The LTC6401CUD-26#PBF is an ADC driver from Linear Technology, built to condition analog signals before they hit a data converter. It's a single-channel part in a 16-WFQFN exposed pad package (3x3 mm), surface-mount only. The "-26" suffix denotes a specific gain or bandwidth variant within the LTC6401 family — the datasheet gives the exact transfer function. This is a current-production part, still active on the line.
Package and layout — the 3x3 mm QFN
The 16-WFQFN with exposed pad measures 3x3 mm. That small footprint is a double-edged sword: it saves board space, but the thermal pad under the package needs a solid via stitch to the ground plane to pull heat out. No lab bench required for the swap, but the QFN is a hot-air or reflow-only package — don't plan on hand-soldering this in the field. The exposed pad also serves as the primary thermal path; without it, the part derates quickly above 85°C ambient.
Sourcing reality — active, quoted to order
Linear Technology (now part of Analog Devices) lists the LTC6401CUD-26#PBF as Active. That means it's still in the factory's standard product portfolio, not a phase-out candidate. We source it through independent distribution and quote firm pricing against an RFQ — no stock count to publish here, but availability and current price are confirmed at quote time. For volume or scheduled releases, the lead time is part of the quote.