Dual CMOS op-amp for low-power sensor signal conditioning
The TC75W55FK(TE85L,F): The TC75W55FK is a dual-channel CMOS operational amplifier from Toshiba, designed for battery-powered sensor interfaces and portable instrumentation where supply current is the primary constraint. Each amplifier draws 20 µA typical supply current, and the pair operates from a single supply rail between 1.8 V and 7 V.
The 160 kHz gain-bandwidth product sets the closed-loop bandwidth at a given gain: at gain 100, expect roughly 1.6 kHz of usable bandwidth. The 0.08 V/µs slew rate limits large-signal response — a 1 V step slews in about 12.5 µs, which is fine for DC measurement but too slow for audio or fast ADC driving. The picoamp-level bias makes the part suitable for high-impedance sources like pH probes or piezoelectric sensors without needing a separate JFET buffer. The 2 mV offset is typical for a general-purpose CMOS stage — budget for system calibration if the signal chain requires sub-millivolt accuracy.
The part is RoHS compliant. The 8-VFSOP package is a standard Toshiba footprint, and the supplier device package is 8-SSOP — the two designations refer to the same body outline, so PCB footprints are interchangeable.
8-VFSOP package — rework and footprint notes
The 8-VFSOP package measures 0.091" (2.30 mm) body width with a 0.50 mm lead pitch. The narrow pitch means the solder stencil apertures should be sized to avoid bridging — a 0.25 mm stencil thickness with 1:1 aperture-to-pad ratio is a safe starting point. Rework with hot air is feasible: the small thermal mass reflows quickly at 240–260 °C peak, but the fine pitch demands careful alignment.