littelfuse.com© 2015 Littelfuse Revised: 10/09/15
Specifications are subject to change without notice.
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 (0.500” 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.
Agency Approvals
Agency Agency File Number Ampere-Turns Range
E47258
E471070
10-25 AT
DEMKO 14 ATEX 1393U 10-25 AT
Switch Type
Contact Form A (SPST-NO)
Materials
Body: Glass
Leads: Tin-plated Ni-Fe wire
Axial Lead Reed Switches
Features
• Sub-miniature normally open
switch
• Capable of switching 200V or 0.5A
at up to 10W
• Available sensitivity range
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 micro-
controller logic level loads
Applications
• Reed Relays (particularly suited
to ATE type applications)
• Security Systems
• Limit Switching
• Office Equipment
Dimensions
Dimensions in mm (inch)
Low Power > MDSR-7
RoHS
Note: SPST-NO = Single-pole, single-throw, normally open
Electrical Ratings
Contact Rating
1
W/VA - max. 10
Voltage
3
Switching
2
Breakdown
4
Vdc - max.
Vac - max.
Vdc - min.
200
140
250
Current
3
Switching
2
Carry
Adc - max.
Aac - max.
Adc - max.
0.5
0.35
0.80
Resistance
Contact, Initial
Insulation
Ω - max.
Ω - min.
0.100
10
12
Capacitance Contact pF - typ. 0.3
Temperature
Operating
Storage
5
°C
°C
-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.
CL OF OVERLAP
(.795) REF.
13.46
(.530) MIN.
12.70
(.500) MAX.
40.38
(1.590) NOM.
1.80
(.071) MAX.
0.47
(0.1
