Axial Lead Reed Switches
Low Power > MACD-14
MACD-14 14mm Close-Differential Reed Switch
RoHS
Description
The MACD-14 reed switch is a close-differential, sub-miniature, normally open
switch with a 14.00mm long x 2.28mm diameter (0.551” x 0.090”) glass
envelope, capable of switching 200Vdc at 10W.
This reed switch is also available in a surface mount version, that is, MASM-14.
It has a high insulation resistance of 10
10
ohms minimum and contact resistance
less than 100 milli-ohms. Both reed switches are intended for use in applications
that require low hysteresis between Pull-In and Drop-Out values.
Features
Agency Approvals
Agency
Agency File Number
E47258
E471070
DEMKO 14 ATEX 1393U
Note: Contact Littelfuse for specific agency approval ratings.
Ampere-Turns Range
10-30 AT
10-30 AT
• Low close/open hysteresis (close
differential)
• Normally open switch
• Capable of switching
200Vdc or 0.5A at up to 10W
Benefits
• Hermetically sealed switch
contacts are not affected by and
have no effect on their external
environment
• Zero operating power required for
contact closure
• Excellent for switching micro-
controller logic level loads
Dimensions
Dimensions in mm (inch)
CL OF OVERLAP
22.15
(.872) REF
.
2.28
(.090) MAX.
Applications
• Position Sensing
• Level Sensing
• Security
• Industrial Controls
• Office Equipment
• Home Appliances
0.51
(.020) DIA. REF
.
Switch Type
Contact Form
Materials
A (SPST-NO)
Body: Glass
Leads: Tin-plated Ni-Fe wire
14.80
(.583) MIN.
14.00
(.551) MAX.
44.30
(1.744) NOM.
Note: SPST-NO = Single-pole, single-throw, normally open
Electrical Ratings
Contact Rating
Voltage
3
1
W/VA - max.
Switching
2
10
200
140
200
0.50
0.35
1.00
0.100
10
10
0.3
-40 to +125
-65 to +125
Breakdown
3
4
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
pF - typ.
°C
°C
Current
Switching
2
Resistance
Capacitance
Temperature
Carry
Contact, Initial
Insulation
Contact
Operating
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 and 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.
© 2017 Littelfuse
Revised: 02/08/17
Specifications are subject to change without notice.
littelfuse.com
Axial Lead Reed Switches
Low Power > MACD-14
MACD-14 14mm Close-Differential Reed Switch
Product Characteristics
Operating Characteristics
Operate Time
Release Time
Shock
2
2
1
1
0.6ms - max.
0.20ms - max.
11ms 1∕2 sine wave
50-2000 Hertz
100G - max.
30G - max.
5.3kHz - typ.
Vibration
Resonant Frequency
Magnetic Characteristics
Pull-In Range
3
Ampere Turns
4
10-30
20
L4989
Rating Sensitivity
Test Coil
Ampere Turns
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.
4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value.
5. Custom modifications of forming and/or cutting of reed switches are available. Please contact Littelfuse.
Drop-Out vs. Pull-In Chart
25
Max.
Part Numbering System
MACD-14-10-15
Series
20
Drop-Out (AT, L4989 Coil)
Min.
15
10
5
AT Range
10-15 AT
15-20 AT
20-25 AT
25-30 AT
Example:
10-15 AT product is
MACD-14-10-15
Note: These AT values are the before-modification values of the bare reed switch.
0
0
5
10
15
20
25
30
35
Pull-In (AT, L4989 Coil)
Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value.
Packaging
Packaging Option
Bulk
Packaging Specification
Bulk
Quantity
1000
Quantity & Packaging Code
N/A
Taping Width
N/A
© 2017 Littelfuse
Revised: 02/08/17
Specifications are subject to change without notice.
littelfuse.com
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