Power-logic shift register for 5V loads
The Texas Instruments TPIC6C595PWR is an 8-bit serial-to-parallel shift register with open-drain outputs, designed to drive loads directly rather than just signalling. Unlike a standard logic-level 74HC595, this part from the TPIC series integrates power DMOS transistors on each output, making it a fit for driving LEDs, relays, solenoids, or small incandescent lamps from a 5V logic rail. The open-drain output structure means each pin can sink current to ground; the load connects between the output and the positive supply. Operating from a 4.5V to 5.5V supply, the device is a single-element, 8-bit register in a 16-TSSOP package.
The open-drain output is the headline feature that separates this part from a standard shift register. Each of the eight outputs can sink current from an external load — typical applications include driving the cathode side of an LED array or energising a relay coil with a flyback diode. Because the outputs are open-drain, the load supply voltage can differ from the logic supply, as long as the output transistor breakdown voltage is respected. This makes the TPIC6C595PWR a natural choice for multiplexed display panels or any bank of switched loads where the logic runs at 5V and the loads may run at a higher voltage.
ROHS3 compliance is confirmed, so no exemption expiry concerns for European or California-market builds.
Package and supply-chain notes
The 16-TSSOP package (4.40mm width, 0.173" body) is a common footprint shared with many 16-pin logic and interface devices. The 5V-only supply rail is a hard constraint — do not plan to run this from a 3.3V bus without a level translator or a separate 5V regulator.