The Texas Instruments OPA391DCKR is a single-channel, general-purpose CMOS op-amp from the e-trim™ series, housed in a 5-pin SC-70-5 (SOT-353) package for surface-mount assembly. It delivers a 1 MHz gain-bandwidth product with a 1 V/µs slew rate, rail-to-rail output swing, and an input offset voltage trimmed to 15 µV. The part operates from a 1.7 V to 5.5 V supply span, drawing only 24 µA quiescent current.
The 0.01 pA input bias current means negligible voltage drop across high source impedances, making the OPA391DCKR a natural fit for photodiode transimpedance amplifiers or electrochemical sensor front-ends. The 24 µA supply current keeps the power budget tight in always-sensing nodes; at 1.7 V minimum supply, the part can run directly from a single lithium coin cell without a boost converter. Rail-to-rail output preserves signal swing at low supply rails, critical for single-supply ADCs with full-scale inputs. The 60 mA output current capability gives enough drive for reference buffers or small relays.
Packaging and mounting
The SC-70-5 (SOT-353) footprint is a compact 5-lead package. Surface-mount assembly fits standard reflow profiles.
That means it remains a current-production line item for new designs. For dual-sourcing flexibility, the TLV9351IDCKR is a functional alternative in the same SC-70-5 package — it offers a wider 3.5 MHz GBW but draws 600 µA supply current, so the trade-off is bandwidth versus power.