Fixed 12V buck-boost, 19 kHz — what that means on the bench
The Analog Devices ADP1108AR-12 is a fixed 12V output step-up/step-down (buck-boost) DC-DC converter in an 8-SOIC package. It takes a 2V to 30V input rail and delivers a regulated positive 12V at its single output, switching at 19 kHz. That switching frequency is the first thing to flag: at 19 kHz it sits right in the audible band, so you will hear the inductor whine unless you pot the board or use a shielded inductor. The buck-boost topology means the output stays at 12V whether the input is above or below 12V — useful for battery-powered gear where the cell voltage drops below the target rail.
Sourcing and lifecycle — still active, but RoHS non-compliant
The ADP1108AR-12 is listed as Active in production — no last-time-buy risk for new builds. The catch is the RoHS compliance status: this part is marked RoHS non-compliant, meaning it contains lead (likely in the solder finish or die attach). If your BOM requires full RoHS compliance for EU markets or green-label programs, this part will not pass. For military, aerospace, or industrial exempt applications where leaded solder is still allowed, it is fine. Sourced and quoted to order through independent distribution; availability and current pricing confirmed at quote time.