Many times Digi-Key customers call in or chat looking for help finding parts with certain specifications they can not find on our site. Many times we find the customer is just not looking at the right specification. Capacitors are a prime example of this. On the Digi-Key sight you will find items listed as pF(pico Farad) or µF (micro Farad), however in the real world you may find thing in nF(nano) or just in F. This is where the Digi-Key calculators can come in handy. Using the Capacitance Conversion Calculator you can convert from one value to another with the press of a button.
The Battery Life calculator is another one many of our customers find useful. Generally, battery life is calculated based on the current rating in milli Ampere Hours, which is abbreviated as mAh. Ampere is an electrical unit used to measure the current flow towards the load. The battery life or capacity can be calculated from the input current rating of the battery and the load current of the circuit. Battery life will be high when the load current is less and vice versa. The calculation to find out the capacity of battery can be mathematically derived from the following formula:
Battery Life in Hours (h) = Battery Capacity in Milli amp hours (mAh) / Load Current in Mill amps (mA) * 0.70
*Note: The Factor of 0.7 makes allowances for external factors which can affect battery life.
Here is also the standard 4 band color chart.
You can also use Digi-Key’s calculators as a quick and easy-to-use resource and don’t forget to bookmark the page for future use.