STMicroelectronics STP16CPP05TTR

Overview

STP16CPP05TTR from STMicroelectronics is a 16-bit constant-current LED sink driver in TSSOP-24 package, designed for serially controlled LED panel displays. It delivers precise 3–40 mA per channel via external R_EXT, supports 3.3 V/5 V logic, features 30 MHz max clock frequency, Schmitt-trigger inputs, and guarantees 20 V output driving capability for multi-LED series strings.

For engineers reviewing the STP16CPP05TTR datasheet, STP16CPP05TTR pinout, STP16CPP05TTR application, or STP16CPP05TTR equivalent, key selection criteria include output current accuracy (±1.5% between bits), thermal shutdown at 170 °C, propagation delays as low as 11 ns (V_DD = 5 V), and compatibility with 3.3 V microcontrollers in high-density LED signage and industrial HMI systems.

Technical Context

The STP16CPP05TTR integrates a 16-bit serial-in/parallel-out shift register cascaded with a 16-bit D-type storage latch, enabling synchronous data loading and output latching. Its output stage comprises sixteen matched, thermally compensated current sources with programmable setpoint via R_EXT.

Operation relies on three control signals: CLK (synchronous data shift), LE (latch enable to freeze output data), and OE (active-low output enable). The device supports daisy-chaining via SDO, maintains 40 ns typical current setup time, and includes ESD protection rated at 2 kV HBM.

Key Specifications

Pinout & Package

TSSOP-24 package with exposed pad (thermally enhanced); 0.65 mm pitch; body size 7.8 × 4.4 mm; recommended PCB land pattern connects exposed pad to ground for optimal thermal performance (R_thJA = 85 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit constant-current LED sink driver applications.

Compared with TB62706CFNG and PCA9635PW, the STP16CPP05TTR offers superior current accuracy (±1.5%), integrated thermal safety, and higher clock tolerance (30 MHz), making it optimal for timing-critical, high-brightness LED panels where hardware-level reliability outweighs protocol flexibility.

Availability

STP16CPP05TTR is available at Aetrix Electronics and suitable for indoor LED video walls, industrial HMI panels, automotive instrument clusters, and point-of-sale display backlights requiring stable component supply across extended production lifecycles.

Supply support for STP16CPP05TTR 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, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.

The STP16CPP05 belongs to ST's LED driver product line, engineered specifically for high-accuracy, low-voltage constant-current sinking in space-constrained display applications with demanding thermal and timing requirements.

FAQ

What is the minimum R_EXT value supported for 40 mA output current?

The STP16CPP05TTR achieves 40 mA per channel with R_EXT = 490 Ω, as confirmed in Table 11 of the datasheet (V_DD = 5 V, I_SET = 40 mA). Using lower resistance risks exceeding absolute maximum output current (50 mA) and may trigger thermal shutdown under sustained load.

Can STP16CPP05TTR drive LEDs directly from a 3.3 V microcontroller without level shifting?

Yes - all digital inputs (SDI, CLK, LE, OE) are 5 V tolerant and feature Schmitt-trigger receivers, allowing direct connection to 3.3 V GPIOs. No level shifter is required, and the device operates natively at 3.3 V supply, simplifying interface design with modern low-voltage MCUs.

How does the exposed pad on the TSSOP-24 package affect thermal performance?

The exposed pad must be soldered to a dedicated PCB copper pour connected to GND. This reduces thermal resistance from junction-to-ambient to 85 °C/W (vs. 37.5 °C/W for exposed-pad variant), enabling continuous 40 mA operation across all 16 channels at +85 °C ambient without derating.

Is daisy-chaining multiple STP16CPP05TTR devices supported in hardware?

Yes - the SDO pin provides bit-shifted serial output synchronized to CLK, allowing up to 16+ devices to be cascaded. However, maximum clock frequency must be reduced in long chains due to cumulative propagation delay; ST recommends ≤20 MHz for 5+ devices to maintain timing margin.