What it is and where it fits
The Analog Devices MAX6921AWI+ is a vacuum fluorescent (VF) display tube driver that takes a 4-wire serial input and drives the high-voltage grid and anode segments of a VFD panel. The supply range spans 8V to 76V, which covers the typical anode voltage needed for most single- and multi-digit VFD tubes without an external boost converter. The driver sits between a host MCU (or serial controller) and the VFD tube, handling the level shift from logic-level signals to the tube's high-voltage drive requirements. Operating temperature covers -40°C to +125°C. The 28-SOIC package with 0.295-inch body width (7.50 mm) is a surface-mount footprint.
Supply range and current draw
The 8V to 76V supply input is the headline rating for this part — it determines whether the MAX6921AWI+ can directly power the VFD tube's anode supply or needs an intermediate regulator. At 76V max, it handles most standard VFD tubes (typically 12V to 70V anode). Supply current is 1.65 mA typical, which is low enough that multiple drivers on a single high-voltage rail won't stress the bias supply. Watch the total current draw if driving a multi-digit panel with several drivers paralleled.
Package and mounting
Supplied in a Tube, the 28-SOIC wide-body package (0.295-inch, 7.50 mm width) is a surface-mount footprint. The supplier device package is listed as 28-SOIC.
Lifecycle and compliance
ROHS3 compliant. No NRND or last-time-buy dates have been issued. No pin-compatible second source is listed.