STMicroelectronics LED8102SXTTR

Overview

LED8102SXTTR from STMicroelectronics is an 8-channel low-side constant-current LED driver IC in HTSSOP16 (exposed pad) package, delivering programmable 5–100 mA per channel via external resistor R_EXT, supporting up to 19 V output headroom and global PWM dimming via OE pin, used for appliance display backlighting and industrial function indicators.

For engineers reviewing the LED8102SXTTR datasheet, LED8102SXTTR pinout, LED8102SXTTR application, or LED8102SXTTR equivalent, key selection criteria include channel-to-channel current matching (±1.2% typ), thermal shutdown at 170 °C with 15 °C hysteresis, and switch-input control logic mapping SW1–SW4 to paired outputs (OUT0/OUT1 through OUT6/OUT7).

Technical Context

The LED8102SXTTR integrates eight independent low-side current sinks with MOSFET-based regulation, each requiring ≥0.85 V headroom for stable 5–100 mA operation and rated for up to 19 V output voltage swing. Its digital control layer uses four dedicated switch inputs (SW1–SW4), each internally pulled down by 300 kΩ, enabling direct TTL/CMOS-compatible ON/OFF control of two-output pairs without address decoding.

Global brightness adjustment is implemented via the OE pin, which accepts PWM signals up to 5.5 V and forces all active channels into synchronous dimming mode; when OE is high, all outputs disable regardless of SWx states. Internal thermal protection disables only output stages-not logic-upon junction temperature exceeding 170 °C, with automatic recovery after 15 °C cooldown.

Key Specifications

Pinout & Package

HTSSOP16 package with exposed thermal pad-requires soldering pad to PCB ground plane for effective heat dissipation (R_thj-amb = 37.5 °C/W on JEDEC 2S2P board). Pin 1 is GND; pins 5–12 are output terminals OUT0–OUT7; pin 15 is R-EXT connection point; pin 16 is V_DD.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-channel LED driver applications.

Compared with TLC59283RTJR and MAX7219CWG+, LED8102SXTTR offers simpler hardware integration for fixed-function local dimming, eliminates firmware dependency, and provides higher per-channel current precision (±1.2% vs. ±3% typical) without serial communication overhead.

Availability

LED8102SXTTR is available at Aetrix Electronics and suitable for appliance display backlighting, industrial function indicators, architectural lighting zone control, and RGB color mixing modules requiring stable component supply and long-lifecycle support.

Supply support for LED8102SXTTR 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The LED8102SXTTR belongs to ST's LED driver product line, engineered specifically for cost-sensitive, high-reliability lighting applications requiring direct hardware control, thermal resilience, and minimal external components.

FAQ

What is the minimum headroom voltage required for stable current regulation?

The LED8102SXTTR requires a minimum output headroom voltage of 0.85 V across each current generator to maintain regulation. At 50 mA output, typical headroom is ~1.4 V; lower headroom causes current droop, while excessive headroom increases power dissipation. The device guarantees regulation up to 19 V output voltage swing.

How does the OE pin interact with the SWx inputs during PWM dimming?

When OE is held low, outputs respond directly to SWx states-enabling local on/off control. When OE receives a PWM signal, all currently enabled outputs (per SWx) are synchronously modulated at the same duty cycle. If OE is high, all outputs force OFF regardless of SWx logic levels-a hardware emergency disable function.

Can unused output channels be left unconnected without affecting performance?

Yes-unused OUT0–OUT7 pins may be left unconnected or tied to GND without impacting regulation accuracy or thermal behavior. The device does not require termination resistors or dummy loads on inactive channels, simplifying layout for partial-channel implementations.

What PCB layout practices maximize thermal performance in HTSSOP16 package?

Solder the exposed thermal pad directly to a large copper pour connected to GND via ≥9 vias (e.g., 3×3 array); use ≥4-layer board with inner power/ground planes; extend copper beyond package footprint; avoid narrow traces on V_DD and GND paths. These practices reduce R_thj-amb toward the specified 37.5 °C/W.