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STMicroelectronics ALED1642GWXTTR
- Part No.:
- ALED1642GWXTTR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ALED1642GWXTTR.pdf
- Description:
- IC LED DRVR LIN PWM 40MA 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,502
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Product details
Overview
ALED1642GWXTTR from STMicroelectronics is a 16-channel automotive-grade LED driver IC with integrated error detection, 7-bit programmable current gain (two ranges), and 12/16-bit PWM grayscale control. It delivers regulated constant current (3–40 mA per channel) with 20 V output capability, supports daisy-chained operation via 4-wire serial interface (up to 30 MHz), and features auto power-saving/wakeup-designed for dashboard backlighting and interior lighting systems requiring AEC-Q100 compliance.
For engineers reviewing the ALED1642GWXTTR datasheet, ALED1642GWXTTR pinout, ALED1642GWXTTR application, or ALED1642GWXTTR equivalent, key selection considerations include its 16-channel current sink architecture, TSSOP24EP package with exposed pad for thermal management, open/short LED diagnostic thresholds, gradual output delay for inrush control, and configurable turn-on/off timing across four settings.
Technical Context
The ALED1642GWXTTR integrates a 16-bit shift register, 16 independent current-sink channels with external resistor (R-EXT) programming, and a dedicated PWCLK-driven PWM counter supporting 12- or 16-bit brightness resolution. Its digital control logic uses LE-gated command keys (1–15 CLK pulses) to access configuration, brightness, and diagnostic registers.
Thermal protection includes overtemperature flag at 150 °C and automatic shutdown at 170 °C with 15–20 °C hysteresis; error detection operates in open-circuit, short-circuit, or combined modes with programmable thresholds, while SDO synchronization on CLK falling edge enables reliable daisy-chain data forwarding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sinks, each independently controllable for monochrome or RGB LED strings |
| Output current range | 3 mA to 40 mA per channel, set by R-EXT and adjusted via 7-bit gain register in two subranges |
| PWM resolution | Configurable 12-bit (4096 steps) or 16-bit (65536 steps) grayscale control per channel for precise dimming |
| Supply voltage | 3.0 V to 5.5 V - compatible with automotive 3.3 V and 5 V rail systems without level-shifting |
| Max clock frequency | 30 MHz serial interface - enables fast frame updates for dynamic displays (e.g., >1 kHz refresh with 16 channels) |
| Error detection | Dual-mode diagnostics: open-LED and shorted-LED detection with user-programmable thresholds and status reporting |
| Thermal protection | Overtemperature alert at 150 °C and automatic shutdown at 170 °C with hysteresis prevents thermal runaway |
| Package | TSSOP24EP (exposed pad) - provides low thermal resistance (37.5 °C/W) when soldered to PCB copper pour |
Pinout & Package
TSSOP24EP package with thermally enhanced exposed pad (soldered to PCB ground or isolated metal land); 0.65 mm pitch, 7.8 mm × 4.4 mm body size, compliant with JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all currents; must be low-impedance connection to minimize noise and thermal rise |
| SDI (Pin 2) | Serial data input | Accepts 16-bit command/data words on CLK rising edge; requires ≥5 ns setup/hold time |
| CLK (Pin 3) | Clock input | Drives internal shift register and command decoding; supports up to 30 MHz with ≤5 µs edge times |
| LE (Pin 4) | Latch enable | Edge-triggered control signal that selects register function (brightness, config, diagnostics) via pulse count |
| OUT0–OUT15 (Pins 5–20) | Constant-current outputs | 16 independent current sinks rated to 20 V; each drives LED anodes connected to common high-voltage rail |
| PWCLK (Pin 21) | PWM clock input | External clock source for PWM counter; internal 500 kΩ pull-up allows free-running mode if left floating |
| SDO (Pin 22) | Serial data output | Forwarded shifted-out data for daisy-chaining; configurable sync on CLK falling edge reduces inter-device skew |
| R-EXT (Pin 23) | Current setting reference | Connects external resistor (e.g., 11 kΩ) to set base current; gain register fine-tunes final output |
| VDD (Pin 24) | Power supply | 3–5.5 V input; internal UVLO (2.7 V rising / 2.2 V falling) prevents erratic operation during brownout |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (−40 °C to +125 °C junction), qualified for under-hood and cabin applications |
| Programmable output timing | Four selectable turn-on/turn-off times (30–180 ns rise, 20–150 ns fall) to suppress EMI and reduce inrush stress |
| Gradual output delay | Channel-to-channel staggered enable (10 ns step) minimizes simultaneous switching current spikes |
| Auto power management | Hardware-controlled auto-shutdown (<100 ns response) and wake-up (≤3 µs) eliminate need for MCU polling |
| Diagnostics integration | On-chip open/short detection with configurable thresholds and dedicated error-reporting register |
| High-speed daisy-chain | SDO synchronization on CLK falling edge ensures deterministic timing across multi-device cascades |
Applications
| Dashboard Backlighting | Instrument Cluster Indicators |
|---|---|
|
Use Scenario: Driving segmented LED arrays behind analog gauges and digital TFT overlays in vehicle instrument panels. IC Role / Device Role / Timing Role: Constant-current sink managing 16 independent backlight zones with synchronized PWM dimming and fault reporting. Use Value: Enables uniform luminance across temperature (±3% current matching at 125 °C) and eliminates manual calibration via open/short diagnostics. |
Use Scenario: Controlling discrete status LEDs (e.g., seatbelt, door-open, ABS warnings) with individual brightness scaling. IC Role / Device Role / Timing Role: Low-noise current driver with programmable rise/fall times to meet automotive EMC Class 3 limits. Use Value: Reduces conducted emissions by staggering output transitions (gradual delay) and suppressing current overshoot (<10%). |
