Littelfuse MDSR-7 Mdsr-7 12.7mm sub-miniature reed switch Datasheet

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
Agency Approvals
Agency
• Available sensitivity range
10-25 AT
Benefits
Agency File Number
Ampere-Turns Range
E47258
E471070
10-25 AT
DEMKO 14 ATEX 1393U
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 microcontroller logic level loads
Applications
• Reed Relays (particularly suited
to ATE type applications)
• Security Systems
Dimensions
Dimensions in mm (inch)
20.19
(.795) REF.
CL OF OVERLAP
13.46
(.530) MIN.
1.80
(.071) MAX.
0.47
(0.185) DIA. REF.
12.70
(.500) MAX.
40.38
(1.590) NOM.
• Limit Switching
• Office Equipment
Switch Type
Contact Form
A (SPST-NO)
Materials
Body: Glass
Leads: Tin-plated Ni-Fe wire
Note: SPST-NO = Single-pole, single-throw, normally open
Electrical Ratings
Contact Rating
W/VA - max.
10
Vdc - max.
Vac - max.
Vdc - min.
200
140
250
Carry
Adc - max.
Aac - max.
Adc - max.
0.5
0.35
0.80
Resistance
Contact, Initial
Insulation
Ω - max.
Ω - min.
0.100
1012
Capacitance
Contact
pF - typ.
0.3
Temperature
Operating
Storage 5
°C
°C
-40 to +125
-65 to +125
1
Switching
Voltage
2
3
Breakdown
Switching
Current
4
2
3
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
1
0.6ms - max.
Release Time
1
0.2ms - max.
Shock
2
Vibration
11ms 1∕2 sine wave
100G - max.
50-2000 Hertz
30G - max.
2
Resonant Frequency
5.5kHz - typ.
Magnetic Characteristics
Pull-In Range
3
Rating Sensitivity
4
Ampere Turns
10-25
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.
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
Part Numbering System
25
MDSR-7-10-15
Drop-Out (AT, L4989 Coil)
20
Max.
Series
15
AT Range
10-25 AT
10-15 AT
15-20 AT
20-25 AT
Min.
10
5
Example:
10-15 AT product is
MDSR-7-10-15
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
Packaging Specification
Bulk
© 2015 Littelfuse
Revised: 10/09/15
Specifications are subject to change without notice.
Bulk
Quantity
1000
Quantity & Packaging Code
N/A
Taping Width
N/A
littelfuse.com
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