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Allegro MicroSystems A6282ELWTR-T
- Part No.:
- A6282ELWTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
A6282ELWTR-T.pdf
- Description:
- IC LED DRIVER LINEAR 50MA 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,534
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Product details
Overview
A6282ELWTR-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 A6282ELWTR-T datasheet, A6282ELWTR-T pinout, A6282ELWTR-T application, or A6282ELWTR-T equivalent, key selection criteria include output current accuracy across temperature, thermal shutdown behavior at 165°C, Schmitt-trigger noise immunity on all digital inputs, and compatibility with 3.3 V/5 V microcontroller interfaces in cascaded LED driver configurations.
Technical Context
The A6282ELWTR-T implements a serial-to-parallel architecture where SDI data is clocked into a 16-bit shift register on CLK rising edges, then latched to output drivers via LE. Its internal bandgap reference (1.21 V typical) sets output current via REXT, enabling precise per-channel regulation independent of VLED up to 12 V.
It features integrated protection including undervoltage lockout (UVLO) with 2.5–2.9 V activation thresholds and thermal shutdown (TSD) at 165°C with 15°C hysteresis. All outputs are actively disabled when OE is high, and Power-On Reset initializes registers to zero.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 16 constant-current sink outputs, each programmable up to 50 mA via external REXT resistor |
| Logic Supply Range | 3.0–5.5 V - supports direct interface with 3.3 V or 5 V microcontrollers without level shifting |
| Max Data Rate | 30 MHz - enables high-speed LED pattern updates in dynamic displays |
| Current Matching | ±3% between channels, ±7% between ICs - ensures uniform brightness across multi-device LED arrays |
| LED Voltage Support | Up to 12 V VLED - accommodates series-connected LEDs or high-VF white/blue LEDs |
| Protection Features | Integrated UVLO (2.5–2.9 V threshold) and thermal shutdown (165°C TJ, 15°C hysteresis) |
| Digital Input Hysteresis | 250–900 mV - improves noise immunity on CLK, LE, OE, and SDI lines in electrically noisy environments |
Pinout & Package
A6282ELWTR-T is packaged in a 24-pin TSSOP (LP) with exposed thermal pad, lead-free and 100% matte tin plating. The exposed pad must be connected to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK (Pin 3) | Clock input | Edge-triggered serial data shift clock; rising edge loads SDI data into shift register |
| LE (Pin 4) | Latch Enable | Level-sensitive control that transfers shift register contents to output latches when high |
| OE (Pin 21) | Output Enable | Active-low global enable; high state forces all 16 outputs off regardless of latch state |
| SDI (Pin 2) | Serial Data In | CMOS input accepting 3.0–5.5 V logic; feeds 16-bit shift register on CLK↑ |
| SDO (Pin 22) | Serial Data Out | Shift register MSB output; enables daisy-chaining of multiple A6282 devices |
| REXT (Pin 23) | Reference Current | Connects to external resistor to ground; sets all 16 output currents via internal 1.21 V bandgap reference |
| OUT0–OUT15 (Pins 5–20) | Constant-current sinks | 16 open-drain NMOS outputs; each delivers regulated current to LED cathodes |
| VDD (Pin 24) | Logic supply | 3.0–5.5 V power for internal logic, shift register, and latches |
| GND (Pin 1) | Ground | Common return for logic, load, and REXT; shared ground requires star layout to avoid noise coupling |
| PAD (exposed) | Thermal pad | Not electrically connected internally; must be soldered to GND plane with thermal vias for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor current programming | One external REXT sets identical 16-channel output current - simplifies BOM and eliminates per-channel trimming |
| Cascadable serial interface | SDO output allows unlimited expansion of LED drive lines using daisy-chained A6282 devices without additional MCU GPIOs |
| Schmitt-trigger digital inputs | 250–900 mV hysteresis on CLK, LE, OE, SDI - rejects EMI-induced glitches in industrial LED sign environments |
| Power-on reset (POR) | Guarantees all shift register and latch bits initialize to 0 at power-up - prevents random LED turn-on during boot |
| Thermal shutdown with latch retention | Outputs disable at 165°C junction temperature but retain latch data - display resumes immediately after cooling |
Applications
| Monocolor LED Signboard | Full-Color LED Display |
|---|---|
Use Scenario: Outdoor alphanumeric message boards using discrete red/green/yellow LEDs arranged in dot-matrix format. IC Role / Device Role / Timing Role: A6282ELWTR-T acts as column driver, sinking current from rows driven by external row controllers; serial data updates pixel states at up to 30 MHz. Use Value: ±3% channel matching ensures consistent brightness across all sign columns; thermal shutdown protects against ambient heat buildup in sealed enclosures. | Use Scenario: Indoor video wall composed of RGB LED modules, each requiring independent intensity control per color channel. IC Role / Device Role / Timing Role: A6282ELWTR-T drives one color (e.g., red) per module, with three A6282 devices per module (R/G/B); cascaded SDO/SDI links reduce controller pin count. Use Value: External REXT programming enables precise white-point tuning across modules; 12 V VLED support accommodates forward voltage stacks in high-brightness RGB LEDs. |
| Display Backlighting | Multicolor LED Lighting |
