Surface Mount Reed Switches
Low Power > MISM-7
MISM-7 7mm Surface Mount Reed Switch
RoHS
Description
The MISM-7 surface mount reed switch is a sub-miniature, normally open switch
with a 7mm long x 1.8mm diameter (0.276 x 0.071) glass envelope, capable of
switching up to 0.25 Amps.
This reed switch is a surface mount version of the MITI-7. It has a high insulation
12
resistance of 10 Ohms minimum and a contact resistance of less than 100
milliohms.
Features
Ultra-miniature surface mount Capable of switching 170 Vdc or
normally open switch 0.25A up to 10W
Available sensitivity range 6-10 AT
Agency Approvals
Agency Agency File Number Ampere-Turns Range
Benefits
Excellent for switching
Hermetically sealed switch
E47258
6 - 20AT microcontroller logic level loads
contacts are not effected by and
E471070
Very low space requirement
have no effect on their external
environment
DEMKO 14 ATEX 1393U 6 - 20 AT
Zero operating power required
for contact closure
Dimensions
Applications
Dimensions in mm
Position Sensing Security
1.80 MAX
2x0.840.10
(.071)
Level Sensing Office Equipment
(.033004)
Meter Equipment
7.00 MAX RECOMMENDED LAND PATTERN
2x1.12 (044)
(.276)
Switch Type
2x3.25 (.128)
2.28 MAX
(.090)
Contact Form A (SPST-NO)
8.61
0.02 MIN
(.339)
(.001)
Body: Glass
Materials
9.910.25
Leads: Tin-plated Ni-Fe wire
(.390010)
Note: Land pattern is Littelfuse recommendation
13.720.25
Note: SPST-NO = Single-pole, single-throw, normally open
only. User is responsible for proper PCB design.
(.540010)
Electrical Ratings
1
Contact Rating W/VA - max. 10
2
Switching Vdc - max. 170
3
Voltage Vac - max. 120
4
Breakdown Vdc - min. 175
2
Switching Adc - max. 0.25
3
Current Aac - max. 0.18
Carry Adc - max. 0.50
Contact, Initial - max. 0.150
Resistance
12
Insulation - min. 10
Capacitance Contact pF - typ. 0.3
Operating C -40 to +125
Temperature
5
C -65 to +125
Storage
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: 11/02/15 littelfuse.com
Specifications are subject to change without notice.Surface Mount Reed Switches
Low Power > MISM-7
MISM-7 7mm Surface Mount Reed Switch
Product Characteristics
Operating Characteristics
1
Operate Time 0.45ms - max.
1
Release Time 0.20ms - max.
2
Shock 11ms 12 sine wave 150G - max.
2
Vibration 50-2000 Hertz 30G - max.
Resonant Frequency 10.0kHz - typ.
Magnetic Characteristics
3
Pull-In Range Ampere Turns 6-10, 10-15, 15-20
4
Rating Sensitivity Ampere Turns 10
Test Coil L4991
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. These AT values are the before modification AT of the MITI-3V1.
4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value.
Drop-Out vs. Pull In Chart Part Numbering System
20
Max.
MISM-7 R - 6-10
17.5
15
Min.
Series
12.5
Packaging
10
R = Tape and Reel
B = Bulk
7.5
AT Range
6-10 AT Example:
5
10-15 AT 6-10 AT product is
15-20 AT MISM-7R-6-10
2.5
Note: These AT values are the before-modification values of the bare reed switch.
0
02.5 57.5 10 12.5 15 17.5 20
Pull-In (AT, L4991 Coil)
Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value.
Packaging
Packaging Option Packaging Specification Quantity Quantity and Packaging Code Taping Width
Tape and Reel EIA-RS-481-1 3000 R 32mm
2015 Littelfuse Revised: 11/02/15 littelfuse.com
Specifications are subject to change without notice.
Drop-Out (AT, L4991 Coil)