STMicroelectronics STP16C596XTTR

Overview

STP16C596XTTR from STMicroelectronics is a 16-bit constant-current LED sink driver in TSSOP-24 exposed-pad package, designed for serially controlled LED panel displays. It delivers adjustable 15–120 mA per channel via external R_EXT, supports 25 MHz clock input, provides 16 V output voltage capability, and features daisy-chainable serial-out on clock falling edge for skew-tolerant cascading.

For engineers reviewing the STP16C596XTTR datasheet, STP16C596XTTR pinout, STP16C596XTTR application, or STP16C596XTTR equivalent, key selection criteria include per-channel current adjustability, thermal performance of the exposed-pad TSSOP, propagation delay timing (t_PLH1 ≤ 280 ns), latch/enable control logic, and compatibility with high-density LED signage and industrial HMI backlighting.

Technical Context

The device integrates a 16-bit serial-in/parallel-out shift register feeding a 16-bit D-type storage latch, enabling synchronous data loading and output latching. Output stage comprises sixteen matched, thermally stable current sources with ±3% inter-channel accuracy at V_O ≥ 0.7 V and R_EXT = 910 Ω.

Serial output transitions on the falling edge of CLK - a deliberate architecture choice to mitigate timing skew in multi-device daisy chains. The exposed thermal pad reduces R_thJA to 37.5 °C/W, enabling sustained operation at full 120 mA/channel under +125 °C ambient when properly soldered to PCB copper.

Key Specifications

Pinout & Package

TSSOP-24 with exposed thermal pad (electrically unconnected); requires soldering to PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC59283RTJR and IS31FL3728-QFLS4-TR, the STP16C596XTTR uniquely balances high-speed serial throughput, hardware-level blanking, and analog current tuning - making it optimal for cost-sensitive, high-reliability LED video systems where deterministic timing and thermal robustness are non-negotiable.

Availability

STP16C596XTTR is available at Aetrix Electronics and suitable for LED video signage, industrial HMI backlighting, medical status indicators, and automotive interior lighting requiring stable component supply across extended production lifecycles.

Supply support for STP16C596XTTR 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STP16C596XTTR belongs to ST's LED driver portfolio targeting high-density, high-reliability display systems - engineered specifically for thermal resilience in continuous-duty LED panel applications with minimal external components.

FAQ

What is the minimum recommended R_EXT value for 120 mA operation?

The datasheet specifies R_EXT = 104 Ω for nominal 120 mA output (I_OUT ≈ 12.5 V / R_EXT). At V_DD = 5.0 V and T = 25°C, this yields 120.2 mA typical. Use 1% metal-film resistor with 0.125 W rating; verify thermal derating at elevated ambient temperatures using Figure 14.

Can STP16C596XTTR drive LEDs directly from a 12 V supply?

No - VDD must be 4.5–5.5 V for logic operation. The 16 V output compliance refers to the maximum voltage the OUT pins can withstand above GND while sinking current. LED anodes connect to +12 V, cathodes to OUT pins; the IC only handles the current-sink path, not the supply rail.

How does the exposed thermal pad affect PCB layout requirements?

The exposed pad must be soldered to a minimum 200 mm² copper pour tied to GND with ≥4 thermal vias (0.3 mm diameter, filled or capped). Failure to do so raises junction temperature by >40°C at full load, risking current drift and accelerated parametric failure per Figure 14.

Is the SDO output compatible with 3.3 V logic systems?

Yes - SDO is CMOS-compatible with VOH ≥ VDD − 0.4 V and VOL ≤ 0.4 V. When VDD = 5.0 V, VOH ≥ 4.6 V, which exceeds 3.3 V logic high threshold. For direct interfacing to 3.3 V receivers, add a 10 kΩ pull-down on SDO to prevent floating during power-up sequencing.