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Texas Instruments ULN2803ADWG4 Darlington Driver SO18

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Darlington transistor array, 8 drivers, CMOS, TTL input compatibility, 500mA peak output current, 50V output voltage, 50V switching voltage, 130ns delay time, -40 to +85°C, 18-SOIC case, high-voltage, high-current Darlington transistor array consists of eight NPN Darlington pairs that feature high-voltage outputs with Common-Cathode clamp diodes for switching inductive loads, applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers and logic buffers.

DeviceDescriptionManufacturerPackageOrder code
ULN20037x NPN matched transistor array (TTL/CMOS)STDIL-1682-0618
ULN20047x NPN matched transistor array (TTL/CMOS)STDIL-1682-0622
ULN28038x NPN Darlington array (TTL/CMOS)STDIL-1882-0668
ULN2803ADWG48x NPN Darlington array (TTL/CMOS)TISO-1882-0669
ULN2804A8x NPN Darlington transistor array (CMOS)STDIL-1882-0670
LM3046M5x NPNgeneral purpose (2x matched pairs)NSCSO-1482-5032
ULN2003AD7x NPN matched transistor arrayTISO-1682-5036

Question by N.Chettleburgh | Product code: 82-0669
02 August 2013

Q Would this be one of the best choices to buffer the action of Raspberry Pi pin(s) when defined as output. Is this 100% safe way of protecting the Pi even if the Pi pin is accidently redefined as an input pin when still wired as an output pin. Thank you.
A Hi N Chettleburgh. Thank you for your question. This should be fine to use when configured as an output. If left in the circuit and re-configured as an input, because of the high impedance we would think that it would do nothing and should not harm the Raspberry Pi.

Ideal for building interface for computers
Reviewed by: Nyge
02 August 2013

Using this chip it is possible to build a forgiving interface to link computer output to relays ... relays are ideal for operating most everyday technology applications such as motors. It is all straightforward wiring for the novice and a self build will save much cost. Also used these in a project to pick up light from programmed light patches on monitor using multiple LDRs in a potential divider input - ideal for very many independent outputs - ideal in model railways.