Reed Switches Datasheet

MVSR-2019.7mm Reed Switch
RoHS

Description
The MVSR-20 series reed switch is a miniature, normally openswitch with a 19.69mm long x 2.66mm diameter (0.775” x 0.105”)glass envelope, capable of high voltage switching of up to 1kVdc
at 1mA. It has high insulation resistance of 10¹² ohms minimum
and contact resistance less than 100 milli-ohms.

Features and Benefits■ Miniature normally openswitch■ Capable of switching 1000
Vdc at 1 mA or 0.5 A up to10 W■ Minimum voltage breakdown2000 Vdc

Web Resources■ Hermetically sealed switch
contacts are not affected byand have no effect on theirexternal environment■ Zero operating power
required for contact closure■ Available sensitivity range
17-48AT

Download ECAD models, order samples, and findtechnical recources at www.littelfuse.com

Agency Approvals
AgencyAgency File Number

Ampere-Turns Range

E6700617-48 ATApplications■ Reed relays (particularlysuitable for high voltage
breakdown applications)

Note: Contact Littelfuse for specific agency approval ratings.

Dimensions■ Security

Dimensions in mm (inch)■ Industrial equipment■ Automatic test equipment■ Limit switching

CL OF OVERLAP(1.117) REF.
28.37(.105) MAX.
2.66(.685) MIN.
17.39

■ Telecoms line switching

Switch Type(.022) DIA. REF.
0.55

A (SPST-NO)

Contact Form

Body: GlassMaterials(.775) MAX.
19.69
(2.235) NOM.
56.77

Leads: Tin-plated Ni-Fe wire

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

Electrical Ratings
Contact Rating 1

Voltage 3

Current 3-W/VA - max.
Vdc - max.
Vac - max.

Switching 2
Breakdown 4

Vdc - min.
Adc - max.
Aac - max.
Adc - max.
pF - typ.
Ω - max.
Ω - min.

Switching 2
Carry

CapacitanceContactResistanceContact, Initial Insulation

Temperature

OperatingStorage 5°C

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 inductiveand/or capacitive loads, the effects of transient voltages and/or currents
should be considered. Referto Application Notes AN108A and AN107 for details.

101000265< 32AT = 2000 min
32-38 AT = 3000 min
37-48 AT = 3600 min
0.50
0.35
1.30
0.43
0.100
1012-65 to +125

3. Electrical Load Life Expectancy - Contact Littelfuse with voltage, current values along withtype of load.
4. Breakdown Voltage- perMIL-STD-202, Method 301.
5. Storage Temperature - Long time exposure at elevated temperature may degrade solderability of theleads.

1© 2024 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 07/09/24

Reed Switches Datasheet

MVSR-2019.7mm Reed Switch

Product Characteristics
Operating Characteristics

Operate Time 1
Release Time 1
Shock 2Vibration 2
Resonant Frequency

0.75ms - max.
0.30ms - max.
20G - max.
10G - max.
3.5kHz - typ.

11ms 1∕2 sine wave
50-2000 Hertz
Magnetic Characteristics

Pull-In Range 3
Rating Sensitivity 4
Test CoilAmpere Turns
Ampere Turns-17-4835 and 45
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.

Drop-Out vs. Pull-In Chart

Part Numbering System

MVSR-20-22-28

30
Max.

Drop-Out (AT, L4989 Coil)

2520Series

Min.

15AT Range
17-23 AT
17-28 AT
22-28 AT
22-33 AT
27-33 AT
27-38 AT

10500

510

15

20

2530

3540

Example:22-28 AT productis MVSR-20-22-28
MVSR-20E*-32-382
MVSR-20E*-37-432
MVSR-20E*-42-482
MVSR-20EH*-37-433
MVSR-20EH*-42-483

Pull-In (AT, L4989 Coil)

Note: Chart represents the range of Drop Out, min to max for a given Pull-In value.

Note:
1. These AT values are the before-modification values of the bare reed switch.
2. E = 3000V Voltage Breakdown
3. EH = 3600V Voltage Breakdown

Packaging
Packaging Option

Packaging Specification

Quantity

Quantity & Packaging Code

Taping Width

Bulk

Bulk

1000--Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are notdesigned for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimier-electronics.

2© 2024 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 07/09/24