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Allegro MicroSystems A6276ELP
- Part No.:
- A6276ELP
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A6276ELP.pdf
- Description:
- IC LED DRVR LIN 75.5MA 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,577
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Product details
Overview
A6276ELP from Allegro MicroSystems is a 16-bit serial-input constant-current latched LED driver in 24-pin TSSOP with exposed thermal pad, featuring 90 mA per output sink capability, 20 MHz serial data input rate at 5 V logic supply, and user-adjustable current via single external resistor (REXT). It serves as the core current-sinking interface between microcontrollers and multiplexed LED displays in industrial panel meters and signage systems.
For engineers reviewing the A6276ELP datasheet, A6276ELP pinout, A6276ELP application, or A6276ELP equivalent, key selection criteria include its 24-pin TSSOP-LP package thermal performance (RθJA = 32°C/W on 2-layer PCB), active-low OUTPUT ENABLE for inter-digit blanking, and CMOS serial data output enabling cascaded 32+ bit drive configurations without additional logic.
Technical Context
The A6276ELP integrates a 16-bit BiCMOS shift register with parallel latches and 16 NPN constant-current sink drivers. Its logic operates from a 4.5–5.5 V supply, while output voltage tolerance extends to 17 V, supporting LED strings with forward voltages up to 4.0 V and VCE drops as low as 0.4 V.
Undervoltage lockout activates below 3.4–4.0 V VDD, preventing erratic operation during power ramp-up. The device supports cascade topology via SERIAL DATA OUT, and all outputs disable synchronously when OUTPUT ENABLE is high-enabling precise time-multiplexed display control with ≤4.5 μs enable pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 90 mA per channel (continuous, single output, VCE = 0.7 V, REXT = 250 Ω) |
| Serial Data Rate | 20 MHz max at 5 V logic supply-supports fast LED refresh in high-resolution displays |
| Supply Voltage | 4.5–5.5 V operating range-compatible with standard 5 V microcontroller I/O |
| Thermal Resistance | RθJA = 32°C/W on 2-layer PCB with 3.8 in² copper-enables full 90 mA per output at 85°C ambient |
| Output Enable | Active-high blanking input with 4.5 μs minimum pulse width-synchronizes inter-digit off-time |
| Logic Inputs | VIH ≥ 0.7VDD, VIL ≤ 0.3VDD-ensures robust noise margin with 5 V CMOS systems |
| Propagation Delay | 300–1000 ns (CLOCK/LATCH/ENABLE to OUT)-predictable timing for tight multiplexing control |
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 misoperation |
| 2 | SERIAL DATA IN | CMOS serial input to shift register-data sampled on rising clock edge |
| 3 | CLOCK | Rising-edge-triggered shift clock-minimum 50 ns pulse width required |
| 4 | LATCH ENABLE | High-level strobe transfers shift register contents to output latches-bypassing disables latching |
| 5–20 | OUT0–OUT15 | 16 NPN constant-current sink outputs-each independently controlled by latch state |
| 21 | OUTPUT ENABLE | Active-high global blanking-disables all outputs without affecting latch contents |
| 22 | SERIAL DATA OUT | CMOS serial output for daisy-chaining multiple A6276 devices |
| 23 | REXT | External current-setting resistor connection-sets identical sink current for all 16 outputs |
| 24 | SUPPLY (VDD) | 5 V logic supply input-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 operation during brown-out conditions-ensures reliable startup at ≥3.4 V |
| Cascadable serial output | Permits expansion to 32+, 48+, or N×16-bit drive with single microcontroller SPI line |
| Inter-digit blanking control | Global OUTPUT ENABLE allows precise timing of digit-off periods in 7-segment or dot-matrix systems |
| User-adjustable current | Single REXT resistor sets identical current for all 16 outputs-simplifies BOM and calibration |
Applications
| Industrial Panel Meters | LED Signage Modules |
|---|---|
Use Scenario: Driving 4–8 digit 7-segment displays in programmable logic controller (PLC) HMI panels with 1–2 kHz multiplexing frequency. IC Role / Device Role / Timing Role: Constant-current sink driver providing synchronized digit blanking and serial data chaining across multiple display segments. Use Value: Eliminates need for discrete current-limiting resistors and enables uniform brightness across digits despite varying segment count per digit. | Use Scenario: Controlling red/green/blue LED pixels in outdoor variable-message signs requiring high ambient visibility and thermal resilience. IC Role / Device Role / Timing Role: High-current (up to 90 mA) sink driver managing LED strings with VF up to 4.0 V and duty-cycle-dependent current derating. Use Value: Supports 85°C continuous operation with RθJA = 32°C/W, reducing thermal management complexity in sealed enclosures. |
| Test Equipment Displays | Automotive Instrument Clusters |
Use Scenario: Driving alphanumeric vacuum fluorescent display (VFD) replacements in benchtop multimeters and oscilloscopes using multiplexed anode scanning. IC Role / Device Role / Timing Role: Serial-to-parallel latched driver delivering precise current control and fast 20 MHz data loading for rapid display updates. Use Value: Enables sub-millisecond digit updates and eliminates ghosting through accurate latch-enable timing and output matching ±1.5%. | Use Scenario: Powering segmented LED backlighting in analog/digital hybrid instrument clusters with ESD-sensitive environments. IC Role / Device Role / Timing Role: Automotive-grade (–40°C to +85°C) constant-current sink with Class 2 ESD protection and undervoltage lockout. Use Value: Ensures fail-safe behavior during cold-cranking (low-battery) events and meets ISO 10605 ESD immunity requirements. |
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 | 8-bit architecture, no UVLO, higher RθJA (65°C/W), DIP-only packaging | Limited to smaller displays; lacks thermal headroom for sustained 90 mA operation | Select only for legacy 8-bit designs where board space and thermal budget allow |
| A6275ELWTR-T | 8-bit version, same LP/LW package options, identical electrical specs per channel | Requires two devices for 16-bit coverage-increases layout area and BOM count | Choose when design flexibility demands modular 8-bit expansion or lower channel count |
Compared with TB62706BN and A6275ELWTR-T, the A6276ELP delivers full 16-bit integration in thermally optimized TSSOP-LP, eliminating cascading overhead and enabling single-chip solutions for medium-complexity LED displays with guaranteed 90 mA per output at 85°C.
