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CN-0032
Change Notice
YB Illuminated Series
New AT628 LEDs
Type of Change:
Engineering
Product
Part Number
Appearance
YB Illuminated Pushbuttons
AT628 Bright LED
The new AT628 LED specifications for YB Illuminated Series supersede all previous LED specifications. The change for the new
AT628F LED affects all green models in YB Illuminated Pushbuttons, both standard and custom switches, as well as indicators.
LED Specifications
From Current LED
Specifications
for AT628
Double Element LED
(+)
To New LED
Specifications
for AT628
(-)
T-1 Bi-pin
5C
5D
5F
5C
5D
5F
Red
Amber
Green
Red
Amber
Green
Forward Peak Current
I FM
40mA
40mA
40mA
40mA
40mA
40mA
Continuous Forward Current
IF
26mA
26mA
26mA
26mA
26mA
26mA
Forward Voltage (I F = 16mA)
VF
1.9V
2.0V
2.2V
1.9V
2.0V
2.0V
Reverse Peak Voltage
VRM
4V
4V
4V
4V
4V
4V
Current Reduction Rate Above 25°C
∆ IF
0.50mA/°C
0.50mA/°C
0.50mA/°C
Ambient Temperature Range
0.50mA/°C
–25°C ~ +50°C
–25°C ~ +50°C
The LED circuit is independent of switch operation.
Electrical specifications are determined at a basic temperature of 25°C.
If the source voltage exceeds rated voltage, a ballast resistor is required.
The resistor value can be calculated by using the formula shown here.
R
+
IF
Anode
VF
E
Cathode
–
R =
Where: R =
E =
VF =
IF =
E – VF
IF
Resistor Value (Ohms)
Source Voltage (V)
Forward Voltage (V)
Forward Current (A)
Note: All three LEDs are new, despite no changes to specifications of Red and Amber LEDs.
Availability
New AT628 LEDs will be available with December 2008 production.
www.nkkswitches.com
1.877.2BUYNKK
228.9655
Engineering Department
7850 East Gelding Drive • Scottsdale, AZ 85260
Telephone 480.991.0942 • Fax 480.998.1435
10/14/08
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