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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 con-
tacts, 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
General data for all models RI-27
AT-Customization / Preformed 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 preformed leads
Coils
All characteristics are measured using the Philips
Standard Coil. For definitions of the Philips Standard
Coil, refer to the Reed Switch Technical & Application
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: 100 Hz)
Life expectancy: min. 109 operations with a failure rate
of less than 2x10-10 with a confidence level of 90%.
End of life criteria:
Contact resistance > 1Ω after 2 ms
Release time > 2ms (latching or contact sticking).
Loaded conditions (resistive load: 5 V; 100 mA;
operating frequency: 125 Hz)
RI-27AAA
Life expectancy: min. 2 x 107operations 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. 5x107 operations with a failure
rate of less than 0.5x10-8 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).
Dimensions in inches (mm)
105
For Most Recent Data, Consult the Coto Technology Website: www.cotorelay.com 6 E-mail: sales@cotorelay.com
RI-27 Series Dry Reed Switch
End of life criteria:
Contact resistance > 2Ω after 4 ms
Release time > 0.7 ms (latching or contact sticking).
Switching different loads involves different life expect-
ancy and reliability data. Further information is avail-
able on request.
Mechanical Data
Contact arrangement is normally open; lead finish is
tinned; net mass is approximately 100 mg; and can be
mounted in any position.
Shock
RI-27AA; RI-27A
The switches are tested in accordance with “IEC 68-2-
27”, test Ea (peak acceleration 150 G, half sinewave;
duration 11 ms). Such a shock will not cause an open
switch (no magnetic field present) to close, nor a switch
kept closed by an 80 AT coil to open.
Vibration
The switches are tested in accordance with “IEC 68-2-
6”, test Fc (acceleration 10 G; below cross-over fre-
quency 57 to 62 Hz; amplitude 0.75 mm; frequency
range 10 to 2000 Hz, duration 90 minutes). Such a
vibration will not cause an open switch (no magnetic
field present) to close, nor a switch kept closed by an
80 AT coil to open.
Mechanical Strength
The robustness of the terminations is tested in accor-
dance with “IEC 68-2-21”, test Ua1 (load 10 N).
Operating and Storage Temperature
Operating ambient temperature; min: -55°C; max:
+125°C.
Storage temperature; min: -55°C; max: +125°C.
Note: Temperature excursions up to 150°C may be
permissible. For more information contact your nearest
Coto Technology sales office.
Soldering
The switch can withstand soldering heat in accordance
with “IEC 68-2-20”, test Tb, method 1B: solder bath at
350 ±10° C for 3.5 ±0.5 s. Solderability is tested in
accordance with “IEC 68-2-20” test Ta, method 3:
solder globule temperature 235°C; ageing 1b: 4 hours
steam.
Welding
The leads can be welded
Mounting
The leads should not be bent closer than 1 mm to the
glass-to-metal seals. Stress on the seals should be
avoided. Care must be taken to prevent stray magnetic
fields from influencing the operating and measuring
conditions.
