)
1,17
(.111)
2,82
(.084)
2,13
1. ALL TAPE & SPROCKET HOLE DIMENSIONS
ARE PER EIA-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±0,50
(12.992
-.030
)
330,00
+0,25
-0,76
+.010
(.075±.016)
1,9±0.4 TYP.
(1.512)
38,4 MAX.
6)
.01
7± 0.4
82 1,0±
(. 2
Ø
YP
.
12
0
MEASURED AT HUB
(.512±.008)
Ø13,0±0.2
(1.276
+.008
)
-0
(32,4
+0.2
)
-0
© 2015 Littelfuse
Specifications are subject to change without notice.
°T
littelfuse.com
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