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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

STMicroelectronics ALED1262ZTTR

Name: ALED1262ZTTR
Brand: STMicroelectronics
SKU: ALED1262ZTTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ALED1262ZTTR

Manufacturer:: STMicroelectronics

Category:: LED Drivers

Package:: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: ALED1262ZTTR.pdf

Description:: IC LED DRV LIN PWM 60MA 24HTSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ALED1262ZTTR from STMicroelectronics is an automotive-grade 12-channel constant-current LED driver in HTSSOP24 exposed pad package, featuring 19 V output voltage capability, 6–60 mA per channel programmable current via single R_EXT, 7-bit local PWM dimming, open-LED detection, and dual-mode operation (I²C bus-driven or standalone OTP-configured). It targets rear and interior automotive lighting where robust fault reporting, EMI-reduced slow turn-on/off, and thermal shutdown at 170 °C are critical.

For engineers reviewing the ALED1262ZTTR datasheet, ALED1262ZTTR pinout, ALED1262ZTTR application, or ALED1262ZTTR equivalent, key selection considerations include its 5.5–38 V wide input range eliminating external pre-regulation, wired-OR FLG fault flag architecture, 400 kHz I²C interface with Hamming encoding, and thermal flag alert at 140 °C - all validated for AEC-Q100 Grade 1 compliance.

Technical Context

The ALED1262ZTTR integrates twelve low-side current sinks with matched regulation across channels, driven by a precision bandgap reference (1.233 V) and mirrored current architecture. Its internal LDO3 (3.3 V ±3%) powers digital blocks and serves as external reference, while UVLO (1.7–1.85 V falling) and PG threshold (1.9–2.0 V) enable reliable power sequencing in automotive battery environments.

It supports two independent operational modes: Bus-Driven Mode (BDM) using 400 kHz I²C with extended Hamming encoding for error resilience, and Standalone Mode (SAM) using OTP-programmed configurations selected via OTP1/2 pins. Fault handling includes open-LED detection per channel, thermal flag (140 °C), and full thermal shutdown (170 °C) with 15 °C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Output channels	12 independent low-side constant-current sinks, each capable of driving series-connected LEDs up to 19 V total forward drop
Output current range	6 mA to 60 mA per channel, set precisely by one external resistor (REXT = 4.99 kΩ to 49.9 kΩ)
Supply voltage range	5.5 V to 38 V on VDDA - accommodates automotive load dump without external protection circuitry
I²C interface	400 kHz fast-mode with selectable extended Hamming encoding - ensures data integrity in noisy vehicle environments
Thermal protection	Overtemperature alert at 140 °C (Tflg) and automatic shutdown at 170 °C (Tsd), both with defined hysteresis
Dimming control	7-bit local PWM (200–240 Hz) per channel + global PWM (500 Hz) on GPWM pin - enables fine-grained brightness tuning and synchronized flicker-free dimming
Fault reporting	Open-LED detection per channel; FLG pin supports wired-OR fault aggregation across multiple drivers on shared bus

Pinout & Package

Package: HTSSOP24 with exposed thermal pad (must be soldered to PCB ground plane for thermal performance; R_thj-b = 22.8 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
VDDD	Digital supply input	Supplies MCU-side logic (4.5–5.5 V); device enters SAM if <2.9 V; must slew ≤0.17 V/µs to avoid internal overvoltage
SDA / SCL	I²C bidirectional data / clock	400 kHz interface with pull-up required externally; supports Hamming-encoded communication for noise immunity
VDDA	Analog main supply	5.5–38 V input powering LED current sinks; supports pulsed dimming (100/200 Hz) without regulation loss
REXT	Current programming node	Connects external resistor to GND; sets all 12 channels' current via I_OUT = 1.233 V / R_EXT × 240
FLG	Open-drain fault flag	Wired-OR compatible; asserts low on open-LED, thermal alert, or shutdown; level-shifts automatically between VDDD and LDO3
GPWM	Global PWM dimming input	Accepts 500 Hz square wave ≥20 µs high pulse; synchronizes all channels; connect to LDO3 if unused
OUT0–OUT11	Low-side current outputs	12 independent sink terminals; each rated for 19 V max dropout; turn-on/off slowed to reduce EMI
Exposed pad	Thermal & electrical ground	Must be connected to PCB ground plane; primary thermal path - improves R_thj-b by >40% vs. non-soldered pad

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 (−40 °C to +125 °C ambient), qualified for exterior lighting systems
EMI reduction architecture	Gradual output turn-on/off timing + internal dithered clock - lowers peak spectral energy for CISPR 25 Class 5 compliance
Redundant configuration	OTP-based dual configuration storage (SAM_conf_1 / SAM_conf_2) with ECC and redundancy - enables fail-safe recovery after bus disconnect
Power supply flexibility	VDDA-only operation supported; VDDD optional - simplifies system partitioning in mixed-domain architectures
Error detection coverage	Per-channel open-LED detection + thermal flag + PG monitoring - provides layered fault visibility for ASIL-B relevant subsystems

Applications

Rear Combination Lamp

Interior Ambient Lighting

Use Scenario: Tail lamp assembly integrating brake, turn, and position functions with dynamic signature lighting.

IC Role / Device Role / Timing Role: 12-channel current sink driving red/amber LED strings; local 7-bit PWM enables sequential turn indicators and adaptive intensity modulation.

Use Value: Eliminates discrete current-setting resistors per channel; 19 V headroom supports 5–6 red LEDs in series; open-LED detection meets UNECE R128 functional safety requirements.

Use Scenario: Dashboard and footwell lighting with smooth dimming transitions and color-mixing backlighting.

