STMicroelectronics STP08CP05TTR

Overview

STP08CP05TTR from STMicroelectronics is an 8-bit serial-in, parallel-out constant-current LED driver shift register in TSSOP-16 exposed pad package, delivering 5–100 mA per channel with ±1.5% inter-channel current accuracy at ≥1.3 V output, 30 MHz clock support, and 3.3 V logic compatibility - designed for high-density LED panel displays requiring precise brightness control and thermal robustness.

For engineers reviewing the STP08CP05TTR datasheet, STP08CP05TTR pinout, STP08CP05TTR application, or STP08CP05TTR equivalent, key selection criteria include adjustable constant-current programming via R_EXT, active-low OE dimming control (0–100% intensity), 20 V output voltage capability for series LED strings, and thermal resistance of 37.5 °C/W enabled by the soldered exposed pad.

Technical Context

The STP08CP05 integrates an 8-bit shift register cascaded to an 8-bit D-type storage latch, enabling synchronous data loading and output latching. Its output stage uses eight matched, thermally stable current sources - each programmable via a single external resistor (R_EXT) - with typical current setup time of 11 ns and guaranteed 20 V sink capability per channel.

It operates from 3.0 V to 5.5 V supply, supports 3.3 V microcontroller interfaces directly, and features built-in thermal protection that disables outputs only above 170 °C. The TSSOP-16 exposed pad package reduces junction-to-ambient thermal resistance by 2.5× versus standard TSSOP, critical for sustained LED drive in compact layouts.

Key Specifications

Pinout & Package

TSSOP-16 exposed pad package with 0.65 mm pitch; exposed thermal pad must be soldered to PCB copper for optimal thermal performance (R_thJA = 37.5 °C/W). Pin 1 marked by dot; pin 16 = VDD; pin 1 = GND; exposed pad = electrically isolated or connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC5916IDR, STP08CP05TTR offers simpler hardware integration and lower system cost for fixed-brightness LED matrices; compared with AL8861SP-13, it provides integrated multi-channel serialization but requires external current-setting resistors and does not regulate input voltage.

Availability

STP08CP05TTR is available at Aetrix Electronics and suitable for LED video walls, industrial HMIs, and architectural lighting systems requiring stable component supply, thermal resilience, and precise current matching across multiple outputs.

Supply support for STP08CP05TTR 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 microcontrollers for industrial, automotive, and consumer markets.

The STP08CP05 belongs to ST's LED driver portfolio targeting high-reliability, thermally constrained LED display applications - engineered for uniform current delivery, low-voltage compatibility, and seamless integration into serial-driven panel architectures.

FAQ

What is the minimum recommended R_EXT value for STP08CP05TTR, and why?

The minimum recommended R_EXT is 190 Ω, which sets maximum output current to 100 mA per channel. Using lower resistance risks exceeding absolute maximum ratings: output current >100 mA may cause thermal overload or violate SOA limits, especially without adequate PCB copper for the exposed pad. Data sheet Table 7 confirms 97–103 mA at 190 Ω with 1.3 V output.

Can STP08CP05TTR drive LEDs with forward voltages exceeding 5 V per string?

Yes - STP08CP05TTR guarantees 20 V output voltage capability per channel, enabling series strings of up to six 3.2 V white LEDs (19.2 V total) or seven 2.8 V red LEDs (19.6 V). This is validated in Absolute Maximum Ratings (Table 4: VO = −0.5 to 20 V) and supported by 20 V-rated output transistors in the internal schematic.

How does the exposed thermal pad affect PCB layout requirements?

The exposed pad must be soldered to a dedicated PCB copper area connected to GND or left electrically isolated but thermally coupled - either way, it requires ≥4 thermal vias (0.3 mm diameter) to an inner ground plane. Failure to do so raises R_thJA from 37.5 °C/W to ~140 °C/W, risking thermal shutdown at >300 mW total dissipation, per Thermal Data Table 5.

Is STP08CP05TTR compatible with 1.8 V logic-level microcontrollers?

No - STP08CP05TTR inputs (SDI, CLK, LE, OE) require VIH ≥ 0.7 × VDD (min 2.1 V at VDD = 3.0 V) and VIL ≤ 0.3 × VDD (max 0.9 V). A 1.8 V MCU cannot reliably drive these thresholds; level-shifting (e.g., TXB0108) or use of 3.3 V MCU is required, as confirmed in Table 6 Recommended Operating Conditions.