This is one Lot (Qty. 10) of New Sipex (Alpha) Precision Shunt Regulator, Trimmed Bandgap to 1%, Part Number: AS4040AM-2 in SOT-23 Package. Newer part number is SPX4040A2M-2.5.

General Spec:

• Reference Voltage: 2.5V
• Voltage Tolerance: 1%
• Wide Operating Current: 100uA to 15mA
• Extended Temperature Range: -40C to +85C
• Low Temperature Coefficent: 30ppm/C
• Replacement Performance for LM4040
• Low Output Noise
• SOT-23 Package

Detail Spec on Web as follows:

http://pdf1.alldatasheet.com/datasheet-pdf/view/46041/SIPEX/SPX4040.html

http://www.datasheetarchive.com/ type AS4040 in search field. Click on pdf download, then click on data sheet picture, then open or save the document.