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Allegro MicroSystems A6276ELPTR
- Part No.:
- A6276ELPTR
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A6276ELPTR.pdf
- Description:
- IC LED DRVR LIN 75.5MA 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,778
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Product details
Overview
A6276ELPTR from Allegro MicroSystems is a 16-bit serial-input, constant-current latched LED driver with NPN sink outputs, 24-pin TSSOP package, 90 mA max per output, 5 V logic supply, and user-adjustable current via external REXT. It targets multiplexed LED displays requiring precise current control and microprocessor interface.
For engineers reviewing the A6276ELPTR datasheet, A6276ELPTR pinout, A6276ELPTR application, or A6276ELPTR equivalent, this device supports high-speed serial data rates up to 10 MHz, inter-digit blanking via active-low ENABLE, cascaded operation through CMOS serial data output, and thermal management via exposed thermal pad in its TSSOP-LP package.
Technical Context
The A6276ELPTR integrates a 16-bit CMOS shift register, parallel latches, and 16 matched NPN constant-current sink drivers - all operating from a single 5 V logic supply. Its undervoltage lockout activates below 3.4 V, and output current is set by one external resistor (REXT) across terminals 23 and GND.
It supports synchronous serial-to-parallel conversion using CLOCK (rising-edge triggered), LATCH ENABLE (high-active strobe), and OUTPUT ENABLE (low-active blanking). The CMOS SERIAL DATA OUT enables daisy-chaining for expanded channel count without additional controller I/O.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 90 mA per channel (continuous, at VCE = 0.7 V, TA = 85°C, REXT = 250 Ω) |
| Logic Supply Voltage | 4.5–5.5 V (supports standard 5 V microcontroller interfaces) |
| Max Clock Frequency | 10 MHz (enables fast display refresh in multiplexed LED systems) |
| Propagation Delay | 300–1000 ns (CLOCK/LATCH/ENABLE to output; ensures timing margin in real-time display control) |
| Thermal Resistance | RθJA = 32 °C/W (on 2-layer PCB with 3.8 in² copper; critical for sustained 16-channel drive) |
| Undervoltage Lockout | Triggers at VDD < 3.4 V (prevents erratic output behavior during power ramp-up/down) |
| Serial Data Rate | Up to 20 MHz typical (at 5 V supply; supports high-throughput pixel loading) |
Pinout & Package
Package: 24-pin TSSOP with exposed thermal pad (LP suffix); RoHS-compliant, 100% matte tin leadframe plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Common reference for logic and power ground; must be low-impedance to avoid latch misfires |
| 2 | SERIAL DATA IN | CMOS-level serial input feeding shift register on rising CLOCK edge |
| 3 | CLOCK | Rising-edge clock for serial data shifting; min pulse width 50 ns |
| 4 | LATCH ENABLE | High-active signal transferring shift register contents to output latches |
| 5–20 | OUT0–OUT15 | 16 NPN current-sinking outputs; each delivers user-set constant current to LED cathodes |
| 21 | OUTPUT ENABLE | Active-low global blanking control; disables all outputs without affecting latch state |
| 22 | SERIAL DATA OUT | CMOS-level serial output for cascading multiple A6276 devices |
| 23 | REXT | Connection point for external current-setting resistor (sets all 16 outputs identically) |
| 24 | SUPPLY (VDD) | 5 V logic supply input; powers internal CMOS logic and bias circuitry |
Key Features
| Feature | Design Value |
|---|---|
| 16-channel constant-current sink | Enables uniform LED brightness across 16 segments/digits without per-channel resistors |
| User-adjustable output current | Single REXT sets identical current for all 16 outputs (e.g., 40 mA at REXT = 470 Ω) |
| Inter-digit blanking | Active-low OUTPUT ENABLE allows synchronized digit blanking in multiplexed displays |
| Cascadable serial interface | SERIAL DATA OUT permits daisy-chaining for >16-bit LED arrays without extra MCU pins |
| Low-power CMOS logic core | Typical IDD(OFF) = 0.8 mA (VOE = 5 V); reduces idle power in battery-backed displays |
Applications
| LED Segment Displays | Dot-Matrix Panels |
|---|---|
|
Use Scenario: Driving 4–8 digit 7-segment LED displays in industrial HMIs and instrumentation panels. IC Role / Device Role / Timing Role: Constant-current sink driver providing stable segment current during dynamic multiplexing at 1–2 kHz. Use Value: Eliminates brightness variation between digits via matched output current (±1.5% typical matching) and supports blanking between digit scans. |
Use Scenario: Controlling monochrome 16×16 or 32×16 LED dot-matrix modules in signage and status indicators. IC Role / Device Role / Timing Role: Row/column driver in scan-line architecture, accepting serialized pixel data and latching full rows. Use Value: Enables high refresh rates (≥100 Hz) using 10 MHz clock support and low propagation delay (≤1 μs) for minimal ghosting. |
| LED Annunciator Boards | Automotive Dashboard Modules |
|
Use Scenario: Driving discrete red/green/yellow LED indicators in PLC I/O modules and safety panels. IC Role / Device Role / Timing Role: Direct replacement for discrete transistor/resistor networks; handles ON/OFF sequencing via serial command. Use Value: Reduces BOM count and PCB area vs. discrete solutions while supporting rapid indicator strobing via OUTPUT ENABLE. |
Use Scenario: Backlighting and symbol illumination in automotive instrument clusters operating from 12 V supply rails. IC Role / Device Role / Timing Role: Low-side current sink for LED strings, interfacing with CAN/FlexRay host controllers via SPI-compatible serial interface. Use Value: Withstands –40°C to +85°C ambient range and provides undervoltage lockout to prevent flicker during cold cranking (battery dip). |
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 constant-current sink driver; no undervoltage lockout; higher RθJA (60 °C/W in SOP24) | Lacks UVLO and thermal performance of A6276ELPTR; suitable only for stable 5 V supplies and lower ambient temps | Select TB62706BN only if legacy footprint reuse is mandatory and thermal derating is acceptable |
| A6275ELWTR-T | 8-bit version (half channel count); same LP/LW package options; identical REXT current-setting and ENABLE functionality | Requires two devices for 16-bit coverage; increases layout area and component count but simplifies thermal design | Choose A6275ELWTR-T when system requires modular scalability or lower per-device power dissipation |
Compared with TB62706BN, A6276ELPTR adds undervoltage lockout and superior thermal resistance (32 vs. 60 °C/W), enabling robust operation in wide-temperature industrial environments; versus A6275ELWTR-T, it halves board space and interconnect complexity for full 16-bit LED arrays.
