![]() However, the key to creating an accurate and reliable constant current source depends on using low transconductance FETs as well as precision resistor values to convert the current into a precise and stable voltage.įield-effect transistors are commonly used to create a current source with junction FETs (JFETs) and Metal-oxide Semiconductor MOSFETs already being used in low current-source applications. Resistive voltage references can also be formed using constant current sources, because if you know the value of the resistance and the current flowing through it is constant and steady, then you can simply use Ohm’s law to find the voltage drop. Constant current sources and current sinks (the opposite of a current source) are a simple way to form biasing circuits or voltage references with a constant current value - for example, 100 uA, 1 mA, or 20 mA - using a single FET and resistor.Ĭonstant current sources are commonly used in capacitor charging circuits for accurate timing purposes or in rechargeable battery charging applications, as well as linear LED circuits for driving strings of LEDs at a constant brightness. ![]() The mobile version now includes a Buy-Now button that connects directly to our e-commerce division New 2022 PC VersionĬlick here to download your free Android versionĬlick here to download your free iPhone versionĭon't forget, you can now order popular components on-line from NTEPartsDirect.FET constant current sources use JFETs and MOSFETs to deliver a load current, which remains constant despite changes in load resistance or supply voltage.Ī FET constant current source is a type of active circuit that uses a field-effect transistor to supply a constant amount of current to a circuit. Search hundreds of thousands of devices such as semiconductors, relays, resistors, switches, potentiometers, trimmers, fuses, RF connectors, disc thermostats, terminal blocks, terminals and connectors, and more! Search results include links to easy-to-read, datasheet PDFs. This new version contains many new NTE devices, including all semiconductors added since the last update. With thousands of new parts added, you are now able to cross references over 700,000 industry part numbers. ![]() NTE Electronics has released the latest version of their popular cross reference software program, QUICKCross™. The industry's most comprehensive electronic cross reference software available today! ![]()
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