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Allegro MicroSystems A6276EA-T
- Part No.:
- A6276EA-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
A6276EA-T.pdf
- Description:
- IC LED DRVR LINEAR 75.5MA 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,888
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Product details
Overview
A6276EA-T from Allegro MicroSystems is a 16-bit serial-input, constant-current latched LED driver in 24-pin DIP package, featuring BiCMOS architecture with integrated 16-bit shift register, data latches, and NPN sink drivers. It delivers up to 90 mA per output (VCE = 0.7 V), supports 20 MHz serial data input at 5 V logic supply, and enables inter-digit blanking via active-high ENABLE input. Designed for multiplexed LED displays including signage, instrumentation panels, and industrial HMIs.
For engineers reviewing the A6276EA-T datasheet, A6276EA-T pinout, A6276EA-T application, or A6276EA-T equivalent, key selection criteria include constant-current sink capability, serial-to-parallel latch control timing (tsu(L) = 100 ns), thermal performance (RθJA = 50 °C/W), undervoltage lockout (VDD(UV) = 3.4–4.0 V), and compatibility with microprocessor interfaces requiring CMOS-level serial data chaining.
Technical Context
The A6276EA-T integrates a 16-bit CMOS shift register cascaded with parallel-output latches and 16 matched NPN current-sink drivers. Serial data enters on rising clock edges and propagates through the shift register to SERIAL DATA OUT for daisy-chaining; latching occurs on high-level LATCH ENABLE, enabling synchronous update of all 16 outputs.
Output current is set externally via REXT (e.g., 250 Ω yields 75.5 mA typ. per channel at VCE = 0.7 V), with ±6.0% matching across outputs. Undervoltage lockout disables operation below ~3.7 V, and OUTPUT ENABLE (active-high) blanks all sinks without affecting latch state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 90 mA per channel (continuous, VCE = 0.7 V, TA ≤ 85°C) |
| Serial Data Rate | 20 MHz max (5 V logic supply, CMOS-compatible input) |
| Supply Voltage | 4.5–5.5 V (operating range); UVLO activates below 3.4–4.0 V |
| Output Matching | ±6.0% max current mismatch between any two outputs |
| Propagation Delay | 300–1000 ns (CLOCK/LATCH/ENABLE to OUTn) |
| Thermal Resistance | RθJA = 50 °C/W (24-pin DIP, 1-layer JEDEC PCB) |
| Operating Temp | –40°C to +85°C ambient (Range E specification) |
Pinout & Package
Package: 24-pin dual in-line package (DIP), lead-free with 100% matte tin plating, JEDEC MS-001 BE compliant. Copper leadframe enables full 90 mA continuous sink per output across temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Common reference for logic and power ground; shared terminal requires low-impedance layout to avoid switching noise coupling |
| 2 | SERIAL DATA IN | CMOS-level serial data input; sampled on rising edge of CLOCK |
| 3 | CLOCK | Asynchronous clock input controlling shift-register advancement; min. pulse width 50 ns |
| 4 | LATCH ENABLE | Active-high signal strobing shift-register contents into output latches; must be held high ≥100 ns before CLOCK edge |
| 5–20 | OUT0–OUT15 | 16 NPN open-collector current-sink outputs; each drives one LED segment/anode with user-set current via REXT |
| 21 | OUTPUT ENABLE | Active-high blanking control; disables all output drivers while preserving latch data |
| 22 | SERIAL DATA OUT | CMOS-level serial output for cascading multiple A6276 devices; compatible with next-stage SERIAL DATA IN |
| 23 | REXT | External resistor connection point setting all 16 output currents simultaneously (IO ∝ 1/REXT) |
| 24 | SUPPLY (VDD) | 5 V nominal logic supply; powers shift register, latches, and driver bias circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Constant-current sink outputs | Enables uniform LED brightness across segments without individual resistors; current set by single REXT (250–470 Ω typical) |
| CMOS serial interface | Direct microcontroller connection with 20 MHz data rate and 50 ns setup/hold timing, eliminating level-shifting needs |
| Daisy-chain capability | SERIAL DATA OUT allows unlimited expansion of display lines using identical A6276 devices without additional control signals |
| Inter-digit blanking | Hardware-blanking via OUTPUT ENABLE reduces ghosting in multiplexed displays and simplifies timing-critical microcontroller code |
| Undervoltage lockout | Prevents erratic behavior during power-up/down by disabling outputs until VDD stabilizes above 3.7 V threshold |
Applications
| LED Signage Displays | Industrial Panel Meters |
|---|---|
|
Use Scenario: Outdoor alphanumeric LED signs driven in multiplexed 1/8 or 1/16 scan mode with high ambient brightness requirements. IC Role / Device Role / Timing Role: Constant-current sink driver providing precise per-segment current control and synchronized blanking during digit transitions. Use Value: Eliminates brightness variation across characters by maintaining ±6.0% current matching and enabling clean inter-digit blanking via OUTPUT ENABLE. |
Use Scenario: Factory-floor panel meters displaying real-time process variables using 7-segment or dot-matrix LED arrays. IC Role / Device Role / Timing Role: Serial-input latched driver interfacing directly with microcontroller SPI peripherals to update display content without CPU overhead. Use Value: Reduces firmware complexity by offloading shift-and-latch timing (tsu(L) = 100 ns) and supporting daisy-chained expansion for multi-digit displays. |
| Automotive Instrument Clusters | Medical Device Status Indicators |
|
Use Scenario: Dashboard clusters requiring EMI-robust LED drive with wide temperature operation (–40°C to +85°C). IC Role / Device Role / Timing Role: High-reliability current sink driver with undervoltage lockout preventing display glitches during cold cranking (VDD dip). Use Value: Ensures consistent segment illumination under automotive voltage transients and meets AEC-Q100 stress requirements via robust BiCMOS process. |
