Reed Switch Datasheet

MATE-12B SeriesLong life > High Reliability > 12.7mm > Sub-miniature

Description
The MATE-12B Reed Switch is a sub-miniature, normally open
switch with a 12.70 mm long x 1.80 mm diameter (0.500" x 0.071")
glass envelope, capable of switching 200 Vdc at 10 W. It has highinsulation resistance of 10¹² Ohms minimum and low contact
resistance of less than 100 milli-Ohms.

Features & Benefits■ Suitable for various operating
environment/application■ Prolong operating life cycles■ Hermitically sealed■ Saves PCB space and reduceoverall weight for compact
size and light weight endproducts■ Miniature normally openswitch■ cULus recognition■ RoHS compliant■ Facilitates end productmeeting/passing cULus test/request■ Extending end productoperating life and reliability,
ideal for Automatic Test
Equipment (ATE)

Additional Information■ Environment friendly

Applications
Resources

Accessories■ Reed Relay particularly for
ATE application that requires
long lifeSamples■ Limit switching

Dimension in inch [mm].795 REF[20.19].530 MIN[13.45]

CL of Overlap.071 MAX[1.80]■ Appliance applications that
require long life and highreliability switch.0185 DIA
[0.47]

Agency Approvals.500 MAX[12.7]

Agency1.590 NOM
[40.38]Agency File Number

Ampere-Turns Range

E47258E471070

8–25 AT

Note: Contact Littelfuse for specific agency approval ratings.

Switch TypeContact Form

Materials

A (SPST-NO)

Body: Glass
Leads: Tin-plated Nickel Iron

Note:
SPST-NO = Single pole, single-throw, normally open1© 2023 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 11/28/23

Reed Switch Datasheet

MATE-12B SeriesLong life > High Reliability > 12.7mm > Sub-miniature

Electrical Ratings
Contact Type

Normally OpenContact Rating 1

VA/Watt - max.

10Vdc - max.
Vac - max.
Vdc - min.

200140250

Carry

Adc - max.
Aac - max.
Adc - max.

0.5
0.35
1.0

Contact, Initial
Insulation

Ω - max.
Ω - min.

0.100
1012

CapacitanceContactpF - typ.

0.7

Temperature

OperatingStorage 5°C°C-40 to +125
-65 to +125

SwitchingVoltage 3

2

Breakdown 4
Switching 2

Current 3
Resistance

Notes:
1. Contact rating - Product of the switching voltage and current should never exceed the power 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 soldarability of the leads.

Product Characteristics
Operating Characteristics
Operate Time

0.6 ms - max.

10.2 ms - max.

Release Time 1
Shock 2Vibration

11ms 1∕2 sine wave
50-2000 Hertz

2Resonant Frequency

100 G - max.
30 G - max.
6250 Hz - typ.

Magnetic Characteristics
Pull-In Range

Ampere Turns

3Rating Sensitivity

Ampere Turns

4

Test Coil

8–25 AT
20
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.

2© 2023 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 11/28/23

Reed Switch Datasheet

MATE-12B SeriesLong life > High Reliability > 12.7mm > Sub-miniature

Drop-out vs. Pull-In Chart

Part Numbering System

Drop Out (AT, L4989 Coil)20

MATE-12B-10-1515Series

10AT Range
8–13 AT
10–15 AT12–18 AT
17–23 AT
15–20 AT
20–25 AT

5005101520253035

Pull In (AT, L4989 Coil)Example:10–20 Ampere turns Pull-In
5–15 Ampere turns Drop-Out
Note: The chart represents the range of Drop-Out, minimum to maximum for a given Pull-In value.

Example:10-15 AT product is MATE-12B-10-15
Note: These AT values are the before-modification values of the bare Reed Switch.

Life Expectancy■ 5 Vdc, 20 mA, 100 Hz: Life = 100M cycles min■ 5 Vdc, 40 mA, 200 Hz: Life = 150M cycles B10■ 1 Vdc, 10 mA, 200 Hz Life = 1B cycles min
Note: Life test details available upon request.

Packaging
Packaging Option

Packaging Specification

Quantity

Quantity &Packaging Code

Taping WidthBulk

Bulk

1000

N/A

N/ADisclaimer 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
not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at http://www.littelfuse.com/disclaimer-electronics.

3© 2023 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 11/28/23