Summary
Low Current, High Performance NPN Silicon Bipolar Transistor
Description
Hewlett-Packard’s AT-31011 and AT-31033 are high performance NPN bipolar transistors that have been optimized for operation at low voltages, making them ideal for use in battery powered applications in wireless markets. The AT-31033 uses the 3 lead SOT-23, while the AT-31011 places the same die in the higher performance 4 lead SOT-143. Both packages are industry standards compatible with high volume surface mount assembly techniques.
Source title
AT-31011 Datasheet(PDF) - Agilent(Hewlett-Packard)