STMicroelectronics STP16C596ATTR

Overview

STP16C596ATTR from STMicroelectronics is a 16-channel constant-current LED sink driver IC in TSSOP-24 exposed-pad package, designed for serially controlled LED panel displays. It delivers adjustable output current (15–120 mA per channel), supports 25 MHz clock frequency, provides 16 V output voltage capability, and features daisy-chainable serial-out on clock falling edge for skew-tolerant cascading.

For engineers reviewing the STP16C596ATTR datasheet, STP16C596ATTR pinout, STP16C596ATTR application, or STP16C596ATTR equivalent, key selection criteria include per-channel current accuracy (±3% between bits), thermal performance of the exposed-pad TSSOP package (R_thj-amb = 37.5 °C/W), latch timing (15 ns setup/hold), and /OE-controlled global output enable with active-low logic.

Technical Context

The STP16C596A integrates a 16-bit serial-in/parallel-out shift register followed by a 16-bit D-type storage latch, enabling synchronous data loading and output latching. Its output stage uses sixteen matched, externally programmable current sources-each regulated via R_EXT-to drive LEDs with precise current matching.

It operates with supply voltage from 4.5 V to 5.5 V, guarantees 16 V output swing per channel, and supports cascade operation up to 25 MHz while maintaining propagation delays under 280 ns (CLK-to-OUT) and 30 ns (CLK-to-SDO). The exposed thermal pad must be soldered to PCB for rated thermal performance.

Key Specifications

Pinout & Package

TSSOP-24 package with thermally enhanced exposed pad (electrically unconnected); 0.65 mm pitch, 7.7 × 4.4 mm body size, 1.05 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB62706CFNG and AL8862SP-13, the STP16C596ATTR uniquely combines 120 mA per channel, 25 MHz operation, daisy-chain SDO, and thermally enhanced packaging-making it optimal for high-brightness, high-density, and thermally constrained LED panel systems where timing integrity and uniformity are critical.

Availability

STP16C596ATTR is available at Aetrix Electronics and suitable for LED video wall panels, industrial HMI displays, automotive dashboard clusters, and point-of-sale display modules requiring stable component supply and long-term production continuity.

Supply support for STP16C596ATTR 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, delivering innovative solutions across automotive, industrial, power, and embedded markets since 1987.

The STP16C596A belongs to ST's LED driver product line, engineered specifically for high-reliability, thermally demanding LED display applications-emphasizing current precision, cascade robustness, and extended temperature operation.

FAQ

What is the function of the exposed thermal pad on the STP16C596ATTR package?

The exposed pad is a non-electrical thermal interface designed to enhance heat dissipation from the die to the PCB. It must be soldered directly to a large copper pour or thermal plane to achieve the specified 37.5 °C/W junction-to-ambient thermal resistance. Leaving it unconnected degrades thermal performance by over 2.5× and risks thermal shutdown under sustained 120 mA/channel load.

How does the SDO falling-edge behavior improve system timing in daisy-chained configurations?

The SDO output toggles on the falling edge of CLK-while data is sampled on the rising edge-creating inherent skew tolerance. In long chains, clock signal delay causes rising edges to arrive later at downstream devices; because SDO changes *after* sampling, downstream devices still receive valid data before their next rising edge, preserving setup time margins without requiring matched trace lengths.

Can the STP16C596ATTR drive RGB LEDs with independent color control?

No-it provides only 16 identical constant-current sinks with global current setting via R_EXT. All channels share the same current magnitude and switching timing. For RGB control, three separate STP16C596ATTRs (one per color channel) or a dedicated RGB LED driver with per-channel current DACs would be required to manage differing forward voltages and brightness targets.

What is the minimum /OE pulse width required to ensure reliable global output disable?

The datasheet specifies a minimum /OE pulse width of 400 ns under recommended operating conditions (V_DD = 4.5–5.5 V). This ensures the internal output stage fully transitions to high-impedance state across all 16 channels. Shorter pulses may result in partial or delayed disable, causing visible LED ghosting or leakage current in safety-critical off-states.