86 COTO TECHNOLOGY (USA) Tel: (401) 943-2686 / Fax (401) 942-0920 6 (Europe) Tel: +31-45-5439343 / Fax +31-45-5427216
RI-80 Series
Ultra-micro 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 sensors, relays, pulse counters or
similar devices.
RI-80 Series Features
Ideal for ATE switching, proximity sensors & medical applications
World’s smallest high quality reed switch
Contact layers: Gold, sputtered ruthenium
Superior glass-to-metal seal and blade alignment
General data for all models RI-80
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, see Reed 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-80 series.
No-load conditions (operating frequency: 100 Hz)
Life expectancy: min. 108 operations with a failure rate
of less than 2 x10-9 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: 5V; 100 mA;
operating frequency: 170 Hz)
Life expectancy: min. 107operations with a failure
rate of less than 10-8 with a confidence level of 90%.
End of life criteria:
Contact resistance > 2Ω after 4 ms
Release time > .7 ms (latching or contact sticking)
Switching different loads involves different life expect-
ancy and reliability data. Further information available
upon request.
Mechanical Data
Contact arrangement is normally open; lead finish is
tinned; net mass is approximately 65mg; and can be
mounted in any position.
Dimensions in inches (mm)
RI-80 Series Dry Reed Switch
87
For Most Recent Data, Consult the Coto Technology Website: www.cotorelay.com 6 E-mail: info@cotorelay.com
RI-80 Series Dry Reed Switch
Shock
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 10G; below cross-
over frequency 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 10N).
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.
* Only for switches with AT operate value > 10AT
Model Number
RI-80
Parameters Test Conditions Units
Operating Characteristics
Operate Range AT 5-15
Release Range AT 2-13
Operate Time - including bounce (typ.) ms 0.35 (20 AT)
Bounce Time (typ.) ms 0.1 (20 AT)
Release Time (max)
µ
s 20 (20 AT)
Resonant Frequency (typ.) Hz 21.300
Electrical Characteristics
Switched Power (max) W 5
Switched Voltage DC (max) V 200*
Switched Voltage AC, RMS value (max) V 140
Switched Current DC (max) mA 350
Switched Current AC, RMS value (max) mA 250
Carry Current DC; AC, RMS value (max) A 0.5
Breakdown Voltage (min) V 230
Contact Resistance (initial max) (energization) m
Ω
160 (20 AT)
Contact Resistance (initial typ.) (energization) m
Ω
140 (20 AT)
Contact Capacitance (max) without test coil pF 0.45
Insulation Resistance (min) RH
≤
45% M
Ω
10
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