Axial Lead Reed Switches
Low Power > MDSR-7
MDSR-7 12.7mm Sub-miniature Reed Switch
RoHS
Description
The MDSR-7 Reed Switch is a sub-miniature, normally open switch with a
12.70mm long x 1.80mm diameter (0.500” x 0.071”) glass envelope, capable of
switching 200Vdc at 10W. It has high insulation resistance of 10¹² ohms
minimum and low contact resistance of less than 100 milli-ohms.
Features
• Sub-miniature normally open
switch
• Capable of switching 200V or 0.5A
at up to 10W
• Available sensitivity range
10-25 AT
Agency Approvals
Agency
Agency File Number
E47258
E471070
DEMKO 14 ATEX 1393U
Benefits
Ampere-Turns Range
10-25 AT
10-25 AT
• Hermetically sealed switch
contacts are not affected by and
have no effect on their external
environment
• Low, stable contact resistance
• Zero operating power required
for contact
• Excellent for switching micro-
controller logic level loads
Applications
Dimensions
Dimensions in mm (inch)
20.19
(.795) REF
.
CL OF OVERLAP
1.80
(.071) MAX.
0.47
(0.185) DIA. REF
.
• Reed Relays (particularly suited
to ATE type applications)
• Security Systems
• Limit Switching
• Office Equipment
Switch Type
Contact Form
A (SPST-NO)
Body: Glass
Leads: Tin-plated Ni-Fe wire
13.46
(.530) MIN.
12.70
(.500) MAX.
40.38
(1.590) NOM.
Materials
Note: SPST-NO = Single-pole, single-throw, normally open
Electrical Ratings
Contact Rating
Voltage
3
1
W/VA - max.
Switching
2
10
200
140
250
0.5
0.35
0.80
0.100
10
12
0.3
-40 to +125
-65 to +125
Breakdown
Switching
Current
3
2
4
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
pF - typ.
°C
°C
Carry
Resistance
Capacitance
Temperature
Contact, Initial
Insulation
Contact
Operating
Storage
5
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
Revised: 10/09/15
Specifications are subject to change without notice.
littelfuse.com
Axial Lead Reed Switches
Low Power > MDSR-7
MDSR-7 12.7mm Sub-miniature 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.
5.5kHz - typ.
Vibration
Resonant Frequency
Magnetic Characteristics
Pull-In Range
3
Ampere Turns
4
10-25
20
L4989
Rating Sensitivity
Test Coil
Ampere Turns
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
25
Part Numbering System
MDSR-7-10-15
Max.
20
Drop-Out (AT, L4989 Coil)
15
Series
Min.
10
AT Range
10-25 AT
10-15 AT
15-20 AT
20-25 AT
Example:
10-15 AT product is
MDSR-7-10-15
5
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)
Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value.
Packaging
Packaging Option
Bulk
Packaging Specification
Bulk
Quantity
1000
Quantity & Packaging Code
N/A
Taping Width
N/A
© 2015 Littelfuse
Revised: 10/09/15
Specifications are subject to change without notice.
littelfuse.com
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