IC Role / Device Role / Timing Role: Constant-current driver for RGBW LED zones; GPWM synchronizes global dimming while local PWM adjusts hue balance per zone.

Use Value: Slow turn-on/off prevents audible coil whine; LDO3 output powers microcontroller peripherals; thermal flag alerts before cabin temperature limits are exceeded.

Center High-Mount Stop Lamp (CHMSL)

License Plate Illumination

Use Scenario: High-brightness stop lamp mounted on rear window requiring high reliability and thermal resilience.

IC Role / Device Role / Timing Role: Drives parallel LED strings with redundant open-circuit detection; standalone mode (SAM) ensures operation during CAN bus faults.

Use Value: 38 V max VDDA withstands 24 V truck load dump transients; thermal shutdown at 170 °C prevents LED degradation under sealed enclosure conditions.

Use Scenario: Compact, cost-sensitive license plate module requiring minimal BOM count and board space.

IC Role / Device Role / Timing Role: Single-chip solution replacing discrete FETs + current sources; REXT programming eliminates calibration steps.

Use Value: HTSSOP24 exposed pad enables direct thermal coupling to metal housing; 6 mA minimum current supports ultra-low-power standby illumination.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-channel automotive LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLC59284RTJR	16-channel, 3.3 V only VDD; no open-LED detection; no thermal flag; no automotive qualification	Limited to 12 V systems; unsuitable for exterior lighting due to lack of AEC-Q100 rating and fault reporting	Select only for non-automotive interior modules with fixed 3.3 V rail and no safety-critical fault handling
ASL2415SHN	12-channel, 40 V max VDD; integrated diagnostics; SPI interface; higher quiescent current (3.5 mA vs. 0.7 mA)	Requires SPI host; lacks local 7-bit PWM (only global dimming); no LDO3 output for peripheral supply	Prefer when SPI infrastructure exists and diagnostic depth exceeds ALED1262ZTTR's capabilities - e.g., predictive maintenance logging

Compared with TLC59284RTJR and ASL2415SHN, the ALED1262ZTTR uniquely combines AEC-Q100 Grade 1 qualification, 7-bit per-channel PWM, integrated LDO3, and wired-OR FLG - making it the only option qualified for safety-critical rear lighting with full fault visibility and thermal margin.

Availability

ALED1262ZTTR is available at Aetrix Electronics and suitable for automotive rear lights, interior ambient lighting, CHMSL modules, and license plate illumination requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ALED1262ZTTR 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 automotive, industrial, and power management ICs with broad AEC-Q100-qualified portfolio coverage.

The ALED1262ZTTR belongs to ST's Automotive LED Driver product line, engineered specifically for exterior and interior lighting systems demanding high reliability, integrated diagnostics, and seamless integration into vehicle domain controllers.

FAQ

What is the maximum number of LEDs that can be driven in series per channel?

Each channel supports up to 19 V of LED forward voltage drop. For standard red LEDs (~2.1 V VF), this allows up to nine in series; for white LEDs (~3.2 V VF), up to five. The actual count depends on VF tolerance, temperature drift, and minimum dropout voltage (510 mV at 60 mA, 25 °C), which must be maintained across the current sink.

How does the wired-OR FLG connection work with multiple ALED1262ZTTR devices?

All FLG pins are connected to a single external pull-down resistor (e.g., 2.2 kΩ to GND). Any device detecting open-LED, thermal alert, or shutdown pulls FLG low. The internal high-side driver auto-selects between VDDD (if present) or LDO3 (if VDDD absent) to ensure logic-level compatibility across shared domains without external level shifters.

Can the ALED1262ZTTR operate without an I²C controller?

Yes - in Standalone Mode (SAM), it uses OTP-programmed configurations selected by OTP1/2 pin states. No external MCU is needed for basic operation; current is set by REXT, global dimming by GPWM, and fault reporting via FLG. I²C is optional for dynamic reconfiguration or diagnostics.

What is the role of the LDO3 pin beyond powering internal circuits?

LDO3 delivers a regulated 3.3 V ±3% output capable of sourcing up to 200 µA. It serves as external reference for ADCs or comparators, powers small peripherals (e.g., sensor bias), and acts as "tank capacitor" hold-up during VDDA pulsed dimming - preserving register state when main supply is modulated at 100/200 Hz.

ALED1262ZTTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Linear

Topology:: Buck

Internal Switch(s):: Yes

Number of Outputs:: 12

Voltage - Supply (Min):: 4.5V

Voltage - Supply (Max):: 38V

Voltage - Output:: 19V

Current - Output / Channel:: 60mA

Frequency:: 100kHz ~ 400kHz

Dimming:: PWM

Applications:: -

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 24-HTSSOP

ALED1262ZTTR FAQ

1.How can I place an order for ALED1262ZTTR through Aetrix?

Please submit a Request for Quotation (RFQ) for ALED1262ZTTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ALED1262ZTTR reliable?

The price and inventory of ALED1262ZTTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALED1262ZTTR is usually 5 days.

3.What payment methods are accepted for ALED1262ZTTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALED1262ZTTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ALED1262ZTTR?

ALED1262ZTTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ALED1262ZTTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ALED1262ZTTR?

For technical support, including ALED1262ZTTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALED1262ZTTR requirements.

6.How does Aetrix verify that ALED1262ZTTR is sourced from the original manufacturer or authorized distributors?

All ALED1262ZTTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ALED1262ZTTR meets industry standards.

7.What is the process for return or replacement of ALED1262ZTTR?

All ALED1262ZTTR units undergo pre-shipment inspection (PSI). If there is an issue with ALED1262ZTTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ALED1262ZTTR part is unused and in its original packaging.

Return procedure for ALED1262ZTTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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