RHOPOINT 3541

3500 Series/Low Thermal EMF Reed Relays
L OW 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.
Refer to page 41 for Thermal EMF test methods.
3500 SERIES FEATURES
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Low Thermal EMF: < 10 µV through < 0.5 µV with 50 nV stability.
Patented Low Thermal Design. Patent #4,084,142.
Low power coils to ensure low thermal EMF.
High Insulation Resistance - 1012 Ω
Control/Signal isolation of 1500 VDC
High reliability, hermetically sealed contacts.
Form A, Dry or Hg Wet contacts. High Dielectric Strength.
Epoxy coated steel shell provides magnetic shielding.
(For Model #’s
3501 & 3540)
Bottom
View
(For Model #’s
3502, 3520, 3541)
2
Dimensions in Inches (Millimeters)
COTO TECHNOLOGY RHOPOINT COMPONENTS LTD, Email: [email protected] Website: www.rhopoint.co.uk
3500 Series/Low Thermal EMF Reed Relays
Model Number
Parameters
THERMAL EMF
….OPTIONS
COIL SPECS.
Nom. Coil Voltage
Coil Resistance
Operate Voltage
Release Voltage
Test Conditions
Measured after 5 minutes
at nominal coil voltage
Refer to Reed Relay
Technical Section for Details
Units
3501 2
3502 2
3520 2,3
1 Form A
2 Form A
2 Form A
3540 2
3541 2
1 Form A
2 Form A
High Voltage
High Voltage
µV
Individual
<5µV
<3µV
<1µV
<0.5µV
Differential
<5µV
<3µV
<1µV
<0.5µV
Differential
<10µV
<5µV
-
Individual
<5µV
<3µV
-
Differential
<5µV
<3µV
-
VDC
5
12
350 2000
3.8 9.0
0.4 1.0
5
200
3.8
0.4
5
12
200 1500
3.8 9.0
0.4 1.0
5
12
200 1500
3.8 9.0
0.4 1.0
+/- 10%, 25° C
Must Operate by
Must Release by
Ω
VDC - Max.
VDC - Min.
5
12
350 2000
3.8 9.0
0.4 1.0
12
850
9.0
1.0
CONTACT RATING
Switching Voltage
Switching Current
Carry Current
Contact Rating
Max DC/Peak AC Resist.
Max DC/Peak AC Resist.
Max DC/Peak AC Resist.
Max DC/Peak AC Resist.
Volts
Amps
Amps
Watts
200
0.5
1.5
10
200
0.5
1.5
10
500
1.0
2.0
28
500
0.5
2.0
10
500
0.5
2.0
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
Ω
0.200
0.100
0.050
0.200
0.100
Dynamic Contact
Resistance (max. init.)
0.5V, 50mA
at 100 Hz, 1.5 msec
Ω
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
Ω
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
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
Dielectric Strength
(minimum)
Top View:
Dot stamped on top of relay refers to pin #1 location
Grid = .1"x.1" (2.54mm x 2.54mm)
Notes:
Environmental Ratings
1
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
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 wet contacts - position sensitive, must be
mounted within 30° of vertical plane. See schematic.
4
Consists of 20V Zener-diode and 1N4002 diode in series,
connected in parallel with coil
COTO TECHNOLOGY
RHOPOINT COMPONENTS LTD Holland Rd, Hurst Green, Oxted, Surrey, RH8 9AX,ENGLAND