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