1.05 GHz buffer — what the scorch mark tells you
The LMH6559MA-TI: With a 1.05 GHz -3dB bandwidth and a 4580 V/µs slew rate, this part is designed to drive capacitive loads, video lines, or ADC inputs without the slew-induced distortion a slower op-amp would leave on the waveform.
4580 V/µs — why that number decides the replacement
The 4580 V/µs slew rate is the headline spec that rules out most general-purpose op-amps as substitutes. A typical video op-amp like the THS4215DRBT runs 970 V/µs — fast, but not in the same class for pulse fidelity or large-signal bandwidth. If the board originally used the LMH6559MA-TI to buffer a fast DAC output or a radar pulse, dropping in a 970 V/µs part will round the edges and shift the timing budget. The 1.05 GHz bandwidth reinforces the same message: this is a wideband buffer, not a precision amplifier.
Active lifecycle, RoHS caveat
This variant is listed as RoHS non-compliant. If your assembly requires RoHS exemption-free material, verify the date code or check the lead-free suffix variant.
Sourcing and fit for the BOM line
If you are repairing a board and the original LMH6559MA-TI is the scorched IC, the active status and standard SOIC footprint make it a straightforward swap — no pinout detective work.