Reed Switches Datasheet
MDSM-10
10.2mm Sub-miniature Surface Mount
RoHS
Description
The MDSM-10 Reed Switch is a sub-miniature, surface mounting,
normally open switch with a 10.16mm long x 1.80mm diameter
(0.400” x 0.071”) glass envelope, capable of switching 200Vdc at
10W.
This reed switch is a surface mount version of the MDSR-10. It
has high insulation resistance of 10¹² ohms minimum and low
contact resistance of less than 120milli-ohms.
Features & Benefits
■ Surface mounting normally
and have no effect on their
external environment
open switch
■ Capable of switching 200Vdc
■ Low space requirement
or 0.5A at up to 10W
■ Zero operating power
■ Low, stable contact
required for contact closure
resistance
Agency Approvals
■ Excellent for switching
microcontroller logic level
loads
■ Available sensitivity 10-25 AT
Agency
Agency File Number
Ampere-Turns Range
■ Hermetically sealed switch
contacts are not affected by
E47258
E471070
10-25 AT
Note: Contact Littelfuse for specific agency approval ratings.
Applications
Dimensions
■ Position Sensing
■ Security
■ Metering
Dimensions in mm (inch)
■ Level Sensing
Ø1.8±
(.±71) MAX
1.±±±±.1±
(.±45 +/-.±±4) TYP
SwitchType
12.45±±.25
(.49±±.±1±)
Contact Form
Materials
1±.16
A (SPST-NO)
(.4±±)MAX
2.±± MAX
(.±78)
Body: Glass
Leads: Tin-plated Ni-Fe wire
15.62±±.1±
(.615±.±1±)
Note: SPST-NO = Single-pole, single-throw, normally open
2x±.±± MIN
(.±±±)
RECOMMENDED LAND PATTERN
1.3± (.±51) TYP.
2.9± (.114) TYP.
11.2±
(.441)
Note: Land pattern is Littelfuse recommendation only. User is responsible for proper PCB design.
Electrical Ratings
Contact Rating 1
Voltage 3
W/VA - max.
10
Switching 2
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
200
140
250
0.50
0.35
1.00
Breakdown 4
Switching 2
Current 3
Carry
Ω - max.
Ω - min.
0.12
Resistance
Contact, Initial Insulation
1012
Capacitance
Temperature
Contact
pF - typ.
0.2
Operating
°C
°C
-40 to +125
-65 to +125
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.
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
1
Revised: GD. 08/26/21