RI-27 Series Dry Reed Switch

RI-27 Series

Pico dry-reed switch hermetically sealed in a gas-filled glass envelope.

Single-pole, single-throw (SPST) type, having normally open contacts, and

containing two magnetically actuated reeds.

The switch is of the double-ended type and may be actuated by an

electromagnet, a permanent magnet or a combination of both.The device is

intended for use in relays, sensors, pulse counters or similar devices.

RI-27 Series Features

▪ Ideal for ATE switching

▪ Contact layers: gold, sputtered ruthenium

▪ Superior glass-to-metal seal and blade alignment

▪ Excellent life expectancy and reliability

▪ RoHS Compliant

Dimensions for RI-27 Series

All Dimension in inches (mm) nominal

General data for all models RI-27

AT-Customization / Performed Leads

Besides the standard models, customized products can also

be supplied offering the following options:

• Operate and release ranges to customer specification

• Cropped and/or performed leads

Coils

All characteristics are measured using the Philips Standard

Coil. For definitions of the Philips Standard Coil, refer to

“Application Notes” in the Reed Switch Technical & Applica-

tion Information Section of this catalog.

Life expectancy and reliability

The life expectancy data given below are valid for a coil

energized at 1.25 times the published maximum operate

value for each type in the RI-27 series.

No load conditions (operating frequency: 100Hz)

Life expectancy: min. 109 operations with a failure rate of

less than 2 x 10-10 with a confidence level of 90%.

End of life criteria:

Contact resistance > 1Ω after 2 ms

Release time > 2 ms (latching or contact sticking).

Loaded conditions (resistive load: 5 V; 100 mA;

operating frequency: 125 Hz)

RI-27AAA

Life expectancy: min. 2 x 107 operations with a failure rate

of less than 10-8 with a confidence level of 90%.

End of life criteria:

Contact resistance > 1Ω after 2.5 ms

Release time > 1 ms (latching or contact sticking).

RI-27AA; RI-27A

Life expectancy: min. 5 x 107 operations with a failure rate

of less than 0.5 x 10-8 with a confidence level of 90%.

End of life criteria:

Contact resistance > 1Ω after 2.5 ms

Release time > 1 ms (latching or contact sticking).

Loaded conditions (resistive load: 12 V; 4 mA;

(15 mA peak); operating frequency: 170 Hz)

RI-27AAA Not applicable.

RI-27AA; RI-27A

Life expectancy: min. 45 x 106 operations (tested up to

50 x 106 operations).

0.020 max

(Ø0.50)

0.906 ± 0.020

(23.0 ± 0.5)

1.811 ± 0.020

(46.0 ± 0.5)

0.520 max

(13.2)

0.071 max

(Ø1.8)

tinned

Group

®

formerly

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