What this silicon oscillator does on your board
The Analog Devices LTC6900CS5#TRMPBF is a programmable silicon oscillator that replaces ceramic resonators, crystals, or larger oscillator modules in timing applications. It generates a square-wave clock output from 1 kHz up to 20 MHz, set by a single external resistor — no external timing capacitor needed. The part runs from a 2.7 V to 5.5 V supply rail, drawing 920 µA typical, making it a drop-in for both 3.3 V and 5 V digital systems. Housed in a TSOT-23-5 package, it fits tight board layouts where a crystal plus load caps won't.
Supply range and current — sizing the rail
At 920 µA typical supply current, the LTC6900 adds negligible load to a 3.3 V LDO or a 5 V switching regulator — useful when budgeting power for a sensor node or a control board that already runs hot. The wide supply tolerance also means the oscillator keeps running through a 5 V rail drooping to 3.3 V during a brown-out event, as long as the downstream logic can tolerate the frequency shift.
No extended temp or AEC-Q100 grade here — if you need -40°C to 125°C, look at the LTC6908HS6-1#TRMPBF sibling.
Package and footprint — board fit
The TSOT-23-5 footprint is a standard 5-pin SOT-23 thin outline.
Active status — no LTB surprise
ADI lists the LTC6900CS5#TRMPBF as Active and ROHS3 compliant. No last-time-buy notice, no end-of-life window to track. For dual-source planning, the LTC6902CMS#TRPBF is a close functional peer — same 20 MHz ceiling, same 2.7 V min supply, same industrial temp range, in an MSOP-10 package (larger footprint).
If you need a reel of 500 or a cut-tape sample, the TR/CT packaging options are both orderable.