16-channel constant-current sink at 40 mA per channel
The STMicroelectronics STP16CPPS05TTR is a linear LED driver IC built around a 16-bit shift register with constant-current sink outputs. Each of the 16 channels delivers up to 40 mA, set by an external resistor, and the output stage handles up to 20 V — enough headroom for multiple series LEDs in a string. The shift register clocks at 30 MHz, which supports PWM dimming or data updates across a multiplexed display without visible flicker. The 24-TSSOP package keeps the footprint compact for dense channel arrays on a sign board or automotive lighting PCB.
The wide range means it holds its current accuracy through a cold start in outdoor signage and through the heat soak near an engine bay or LED headlamp assembly. The constant-current topology itself is linear, so thermal dissipation scales with the voltage drop across the output stage — the 24-TSSOP's exposed pad (if present on the layout) needs a thermal via stitch to keep the junction below the derating threshold when driving all 16 channels near the 40 mA ceiling at high ambient.
Sourcing and lifecycle posture
It is a current-production part from STMicroelectronics, not subject to last-time-buy or obsolescence notices at this time. No official replacement or second-source alternate is recorded in the STP16CPPS05TTR's lifecycle documentation; the part is the standard offering in its family.