Its 490 kHz bandwidth and 5.2 V/µs slew rate let it track current transients in switching power supplies and motor drives without excessive delay, while the 1.6 mA supply current keeps the monitoring circuit from loading the rail in always-on ECU blocks.
What the 490 kHz bandwidth means for the BOM
The -3 dB bandwidth of 490 kHz sets the upper frequency for accurate current measurement. In a 400 kHz switching converter, the amplifier still has enough gain to resolve the inductor current waveform for overcurrent detection or average-current-mode control. If the switching frequency pushes above 500 kHz, the gain roll-off will attenuate the signal — budget a faster current sense (e.g., 1 MHz or higher) for those rails.
The TSC2012IYST comes in an 8-MiniSO package (also listed as 8-TSSOP, 8-MSOP with 0.118" body width, 3.00 mm). Surface-mount only. The 8-MiniSO footprint is shared across several ST current-sense amplifiers, so a layout designed for the TSC2012 can often accept a pin-compatible sibling without a board spin. No exposed pad — thermal dissipation goes through the leads and PCB copper.