STMicroelectronics STP16CPP05PTR

Overview

STP16CPP05PTR from STMicroelectronics is a 16-bit constant-current LED sink driver in QSOP-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 supply, 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 STP16CPP05PTR datasheet, STP16CPP05PTR pinout, STP16CPP05PTR application, or STP16CPP05PTR equivalent, this device is selected for high-density LED signage, industrial HMI backlighting, and automotive interior lighting where current accuracy (±1.5% between bits), fast 40 ns current setup time, and thermal shutdown at 170 °C are critical design requirements.

Technical Context

The STP16CPP05PTR integrates a 16-bit serial-in/parallel-out shift register cascaded with a 16-bit D-type storage latch, enabling synchronized update of all 16 outputs on LE assertion. Its output stage comprises sixteen matched, thermally compensated current sources - each independently enabled/disabled via serial data and globally controlled by active-low OE.

Current regulation is set externally via R_EXT connected to pin 23, supporting programmable output from 3 mA to 40 mA with ±5% inter-device accuracy at 25 °C. Propagation delays range from 11 ns (CLK→SDO, VDD = 5 V) to 48 ns (OE→OUTn, VDD = 5 V), ensuring timing integrity in high-speed multiplexed LED systems.

Key Specifications

Pinout & Package

STP16CPP05PTR is housed in a 24-pin QSOP package (JEDEC MO-137AC) with 0.635 mm pitch, 8.66 mm × 6.00 mm body, and exposed pad recommended for thermal relief. 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 STP16CPP05PTR offers higher output voltage (20 V vs. 17 V), simpler analog current setting, and superior serial throughput - making it optimal for cost-sensitive, high-voltage LED signage where grayscale is managed externally.

Availability

STP16CPP05PTR is available at Aetrix Electronics and suitable for LED video signage, industrial HMI backlighting, automotive interior lighting, and test equipment status indicators requiring stable component supply and long-term production support.

Supply support for STP16CPP05PTR 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The STP16CPP05PTR belongs to ST's LED driver portfolio targeting high-reliability, low-cost panel display systems - engineered for robustness in continuous-duty LED applications with minimal external components.

FAQ

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

The datasheet specifies R_EXT = 490 Ω yields 38–42 mA output at VDD = 5 V and VO = 1.3 V. Using Ohm's law approximation I ≈ 12.5 V / R_EXT, 490 Ω is the validated minimum; lower values risk exceeding absolute maximum output current (50 mA) and degrading current accuracy or thermal margin.

Can STP16CPP05PTR drive LEDs with forward voltage above 3.3 V?

Yes - its 20 V output voltage rating allows series connection of up to six standard white LEDs (VF ≈ 3.2 V each) or seven red LEDs (VF ≈ 2.8 V). The actual usable string length depends on VDD minus total VF drop; e.g., at VDD = 5 V, max VF sum is 5 V – dropout voltage (~0.37 V at 40 mA) = 4.63 V.

Is the exposed pad on QSOP-24 electrically connected?

Per datasheet Section 1.1 and Figure 19, the exposed pad is not internally connected to any die node and must be either left floating or tied to GND via PCB copper for thermal conduction. Electrical isolation is permitted, but thermal performance improves significantly when soldered to a grounded thermal land.

How does thermal shutdown interact with normal operation?

Thermal shutdown activates at junction temperature ≥170 °C, disabling all outputs until temperature falls below hysteresis threshold (~160 °C). It is not latched - recovery is automatic. In practice, with QSOP-24 R_thJA = 72 °C/W, continuous 40 mA per channel (640 mW dissipation) requires adequate PCB copper area to avoid triggering shutdown at ambient >85 °C.