Use Scenario: Patient monitor status indicators where LED reliability and predictable current drive are critical for regulatory compliance. IC Role / Device Role / Timing Role: Precision current source delivering stable 75.5 mA (typ.) per segment independent of VLED forward voltage variation. Use Value: Guarantees luminance consistency across red/green/blue LEDs (VF = 1.6–4.0 V) without recalibration, supporting IEC 60601-1 safety margins. |
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 undervoltage lockout and has lower max current (60 mA vs. 90 mA) | Legacy designs with existing PCB layouts; not suitable for new designs requiring >60 mA or UVLO protection | Select A6276EA-T when higher current headroom or robust power sequencing is required. |
| A6275ELWTR-T | 8-bit version in SOICW package; identical architecture but half the channel count and different pinout | Space-constrained applications needing fewer outputs; requires PCB redesign due to 20-pin SOICW vs. 24-pin DIP | Choose A6276EA-T for 16-channel density in through-hole assembly or legacy DIP-based systems. |
Compared with TB62706BN, A6276EA-T provides 50% higher sink current and built-in UVLO; compared with A6275ELWTR-T, it doubles channel count and retains through-hole manufacturability-making it optimal for high-density, thermally demanding LED signage and industrial HMI designs.
Availability
A6276EA-T is available at Aetrix Electronics and suitable for LED signage, industrial panel meters, and automotive instrument clusters requiring stable component supply, long-term lifecycle support, and through-hole assembly compatibility.
Supply support for A6276EA-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 precision power ICs, headquartered in Worcester, Massachusetts.
The A6276 product line delivers high-current, latch-based LED drivers optimized for multiplexed display systems requiring precise current regulation, serial expandability, and industrial-grade thermal performance.
FAQ
What is the maximum continuous output current per channel for the A6276EA-T?
The A6276EA-T supports up to 90 mA per output channel continuously across its full operating temperature range (–40°C to +85°C) when used in the 24-pin DIP package with proper PCB thermal design (RθJA = 50 °C/W). This rating assumes VCE = 0.7 V and is validated per Allegro's Absolute Maximum Ratings table. Actual current is set by the external REXT resistor and must be derated at higher duty cycles or ambient temperatures.
Does the A6276EA-T support daisy-chaining with other LED drivers?
Yes, the A6276EA-T supports daisy-chaining via its CMOS SERIAL DATA OUT pin (Pin 22), which connects directly to the SERIAL DATA IN of the next A6276EA-T or compatible device. This enables scalable display systems with arbitrary numbers of 16-bit segments without additional microcontroller I/O lines or timing overhead, maintaining full 20 MHz data throughput across the chain.
How does the undervoltage lockout (UVLO) function in the A6276EA-T?
The A6276EA-T incorporates an internal undervoltage lockout circuit that disables all output drivers when VDD falls below 3.4–4.0 V (typ. 3.7 V). This prevents erratic display behavior during power-up, brownouts, or cold-cranking events in automotive applications. The UVLO threshold is fixed and non-adjustable; operation resumes only after VDD exceeds the release threshold with sufficient hysteresis.
Can the A6276EA-T drive both red and blue LEDs with consistent brightness?
Yes, the A6276EA-T maintains consistent brightness across LED types by regulating sink current independently of forward voltage (VF). With VF ranging from 1.6 V (red) to 4.0 V (white/blue), the driver adjusts VCE to sustain the user-set current (e.g., 75.5 mA at REXT = 250 Ω). Current matching tolerance of ±6.0% ensures uniform luminance across mixed-color segments in the same display.
What is the purpose of the REXT pin (Pin 23) on the A6276EA-T?
Pin 23 (REXT) connects to an external resistor that sets the reference current for all 16 output drivers. The relationship is IO ≈ 15.5 V / REXT, yielding 75.5 mA (typ.) at 250 Ω and 40.0 mA (typ.) at 470 Ω. This single-resistor configuration eliminates per-channel calibration, reduces BOM count, and ensures matched current across outputs-critical for uniform LED display performance.
A6276EA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 24-DIP
A6276EA-T FAQ
1.How can I place an order for A6276EA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6276EA-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 A6276EA-T reliable?
The price and inventory of A6276EA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6276EA-T is usually 5 days.
3.What payment methods are accepted for A6276EA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6276EA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6276EA-T?
A6276EA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6276EA-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 A6276EA-T?
For technical support, including A6276EA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6276EA-T requirements.
6.How does Aetrix verify that A6276EA-T is sourced from the original manufacturer or authorized distributors?
All A6276EA-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 A6276EA-T meets industry standards.
7.What is the process for return or replacement of A6276EA-T?
All A6276EA-T units undergo pre-shipment inspection (PSI). If there is an issue with A6276EA-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 A6276EA-T part is unused and in its original packaging.
Return procedure for A6276EA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6276EA-T Tags
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