Temperature Linear Dimensions Force & Torque Plating Thickness Weight Electrical Ratings Rerating Current Inductive DC Loads; TV Ratings Operating Range & Dual Ratings Lamps & LEDs Rerating Application Considerations Ballast Resistor Calculations & Recommendations Processing Data Processing Recommendation Guide Process Sealed Switches; Automated Cleaning Specifications Manual Solder – Profiles A, B Wave Solder for Through Hole – Profiles A, B Reflow Solder for SMT – Profiles A, B Standards & Approvals UL Recognition, cULus Recognition, CSA Certification VDE, SEMKO, SEV, ISO, IP Plastics & Elements Touch Terms & Acronyms Terms & Acronyms Federal Supply Code Product Overview Ultra-Miniature, Subminiature, Miniature, Specialty, Illuminated, Standard & High Capacity

Conversions TEMPERATURE Celsius International thermometric scale with fixed points marked 0°C for freezing point and 100°C for boiling of water. Thermometric scale with fixed points marked 32°F for freezing point and 212°F for boiling of water. LINEAR DIMENSIONS PLATING THICKNESS

Electrical Ratings RERATING CURRENT FOR SWITCHES WITH 125V AC RATINGS Generally, most switch applications can be classified into one of the below load categories. Switch capacities can be mathematically rerated when the application calls for a category or voltage other than the switch standard general specification ratings, meaning original current ratings at 125V AC. NKK has not conducted life tests at these rerated voltages and currents so it is important to contact the factory in such cases. The candidate switch should be tested in the actual application in which it is intended to function....

Electrical Ratings INDUCTIVE LOADS circuits with the same voltage and current, DC circuits handle 1.414 times the power. Therefore, when opening or closing a switch on a DC load, the arc developed is more severe, more energetic, and lasts longer causing more contact erosion and a shorter switch life. A switch intended for a DC circuit should have its AC capacity rerated for DC. See previous page for rerating current. In AC circuits the voltage and current are varying in a sinusoidal pattern; both the voltage and current cross the zero reference 120 times per second for 60Hz. Therefore, the chances...

Electrical Ratings OPERATING RANGE Three contact materials are commonly used in NKK switches: gold, silver, and gold over silver. These materials give the options of low level, power level, plus combined power and low level ratings. Gold plated contacts are recommended for dry circuits, which are defined as very low energy. In circuits where the voltage is below 28 volts DC and current is below 100 milliamps (dry circuits), no arc develops as the contacts open or close. So, the tarnish remains. Eventually without the arc, the contacts become so encrusted that the switch is unable to close the...

Lamps & LEDs RERATING Rated Voltage [ ] Applied Voltage Applied Voltage [ ] Rated Voltage Applied Voltage [ ] Rated Voltage Tilt Touch AVERAGE LIFE (Multiplying Factor) 80 90 100 110 120 PERCENT RATIO OF DESIGN VOLTS CURRENT and MSCP (Multiplying Factor) CURRENT and MSCP (Multiplying Factor) AVERAGE LIFE (Multiplying Factor) For your convenience, the graph below illustrates the way current, candlepower, and life performance vary with percent changes in applied voltage. The graphed values are typical for miniature and subminiature lamps with the average life based on rated voltages at 60 cycles...

Lamps & LEDs APPLICATION CONSIDERATIONS LEDs green, yellow, amber, blue, white, or bicolor (red/ green) LEDs. Most of the LEDs used in our products require a ballast resistor connected in series with the LED. In addition, we offer 5-, 12-, and 24-volt lamps with internal resistors in the YB series. Light emitting diodes (LEDs) operate at relatively low current and DC voltage levels and have comparatively unlimited service life. Their characteristics do not change significantly with age, and they are not easily damaged by shock or vibration. A variety of NKK’s switches and indicators are offered...

Ballast Resistors BALLAST RESISTOR CALCULATIONS & RECOMMENDATIONS R = IF Resistor Value (Ohms) Source Voltage (V) Forward Voltage (V) Forward Current (A) R If the source voltage is greater than the rated voltage of a lamp or LED, a ballast resistor must be connected in series with the lamp. The following circuit diagram and formula will assist in calculating the value of the required ballast resistor. Watt recommendations provide a margin to reduce heat rise and increase life. SOURCE VOLTAGE E

Ballast Resistors BALLAST RESISTOR CALCULATIONS & RECOMMENDATIONS R If the source voltage is greater than the rated voltage of a lamp or LED, a ballast resistor must be connected in series with the lamp. The following circuit diagram and formula will assist in calculating the value of the required ballast resistor. – Watt recommendations provide a margin to reduce heat rise and increase life. FORWARD IF Resistor Value (Ohms) Source Voltage (V) Forward Voltage (V) Forward Current (A) VOLTAGE CURRENT

Processing Data PROCESSING RECOMMENDATION GUIDE PCB Vapor Phase Manual Solder Series & Type Wave Solder Vapor Phase Manual Solder Wave Solder Series & Type

Processing Data PROCESS SEALED SWITCHES NKK, a pioneer in the development of process sealed switches, is ahead of its time as a manufacturer. These process sealed switches are increasingly in demand because of the advancements in automated PC board processing. NKK’s expansive family of process compatible devices includes toggles, rockers, pushbuttons, tactiles, rotaries, keylocks and slides in a variety of sizes. Over 50 years of quality design experience produced the first process sealed switches to satisfy the process requirements of PC board soldering and cleaning techniques. As the cutaway...

Processing Data Wave Solder Profiles for Through Hole t3 Profile B Low Temperature 110°C 30 seconds 270°C 5 seconds 1.6mm 2 PCB with no Lead Profile A High Temperature 110°C 40 seconds 270°C 6 seconds 1.6mm 2 PCB with no Lead Preheat Temperature Preheat Time Peak Temperature Peak Time Thickness of PCB Cycles Comments Wave Solder Profile Reflow Solder Profiles for SMT 180°C ~ 200°C 120 seconds 230°C 60 seconds 250°C Not Specified 1.6mm 2 PCB with no Lead 150°C ~ 170°C 90 seconds 200°C 30 seconds 240°C Not Specified 1.6mm 2 PCB with no Lead Profile A High Temperature Preheat Temperature Preheat...