STMicroelectronics STP16CL596M

Overview

STP16CL596M from STMicroelectronics is a 16-bit constant-current LED sink driver in SO-24 package, designed for serial-in/parallel-out LED panel driving with adjustable per-channel current (15–90 mA), 25 MHz clock support, and 16 V output voltage capability. It operates from 3.0–3.6 V supply and features daisy-chainable serial output synchronized to falling clock edges.

For engineers reviewing the STP16CL596M datasheet, STP16CL596M pinout, STP16CL596M application, or STP16CL596M equivalent, key selection criteria include output current programmability via R_EXT, thermal performance in SO-24 vs. exposed-pad TSSOP variants, latch timing (≥20 ns LE pulse width), and guaranteed 16 V sink voltage headroom for multi-LED series strings.

Technical Context

The device integrates a 16-bit shift register cascaded to a D-type storage latch, enabling synchronous data loading and output updating. Output enable (OE) is active-low and controls all 16 channels simultaneously, while latch enable (LE) determines whether new data propagates to outputs or is held.

Each of the 16 output channels uses an internally regulated current source referenced to an external resistor (R_EXT), delivering ±3% channel-to-channel current matching at 0.7 V compliance and ±10% unit-to-unit accuracy. Serial output (SDO) toggles on CLK falling edge-critical for skew-tolerant daisy chaining in large LED arrays.

Key Specifications

Pinout & Package

STP16CL596M is supplied in a standard SO-24 (Small Outline, 24-pin) plastic package with 1.27 mm pitch, 15.2–15.6 mm body length, and 10.0–10.65 mm width. The package is RoHS-compliant and ECOPACK® certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC59283RTJR and MAX6966ATL+, the STP16CL596M offers superior current matching (±3% vs. ±6–8%), simpler biasing (single R_EXT), and deterministic timing for high-speed daisy chains-making it optimal for cost-sensitive, high-uniformity LED panel designs where MCU resources are constrained.

Availability

STP16CL596M is available at Aetrix Electronics and suitable for LED video walls, industrial HMIs, automotive interior lighting, and architectural LED strips requiring stable component supply and long-term manufacturability.

Supply support for STP16CL596M 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 microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STP16CL596 belongs to ST's LED driver product line, engineered specifically for high-density, low-voltage LED display systems where precision current matching, thermal efficiency, and daisy-chain reliability are critical.

FAQ

What is the minimum recommended R_EXT value and its impact on thermal performance?

The datasheet specifies R_EXT = 250 Ω as a practical lower limit, yielding ~14.1 mA supply current per channel ON (IDD(ON2)). At this setting, total power dissipation reaches ~0.7 W in SO-24 (R_thJA = 75 °C/W), raising junction temperature ~53 °C above ambient. For continuous operation above 85 °C ambient, derating or forced airflow is advised.

Can STP16CL596M drive LEDs directly from a 5 V supply?

No - STP16CL596M is rated for VDD = 3.0–3.6 V only. Applying 5 V exceeds absolute maximum rating (VDD ≤ 7 V is stressed, but electrical characteristics are not guaranteed beyond 3.6 V). Operation at 5 V risks parametric shift, reduced lifetime, or latch-up. Use a dedicated 3.3 V regulator or select a 5 V–compatible driver like STP16CP05.

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

Because SDO changes on the falling edge of CLK, downstream devices sample valid data during the subsequent rising edge - effectively adding one full clock period of setup margin. This tolerance absorbs PCB trace-length mismatches and clock skew up to several nanoseconds, preventing bit errors in chains exceeding 10+ devices - a common failure mode in large LED cabinets.

Is the exposed pad on TSSOP variants electrically connected?

No - per datasheet Table 2 note, the exposed pad on TSSOP24 (exposed pad) variants is electrically unconnected. Its sole function is thermal conduction: soldering it to a PCB copper pour reduces R_thJA from 85 °C/W to 37.5 °C/W, enabling ~2× higher continuous output current before thermal throttling.