Single-supply high-speed buffer in a SOT-23-5
The rail-to-rail output stage maximizes dynamic range at low supply voltages, and the 125 mA output current per channel can drive a 75 Ω video line or multiple ADC inputs directly.
A 210 V/µs slew rate means this part can reproduce a 10 MHz full-scale sine wave with less than 1% distortion, so it handles video (NTSC/PAL at 6 MHz) and high-speed data converters without slewing artifacts. The 240 MHz -3 dB bandwidth gives enough gain margin for a closed-loop gain of 10 at 24 MHz, which covers most high-speed ADC front-end requirements. If your design needs to settle a 10 V step to 0.1% in under 100 ns, this part delivers that margin.
Rail-to-rail output means the output swings within a few millivolts of each rail, preserving dynamic range in low-voltage systems. Input common-mode range extends from the negative rail to about 1 V below the positive rail — fine for single-supply ground-referenced signals, but if you need true rail-to-rail input, that is not this part. The 2 pA input bias current suits high-impedance sources like photodiodes or pH probes without adding offset from bias current.
Temperature range and operating environment
The SOT-23-5 package keeps board area small and is compatible with standard reflow profiles. MSL 1 out of the bag — no bake required before reflow if the pouch seal is intact.
Lifecycle and sourcing
ADI lists the ADA4891-1ARJZ-RL as an active product with no announced end-of-life. It is ROHS3 compliant and available through independent distribution. For a production BOM line, this part carries no imminent LTB risk and is suitable for new designs.