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Technical content

in Inches (Millimeters)

3500 Series Low Thermal EMF Reed Relays

The 3500 Series is ideally suited to the needs of Instrumentation, Data Acquisition and Process Control . The specification tables allow you to select the appropriate relay for your particular application . Recommended for use in high accuracy DVM’s, Multi - plexers and Digital or Analog Multipoint Recorders . If your requirements differ from the selection options, please consult Coto’s Factory to discuss a custom reed relay .

3500 Series Features

u Low Thermal EMF: < 10 µV through < 0 .5 µV with 50 nV stability u Patented Low Thermal Design . U .S . Patent #4,084,142 u Low power coils to ensure low thermal EMF u High Insulation Resistance - 1012Ω u Control/Signal isolation of 1500 VDC u High reliability, hermetically sealed contacts u Form A, Dry or Hg Wetted contacts . High Dielectric Strength u Epoxy coated steel shell provides magnetic shielding u RoHS compliant (except for 3520)

3500 SERIES/LOW THERMAL EMF REED RELAYS

1.00 .050 .485 MAX .200 .300 (5.08) (7.62) (1.27) (12.32) (0.66) (25.4) .026 DIA. .125 (3.17) .500 (12.7) 1 2 1413 1.20 (30.48) .050 (1.27) .100 .100 (2.54) (2.54) .500 (12.7) .485 MAX (12.32)

Ordering Information

Part Number XXXX XX X-- 1X Model Number 3501 3502 3520 3540 3541 Coil Voltage 05=5 volts 12=12 volts Shielding Options2 1=Electrostatic Shield Thermal EMF Rating See available ratings in specification table. 1=<10µV Hg Wetted Only 9=<5µV Dry or Wetted 8=<3µV Dry Only 7=<1µV Dry Only 5=<0.5µV Dry Only Bottom View For Model 3502, 3520 & 3541 For Model 3501 & 3540 tel: (401) 943.2686 | fax: (401) 942.0920 20 | page

Notes: 1 Consult factory for life expectancy at other switching loads . 2 Models 3501 and 3540, optional electrostatic shield is tied to pin #5 . Models 3502, 3520 and 3541, optional electrostatic shield is tied to pin #13 . 3 Model 3520 has Hg wetted contacts - position sensitive, must be mounted within 30° of vertical plane . See schematic . Hg content per cap- sule: Form A, 0 .04 grams . Environmental Ratings: Storage Temp: -35°C to +100°C; Operating Temp: -20°C to +85°C; Solder Temp: 270°C max; 10 sec . max All electrical parameters measured at 25°C unless otherwise specified . Vibration: 20 G’s to 2000 Hz; Shock: 50 G’s MODEL NUMBER 35012 35022 35202,3 35402 35412 Parameters Test Conditions Units 1 Form A 2 Form A 1 Form A Hg Wetted

1 Form A

2 Form A

(Refer to Reed Relay Technical Section for details) µV Individual <5µV <3µV <1µV <0.5µV Differential <5µV <3µV <1µV <0.5µV Differential <10µV <5µV Individual <5µV <3µV Differential <5µV <3µV COIL SPECS. Nom. Coil Voltage VDC 5 12 5 12 5 12 5 12 5 12 Coil Resistance +/- 10%, 25° C Ω 350 2000 350 2000 200 850 250 1500 250 1500 CONTACT RATINGS Switching Voltage Max DC/Peak AC Resist. Volts 200 200 500 500 500 Contact Rating Max DC/Peak AC Resist. Watts 10 10 28 10 10 Life Expectancy-Typical1 Signal Level 1.0V, 10mA x 106 Ops. 500 100 1000 100 100 Static Contact Dynamic Contact Resistance (max. init.) 0.5V, 50mA RELAY SPECIFICATIONS Insulation Resistance (minimum) Between all Isolated Pins at 100V, 25°C, 40% RH Ω 1012 1012 1012 1012 1012 Capacitance - Typical Across Open Contacts No Shield Shield Guarding pF pF 3.0 1.9 1.7 0.2 1.7 0.2 3.0 1.9 1.7 0.2 Dielectric Strength (minimum) Between Contacts Contacts to Shield Contacts/Shield to Coil VDC/peak AC VDC/peak AC VDC/peak AC 700 1000 1500 350 1000 1500 1000 1000 1500 1500 1000 1500 1500 1000 1500 Operate Time - including bounce - Typical At Nominal Coil Voltage, Top View4: Dot stamped on top of relay refers to pin #1 location Grid = .1”x.1” (2.54mm x 2.54mm) 113 59 2610 UP 113 412 5113 412 5 113 59 2610 113 59 2610 COTO TECHNOLOGY, INC.For most recent data visit www.cotorelay.com page | 21