Components Blog is the place for conversation and discussion about analog/mixed
signal, discrete & power devices, processors, interface & logic,
passives, and memory. Here, you'll find everything from application ideas, to news and industry trends, to hot topics and cutting edge innovations.
Transistors, as you
probably know, are fundamental electronic devices used to amplify and switch
current signals. When combined in a circuit, they can be used for the
simultaneous control of a number of devices. That's the power of transistor
arrays--semiconductor integrated circuits which combine a number of transistors
within a solid substrate.
Transistor arrays are an important component
of circuits used in all sorts of equipment and applications. Buying a drink at
a vending machine, being cooled by an air conditioner, communicating via fax
machine, or riding an elevator are just some of the devices we use every day
which incorporate transistor arrays.
For those of us who
use these individual components, Texas Instruments has released an upgrade of
the popular ULN2003 series: the ULN2003LV. This 7-channel transistor array may
be just what the doctor (or electrical engineer) ordered for low-voltage (3V-to-5V)
relay and inductive coil applications.
What is special
about the ULN2003LV is its low impedance drivers which minimize on-chip power
dissipation - up to 5 times lower than typical 3V relays. Additionally, it has
an input interface that reduces current drawn from the external drivers.
Compatibility-wise, the ULN2003LV is quite versatile, featuring support for
3.3V to 5V CMOS logic input interfaces, and pin-to-pin compatibility with other
ULN2003 devices in similar packages.
Specific uses for
the ULN2003LV include:
Relay and inductive load drivers in various telecom, consumer, and industrial applications
Lamp and LED displays
Logic level shifters
Of course, the function of the transistor array is as broad as its range of use. What are some of the projects you've used transistor arrays for?
A man who can make a fool of himself in three languages strikes me as a three-time-bigger fool than a man who is confined to one! John le Carré/David John Moore Cornwell - The Tailor of Panama.
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover." -- Mark Twain