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Allegro MicroSystems A6276ELWTR-T
- Part No.:
- A6276ELWTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
A6276ELWTR-T.pdf
- Description:
- IC LED DRVR LINEAR 75.5MA 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,161
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Product details
Overview
A6276ELWTR-T from Allegro MicroSystems is a 16-bit serial-input, constant-current latched LED driver in 24-pin SOICW package. It integrates a BiCMOS shift register, data latches, and 16 NPN sink drivers with user-adjustable current via REXT, supporting up to 90 mA per output at VCE = 0.7 V, 5 V logic supply, and 20 MHz serial data input rate. It is used in multiplexed LED displays requiring precise current control and inter-digit blanking.
For engineers reviewing the A6276ELWTR-T datasheet, A6276ELWTR-T pinout, A6276ELWTR-T application, or A6276ELWTR-T equivalent, key selection criteria include its 16-channel constant-current sink architecture, active-low OUTPUT ENABLE for global blanking, CMOS serial data output for cascading, and thermal performance (RθJA = 85 °C/W on 1-layer JEDEC PCB).
Technical Context
The A6276ELWTR-T implements a two-stage serial-to-parallel architecture: a 16-bit CMOS shift register accepts high-speed serial data (up to 20 MHz), followed by edge-triggered latches controlled by LATCH ENABLE. Output drivers are NPN transistors configured as constant-current sinks, with current set externally via REXT and regulated independently of VCE across 0.4–0.7 V.
It features undervoltage lockout (VDD(UV) = 3.4–4.0 V), active-low OUTPUT ENABLE for simultaneous channel disable (blanking), and CMOS-compatible inputs/outputs including SERIAL DATA OUT for daisy-chaining. All 16 outputs share identical current matching (±1.5% typical) and exhibit propagation delays ≤1000 ns for CLOCK/LATCH/ENABLE-to-OUT transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 independent constant-current sink drivers |
| Max output current | 90 mA per channel, continuous, at VCE = 0.7 V, TA = 85°C |
| Serial data rate | Up to 20 MHz at VDD = 5 V - enables fast display refresh in high-resolution LED matrices |
| Current setting | Externally programmable via single REXT resistor - supports 34–87 mA range (REXT = 470 Ω to 250 Ω) |
| Logic supply | 4.5–5.5 V - compatible with standard 5 V microcontroller I/O |
| UVLO threshold | 3.4–4.0 V - prevents erratic operation during power ramp-up or brownout |
| Propagation delay | ≤1000 ns (CLOCK/LATCH/ENABLE to OUT) - ensures tight timing control in synchronized displays |
Pinout & Package
Package: 24-pin SOICW (wide-body), RoHS-compliant, 100% matte tin leadframe plating, RθJA = 85 °C/W on 1-layer JEDEC PCB.
| 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 serial input to shift register - data sampled on rising clock edge |
| 3 | CLOCK | Rising-edge-triggered shift clock - minimum pulse width 50 ns, max frequency 10 MHz for guaranteed timing |
| 4 | LATCH ENABLE | High-level strobe - transfers shift register contents to output latches; held high to bypass latching |
| 5–20 | OUT0–OUT15 | 16 NPN constant-current sink outputs - each delivers user-set current when OUTPUT ENABLE is low |
| 21 | OUTPUT ENABLE | Active-low global blanking control - high disables all outputs simultaneously without affecting latch state |
| 22 | SERIAL DATA OUT | CMOS serial output - enables cascading multiple A6276 devices for >16-bit drive |
| 23 | REXT | External current-setting resistor connection - sets identical sink current for all 16 outputs |
| 24 | SUPPLY (VDD) | 5 V logic supply - powers internal CMOS circuitry and bias networks |
Key Features
| Feature | Design Value |
|---|---|
| 16-channel constant-current sink | Enables uniform LED brightness across multiplexed displays without per-channel resistors |
| Undervoltage lockout (UVLO) | Prevents partial initialization and output glitches during unstable power conditions |
| CMOS serial data output | Supports unlimited daisy-chaining for large LED arrays without external logic |
| Inter-digit blanking via OE | Allows precise timing control of digit-on/off periods in 7-segment or dot-matrix displays |
| Low-power CMOS logic core | Reduces total system power: IDD(OFF) = 0.8–1.4 mA when outputs disabled |
Applications
| LED Matrix Display Driver | 7-Segment Multiplexed Display |
|---|---|
Use Scenario: Driving 16×16 red-green-blue LED matrix panels in outdoor signage with 1/16 scan ratio. IC Role / Device Role / Timing Role: Constant-current sink driver providing synchronized column current control with inter-digit blanking for flicker-free scanning. Use Value: Delivers 75.5 mA typical per channel at REXT = 250 Ω, enabling full-brightness operation under 6.25% duty cycle while maintaining thermal safety (TJ < 150°C). | Use Scenario: Controlling 8-digit, 7-segment + decimal point displays in industrial panel meters. IC Role / Device Role / Timing Role: Serial-input latched driver managing segment current and digit blanking via OUTPUT ENABLE for rapid digit cycling. Use Value: Supports 20 MHz serial input rate and ≤1000 ns propagation delay, allowing sub-millisecond digit updates and eliminating ghosting. |
| Architectural LED Lighting | POS Terminal Display Module |
Use Scenario: Powering addressable LED strips in retail store accent lighting with uniform color fidelity. IC Role / Device Role / Timing Role: Current-regulated sink stage interfacing between microcontroller SPI bus and high-VF white LEDs (3.5–4.0 V). Use Value: Matches output current within ±1.5% typical between channels, minimizing visible brightness variation across 16 parallel LED strings. | Use Scenario: Driving alphanumeric vacuum fluorescent display (VFD) segments in point-of-sale terminals. IC Role / Device Role / Timing Role: High-voltage tolerant (VO = –0.5 to 17 V) sink driver handling VFD anode voltages up to 15 V with safe leakage (<5 μA). Use Value: Enables direct interface to 12–15 V VFD supplies without external level-shifting, reducing BOM count and layout complexity. |
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 |
|---|---|---|---|
| TB62706BN | Pin-compatible 16-bit sink driver; lacks UVLO and has higher RθJA (100 °C/W); no SERIAL DATA OUT | No built-in daisy-chain capability; requires external gating for blanking | Choose TB62706BN only if legacy footprint reuse is critical and cascading is unnecessary |
| A6275ELWTR-T | 8-bit version of same family; identical SOICW package, REXT interface, and UVLO; half the channel count | Requires two devices for 16-bit applications; increases board area and routing complexity | Select A6275ELWTR-T when driving smaller displays or where channel count flexibility justifies dual-device layout |
Compared with TB62706BN, A6276ELWTR-T adds UVLO protection and daisy-chain support; compared with A6275ELWTR-T, it halves component count and interconnect for 16-bit LED systems while maintaining identical thermal and current-setting behavior.