Availability
A6276ELP is available at Aetrix Electronics and suitable for industrial HMI panels, LED signage modules, and test equipment displays requiring stable component supply and long-term lifecycle support.
Supply support for A6276ELP 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 sensing and power ICs, headquartered in Worcester, Massachusetts.
The A6276 product line delivers integrated constant-current LED drivers for industrial and commercial display systems, emphasizing thermal efficiency, current accuracy, and microcontroller interoperability.
FAQ
What is the maximum continuous output current per channel for the A6276ELP?
The A6276ELP supports up to 90 mA continuous sink current per output (OUT0–OUT15) when VCE = 0.7 V, REXT = 250 Ω, and ambient temperature is ≤85°C on a 2-layer PCB with 3.8 in² copper. Derating applies above 25°C ambient or with higher VCE-see Figure GP-062-9 in the A6276ELP datasheet for duty-cycle and temperature curves.
Does the A6276ELP support daisy-chaining with other LED drivers?
Yes, the A6276ELP includes a CMOS SERIAL DATA OUT (pin 22) that enables direct daisy-chaining of multiple A6276 devices. Serial data shifted out from one A6276ELP feeds into the SERIAL DATA IN of the next, allowing expansion beyond 16 bits without external logic-ideal for large LED matrices or multi-digit displays.
How does the OUTPUT ENABLE pin function on the A6276ELP?
The OUTPUT ENABLE pin (pin 21) is active-high and globally disables all 16 output drivers when driven high, blanking the connected LEDs without altering latch contents. A minimum pulse width of 4.5 μs is required for reliable blanking-this feature enables precise inter-digit or inter-segment timing control in multiplexed LED applications using the A6276ELP.
What external component sets the output current for the A6276ELP?
A single external resistor (REXT) connected between pin 23 (REXT) and ground determines the output current for all 16 channels of the A6276ELP. For example, a 250 Ω resistor yields ~75.5 mA typical per output at VCE = 0.7 V. The relationship is inverse and linear-lower resistance increases current, higher resistance decreases it-per the A6276ELP's internal current mirror architecture.
Is the A6276ELP compatible with 3.3 V microcontrollers?
No-the A6276ELP requires a 4.5–5.5 V logic supply (VDD on pin 24) and specifies VIH ≥ 0.7VDD (≥3.15 V min) and VIL ≤ 0.3VDD (≤1.65 V max) for reliable operation. While 3.3 V logic may meet VIL, it falls below the guaranteed VIH threshold; level-shifting or 5 V I/O buffering is required when interfacing with 3.3 V microcontrollers driving the A6276ELP's CLOCK, LATCH ENABLE, or SERIAL DATA IN pins.
A6276ELP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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-TSSOP-EP
A6276ELP FAQ
1.How can I place an order for A6276ELP through Aetrix?
Please submit a Request for Quotation (RFQ) for A6276ELP 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 A6276ELP reliable?
The price and inventory of A6276ELP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6276ELP is usually 5 days.
3.What payment methods are accepted for A6276ELP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6276ELP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6276ELP?
A6276ELP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6276ELP 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 A6276ELP?
For technical support, including A6276ELP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6276ELP requirements.
6.How does Aetrix verify that A6276ELP is sourced from the original manufacturer or authorized distributors?
All A6276ELP 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 A6276ELP meets industry standards.
7.What is the process for return or replacement of A6276ELP?
All A6276ELP units undergo pre-shipment inspection (PSI). If there is an issue with A6276ELP, 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 A6276ELP part is unused and in its original packaging.
Return procedure for A6276ELP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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