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Allegro MicroSystems A6276ELW
- Part No.:
- A6276ELW
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
A6276ELW.pdf
- Description:
- IC LED DRVR LINEAR 75.5MA 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,309
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Product details
Overview
A6276ELW from Allegro MicroSystems is a 16-bit serial-input, constant-current latched LED driver in 24-pin SOICW package, featuring 90 mA per-output sink capability, 20 MHz max serial data rate at 5 V logic supply, and user-adjustable output current via single external resistor (REXT). It serves as a direct functional replacement for TB62706BN/BF in multiplexed LED display systems requiring precise current control and inter-digit blanking.
For engineers reviewing the A6276ELW datasheet, A6276ELW pinout, A6276ELW application, or A6276ELW equivalent, this device supports high-density LED signage, industrial panel displays, and automotive instrument clusters where stable per-bit current matching (±1.5% typical), undervoltage lockout (3.4–4.0 V), and cascaded serial-data-out architecture are critical selection criteria.
Technical Context
The A6276ELW integrates a 16-bit CMOS shift register, parallel latches, and 16 NPN constant-current sink drivers on a single BiCMOS die. Its ENABLE input operates active-low to globally blank all outputs, while LATCH ENABLE enables serial-to-parallel data transfer on high-level assertion.
Output current is set by REXT (e.g., 250 Ω yields 75.5 mA typ at VCE = 0.7 V), with matching tolerance of ±1.5% between any two outputs. The device supports cascade operation via CMOS SERIAL DATA OUT and tolerates up to 10 MHz clock frequency under recommended operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 75.5 mA typical per channel at VCE = 0.7 V with REXT = 250 Ω - sets brightness consistency across 16 LEDs without per-channel resistors. |
| Serial Data Rate | 20 MHz max at 5 V logic supply - enables fast refresh of large LED matrices with minimal microcontroller overhead. |
| Undervoltage Lockout | 3.4–4.0 V threshold - prevents erratic output behavior during brownout or power-up sequencing. |
| Output Current Matching | ±1.5% typical between any two outputs - ensures uniform LED intensity across display segments. |
| Clock Frequency | 10 MHz max for reliable switching - defines maximum update rate when cascading multiple A6276ELW devices. |
| Logic Supply Voltage | 4.5–5.5 V - compatible with standard 5 V microcontroller I/O without level-shifting. |
| Thermal Resistance | RθJA = 85 °C/W (SOICW, 1-layer PCB) - requires thermal derating above 25°C ambient for full 90 mA continuous operation. |
Pinout & Package
Package: 24-pin SOICW (wide-body surface-mount), RoHS-compliant, 100% matte tin leadframe plating, JEDEC MS-013 AD compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Common reference for logic and power ground - must be low-impedance to avoid latch misoperation due to switching noise. |
| 2 | SERIAL DATA IN | CMOS input for serial bitstream - accepts 5 V logic levels; data shifted on rising clock edge. |
| 3 | CLOCK | CMOS clock input - rising edge triggers shift register advance; min pulse width 50 ns. |
| 4 | LATCH ENABLE | Active-high strobe - transfers shift register contents to output latches; held high for bypass mode. |
| 5–20 | OUT0–OUT15 | 16 NPN current-sink outputs - each delivers user-set constant current to LED cathodes; VCE drop ≤ 0.75 V at 90 mA. |
| 21 | OUTPUT ENABLE | Active-low global blank - disables all outputs simultaneously for inter-digit blanking; latch data preserved. |
| 22 | SERIAL DATA OUT | CMOS serial output - enables daisy-chaining to expand beyond 16 outputs without additional controller pins. |
| 23 | REXT | Current-setting node - connects external resistor to set identical sink current for all 16 outputs. |
| 24 | SUPPLY (VDD) | 5 V logic supply input - powers internal CMOS logic and bias circuits; decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-current sink outputs | Up to 90 mA per channel with ±1.5% matching - eliminates need for individual current-limiting resistors and ensures display uniformity. |
| Undervoltage lockout (UVLO) | 3.4–4.0 V activation range - guarantees clean startup and prevents partial output activation during unstable supply conditions. |
| Cascadable serial interface | CMOS SERIAL DATA OUT supports unlimited daisy-chain expansion - reduces microcontroller GPIO count for large LED arrays. |
| Inter-digit blanking | Active-low OUTPUT ENABLE pin - enables precise timing control for multiplexed displays to suppress ghosting and crosstalk. |
| BiCMOS process technology | Combines low-power CMOS logic with robust NPN output transistors - achieves 20 MHz data rate while sustaining 90 mA sink capability. |
Applications
| LED Signage Panels | Industrial HMI Displays |
|---|---|
|
Use Scenario: Outdoor alphanumeric LED signs with 8–16 digit modules driven in multiplexed configuration. IC Role / Device Role / Timing Role: Constant-current sink driver for segment/cathode control; handles serial data chaining across modules and synchronizes blanking via OUTPUT ENABLE. Use Value: Enables uniform brightness across 128+ LEDs using only 4 MCU pins (DATA, CLOCK, LATCH, OE), with no per-LED resistor network. |
Use Scenario: Factory-floor operator panels with 7-segment numeric readouts and status indicators. IC Role / Device Role / Timing Role: Serial-to-parallel LED driver with latch hold; provides stable current drive despite voltage fluctuations in industrial 24 V DC environments. Use Value: Delivers 75.5 mA per segment at 0.7 V CE drop, minimizing self-heating and ensuring >100,000-hour display reliability. |
| Automotive Instrument Clusters | Point-of-Sale Display Modules |
|
Use Scenario: Analog-style speedometer/odometer displays with segmented LED backlighting in automotive dashboards. IC Role / Device Role / Timing Role: High-immunity LED driver with UVLO and ground-noise tolerant layout - interfaces directly to CAN-connected microcontrollers. Use Value: Withstands –40 to +85°C ambient and rejects >2.5 V ground bounce, preventing false segment activation during engine cranking. |