| Interior Ambient Lighting | Center Console UI Lighting |
|
Use Scenario: Powering multi-zone RGB LED strips for mood lighting with smooth color transitions. IC Role / Device Role / Timing Role: 16-channel grayscale controller using 16-bit PWM for >65k-step intensity resolution per color channel. Use Value: Achieves flicker-free dimming down to 0.01% brightness without visible stepping due to high PWM resolution. |
Use Scenario: Illuminating capacitive touch buttons and icons on center stack with localized feedback lighting. IC Role / Device Role / Timing Role: Fault-aware driver providing real-time open-circuit detection to prevent single-LED failure from disabling full zone. Use Value: Maintains system integrity by isolating failed channels and reporting faults via SDO without interrupting active outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5940QPWPRQ1 | 16-channel, 12-bit PWM, no open/short detection; requires external current-setting resistors per channel | Lacks integrated diagnostics and auto power management; suited for cost-sensitive non-safety lighting | Select when diagnostic coverage is not required and board space permits discrete current-setting components |
| ASL2316SHN | 16-channel, AEC-Q100, integrated diagnostics, but only 8-bit PWM resolution and no gradual delay feature | Lower grayscale fidelity limits smooth dimming below 0.4% brightness; no channel-staggering for EMI reduction | Prefer for basic indicator lighting where 256-step dimming suffices and thermal margin is less constrained |
Compared with TLC5940QPWPRQ1 and ASL2316SHN, the ALED1642GWXTTR uniquely combines AEC-Q100 compliance, 16-bit PWM, per-channel diagnostics, and hardware auto-power control in a single TSSOP24EP package-making it optimal for safety-critical, high-fidelity automotive lighting where reliability and electromagnetic compatibility are co-prioritized.
Availability
ALED1642GWXTTR is available at Aetrix Electronics and suitable for automotive dashboard backlighting, instrument cluster indicators, and interior ambient lighting requiring stable component supply, long-term lifecycle support, and AEC-Q100 traceability.
Supply support for ALED1642GWXTTR 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 solutions with broad IP and manufacturing scale.
The ALED1642GWXTTR belongs to ST's automotive LED driver product line, engineered specifically for high-reliability interior lighting systems demanding diagnostic coverage, thermal resilience, and seamless integration into CAN/LIN-based vehicle networks.
FAQ
What is the maximum number of ALED1642GWXTTR devices that can be daisy-chained?
Up to 16 devices can be cascaded using the SDO-to-SDI connection, limited by total propagation delay and clock timing margins. At 30 MHz, the cumulative SDO-to-SDI delay across 16 units remains within specification when using CLK falling-edge synchronization, enabling large-area display control with single MCU interface.
How does the ALED1642GWXTTR handle LED open-circuit faults during operation?
When open-LED detection is enabled, the device monitors each OUTx node during active drive periods. If voltage exceeds the programmed threshold (configurable via CFG-7 and diagnostic registers), it flags the fault in the error register and maintains other channels' operation-no automatic channel disable occurs unless configured externally via host MCU.
Can the ALED1642GWXTTR operate with a 3.3 V supply while driving 20 V LED strings?
Yes-the 3.3 V VDD powers internal logic and bias circuits only; the 20 V output rating refers to the maximum voltage the current-sink outputs can withstand across their terminals (VOUT = VLED string − VOUTx). As long as the LED string cathode is tied to OUTx and anode to a 20 V rail, the device regulates current correctly at 3.3 V supply.
Is the R-EXT resistor value fixed or adjustable per design?
R-EXT is selected per application to set the base current range (e.g., 11 kΩ yields ~20 mA nominal). The 7-bit gain register then scales this base current in two subranges (coarse/fine), allowing fine-grained adjustment without changing the physical resistor-enabling one BOM item to cover multiple current requirements across variants.
ALED1642GWXTTR 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:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 19V
- Current - Output / Channel:
- 40mA
- Frequency:
- 30MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP-EP
ALED1642GWXTTR FAQ
1.How can I place an order for ALED1642GWXTTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ALED1642GWXTTR 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 ALED1642GWXTTR reliable?
The price and inventory of ALED1642GWXTTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALED1642GWXTTR is usually 5 days.
3.What payment methods are accepted for ALED1642GWXTTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALED1642GWXTTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALED1642GWXTTR?
ALED1642GWXTTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALED1642GWXTTR 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 ALED1642GWXTTR?
For technical support, including ALED1642GWXTTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALED1642GWXTTR requirements.
6.How does Aetrix verify that ALED1642GWXTTR is sourced from the original manufacturer or authorized distributors?
All ALED1642GWXTTR 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 ALED1642GWXTTR meets industry standards.
7.What is the process for return or replacement of ALED1642GWXTTR?
All ALED1642GWXTTR units undergo pre-shipment inspection (PSI). If there is an issue with ALED1642GWXTTR, 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 ALED1642GWXTTR part is unused and in its original packaging.
Return procedure for ALED1642GWXTTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ALED1642GWXTTR Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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