STMicroelectronics STP16C596AXTTR

Overview

STP16C596AXTTR from STMicroelectronics is a 16-bit constant-current LED sink driver in TSSOP24 exposed-pad package, designed for serial-to-parallel LED panel driving with adjustable per-channel current (15–120 mA), 25 MHz clock support, and 16 V output voltage capability. It integrates a 16-bit shift register, D-type latch, and sixteen matched current sources for uniform LED brightness control in signage and display systems.

For engineers reviewing the STP16C596AXTTR datasheet, STP16C596AXTTR pinout, STP16C596AXTTR application, or STP16C596AXTTR equivalent, key selection factors include output current adjustability via R_EXT, daisy-chainable SDO timing on clock falling edge, thermal performance of the exposed pad, and ±3% channel-to-channel current matching at 5 V supply.

Technical Context

The STP16C596AXTTR implements a two-stage architecture: a 16-bit serial-in/parallel-out shift register followed by a 16-bit D-type storage latch, enabling synchronized update of all 16 outputs. Its current regulation uses external resistor R_EXT to set reference current, which is mirrored across all 16 channels with ±3% matching between bits.

Output enable (/OE) and latch (/LE) are active-low control inputs; /OE disables all outputs simultaneously while /LE transfers shift register data to the output latch. Serial data out (SDO) toggles on the falling edge of CLK-reducing skew sensitivity in long daisy chains-and supports cascading up to 25 MHz without timing degradation.

Key Specifications

Pinout & Package

TSSOP24 exposed-pad package (7.7 × 4.4 mm, 0.65 mm pitch) with thermally enhanced copper pad electrically isolated but soldered to PCB for heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB62706CFNG and AL8861SP-13, the STP16C596AXTTR uniquely balances analog current tuning, daisy-chain scalability, and thermal efficiency in a single 24-pin exposed-pad package-making it optimal for cost-sensitive, medium-complexity LED matrix designs requiring stable per-channel current without embedded PWM logic.

Availability

STP16C596AXTTR is available at Aetrix Electronics and suitable for indoor LED signage, industrial HMI panels, architectural lighting control, and test equipment status indicators requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for STP16C596AXTTR 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 STP16C596A belongs to ST's LED driver portfolio targeting high-reliability, thermally constrained display applications-designed specifically for energy-efficient, scalable LED matrix control with minimal external components.

FAQ

What is the function of the exposed thermal pad on the STP16C596AXTTR?

The exposed pad is electrically isolated but must be soldered directly to a PCB copper pour connected to GND for optimal thermal performance. It reduces junction-to-ambient thermal resistance to 37.5 °C/W-2.5× better than standard TSSOP24-enabling sustained 120 mA operation across all 16 channels at +85 °C ambient without derating.

How does the SDO falling-edge timing improve daisy-chain reliability?

SDO transitions on the falling edge of CLK instead of the rising edge, decoupling output data validity from clock propagation delay through long chains. This eliminates setup/hold violations when cascading multiple STP16C596AXTTR devices, allowing stable operation beyond 10 units at 25 MHz without additional timing margin or buffers.

Can the STP16C596AXTTR drive RGB LEDs with independent color control?

No-it provides 16 identical constant-current sinks with shared /OE and /LE control, making it suitable for monochrome or multiplexed displays but not for per-color PWM mixing. For RGB, three separate STP16C596AXTTRs (one per channel) or a dedicated RGB driver like the STP16CP05 would be required to maintain independent current and timing control.

What is the minimum R_EXT value needed to achieve 120 mA output current?

Based on Figure 13 and Table 7, R_EXT = 250 Ω yields I_OUT ≈ 120 mA at V_DD = 5 V. Using lower resistance risks exceeding absolute maximum ratings: R_EXT < 250 Ω may cause excessive die temperature or current-source saturation, especially at elevated ambient temperatures or with all 16 channels active.