Page 1
Axial Lead Reed Switches
20.19
85) DIA. REF.
Low Power > MDSR-7
MDSR-7 12.7mm Sub-miniature Reed Switch
Description
The MDSR-7 Reed Switch is a sub-miniature, normally open switch with a
12.70mm long x 1.80mm diameter (0.5 00” 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
RoHS
• Available sensitivity range
10-2 5 AT
Agency Approvals
Agency Agency File Number Ampere-Turns Range
E47258
E471070
DEMKO 14 ATEX 1393U 10-25 AT
10-25 AT
Benefits
• 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
Dimensions
Dimensions in mm (inch)
CL OF OVERLAP
13.46
(.530) MIN.
12.70
(.500) MAX.
40.38
(1.590) NOM.
(.795) REF.
1.80
(.071) MAX.
(0.1
0.47
• Reed Relays (par ticularly suited
to ATE type applications)
• Security Systems
Switch Type
Contact Form A (SPST-NO)
Materials
Note: SPST-NO = Single- pole, single-throw, normally open
• Limit Switching
• Office Equipment
Body: Glass
Leads: Tin-plated Ni-Fe wire
Electrical Ratings
Contact Rating
Voltage
Current
Resistance
Capacitance Contact pF - typ. 0.3
Temperature
Notes:
1. Contact rating - Product of the switching voltage and current should never exceed the wa ttage rating. Contact L ittelfuse for additional load/life information.
2. When switching inductive and/or c apacitive loads, the effects of transient volt ages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details.
3. Electrical Load Life Expect ancy - C ontact Lit telfuse with voltage, current values along with t ype of load.
4. Breakdown Voltage - per MIL-STD-202, Method 301.
5. Stor age Temperature - Long time exposure at elevated temp erature may degrade solderability of the leads.
1
3
Switching
Breakdown
3
Switching
2
4
2
Carry
Contact, Initial
Insulation
Operating
Storage
5
W/VA - max. 10
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
°C
°C
200
140
250
0.5
0.35
0.80
0.100
10
-40 to +125
-65 to +125
12
Specifications are subject to change without notice.
littelfuse.com© 2015 Littelfuse Revised: 10/09/15
Page 2
Axial Lead Reed Switches
25
Pull-In (AT, L4989 Coil)
Drop-Out (AT, L4989 Coil)
35
Low Power > MDSR-7
MDSR-7 12.7mm Sub-miniature Reed Switch
Product Characteristics
Operating Characteristics
Operate Time
Release Time
Shock
Vibration
1
1
2
2
11ms 1∕2 sine wave 100G - max.
50-2000 Hertz 30G - max.
0.6ms - max.
0.2ms - max.
Resonant Frequency 5.5kHz - typ.
Magnetic Characteristics
Pull-In Range
Rating Sensitivity
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/N ARM RS-421-A and MIL-STD-2 02.
3. Pull-In Range - Contact Littelfuse for narrower AT ranges available.
4. Rating Sensitivity - The value at which contact r atings and operating charac teris tics are deter mined. Derating may be r equire d below this value.
5. Custom modifications of forming and/or cutting of reed switches are available. Please contact Lit telfuse.
Drop-Out vs. Pull-In Chart
3
4
Ampere Turns 10-25
Ampere Turns 20
Part Numbering System
MDSR-7-10-15
20
Max.
15
Series
AT Range
10
5
0
Note: Chart represents t he range of Drop-Out, min to max for a given Pull- In value.
50
10 15 20 25 30
Min.
Note: T hese AT values are the before-modification values of t he bare reed switch.
10-25 AT
10-15 AT
15-20 AT
20-25 AT
Example:
10-15 AT product is
MDSR-7-10-15
Packaging
Packaging Option Packaging Specification Quantity Quantity & Packaging Code Taping Width
Bulk Bulk 1000 N/A N/A
Specifications are subject to change without notice.
littelfuse.com© 2015 Littelfuse Revised: 10/09/15
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