Use Scenario: Retail checkout displays showing price, item count, and payment status using red/green/yellow LEDs. IC Role / Device Role / Timing Role: Low-cost, high-reliability LED driver supporting mixed-color LED strings (VF = 1.6–4.0 V) via adjustable REXT. Use Value: Single REXT resistor configures identical current for red (1.9 V), green (2.1 V), and yellow (2.05 V) LEDs - simplifies BOM and calibration. |
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 |
|---|---|---|---|
| TB62706BF | Same 16-bit serial architecture and pinout; lower max output current (60 mA) and no UVLO circuit. | Acceptable for low-brightness indoor displays but unsuitable for outdoor signage requiring 90 mA drive. | Select A6276ELW when full 90 mA per channel and undervoltage protection are mandatory. |
| A6275ELW | 8-bit version of same family; identical SOICW package, REXT interface, and UVLO, but half the channel count. | Used where fewer LED segments are needed - e.g., 4-digit displays instead of 8-digit or larger. | Choose A6276ELW over A6275ELW when 16 independent constant-current sinks are required per IC. |
Compared with TB62706BF, A6276ELW delivers 50% higher output current and adds undervoltage lockout for robustness; versus A6275ELW, it doubles channel density while maintaining identical footprint and thermal profile - enabling scalable display designs without board redesign.
Availability
A6276ELW is available at Aetrix Electronics and suitable for LED signage panels, industrial HMI displays, and automotive instrument clusters requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for A6276ELW 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, power ICs, and precision motion-control solutions since 1989.
The A6276ELW belongs to Allegro's LED driver product line, engineered specifically for high-reliability, constant-current segment driving in multiplexed alphanumeric and graphical LED displays.
FAQ
What is the maximum continuous output current per channel for A6276ELW?
The A6276ELW supports up to 90 mA continuous sink current per output (OUT0–OUT15) when operated within thermal limits. At 25°C ambient with REXT = 250 Ω, typical current is 75.5 mA at VCE = 0.7 V. Derating is required above 25°C based on RθJA = 85 °C/W for the SOICW package. The A6276ELW datasheet specifies absolute maximum IO = 90 mA, with safe continuous operation dependent on PCB copper area and airflow.
Does A6276ELW require external current-setting resistors per channel?
No, the A6276ELW uses a single external resistor (REXT) connected to pin 23 to set identical constant-current for all 16 outputs. This eliminates 16 discrete resistors and ensures matched brightness across LED segments. For example, REXT = 250 Ω yields ~75.5 mA per channel, while REXT = 470 Ω yields ~40.0 mA - both values confirmed in the A6276ELW electrical characteristics table.
Can A6276ELW be cascaded with other A6276ELW devices?
Yes, the A6276ELW supports seamless cascading via its CMOS SERIAL DATA OUT (pin 22), which feeds directly into the SERIAL DATA IN (pin 2) of the next device. This allows expansion to 32, 48, or more outputs using only one microcontroller data line. The A6276ELW truth table and timing diagrams confirm compatibility with multi-device chains operating up to 10 MHz clock frequency.
What is the function of the OUTPUT ENABLE pin on A6276ELW?
The OUTPUT ENABLE pin (pin 21) is an active-low control that globally disables all 16 output drivers while preserving latch data - enabling inter-digit blanking in multiplexed LED displays. When high, outputs are turned off (blanked); when low, outputs reflect their latched states. This feature is essential for eliminating crosstalk and ghosting in high-density LED arrays driven by the A6276ELW.
Is A6276ELW compatible with 3.3 V microcontrollers?
The A6276ELW logic inputs (SERIAL DATA IN, CLOCK, LATCH ENABLE, OUTPUT ENABLE) accept 3.3 V signals only if VDD = 5 V and VIH ≥ 0.7 × VDD = 3.5 V - thus 3.3 V may not reliably meet the high-level input threshold. A level shifter or pull-up to 5 V is recommended. The A6276ELW datasheet specifies VIH(min) = 3.5 V at VDD = 5 V, confirming that direct 3.3 V MCU interfacing risks marginal operation unless verified with actual waveform margins.
A6276ELW 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):
- 4.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4V
- Current - Output / Channel:
- 75.5mA
- Frequency:
- 20MHz
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
A6276ELW FAQ
1.How can I place an order for A6276ELW through Aetrix?
Please submit a Request for Quotation (RFQ) for A6276ELW 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 A6276ELW reliable?
The price and inventory of A6276ELW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6276ELW is usually 5 days.
3.What payment methods are accepted for A6276ELW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6276ELW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6276ELW?
A6276ELW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6276ELW 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 A6276ELW?
For technical support, including A6276ELW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6276ELW requirements.
6.How does Aetrix verify that A6276ELW is sourced from the original manufacturer or authorized distributors?
All A6276ELW 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 A6276ELW meets industry standards.
7.What is the process for return or replacement of A6276ELW?
All A6276ELW units undergo pre-shipment inspection (PSI). If there is an issue with A6276ELW, 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 A6276ELW part is unused and in its original packaging.
Return procedure for A6276ELW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6276ELW Tags
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