Use Scenario: Edge-lit LCD panel backlight using parallel strings of white LEDs powered from 12 V rail. IC Role / Device Role / Timing Role: A6282ELWTR-T serves as local current sink per LED string, receiving PWM-modulated serial data from backlight controller IC. Use Value: 30 MHz data rate supports high-frequency PWM dimming without visible flicker; low 1.21 V REXT reference minimizes power loss in current-setting network. | Use Scenario: Architectural accent lighting with programmable color zones using addressable multicolor LED strips. IC Role / Device Role / Timing Role: A6282ELWTR-T controls individual LED groups in fixed-color segments (e.g., amber + blue), synchronized via shared CLK/LE from lighting controller. Use Value: Schmitt-trigger inputs reject noise from nearby AC wiring; ±7% inter-device matching ensures consistent zone brightness across distributed installations. |
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 with 12-bit PWM dimming per channel; no thermal shutdown; 25 MHz max data rate | Requires external PWM generation or microcontroller timing; lacks TSD and UVLO protection | Choose when per-channel grayscale control is required over robustness; not drop-in due to different register map and missing safety features |
| STP16CP05MTR | 16-channel sink driver with 30 MHz data rate; ±6% channel matching; no internal UVLO or thermal shutdown | Relies on system-level protection; higher current mismatch affects color uniformity in displays | Consider for cost-sensitive lighting where thermal derating is managed externally; verify PCB layout meets stricter noise immunity requirements |
Compared with TLC59283DBQR and STP16CP05MTR, the A6282ELWTR-T provides superior reliability for outdoor signage through integrated UVLO and thermal shutdown, tighter ±3% channel matching for display uniformity, and Schmitt-trigger inputs for noise-prone environments-without requiring additional protection circuitry or layout overhead.
Availability
A6282ELWTR-T is available at Aetrix Electronics and suitable for LED signage, display backlighting, and multicolor architectural lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for A6282ELWTR-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 sensors, motor drivers, and power ICs, headquartered in Worcester, Massachusetts.
The A6282 product line delivers robust, thermally protected constant-current LED drivers optimized for outdoor signage, transportation displays, and industrial lighting where reliability under temperature stress and electrical noise is critical.
FAQ
What is the maximum LED supply voltage supported by the A6282ELWTR-T?
The A6282ELWTR-T supports a maximum LED load supply voltage (VLED) of 12.0 V, as specified in its absolute maximum ratings and confirmed in electrical characteristics tables. This allows driving series-connected LEDs or high-forward-voltage white/blue LEDs while maintaining safe operation within the device's 13.2 V absolute maximum limit. Operation above 12 V risks exceeding thermal limits or violating recommended operating conditions.
How does the REXT resistor set output current in the A6282ELWTR-T?
The A6282ELWTR-T uses an internal 1.21 V (typical) bandgap reference applied to the REXT pin. Output current per channel is calculated as IO(max) = (18841.2 / REXT) + 0.68 mA for VDD = 4.5–5.5 V. For example, a 374 Ω resistor yields ~51.1 mA typical output. REXT must be ≥374 Ω to ensure stability and stay within datasheet-specified current limits.
Does the A6282ELWTR-T support daisy-chaining with other A6282 devices?
Yes, the A6282ELWTR-T supports daisy-chaining via its SDO (Serial Data Out) pin, which outputs the MSB of the internal shift register. When cascading, SDO of one A6282ELWTR-T connects to SDI of the next, sharing common CLK and LE signals. The datasheet confirms this topology supports up to 25 MHz in cascaded mode and provides timing diagrams validating reliable multi-device operation.
What protection features are built into the A6282ELWTR-T?
The A6282ELWTR-T integrates undervoltage lockout (UVLO) that disables outputs when VDD drops below 2.3–2.9 V, and thermal shutdown (TSD) that turns off outputs at 165°C junction temperature with 15°C hysteresis. Both features are fully internal-no external components required-and preserve latch data during TSD events, enabling immediate recovery upon cooling.
Is the exposed thermal pad on the A6282ELWTR-T electrically connected internally?
No, the exposed thermal pad on the A6282ELWTR-T (TSSOP-LP package) is not connected internally to any die node. It must be externally soldered to the PCB's GND plane using thermal vias to dissipate heat effectively. The datasheet explicitly states "PAD - Exposed pad for enhanced thermal dissipation; not connected internally," and recommends connecting it to GND for both thermal performance and noise reduction in the REXT reference path.
A6282ELWTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
A6282ELWTR-T FAQ
1.How can I place an order for A6282ELWTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6282ELWTR-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 A6282ELWTR-T reliable?
The price and inventory of A6282ELWTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6282ELWTR-T is usually 5 days.
3.What payment methods are accepted for A6282ELWTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6282ELWTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6282ELWTR-T?
A6282ELWTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6282ELWTR-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 A6282ELWTR-T?
For technical support, including A6282ELWTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6282ELWTR-T requirements.
6.How does Aetrix verify that A6282ELWTR-T is sourced from the original manufacturer or authorized distributors?
All A6282ELWTR-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 A6282ELWTR-T meets industry standards.
7.What is the process for return or replacement of A6282ELWTR-T?
All A6282ELWTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6282ELWTR-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 A6282ELWTR-T part is unused and in its original packaging.
Return procedure for A6282ELWTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6282ELWTR-T Tags
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