STMicroelectronics ALED8102SXTTR

Overview

ALED8102SXTTR from STMicroelectronics is an AEC-Q100 Grade 1 qualified 8-channel low-side LED driver IC for automotive lighting, delivering 5–100 mA per channel via external resistor programming, supporting up to 19 V output voltage headroom, and operating from 3 V to 5.5 V supply across −40 °C to +150 °C junction temperature.

For engineers reviewing the ALED8102SXTTR datasheet, ALED8102SXTTR pinout, ALED8102SXTTR application, or ALED8102SXTTR equivalent, this page provides verified pin functions, thermal shutdown behavior (170 °C trip with 15 °C hysteresis), switch-controlled local dimming logic, global PWM brightness control via OE, and HTSSOP16 package layout guidance for automotive-grade thermal reliability.

Technical Context

The ALED8102SXTTR integrates eight independent low-side current sinks with matched regulation-channel-to-channel current mismatch ≤ ±3.5%-and supports local dimming via four dedicated SWx inputs that each toggle two outputs simultaneously (e.g., SW1 controls OUT0/OUT1). Its internal architecture uses MOSFET-based current generators requiring ≥0.85 V headroom at 50 mA and tolerating up to 19 V output voltage swing.

Global brightness control is implemented through the OE pin, which accepts PWM signals for synchronized dimming across all active channels; OE must be tied to GND if unused. Input pins feature integrated 300 kΩ pull-downs (SWx) and 300 kΩ pull-ups (OE), eliminating external biasing components in most configurations.

Key Specifications

Pinout & Package

Supplied in HTSSOP16 exposed pad package (5.0 mm × 6.4 mm × 1.05 mm), optimized for automotive thermal management: exposed pad must be soldered to PCB ground plane with ≥9 vias (e.g., 3×3 array) connecting to inner-layer copper pours to achieve 37.5 °C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC59284PWR and ASL2216SHN, the ALED8102SXTTR offers optimal balance of AEC-Q100 compliance, thermal robustness, and minimal external component count for cost-sensitive interior lighting-without sacrificing channel count or output voltage headroom.

Availability

ALED8102SXTTR is available at Aetrix Electronics and suitable for automotive instrument clusters, LCD backlights, ambient interior lighting, and rear combination lamps requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ALED8102SXTTR 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 microcontrollers, power management ICs, sensors, and automotive-grade analog products.

The ALED8102SXTTR belongs to ST's automotive LED driver product line, engineered specifically for interior and exterior lighting systems demanding AEC-Q100 qualification, high-voltage tolerance, and thermal resilience in space-constrained modules.

FAQ

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

The ALED8102SXTTR requires ≥0.85 V headroom across each current generator at 50 mA output (per DS12430 Rev 2, Table 4). Below this, regulation degrades linearly: at 1 V output voltage, current error is ≤0.04 %/V; at 3 V, it rises to ≤0.1 %/V. This headroom must be maintained between OUTn and GND regardless of LED forward voltage stack.

Can unused output channels be left floating?

Yes - unused OUT0–OUT7 pins may be left unconnected without risk of latch-up or leakage issues. The datasheet explicitly states outputs "can be connected in parallel, or left unconnected if not used." No pull-up/down is required, as each channel is independently disabled by its associated SWx input or global OE signal.

How does the thermal shutdown behave during operation?

Thermal shutdown activates at TJ ≈ 170 °C (typical), disabling only the eight output current sinks while leaving SWx and OE logic functional. Recovery occurs after junction temperature falls by ≥15 °C hysteresis. This selective shutdown preserves system visibility (e.g., cluster remains lit at reduced brightness) and avoids full MCU reinitialization.

What is the recommended power-up sequence?

VDD must be applied before or simultaneously with the LED supply rail (V_LED). If V_LED rises before VDD, the output stage may briefly activate due to undefined internal logic states, causing visible LED flash. The datasheet mandates this sequencing to ensure reliable startup in automotive battery environments where rail ramp rates vary.