Buffer amp for signal conditioning and line driving
The STMicroelectronics TSH122ICT is a single-channel buffer amplifier in a tiny SC-70-6 package, designed for applications where a low-output-impedance, high-current drive stage is needed after a sensor, DAC, or filter. Its 9.5 MHz -3dB bandwidth covers video baseband and fast ADC input buffers, while the rail-to-rail output preserves signal swing on a single 2.25V to 5V supply. Each channel can deliver 75 mA, enough to drive a 32-ohm headphone or a long coaxial cable directly, saving a separate line-driver IC.
The 2.25V to 5V supply range lets this part run from a single Li-ion cell (nominal 3.6V) or a regulated 3.3V or 5V rail without a secondary LDO. Quiescent current is 2 mA, which is moderate — fine for line-powered or battery gear that isn't on a strict sleep budget. The 75 mA output per channel is unusually high for a buffer in this package class; it means the part can sink or source enough current to drive a video line (75-ohm back-terminated) or a small speaker directly. Rail-to-rail output ensures the signal doesn't clip early at low supply voltages, giving the full 2.25V to 5V swing into a high-impedance load.
Package and mounting — SC-70-6 footprint
The TSH122ICT comes in an SC-70-6 package, also known as 6-TSSOP or SOT-363. It's a surface-mount part with a 2.0 mm x 2.1 mm body and 0.65 mm pitch — small enough for compact PCBs but still hand-solderable with a fine tip and magnification. The supplier device package is SC-70-6; the alternate case codes (6-TSSOP, SC-88, SOT-363) are the same footprint, so any of those land patterns work. No exposed pad, so thermal dissipation is through the leads only — keep the ambient below 85°C if driving 75 mA continuously.