STMicroelectronics STP16CP596M

Overview

STP16CP596M from STMicroelectronics is a 16-bit constant-current LED sink driver in SO-24 package, designed for serially controlled LED panel displays. It delivers adjustable 3–50 mA per channel via external R_EXT, supports 25 MHz clock input, and operates from 3.0–5.5 V supply with 16 V output voltage capability-enabling driving of multiple LEDs in series in signage and display applications.

For engineers reviewing the STP16CP596M datasheet, STP16CP596M pinout, STP16CP596M application, or STP16CP596M equivalent, key selection criteria include output current adjustability, thermal resistance (75 °C/W), latch/enable timing control, and compatibility with 3.3 V microcontrollers in high-density LED systems.

Technical Context

The device integrates a 16-bit serial-in/parallel-out shift register cascaded to a 16-bit D-type storage latch, enabling synchronized data loading and output updating. Output stage uses sixteen matched current-regulated sinks, each programmable via a single external resistor connected to R-EXT pin.

Control logic features active-low output enable (OE), positive-edge clock (CLK), and latch-enable (LE) that transfers shift register contents to outputs on rising edge. Serial data out (SDO) updates on falling clock edges, supporting daisy-chained configurations without additional buffering.

Key Specifications

Pinout & Package

STP16CP596M is supplied in SO-24 (Small Outline, 24-pin) package with standard 1.27 mm pitch and gull-wing leads. The exposed pad variant (STP16CP596XTTR) is not applicable to this orderable part.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED sink driver applications.

Compared with TLC5916IPW and STP16DP05PTR, the STP16CP596M offers optimal balance of channel count, external current control, and SO-24 manufacturability - making it ideal for cost-sensitive, medium-brightness LED panels where design reuse and PCB footprint consistency matter.

Availability

STP16CP596M is available at Aetrix Electronics and suitable for LED signage, industrial HMIs, architectural lighting controls, and test equipment front panels requiring stable component supply and long-term production continuity.

Supply support for STP16CP596M 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The STP16CP596 belongs to ST's LED driver product line, engineered specifically for energy-efficient, high-reliability LED panel systems where uniform current delivery and serial controllability are essential.

FAQ

What is the maximum number of STP16CP596M devices that can be daisy-chained?

There is no hard limit imposed by the IC itself; practical chaining depth depends on total propagation delay and clock rise/fall time integrity. With 25 MHz clock and typical PCB trace lengths, up to 8–12 devices can be reliably cascaded before timing margins degrade. Each adds ~50 ns SDO-to-SDI delay, so system-level timing analysis is required beyond 6 devices.

Does STP16CP596M support PWM dimming?

STP16CP596M does not integrate PWM circuitry. It provides constant-current DC drive only. Dimming is implemented externally by pulsing the LE or OE pins with MCU-generated PWM signals. OE-based blanking yields faster response (<200 ns turn-off), while LE-based latching enables smoother frame updates but requires precise timing alignment.

Can STP16CP596M drive 5 V logic-level LEDs directly?

No - STP16CP596M is a sink driver: its outputs connect to LED cathodes, requiring the anodes to be tied to a positive supply (e.g., 5 V, 12 V, or up to 16 V). It cannot source current. To drive "5 V logic-level LEDs", the LED anode must be connected to ≥5 V, and the IC sinks current from cathode to GND, with V_DD powering only the logic section (3.0–5.5 V).

What is the recommended decoupling for STP16CP596M?

A minimum of 100 nF X7R ceramic capacitor placed within 2 mm of VDD and GND pins is required. For systems with >8 devices or high-frequency switching, add a 4.7 µF tantalum or polymer capacitor per 4 ICs near the power rail entry point. Avoid shared vias between VDD and GND decoupling paths to prevent ground bounce during simultaneous output transitions.