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Axial Lead Reed Switches
(1.590) NOM.
(0.024) DIA. REF.
High Power > MLRR-4
MLRR-4 15.2mm Sub-miniature Close Differential Reed Switch
RoHS
Description
The MLRR-4 Reed Switch is a sub-miniature, normally open switch with a
15.24mm long x 2.54mm diameter (0.600” x 0.100”) glass envelope, and capable
of switching 200Vdc at 20W with close differential (CD) characteristics. It has
high insulation resistance of 1010 ohms minimum and contact resistance less
Agency Approvals
than 100 milli-ohms.
circuitry. This reed switch is also available in a surface mount version,
that is, MLSM-4.
Features
• Sub-miniature normally open switch
• Capable of switching 200Vdc or
1.0A at up to 20W
• Close dif ferential AT between PI
and DO value
It can handle lamp loads up to 2W @ 14V with no suppression
• Available sensitivit y range 17-38 AT
• Capable of switching small
incandescent lamp loads
Agency Agency File Number Ampere-Turns Range
E47258
E471070
DEMKO 14 ATEX 1393U 17-38 AT
17-38 AT
Benefits
• Hermetically sealed switch contacts
are not af fected by and have no
effect on their external environment
• Zero operating power required for
• Excellent for switching
microcontroller logic level loads and
small incandesent lamp loads
contact closure
Dimensions
Dimensions in mm
CL OF OVERLAP
20.19
(.795) REF.
Ø2.66
(.105) MAX.
0.61
Applications
• Position Sensing
• Security Systems
• Level Sensing
• Light Inductive Loads
• Office Equipments
• Lamp Loads up to 2W @ 14V
Switch Type
12.19
(.480) MIN.
15.24
(.600) MAX.
40.38
Contact Form A (SPST-NO)
Materials
Note: SPST-NO = Single-pole, single-throw, normally open
Body: Glass
Leads: Tin Plated Nickel Iron
Electrical Ratings
Contact Rating
Voltage
Current
Resistance
Capacitance Contact pF - typ. 0.4
Temperature
Notes:
1. Contact rating - Product of the switching voltage and curr ent should never exceed the wattage rating. Cont act Littelfuse for additional load/life information.
2. When switching inductive and /or capacitive lo ads, the effects of transient voltages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details.
3. Electrical Load Life Expectanc y - Contact Lit telfuse with voltage, current values along with type of load.
4. Breakdown Voltage - per MIL-STD-202, Method 301.
5. Stor age Temperature - Long time ex posure at elevat ed temperatur e may degr ade solderabilit y of the leads.
1
3
Switching
Breakdown
3
Switching
2
4
2
Carry
Contact, Initial
Insulation
Operating
Storage
5
Watt - max. 20
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
°C
°C
200
140
250
1.0
0.7
1.0
0.10
10
-40 to +125
-65 to +125
10
Specifications are subject to change without notice.
littelfuse.com© 2015 Littelfuse
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Axial Lead Reed Switches
Pull-In (AT, L4989 Coil)
Drop-Out (AT, L4989 Coil)
50
40
High Power > MLRR-4
MLRR-4 15.2mm Sub-miniature Close Differential Reed Switch
Product Characteristics
Operating Characteristics
Operate Time
Release Time
Shock
Vibration
1
1
2
2
11ms 1∕2 sine wave 100G - max.
50-2000 Hertz 30G - max.
0.6ms - max.
0.2ms - max.
Resonant Frequency 6.25kHz - typ.
Magnetic Characteristics
Pull-In Range
Rating Sensitivity
Test Coil L4989
Notes:
1. Operate (including bounce)/Rele ase Time - per EIA /NA RM RS- 421-A,diode suppresse d coil (Coil II).
2. Shock and Vibration - per EIA/ NARM RS-421-A and MIL-STD-20 2.
3. Pull-In Range - Contac t Littelfuse for narrower AT ranges available.
4. Rating Sensitivity - The value at which contact ratings and operating character istics are deter mined. Derating may be required below this value.
5. Custom modifications of forming and/or cutting of reed switches are available. Please contact Lit telfuse.
Drop-Out vs. Pull-In Chart
35
30
25
3
4
Ampere Turns 17-38
Ampere Turns 20
Part Numbering System
Max.
Min.
Series
MLRR-4-17-23
20
15
10
AT Range
17-23 AT
17-28 AT
22-28 AT
Example:
17-23 AT product is
MLRR-4-17-23
22-33 AT
5
0
0510 15 20 25
Note: T he char t represents the range of Drop- Out, minimum to max imum for a given Pull-In value.
30 35 40 45
Note: T his AT value is the before-modification value of the bare reed swit ch.
27-33 AT
27-38 AT
32-38 AT
Additional Information
Datasheet
Resources
Packaging
Packaging Option Packaging Specification Quantity Quantity & Packaging Code Taping Width
Bulk Bulk 3000 N/A N/A
Specifications are subject to change without notice.
Specifications are subject to change without notice.
Samples
littelfuse.com© 2015 Littelfuse
littelfuse.com© 2015 Littelfuse
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