Availability
A6276ELPTR is available at Aetrix Electronics and suitable for LED segment displays, dot-matrix signage, annunciator boards, automotive dashboard modules, and industrial HMI applications requiring stable component supply and long-term production continuity.
Supply support for A6276ELPTR 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 designs high-performance magnetic sensors and power ICs for motion control, energy-efficient systems, and precision analog applications.
The A6276 product line delivers integrated constant-current LED drivers optimized for reliability and thermal efficiency in demanding display applications across automotive, industrial, and consumer markets.
FAQ
What is the maximum continuous output current per channel for the A6276ELPTR?
The A6276ELPTR supports up to 90 mA per output channel continuously under specified conditions: VCE = 0.7 V, ambient temperature ≤85°C, and REXT = 250 Ω. This rating assumes proper PCB thermal design - specifically, a 2-layer board with 3.8 in² copper area per side - to maintain RθJA = 32 °C/W. Exceeding these conditions requires derating per the datasheet's duty-cycle curves.
How does the A6276ELPTR set its output current, and what resistor value yields ~40 mA per channel?
The A6276ELPTR uses a single external resistor (REXT) connected between pin 23 and GND to set all 16 output currents identically. At VCE = 0.7 V and TA = 25°C, a 470 Ω REXT yields a typical output current of 40.0 mA per channel. The relationship is inverse and nonlinear - halving REXT more than doubles current - so designers must consult the "Output Current vs. REXT" curve (Dwg. GP-061) for precise values.
Can the A6276ELPTR be used in cascaded configurations, and what is required for reliable daisy-chaining?
Yes, the A6276ELPTR supports cascading via its CMOS SERIAL DATA OUT (pin 22), which feeds the SERIAL DATA IN (pin 2) of the next device. For reliable operation, ensure signal integrity by minimizing trace length, using series termination (~33 Ω) near the driving output, and maintaining clean power/ground. The datasheet confirms compatibility up to 10 MHz clock frequency in cascade mode, with propagation delay ≤1000 ns between stages.
What is the function of the OUTPUT ENABLE pin on the A6276ELPTR, and how does it differ from LATCH ENABLE?
The OUTPUT ENABLE pin (pin 21) is an active-low global blanking control: when high, all 16 outputs are disabled (turned OFF), regardless of latch state; when low, outputs reflect their latched data. In contrast, LATCH ENABLE (pin 4) is active-high and controls data transfer from the shift register to the output latches - it does not affect output conduction directly. This separation allows independent control of data loading and display visibility.
Does the A6276ELPTR include protection features, and how does undervoltage lockout behave?
Yes, the A6276ELPTR includes undervoltage lockout (UVLO) that disables internal logic and outputs when VDD falls below approximately 3.4 V (typical). This prevents erratic behavior during power-up/down sequences. UVLO releases hysteresis-free - the device resumes normal operation immediately upon VDD exceeding 4.0 V. No external components are needed; UVLO is fully integrated and tested across temperature.
A6276ELPTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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-TSSOP-EP
A6276ELPTR FAQ
1.How can I place an order for A6276ELPTR through Aetrix?
Please submit a Request for Quotation (RFQ) for A6276ELPTR 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 A6276ELPTR reliable?
The price and inventory of A6276ELPTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6276ELPTR is usually 5 days.
3.What payment methods are accepted for A6276ELPTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6276ELPTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6276ELPTR?
A6276ELPTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6276ELPTR 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 A6276ELPTR?
For technical support, including A6276ELPTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6276ELPTR requirements.
6.How does Aetrix verify that A6276ELPTR is sourced from the original manufacturer or authorized distributors?
All A6276ELPTR 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 A6276ELPTR meets industry standards.
7.What is the process for return or replacement of A6276ELPTR?
All A6276ELPTR units undergo pre-shipment inspection (PSI). If there is an issue with A6276ELPTR, 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 A6276ELPTR part is unused and in its original packaging.
Return procedure for A6276ELPTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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