Availability
A6276ELWTR-T is available at Aetrix Electronics and suitable for LED matrix display driver, 7-segment multiplexed display, and architectural LED lighting applications requiring stable component supply and long-term production continuity.
Supply support for A6276ELWTR-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, power ICs, and precision analog semiconductors, headquartered in Worcester, Massachusetts.
The A6276 product line is engineered specifically for high-reliability LED display systems, emphasizing current accuracy, thermal robustness, and seamless microcontroller integration via serial interfaces.
FAQ
What is the maximum continuous output current per channel for A6276ELWTR-T?
The A6276ELWTR-T supports up to 90 mA per output channel continuously at VCE = 0.7 V and ambient temperature of 85°C. This rating assumes proper PCB thermal design (1-layer JEDEC board, RθJA = 85 °C/W). At lower ambient temperatures or with enhanced copper area, higher currents may be sustained, but must remain within the absolute maximum junction temperature limit of 150°C. The actual current is set by the external REXT resistor and verified in the Electrical Characteristics table of the A6276ELWTR-T datasheet.
How does the OUTPUT ENABLE pin function on A6276ELWTR-T?
The OUTPUT ENABLE pin (Pin 21) on A6276ELWTR-T is an active-low control that globally disables all 16 output drivers when driven high, placing them in high-impedance off-state - this is used for inter-digit blanking in multiplexed displays. Critically, the latch contents remain unchanged during blanking, so output states are preserved and immediately restored when OE returns low. This behavior allows precise timing control without retransmitting serial data, and is confirmed in the Truth Table and Functional Description sections of the A6276ELWTR-T datasheet.
Can A6276ELWTR-T be cascaded with other LED drivers?
Yes, A6276ELWTR-T supports cascading via its CMOS SERIAL DATA OUT pin (Pin 22), which outputs the shifted-out bit from the internal 16-bit register. This allows daisy-chaining multiple A6276ELWTR-T devices - for example, connecting Pin 22 of Device 1 to Pin 2 of Device 2 - to drive more than 16 outputs using a single serial data line and shared CLOCK/LATCH ENABLE signals. The A6276ELWTR-T datasheet confirms this capability in the Functional Block Diagram and Terminal Description, with timing specifications ensuring reliable propagation across chains.
What is the purpose of the REXT pin on A6276ELWTR-T?
The REXT pin (Pin 23) on A6276ELWTR-T connects to an external resistor that sets the constant-current value for all 16 output drivers simultaneously. The current per channel is inversely proportional to REXT: for example, 250 Ω yields ~75.5 mA typical, while 470 Ω yields ~40.0 mA typical (at VCE = 0.7 V). This single-resistor configuration ensures matched current across all outputs and eliminates per-channel calibration. The relationship is defined in the A6276ELWTR-T datasheet's Electrical Characteristics and Applications Information sections, including a graph of IO vs. REXT.
Does A6276ELWTR-T include undervoltage lockout protection?
Yes, A6276ELWTR-T incorporates undervoltage lockout (UVLO) circuitry that disables internal logic and outputs when VDD falls below 3.4–4.0 V (typical 3.7 V), preventing erratic behavior during power-up, brownout, or noisy supply conditions. This feature is explicitly listed in the Features and Benefits section and quantified in the Absolute Maximum Ratings and Electrical Characteristics tables of the A6276ELWTR-T datasheet. UVLO ensures the A6276ELWTR-T remains in a known safe state until stable 5 V operation is established.
A6276ELWTR-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):
- 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
A6276ELWTR-T FAQ
1.How can I place an order for A6276ELWTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6276ELWTR-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 A6276ELWTR-T reliable?
The price and inventory of A6276ELWTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6276ELWTR-T is usually 5 days.
3.What payment methods are accepted for A6276ELWTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6276ELWTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6276ELWTR-T?
A6276ELWTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6276ELWTR-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 A6276ELWTR-T?
For technical support, including A6276ELWTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6276ELWTR-T requirements.
6.How does Aetrix verify that A6276ELWTR-T is sourced from the original manufacturer or authorized distributors?
All A6276ELWTR-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 A6276ELWTR-T meets industry standards.
7.What is the process for return or replacement of A6276ELWTR-T?
All A6276ELWTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6276ELWTR-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 A6276ELWTR-T part is unused and in its original packaging.
Return procedure for A6276ELWTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6276ELWTR-T Tags
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