STMicroelectronics STP16CP05XTTR

Overview

STP16CP05XTTR from STMicroelectronics is a 16-channel constant-current LED sink driver in TSSOP-24 exposed pad package, designed for serially controlled LED panel displays. It features adjustable output current (5–100 mA per channel via R_EXT), 30 MHz max clock frequency, 20 V output voltage capability, and 3.3 V microcontroller compatibility - enabling high-density, high-brightness signage and industrial status indicators.

For engineers reviewing the STP16CP05XTTR datasheet, STP16CP05XTTR pinout, STP16CP05XTTR application, or STP16CP05XTTR equivalent, key selection criteria include output current accuracy (±1.5% between bits at 25 °C), thermal resistance (37.5 °C/W with exposed pad soldered), propagation delay (as low as 10 ns at 5 V), and OE/LE timing independence from CLK edge - critical for synchronized multi-device LED matrix control.

Technical Context

The device integrates a 16-bit serial-in/parallel-out shift register cascaded to a 16-bit D-type storage latch, with independent level-sensitive LE/DM1 (latch enable) and OE/DM2 (output enable) inputs. Its output stage uses sixteen matched current-regulated sinks, each programmable via a single external resistor (R_EXT) connected to pin 23.

Timing behavior is defined by asynchronous latch and enable controls: LE/DM1 updates latched data on high level (not edge-triggered), while OE/DM2 disables all outputs when high. Output rise/fall times are 21–68 ns (VDD = 3.3–5 V), and current setup time is 40 ns (typ.), supporting high-refresh-rate LED driving without ghosting.

Key Specifications

Pinout & Package

TSSOP-24 exposed pad package (JEDEC MO-153AC variant) with 0.65 mm pitch; exposed thermal pad must be soldered to PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC59283RTJR and IS31FL3731-QFLS4, STP16CP05XTTR uniquely balances 3.3 V logic compatibility, 30 MHz SPI speed, and 20 V output compliance - making it optimal for cost-sensitive, high-refresh-rate LED signage where external PWM generation is preferred and thermal management is handled via PCB design.

Availability

STP16CP05XTTR is available at Aetrix Electronics and suitable for LED video signage, industrial HMI panels, automotive interior lighting, and test equipment status displays requiring stable component supply and long-term production continuity.

Supply support for STP16CP05XTTR 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, microcontrollers, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STP16CP05 product line targets cost-effective, high-reliability LED driving in space-constrained applications - emphasizing thermal robustness, wide supply voltage range, and seamless integration with mainstream microcontrollers.

FAQ

What is the minimum recommended R_EXT value for 100 mA output current?

Per Table 9 in DS4850 Rev 14, a 200 Ω resistor sets nominal 100 mA output current. Using a lower value risks exceeding absolute maximum ratings: R_EXT < 200 Ω may cause output current >100 mA, violating IO = 100 mA limit and increasing thermal stress. Always verify actual current with oscilloscope and sense resistor under operating conditions.

Can STP16CP05XTTR drive LEDs with forward voltage above 5 V?

Yes - its 20 V output compliance voltage allows driving LED strings totaling up to 20 V (e.g., six 3.3 V white LEDs). The device regulates current regardless of VF, provided VDD ≥ (VF_string + V_drop). At 100 mA, typical dropout is 870 mV (Table 10), so VDD must exceed VF_string + 0.87 V.

Is the exposed thermal pad electrically connected internally?

No - the exposed pad is not internally connected to any die node. Per Figure 23 and Note in Section 8.4, it must be soldered to a PCB metal land that is either electrically isolated or connected to GND for thermal conduction. Connecting to VDD or signal nets violates thermal design and may cause malfunction.

How does propagation delay vary between 3.3 V and 5 V supply?

Propagation delays improve significantly at 5 V: tPLH1 (CLK→OUTn) drops from 45 ns (typ.) at 3.3 V to 24 ns (typ.) at 5 V; tPHL1 falls from 15 ns to 10 ns. This enables tighter timing margins in high-speed cascaded systems. All timing parameters in Table 7 are specified separately for both supply voltages.