CN-0240 Change Notice HB Series Illuminated Pushbuttons LED Specification Changes for AT633 Type of Change: Engineering Product Part Number Appearance The HB Series Illuminated Pushbuttons and Indicators will have changes to the bright LEDs. These changes will effect the illumination of all models, both standard and custom. Differences in the LED specification values are outlined in the following table, in addition to a change of dimensions for AT633 LED. HB Pushbuttons HB Indicator BRIGHT LED CODES & SPECIFICATIONS Electrical specifications are determined at a basic temperature of 25°C. (+) (-) Color Before Change 5C Red 5D Amber After Change 5F 5C Green 5D Red 5F Amber Green Maximum Forward Current I FM 30mA 30mA 25mA 30mA 30mA 30mA Typical Forward Current IF 20mA 20mA 20mA 20mA 20mA 20mA Forward Voltage VF 1.85V 2.0V 2.2V 1.95V 2.0V 2.1V Maximum Reverse Voltage VRM 5V 5V 5V 5V 5V 5V Current Reduction Rate Above 25°C ∆I F 0.40mA/°C 0.42mA/°C 0.38mA/°C 0.42mA/°C 0.42mA/°C 0.42mA/°C Ambient Temperature Range ( I F = 20 )mA ( I F = 20 )mA ( I F = 20 )mA ( I F = 20 )mA ( I F = 20 )mA ( I F = 20 )mA –25°C ~ +50°C Bright LED AT633 (3.0) Dia .118 (5.2) .205 (5.0) .197 Change to Dimensions Orientation mark black dot changing to D flat Black Dot (+) –25°C ~ +50°C (3.0) Dia .118 (–) D Flat (3.2) .126 The LED circuit is isolated and requires an external power source. If the source voltage exceeds rated voltage, a ballast resistor is required. The resistor value can be calculated by using the formula shown here. Notes: There are no changes to external dimensions of switches or indicators. Contact factory if further details are needed. R + IF Anode VF E Cathode – (+) (–) (3.2) .126 R = Where: R = E = VF = IF = E – VF IF Resistor Value (Ohms) Source Voltage (V) Forward Voltage (V) Forward Current (A) Effective Date Changes to AT633 LEDs will be effective February 2015. http://www.nkkswitches.com • 1.877.2BUYNKK (228.9655) 7850 East Gelding Drive • Scottsdale, AZ 85260 • Telephone 480.991.0942 • Fax 480.998.1435 2014/11/10 Engineering Department Page 1 of 2 Change Notice CN-0240 HB Series Illuminated Pushbuttons The AT633 LEDs will have changes that will effect illumination for Red, Amber and Green. These changes will alter all models, both standard and custom, of HB illuminated pushbuttons and indicators. Standard part numbers effected by these changes are listed in the following table. AT633 LED BRIGHT LED for HB ILLUMINATED PUSHBUTTONS & INDICATORS AT633C Red AT633D Amber AT633F Green HB SERIES PUSHBUTTONS with BRIGHT LED HB15CKW01-5C HB15CKW01-5D HB15CKW01-5F HB15SKW01-5C HB15SKW01-5D HB15SKW01-5F HB16CKW01-5C HB16CKW01-5D HB16CKW01-5F HB16SKW01-5C HB16SKW01-5D HB16SKW01-5F HB SERIES INDICATORS with BRIGHT LED HB01W01-5C HB01W01-5D HB01W01-5F HB02W01-5C HB02W01-5D HB02W01-5F http://www.nkkswitches.com • 1.877.2BUYNKK (228.9655) 7850 East Gelding Drive • Scottsdale, AZ 85260 • Telephone 480.991.0942 • Fax 480.998.1435 Page 2 of 2