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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)
95
For Most Recent Data, Consult the Coto Technology Website: www.cotorelay.com 6 E-mail: info@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.
Model Number
RI-27AAA RI-27AA RI-27A
Parameters Test Conditions Units
Operating Characteristics
Operate Range AT 10-19 16-25 20-34
Release Range AT 4-16 5-18 7-19.5
Operate Time - including bounce (typ.) (energization) ms 0.25 (24 AT) 0.25 (31 AT) 0.25 (42.5 AT)
Bounce Time (typ.) (energization) ms 0.05 (24 AT) 0.05 (31 AT) 0.05 (42.5 AT)
Release Time (max) (energization)
µ
s30 (24 AT) 30 (31 AT) 30 (42.5 AT)
Resonant Frequency (typ.) Hz 6700 6700 6700
Electrical Characteristics
Switched Power (max) W 10 10 10
Switched Voltage DC (max) V 180 200 200
Switched Voltage AC, RMS value (max) V 130 140 140
Switched Current DC (max) mA 500 500 500
Switched Current AC, RMS value (max) mA 500 500 500
Carry Current DC; AC, RMS value (max) A 1.5 1.75 1.75
Breakdown Voltage (min) V 180 240 280
Contact Resistance (initial max) (energization) m
Ω
115 (20 AT) 115 (25 AT) 115 (25 AT)
Contact Resistance (initial typ.) (energization) m
Ω
90 (20 AT) 90 (25 AT) 90 (25 AT)
Contact Capacitance (max) without test coil pF 0.3 0.3 0.25
Insulation Resistance (min) RH
≤
45% M
Ω
10
6
10
6
10
6
