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Allegro MicroSystems A6282ELW-T
- Part No.:
- A6282ELW-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
A6282ELW-T.pdf
- Description:
- IC LED DRIVER LINEAR 50MA 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,305
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Product details
Overview
A6282ELW-T from Allegro MicroSystems is a 16-channel constant-current LED sink driver IC designed for serially controlled LED display systems. It integrates a CMOS shift register, data latches, and 16 MOS output drivers with ±3% channel-to-channel current matching, 30 MHz max data rate, and external resistor–set current up to 50 mA per channel-used in full-color LED signage and display backlighting.
For engineers reviewing the A6282ELW-T datasheet, A6282ELW-T pinout, A6282ELW-T application, or A6282ELW-T equivalent, key selection criteria include output current accuracy across temperature, thermal shutdown behavior at 165°C, Schmitt-trigger noise immunity on digital inputs, and compatibility with 3.3 V/5 V microcontroller interfaces in cascaded LED driver configurations.
Technical Context
The A6282ELW-T implements a serial-to-parallel shift register architecture with level-sensitive latch enable (LE) and active-low output enable (OE), enabling precise timing control in high-refresh-rate LED displays. Its internal bandgap reference sets VEXT = 1.21 V (typ), allowing single-resistor programming of output current across all 16 channels.
It features integrated undervoltage lockout (UVLO) with 2.5–2.9 V turn-on threshold and thermal shutdown (TSD) at 165°C (typ) with 15°C hysteresis-both preserving latch state during fault recovery. The device supports cascading via SDO/SDI and operates with logic supply from 3.0 to 5.5 V and LED load voltage up to 12 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 16 constant-current sink outputs, each programmable up to 50 mA via REXT |
| Logic Supply Range | 3.0–5.5 V-supports direct interface with 3.3 V or 5 V microcontrollers |
| Max Data Rate | 30 MHz-enables fast refresh in high-resolution LED panels |
| Current Matching | ±3% between channels, ±7% between ICs-ensures uniform LED brightness |
| LED Voltage Support | Up to 12 V VLED-compatible with multi-LED strings and common-anode architectures |
| Thermal Protection | Internal TSD at 165°C (typ) with 15°C hysteresis-prevents damage without latch reset |
| Input Hysteresis | 250–900 mV Schmitt trigger-rejects noise on CLK, LE, OE, SDI in noisy display environments |
Pinout & Package
Package: 24-pin TSSOP with exposed thermal pad (LP package), lead-free with 100% matte tin plating. Thermal resistance RθJA = 28 °C/W on 4-layer JEDEC PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK (Pin 3) | Clock input | Drives shift register on rising edge; supports up to 30 MHz operation |
| LE (Pin 4) | Latch Enable | Level-triggered; transfers shift register contents to output latches when high |
| OE (Pin 21) | Output Enable | Active-low; disables all outputs when high, independent of latch state |
| SDI (Pin 2) | Serial Data In | Accepts 16-bit serial data stream synchronized to CLK |
| SDO (Pin 22) | Serial Data Out | Enables daisy-chaining of multiple A6282ELW-T devices |
| REXT (Pin 23) | Reference Current | Connects external resistor to GND to set all 16 output currents simultaneously |
| OUT0–OUT15 (Pins 5–20) | Constant-current sinks | Each delivers programmed current to cathode of LED string; VDS up to 12 V |
| VDD (Pin 24) | Logic supply | Powers internal CMOS logic, shift register, and latches (3.0–5.5 V) |
| GND (Pin 1) | Ground | Common reference for logic, load, and REXT-requires star grounding per layout guidelines |
| PAD | Exposed thermal pad | Must be connected to GND plane via thermal vias for thermal management (RθJA = 28 °C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor current setting | One external REXT sets identical current for all 16 channels-reduces BOM count and calibration complexity |
| Integrated UVLO and TSD | Prevents erratic display behavior during brownout and protects against thermal runaway without latch corruption |
| 30 MHz serial interface | Supports >1 kHz frame rates in 16×16 LED matrices-critical for flicker-free video signage |
| Schmitt-trigger inputs | Ensures clean clock and control edges in electrically noisy display cabinets with long cable runs |
| Cascadable SDO/SDI | Enables expansion to 32+, 48+, or N×16 outputs using identical timing and control signals |
Applications
| Monocolor LED Signboard | Full-Color LED Display |
|---|---|
Use Scenario: Outdoor alphanumeric signboards using red/green/yellow LED modules driven by microcontroller-based controllers. IC Role / Device Role / Timing Role: A6282ELW-T acts as constant-current column driver, receiving serialized pixel data and latching it per row scan cycle. Use Value: ±3% current matching ensures uniform brightness across 16-column segments; thermal shutdown prevents failure during solar-heated enclosure operation. | Use Scenario: Indoor video wall with RGB LED clusters requiring precise color balance and high refresh rates. IC Role / Device Role / Timing Role: A6282ELW-T serves as per-color-channel sink driver (e.g., one IC per R/G/B subpixel column), synchronized via shared CLK/LE. Use Value: 30 MHz data rate enables >3,000 Hz subframe updates; single REXT per IC simplifies factory calibration of color channel gain. |
| Display Backlighting | Multicolor LED Lighting |
