3501-05-511

## **3500 SERIES/LOW THERMAL EMF REED RELAYS** 

## **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, Multiplexers 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 - 10[12] Ω 

- 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) 

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DIMENSIONS<br>in Inches (Millimeters)<br>1.20 .500 .500<br>(30.48) (12.7) (12.7)<br>-~ 7 TF +e<br>.485 MAX<br>.485 MAX<br>(12.32)<br>(12.32)<br>.050<br>.050 .100<br>(25.4)1.00 (1.27) .200 (1.27) (2.54)<br>.125 (5.08) .100<br>(3.17) (2.54)<br>.300<br>L \ .026 DIA. et (7.62) ni<br>(0.66) For Model For Model<br>3501 & 3540 3502, 3520 & 3541<br>13<br>14<br>2<br>1<br>**----- End of picture text -----**<br>


**Bottom View** 

## **Ordering Information** 

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Part Number XXXX-XX-X1X<br>Model Number Shielding Options [2]<br>3501 3502   3520   3540   3541 1=Electrostatic Shield<br>Coil Voltage<br>05=5 volts<br>12=12 volts Thermal EMF Rating<br>**----- End of picture text -----**<br>


**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 

07082013 

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## **MODEL NUMBER 3501[2] 3502[2] 3520[2,3] 3540[2] 3541[2] Parameters Test Conditions Units 1 Form A 2 Form A 1 Form A 1 Form A 2 Form A** ~~—~~ Hg Wetted High Voltage High Voltage Measured after Individual Differential Differential Individual Differential 5 minutes at nominal <5µV <5µV <10µV <5µV <5µV Thermal EMF Options coil voltage µV <3µV <3µV <5µV <3µV <3µV - - - (Refer to Reed Relay <1µV <1µV Technical Section for details) <0.5µV <0.5µV - - - **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 Operate Voltage Must Operate by VDC - Max. 3.8 9.0 3.8 9.0 3.8 9.0 3.8 9.0 3.8 9.0 Release Voltage Must Release by VDC - Min. 0.4 1.0 0.4 1.0 0.4 1.0 0.4 1.0 0.4 1.0 **CONTACT RATINGS** Switching Voltage Max DC/Peak AC Resist. Volts 200 200 500 500 500 ~~===~~ Switching Current Max DC/Peak AC Resist. Amps 0.5 0.5 1.0 0.5 0.5 Carry Current Max DC/Peak AC Resist. Amps 1.5 1.5 2.0 2.0 2.0 ~~==~~ Contact Rating Max DC/Peak AC Resist. Watts 10 10 28 10 10 Life Expectancy-Typical[1] Signal Level 1.0V, 10mA x 10[6] Ops. 500 100 1000 100 100 Static Contact 50mV, 10mA Ω 0.200 0.100 0.050 0.200 0.100 Resistance (max. init.) ~~i —_—~~ Dynamic Contact 0.5V, 50mA Ω 0.300 0.200 0.100 0.300 0.200 Resistance (max. init.) at 100 Hz, 1.5 msec **RELAY SPECIFICATIONS** Insulation Resistance Between all Isolated Pins Ω 10[12] 10[12] 10[12] 10[12] 10[12] (minimum) at 100V, 25°C, 40% RH Capacitance - Typical No Shield pF 3.0 1.7 1.7 3.0 1.7 Across Open Contacts Shield Guarding pF 1.9 0.2 0.2 1.9 0.2 ~~—_—~~ Between Contacts VDC/peak AC 700 350 1000 1500 1500 Dielectric Strength Contacts to Shield VDC/peak AC 1000 1000 1000 1000 1000 (minimum) Contacts/Shield to Coil VDC/peak AC 1500 1500 1500 1500 1500 ~~|~~ Operate Time - including At Nominal Coil Voltage, ~~a~~ msec. ~~i~~ 0.75 0.75 ~~he~~ 2.0 1.0 1.0 bounce - Typical 30 Hz Square Wave Release Time - Typical msec. 0.1 0.1 1.0 0.2 0.2 13 5 1 13 9 5 1 13 9 5 1 13 5 1 13 9 5 1 Top View[4] : Dot stamped on top of relay refers to pin #1 location Grid = .1”x.1”  (2.54mm x 2.54mm) UP **Notes:** 12 4 10 6 2 10 6 2 12 4 10 6 2 1 Consult factory for life expectancy at other switching loads. ~~sili~~ 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 capsule: 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 07082013 **For most recent data visit www.cotorelay.com COTO TECHNOLOGY, INC.**