STMicroelectronics STP16CP05B1R

Overview

STP16CP05B1R from STMicroelectronics is a 16-channel constant-current LED sink driver IC with serial-in/parallel-out shift register architecture, designed for LED panel displays. It delivers adjustable output current (5–100 mA per channel), supports 3.3 V microcontroller interfacing, operates up to 30 MHz clock frequency, and provides 20 V output driving capability for series-connected LEDs.

For engineers reviewing the STP16CP05B1R datasheet, STP16CP05B1R pinout, STP16CP05B1R application, or STP16CP05B1R equivalent, key selection considerations include per-channel current accuracy (±1.5% between bits), thermal performance in TSSOP24 exposed pad package, latch and output enable timing behavior, and R-EXT resistor-based current programming.

Technical Context

The device integrates a 16-bit serial-in, parallel-out shift register cascaded with a 16-bit D-type storage latch, enabling synchronized data loading and output updating. Its output stage uses sixteen matched regulated current sources, each controlled by an external R-EXT resistor to set full-scale current from 5 mA to 100 mA.

Control logic is level-sensitive: LE/DM1 latches new data on high level (not edge-triggered), while OE/DM2 enables/disables all outputs low-active. Propagation delays are voltage-dependent-e.g., CLK-to-OUTn delay is 24 ns (typ.) at VDD = 5 V-and output rise/fall times are under 32 ns (VDD = 5 V), supporting high-refresh-rate LED multiplexing.

Key Specifications

Pinout & Package

The STP16CP05B1R is packaged in TSSOP24 with exposed pad (ECOPACK® compliant), offering 37.5 °C/W junction-to-ambient thermal resistance when the pad is soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-channel constant-current LED driver applications.

Compared with TLC59283RTJR and IS31FL3731-QFLS4-TR, the STP16CP05B1R offers superior daisy-chain scalability and lower latency for high-speed LED scanning, but requires external PWM generation and lacks integrated grayscale memory.

Availability

STP16CP05B1R is available at Aetrix Electronics and suitable for indoor LED video walls, automotive interior lighting control, industrial panel meters & HMI displays, and architectural LED strip drivers requiring stable component supply and long-term production continuity.

Supply support for STP16CP05B1R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.

The STP16CP05B1R belongs to ST's LED driver product line, engineered specifically for high-reliability, high-density LED panel applications where precision current matching, thermal efficiency, and daisy-chain expandability are critical design requirements.

FAQ

What is the minimum recommended R-EXT value for 100 mA output current?

The datasheet specifies that 100 mA per channel is achieved with R-EXT = 200 Ω at VDD = 5 V. Using a lower resistance risks exceeding absolute maximum ratings and degrading current accuracy due to increased power dissipation in the internal current mirror. The 200 Ω value is validated for stable operation across temperature and process variation.

Can STP16CP05B1R drive LEDs directly from a 24 V supply rail?

No-the STP16CP05B1R is a sink driver with 20 V maximum output voltage rating (VO), meaning it can only withstand up to 20 V between OUTx and VDD. To use with a 24 V LED string, a 4 V dropping element (e.g., series resistor or LDO) must be placed between VDD and the LED anodes, or the device must be powered from a ≤20 V rail referenced to the LED string's high side.

How does the LE/DM1 latch function differ from standard shift-register output registers?

Unlike edge-triggered output registers, LE/DM1 is level-sensitive: when held high, it continuously updates the output latch with new data from the shift register, enabling real-time streaming without discrete latch pulses. This simplifies timing-critical applications like video wall scanning, where data and latch signals can be aligned to pixel clock boundaries rather than requiring precise pulse-width generation.

Is thermal pad connection mandatory for STP16CP05B1R in TSSOP24 exposed pad package?

Yes-the exposed pad must be electrically connected to a PCB copper land (typically tied to GND) to achieve the specified 37.5 °C/W thermal resistance. Without this connection, R_thJA degrades to 55 °C/W, limiting safe continuous output current to ~60 mA/channel at TA = 85 °C and risking thermal shutdown above 170 °C junction temperature.