MLRR-4 17-23 - LITTELFUSE - Datasheet.Live

Speciﬁcations are subject to change without notice.

MLRR-4 15.2mm Sub-miniature Close Differential Reed Switch

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

than 100 milli-ohms.

It can handle lamp loads up to 2W @ 14V with no suppression

circuitry. This reed switch is also available in a surface mount version,

that is, MLSM-4.

Agency Approvals

Agency Agency File Number Ampere-Turns Range

E47258

E471070 17-38 AT

DEMKO 14 ATEX 1393U 17-38 AT

Switch Type

Contact Form A (SPST-NO)

Materials Body: Glass

Leads: Tin Plated Nickel Iron

Axial Lead Reed Switches

Features

• Sub-miniature normally open switch

• Capable of switching 200Vdc or

1.0A at up to 20W

• Close differential AT between PI

and DO value

• Available sensitivity range 17-38 AT

• Capable of switching small

incandescent lamp loads

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

microcontroller logic level loads and

small incandesent lamp loads

Applications

• Position Sensing

• Security Systems

• Level Sensing

• Light Inductive Loads

• Office Equipments

• Lamp Loads up to 2W @ 14V

Dimensions

Dimensions in mm

Electrical Ratings

Contact Rating 1Watt - max. 20

Voltage 3

Switching 2

Breakdown 4

Vdc - max.

Vac - max.

Vdc - min.

200

140

250

Current 3

Switching 2

Carry

Adc - max.

Aac - max.

Adc - max.

1.0

0.7

1.0

Resistance Contact, Initial

Insulation

Ω - max.

Ω - min.

0.10

1010

Capacitance Contact pF - typ. 0.4

Temperature Operating

Storage 5

°C

-40 to +125

-65 to +125

High Power > MLRR-4

RoHS

Note: SPST-NO = Single-pole, single-throw, normally open

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.

CL OF OVERLAP

20.19

(.795) REF.

12.19

(.480) MIN.

15.24

(.600) MAX.

40.38

(1.590) NOM.

Ø2.66

(.105) MAX.

0.61

(0.024) DIA. REF.

Speciﬁcations are subject to change without notice.

Drop-Out vs. Pull-In Chart

Packaging

Packaging Option Packaging Specification Quantity Quantity & Packaging Code Taping Width

Bulk Bulk 3000 N/A N/A

Product Characteristics

Operating Characteristics

Operate Time 10.6ms - max.

Release Time 10.2ms - max.

Shock 211ms 1∕2 sine wave 100G - max.

Vibration 250-2000 Hertz 30G - max.

Resonant Frequency 6.25kHz - typ.

Part Numbering System

Magnetic Characteristics

Pull-In Range 3Ampere Turns 17-38

Rating Sensitivity 4Ampere Turns 20

Test Coil L4989

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.

Note: The chart represents the range of Drop-Out, minimum to maximum for a given Pull-In value.

Note: This AT value is the before-modification value of the bare reed switch.

MLRR-4-17-23

Series

AT Range

17-23 AT

17-28 AT

22-28 AT

22-33 AT

27-33 AT

27-38 AT

32-38 AT

Example:

17-23 AT product is

MLRR-4-17-23

Axial Lead Reed Switches

High Power > MLRR-4

MLRR-4 15.2mm Sub-miniature Close Differential Reed Switch

Additional Information

Datasheet Samples

Resources

0510 15 20 25

Pull-In (AT, L4989 Coil)

Drop-Out (AT, L4989 Coil)

30 35 40 45

Max.

Min.