16-channel constant-current sink with shift register
The TLC59281DBQR is a linear LED driver from Texas Instruments that integrates a 35 MHz shift register and 16 constant-current sink outputs, each rated for 35 mA. It operates from a 3 V to 5.5 V supply and drives LEDs with an output voltage rating of 17 V. The internal switches eliminate external driver transistors, saving board space in multiplexed or direct-drive LED arrays. Typical applications include industrial panel indicators, signage, and telecom equipment status lights where a serial interface reduces I/O count on the host controller.
35 mA per channel — what it means for the BOM
Each of the 16 outputs sinks 35 mA continuously, enough to drive standard through-hole or SMD LEDs at full brightness without external current-setting resistors. The constant-current regulation holds the LED current steady across supply and temperature shifts, so the BOM can skip per-channel ballast resistors. If your design needs more than 35 mA per channel, this part is not the fit — look at a higher-current sink driver or add an external transistor stage.
35 MHz shift clock — update rate and bus timing
The 35 MHz shift register clock updates all 16 outputs. The serial interface daisy-chains for multiple devices.
Industrial temperature range and package
Rated for -40°C to 85°C ambient, the TLC59281DBQR fits outdoor telecom cabinets, factory-floor HMI panels, and unconditioned enclosures. The 24-SSOP package (3.90 mm body width) is a common footprint for serial-input LED drivers; it routes easily on a two-layer board. The surface-mount package suits automated assembly lines, and the ROHS3 compliance avoids restricted-substance restrictions in EU and other regulated markets.
Sourcing and lifecycle
That means no last-time-buy pressure for new designs or ongoing BOMs. The ROHS3 compliance is current, so no exemption expiry to track for European markets.