STMicroelectronics STP08CDC596TTR

Overview

STP08CDC596TTR from STMicroelectronics is an 8-bit constant-current LED sink driver with integrated open/short-to-GND/short-to-V_LED fault detection, serial-in/parallel-out shift register architecture, 20–120 mA per channel output current adjustable via R_EXT, 25 MHz clock support, and 16 V output voltage capability - designed for high-reliability LED panel displays including traffic signage.

For engineers reviewing the STP08CDC596TTR datasheet, STP08CDC596TTR pinout, STP08CDC596TTR application, or STP08CDC596TTR equivalent, key selection criteria include its error-detection protocol timing sequence, R_EXT-based current calibration, TSSOP-16 exposed-pad thermal performance, and compatibility with 3.3 V microcontrollers in cascaded LED driver configurations.

Technical Context

The device integrates an 8-bit shift register feeding an 8-bit D-type storage register, enabling synchronous serial data loading and parallel output latching. Its output stage uses eight matched regulated current sinks, each programmable from 20 to 120 mA via a single external resistor (R_EXT), with ±3% channel-to-channel current matching at typical conditions.

Fault detection operates in a dedicated three-phase mode (entry → detection → resume) triggered by specific OE/DM2 and LE/DM1 logic sequences over five clock cycles. Detection results - indicating open, short-to-GND, or short-to-V_LED on each of the eight outputs - are serialized back via SDO within ≤2 µs per channel, without altering the pinout or PCB footprint versus non-detection variants.

Key Specifications

Pinout & Package

TSSOP-16 package with exposed thermal pad (JEDEC MO-153AC), 5.0 mm × 4.4 mm footprint, 0.65 mm pitch, lead-free ECOPACK® compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC59283RTJR and MAX7219CWG+, the STP08CDC596TTR uniquely delivers per-channel hardware-level fault detection within the same 16-pin TSSOP footprint, eliminating software overhead and external components while maintaining 16 V output headroom and 25 MHz update speed - critical for mission-critical outdoor signage.

Availability

STP08CDC596TTR is available at Aetrix Electronics and suitable for traffic signage, industrial HMI panels, and transit information systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for STP08CDC596TTR 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, delivering automotive, industrial, power, and analog/mixed-signal solutions with emphasis on reliability and energy efficiency.

The STP08CDC596 belongs to ST's LED driver product line, engineered specifically for high-density, fault-aware LED panel applications where visual integrity and predictive maintenance are mandatory - not general-purpose logic or power switching.

FAQ

What is the minimum R_EXT value supported, and how does it affect thermal dissipation?

The STP08CDC596TTR supports R_EXT down to 360 Ω, enabling up to 120 mA per channel. At this setting, total supply current reaches ~12.8 mA (ON state) plus output current sum. With all 8 channels sourcing 120 mA into 16 V loads, power dissipation exceeds 1.5 W - requiring the TSSOP-16 exposed pad to be soldered to a ≥2 cm² copper pour to maintain T_J < 125°C at 25°C ambient.

How does the detection mode interact with normal operation in a cascaded chain?

In cascaded configurations, detection mode must be entered and exited synchronously across all devices using shared CLK, OE/DM2, and LE/DM1 signals. The SDO of the last device feeds back to the MCU; intermediate devices pass detection bits through their SDO without latching. All devices execute detection simultaneously, ensuring consistent timing and avoiding inter-device skew in fault reporting.

Can the STP08CDC596TTR drive LEDs directly from a 24 V supply?

No - the STP08CDC596TTR's VDD pin accepts only 3.3 V to 5.5 V for logic operation. However, its output stage is rated for 16 V maximum voltage drop (V_LED – V_OUT). To use with 24 V LED strings, an external 16 V rail (e.g., DC-DC buck converter) must supply V_LED, while VDD remains at 3.3 V or 5 V. Exceeding 16 V across any OUTx–V_LED violates absolute maximum ratings.

Is the R_EXT resistor value affected by temperature drift, and how is current accuracy maintained?

R_EXT drift directly impacts output current (I_OUT ∝ 1/R_EXT). ST specifies ±3% current matching between channels and ±10% variation across units at 25°C. For stable operation over –40°C to +125°C, a 1% tolerance, 50 ppm/°C metal-film resistor is recommended. The internal current reference has ±1.5% tempco, so total worst-case current error remains within ±15% over full temperature range when using precision R_EXT.