Use Scenario: Edge-lit LCD backlight using white LED strings with local dimming zones. IC Role / Device Role / Timing Role: A6282ELW-T drives 16-zone LED strings, modulated via PWM on OE pin for dynamic contrast control. Use Value: 12 V VLED support allows series-connected LEDs per zone; ±7% inter-IC matching maintains consistent zone luminance across panel. | Use Scenario: Architectural lighting fixtures with programmable multicolor LED arrays (e.g., tunable white + accent colors). IC Role / Device Role / Timing Role: A6282ELW-T controls individual color groups (e.g., warm white, cool white, amber) in parallel-cascaded configuration. Use Value: Cascaded SDO/SDI reduces MCU GPIO usage; thermal pad connection ensures stable current under continuous 24/7 operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59283DBQR | 16-channel sink driver, but only 15 mA max per channel; no thermal shutdown; 25 MHz max data rate | Lower drive capability limits use to low-brightness indicators-not suitable for outdoor signage or backlighting | Select A6282ELW-T when >30 mA/channel, thermal protection, or >25 MHz speed is required |
| STP16DP05PTR | 16-channel sink driver with 100 mA max per channel; built-in error detection; 30 MHz data rate; no UVLO | Higher current supports longer LED strings but lacks undervoltage lockout-risk of display glitch during power ramp-up | Choose A6282ELW-T where robust power sequencing and guaranteed latch reset on brownout are critical |
Compared with TLC59283DBQR and STP16DP05PTR, the A6282ELW-T uniquely combines 50 mA/channel drive, ±3% matching, integrated UVLO+TSD, and Schmitt-trigger inputs-making it optimal for mission-critical LED signage where reliability, brightness uniformity, and noise immunity are non-negotiable.
Availability
A6282ELW-T is available at Aetrix Electronics and suitable for LED signage, display backlighting, and architectural lighting applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for A6282ELW-T 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
Allegro MicroSystems is a U.S.-based designer and manufacturer of high-performance magnetic sensing and power IC solutions, headquartered in Worcester, Massachusetts.
The A6282ELW-T belongs to Allegro's constant-current LED driver product line, engineered specifically for high-reliability, high-brightness LED display systems demanding precision current regulation, thermal resilience, and noise-immune serial control.
FAQ
What is the maximum output current per channel for the A6282ELW-T?
The A6282ELW-T delivers up to 50 mA per channel when configured with REXT = 374 Ω and VDD = 4.5–5.5 V. Output current is programmable via a single external resistor and remains stable across –40°C to +85°C ambient, with ±3% matching between channels and ±7% matching between ICs.
Does the A6282ELW-T support cascading with other A6282ELW-T devices?
Yes, the A6282ELW-T supports daisy-chain configuration via its SDO (Serial Data Out) and SDI (Serial Data In) pins. This enables expansion beyond 16 outputs-e.g., two A6282ELW-T devices provide 32 constant-current channels using shared CLK, LE, and OE signals without additional control logic.
What thermal protection features does the A6282ELW-T include?
The A6282ELW-T incorporates internal thermal shutdown (TSD) that disables outputs when junction temperature exceeds 165°C (typ), with 15°C hysteresis. Crucially, shift register and latch states remain intact during TSD events-no reinitialization or data reload is needed after cooling, ensuring uninterrupted display operation.
How does the A6282ELW-T handle power supply brownouts?
The A6282ELW-T includes an undervoltage lockout (UVLO) circuit that disables outputs when VDD drops below ~2.5 V (rising) or ~2.3 V (falling). Upon recovery, all registers and latches reset to zero-guaranteeing a known, safe startup state and preventing corrupted or partial LED patterns during power ramp-up.
What is the recommended PCB layout practice for the REXT pin on the A6282ELW-T?
Per Allegro's layout guidance, the REXT resistor must be placed adjacent to the REXT pin and its dedicated GND connection-separate from decoupling capacitor ground paths. This star-ground topology prevents ground bounce from coupling into the 1.21 V reference, ensuring stable, low-noise current regulation across all 16 A6282ELW-T outputs.
A6282ELW-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 12V
- Current - Output / Channel:
- 50mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
A6282ELW-T FAQ
1.How can I place an order for A6282ELW-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6282ELW-T 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 A6282ELW-T reliable?
The price and inventory of A6282ELW-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6282ELW-T is usually 5 days.
3.What payment methods are accepted for A6282ELW-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6282ELW-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6282ELW-T?
A6282ELW-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6282ELW-T 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 A6282ELW-T?
For technical support, including A6282ELW-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6282ELW-T requirements.
6.How does Aetrix verify that A6282ELW-T is sourced from the original manufacturer or authorized distributors?
All A6282ELW-T 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 A6282ELW-T meets industry standards.
7.What is the process for return or replacement of A6282ELW-T?
All A6282ELW-T units undergo pre-shipment inspection (PSI). If there is an issue with A6282ELW-T, 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 A6282ELW-T part is unused and in its original packaging.
Return procedure for A6282ELW-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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