G2R-1-SND-DC12(S) Omron, G2R-1-SND-DC12(S) Datasheet - Page 23

• Manufacturer Part Number: G2R-1-SND-DC12(S)
• Description: RELAY SPDT 12VDC PLUG-IN W/LED
• Manufacturer: Omron
• Series: G2RSr

Specifications of G2R-1-SND-DC12(S)

• Relay Type: General Purpose
• Contact Form: SPDT (1 Form C)
• Contact Rating (current): 10A
• Switching Voltage: 440VAC, 125VDC - Max
• Coil Type: Standard
• Coil Current: 43.2mA
• Coil Voltage: 12VDC
• Turn On Voltage (max): 8.4 VDC
• Turn Off Voltage (min): 1.8 VDC
• Mounting Type: Socket
• Termination Style: Quick Connect - .187" (4.7mm)
• Circuit: SPDT (1 Form C)
• Contact Rating @ Voltage: 10A @ 250VAC
• Control On Voltage (max): 8.4 VDC
• Control Off Voltage (min): 1.8 VDC
• Coil Voltage Vdc Nom: 12V
• Contact Current Max: 10A
• Contact Voltage Ac Nom: 250V
• Contact Voltage Dc Nom: 30V
• Coil Resistance: 278ohm
• Contact Configuration: SPDT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: G2R-1-SNDDC12(S); G2R-1-SNDDC12(S); G2R1SNDDC12S; Z2952

I
7. Using the following formula, calculate the power dissipated by the
Total power dissipation vs. ambient temperature
In case the total dissipation exceeds the permissible power dissipa-
tion, either attach a radiator plate to the transistor, or replace the
transistor.
8. Determine the supply voltage to the relay.
C
vs. V
transistor to confirm that it is within the range of permissible
power dissipation of the transistor.
Total power dissipation P
pation P
P
(V
P
(For details on l
Confirm that P
representing the total power dissipation vs. ambient temperature
characteristics.
The maximum and minimum values of the supply voltage to the
relay are determined by the following expressions using the
upper- and lower-limit values of the pickup voltage V
step 6.
Maximum supply voltage ≤ Upperlimit pickup voltage + V
Minimum supply voltage ≥ Lowerlimit pickup voltage + V
C
B
CE
= Maximum value of pickup voltage/ Coil resistance x V
= l
is determined in step 6.)
CE
B
x 0.6 to 1
characteristics (Example)
B
where,
T
B
obtained by the above formula is within the curve
, refer to step 6.)
T
= Collector dissipation P
Electromechanical Relays
C
CE
+ Base dissi-
obtained in
CE
CE
CE
9. Verify that the following conditions are satisfied.
10.Check the following items during actual use of the relay.
From the above discussion, the best relay coil should be rated at
12 VDC or 24 VDC when the relay is driven by a transistor.
■ Driving by Darlington-
To reduce the current of the transistor to drive the relay (i.e., base
current of the transistor), two transistors may be used, via Darlington
connection. Darlington connected transistors are available enclosed
in a single package.
NPN-NPN Darlington Connection
When the Darlington-connected transistors are used, the required
value of V
reason, consideration must be given to designing the total power dis-
sipation and supply voltage for the second transistor, Tr2.
Rated voltage of relay
Coil current*
I
V
Driving current of transistor
Voltage drop V
Voltage dropV
Total power dissipation P
C
* Determine the safety factor giving consideration to external
* Inversely proportional to voltage
** Often used V
ECO
of switching transistor
V
V
• Is the upper-limit value of the pickup voltage equal to or less
• Is the lower-limit value of the pickup voltage equal to or more
• Are the above conditions satisfied within the operating tempera-
• Is there any abnormality found in a test run?
In addition to checking the above items, take into consideration
the items listed in this table.
Connected Transistors
CEO
CBO
surge (such as lightning and surge from other devices).
than the rated value when the maximum supply voltage is
applied?
than the rated value when the minimum supply voltage is
applied?
ture range?
, V
CEO
> (Maximum supply voltage + surge voltage) x safety factor*
> (Maximum supply voltage + surge voltage) x safety factor*
CE
of switching transistor**
Technical Information
is higher than when using a single transistor. For this
BE
CE
in transistor
in transistor
CEO
: 35 to 60 V
T
of transistor
Low
High
High
Low
High
High
High
High
High
Low
Low
High
Low
Low
Low
Low
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