Surface Mount Reed Switches
Low Power > MASM-14
MASM-14 14mm Close-Differential Reed Switch
RoꢀS
Description
The MASM-14 surface mount reed switch is a close-differential, sub-miniature,
normally open switch with a 14mm long x 2.28mm diameter (0.551” x 0.090”)
glass envelope, capable of switching 200Vdc at 10W.
This reed switch is a surface mount version of MACD-14. It has high insulation
resistance of 1010 ohms minimum and a contact resistance of less than 100
milliohms. Both reed switches are intended for use in applications that require
low hysteresis between Pull-In and Drop-Out values.
Features
• Surface mount normally open
switch
• Low close/open hysteresis (close
differential)
Agency Approvals
• Capable of switching 200Vdc or
0.5A at up to 10W
Agency
Agency File Number
Ampere-Turns Range
E47258
E471070
10-30 AT
Benefits
• Zero operating power required for
contact closure
• Excellent for switching micro-
controller logic level loads
• Hermetically sealed switch
contacts are not affected by and
have no effect on their external
environment
Note: Contact Littelfuse for specific agency approval ratings.
Dimensions
Dimensions in mm (inch)
Applications
• Position Sensing
• Level Sensing
• Security
Ø2.28 MAX
2x1.14 0.10
(.090)
(.045 .004)
• Industrial Controls
• Office Equipment
• Home Appliances
17.52 0.25
(.690 .010)
RECOMMENDED LAND PATTERN
14.00 MAX
(.551)
2x3.05 (.120)
2x1.65 (.065)
Switch Type
2.84 MAX
(.112)
14.60
(.575)
19.30 0.25
(.760 .010)
2x0.00 MIN
(.000)
Contact Form
A (SPST-NO)
Note: Land pattern is Littelfuse recommendation only. User is responsible for proper PCB design.
Body: Glass
Leads: Tin-plated Ni-Fe wire
Materials
Note: SPST-NO = Single-pole, single-throw, normally open
Electrical Ratings
Contact Rating 1
W/VA - max.
10
Switching 2
Vdc - max.
Vac - max.
Vdc - min.
200
140
200
Voltage 3
Breakdown 4
Switching 2
Adc - max.
Aac - max.
Adc - max.
0.50
0.35
1.00
Current 3
Carry
Contact, Initial
Insulation
Ω - max.
Ω - min.
0.100
1010
Resistance
Capacitance
Temperature
Contact
pF - typ.
0.3
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.
© 2020 Littelfuse
Revised: BO.12/07/20
littelfuse.com
Specifications are subject to change without notice.