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3500a
3500

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 mV through< 0.5mV  with 50 nV stability.
u Patented Low Thermal Design. Patent #4,084,142.
u Low power coils to ensure low thermal EMF.
u High Insulation Resistance - 1012 W
u Control/Signal isolation of 1500 VDC
u High reliability, hermetically sealed contacts.
u Form A,  Dry or Hg Wet contacts. High Dielectric Strength.
u Epoxy coated steel shell provides magnetic shielding.

3500 Series Mechanicals

Dimensions in Inches (Millimeters)
3500mech1
P12mech2
3500ord
3500b
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3500 Series Specifications Table

Model  Number

 

 

35012
1 Form A

35022
2 Form A

35202,3
2 Form A
Hg Wet

35402
1 Form A
High Voltage

35412
2 Form A
High Voltage

Parameters

Test Conditions

Units

 

 

 

 

 

THERMAL EMF
OPTIONS

Measured after 5 minutes
at nominal coil voltage
Refer to Reed Relay
Technical Section for Details

mV

Individual
<5mV
<3mV
<1mV
      <0.5mV      

Differential
<5mV
<3mV
<1mV
    <0.5mV  

Differential
<10mV
<5mV
-
-

Individual
<5mV
<3mV
-
  -   

Differential
<5mV
<3mV
-
-

COIL SPECS.

 

 

 

 

 

 

 

Nom. Coil Voltage

 

VDC

5       12

5       12

5      12

5       12

5       12

Coil Resistance

+/- 10%, 25° C

W

350    2000

350    2000

200     850

200    1500

200    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 RATING

 

 

 

 

 

 

 

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 106 Ops.

500

100

1000

100

100

Static Contact
Resistance (max. init.)

50mV, 10mA

W

0.200

0.100

0.050

0.200

0.100

Dynamic Contact
Resistance (max. init.)

0.5V, 50mA
at 100 Hz, 1.5 msec

W

0.300

0.200

0.100

0.300

0.200

RELAY SPECIFICATIONS

 

 

 

 

 

 

 

Insulation Resistance
(minimum)

Between all Isolated  Pins
at 100V, 25°C, 40% RH

W

x 1012

x 1012

x 1012

x 1012

x 1012

Capacitance - Typical
Across Open Contacts

Without 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,
30 Hz Square Wave

msec.

0.75

0.75

2.0

1.0

1.0

Release Time - Typical

Zener-Diode Suppression4

msec.

0.1

0.1

1.0

0.2

0.2

 

 

 

35012
1 Form A

35022
2 Form A

35202,3
2 Form A
Hg Wet

35402
1 Form A
High Voltage

35412
2 Form A
High Voltage

Top View:
 Dot stamped on top of relay refers to pin #1 location
Grid = .1"x.1"  (2.54mm x 2.54mm)

Get It In .PDF Format

Notes:
1Consult factory for life expectancy at other switching loads.
2Models 3501 and 3540, optional electrostatic shield is tied to pin #5.  Models 3502, 3520 and 3541, optional electrostatic shield is tied to pin #13.
3Model 3520 has Hg wet contacts - position sensitive, must be mounted within 30° of vertical plane.  See schematic. Hg Content per capsule: Form A, 0.04 grams.
4Consists of 56V Zener diode and 1N4148 diode in series, connected in parallel with coil.
3500s1
3500s2
3500s3 3500s4 3500s5

Environmental Ratings
Storage Temp: -35°C to +100°C;
Operating Temp:  -20°C to +85°C
Solder Temp: 270°C max; 10 sec.max
The operate and release voltage and the coil resistance are specified at 25°C. These values vary by approximately 0.4%/°C as the ambient temperature varies.
Vibration:  20 G's to 2000 Hz;  Shock:  50 G's
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