MDSR-10(15-20) - LITTELFUSE

Speciﬁcations are subject to change without notice.

MDSR-10 10.2mm Sub-miniature Reed Switch

Description

The MDSR-10 Reed Switch is a sub-miniature, normally open switch with a

10.16mm long x 1.80mm diameter (0.400” x 0.071”) glass envelope, capable of

switching 200Vdc at 10W. It has high insulation resistance of 10¹² ohms

minimum and low contact resistance of less than 120 milli-ohms. This reed

switch is also available in a surface mount version, that is, MDSM-10.

Agency Approvals

Agency Agency File Number Ampere-Turns Range

E47258

E471070 10-25 AT

Switch Type

Contact Form A (SPST-NO)

Materials Body: Glass

Leads: Tin-plated Ni-Fe wire

Axial Lead Reed Switches

Features

• Sub-miniature normally

open switch

• Capable of switching 200Vdc or

0.5A at up to 10W

• 1012 Ohms insulation resistance

• Available sensitivity range

10-25 AT

Benefits

• Hermetically sealed switch

contacts are not affected by and

have no effect on their external

environment

• Low space requirement

• Zero operating power required

for contact

• Excellent for switching

microcontroller logic level loads

Applications

• Reed Relays (particularly suited

to ATE type applications)

• Security Systems

• Limit Switching

• Office Equipments

Dimensions

Dimensions in mm (inch)

Low Power > MDSR-10

RoHS

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

Electrical Ratings

Contact Rating 1W/VA - max. 10

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.

0.50

0.35

1.00

Resistance Contact, Initial

Insulation

Ω - max.

Ω - min.

0.120

1012

Capacitance Contact pF - typ. 0.2

Temperature Operating

Storage 5

°C

-40 to +125

-65 to +125

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.

14.39

(.595) MIN.

10.16

(.400) MAX.

40.38

(1.590) NOM.

1.80

(.071) MAX.

0.43

(.01

7) DIA. REF.

Note: Contact Littelfuse for specific agency approval ratings.

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 1000 N/A N/A

Product Characteristics

Operating Characteristics

Operate Time 10.5ms - max.

Release Time 10.1ms - max.

Shock 211ms 1∕2 sine wave 100G - max.

Vibration 250-2000 Hertz 30G - max.

Resonant Frequency 8.5kHz - typ.

Part Numbering System

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.

Axial Lead Reed Switches

Low Power > MDSR-10

MDSR-10 10.2mm Sub-miniature Reed Switch

MDSR-10-10-15

Series

AT Range

10-25 AT

10-15 AT

15-20 AT

20-25 AT

Example:

10-15 AT product is

MDSR-10-10-15

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

Note: These AT values are the before-modification values of the bare reed switch.

Pull-In (AT, L4989 Coil)

Drop-Out (AT, L4989 Coil)

10 15 20 25 30

Max.

Min.

Magnetic Characteristics

Pull-In Range 3Ampere Turns 10-25

Rating Sensitivity 4Ampere Turns 15

Test Coil L4989