Understanding the A68064 Datasheet: A Guide to the DABIC-5 64-Bit Serial-Input Latched Sink Driver
If you are digging into the A68064 datasheet, you are likely working on a project that requires controlling a high volume of LEDs or thermal printhead elements. Manufactured by Allegro MicroSystems, the A68064 is a powerhouse in the world of large-scale peripheral power management. What is the A68064?
The A68064 is a 64-bit serial-input latched sink driver. In simpler terms, it acts as a bridge between low-power logic (like a microcontroller) and high-power loads. It uses Allegro’s proprietary DABIC-5 (Digital/Analog BiCMOS) process, which allows it to combine high-speed CMOS shift registers and latches with high-voltage bipolar output drivers on a single chip. Key Features and Specifications
When you open the datasheet, several critical parameters define the device’s performance:
64-Bit Capacity: It can control 64 individual outputs simultaneously. This is ideal for reducing the number of control lines needed in complex systems.
High-Voltage Outputs: The sink drivers are typically rated for up to 40V, allowing you to drive significant loads without damaging the chip.
Output Current: Each output is generally capable of sinking up to 100mA. Note that thermal limitations of the package usually prevent all 64 outputs from sinking 100mA at the same time.
High-Speed Operation: The CMOS shift registers can handle data clock rates up to 25 MHz, making it suitable for applications requiring fast refresh rates.
Serial-to-Parallel Conversion: It uses a standard serial data input. You clock in 64 bits of data, and upon a "Latch" signal, those bits are transferred to the outputs. Pinout and Connectivity a68064 datasheet
The A68064 typically comes in high-density packages like the TQFP (Thin Quad Flat Pack) to accommodate the 64 output pins plus power and control lines. Key pins to look for in the datasheet include: VDD: The logic supply voltage (usually 3.3V or 5V).
Clock (CLK): Shifts data into the internal register on the rising edge.
Serial Data In (SDI): The pin where you send your bitstream.
Serial Data Out (SDO): Used for "daisy-chaining" multiple A68064 chips together to control 128, 192, or more outputs.
Output Enable (OE): A global control that turns all outputs on or off regardless of the latched data. Out 0 to Out 63: The 64 open-collector sink outputs. Common Applications
Because of its high density, the A68064 is most commonly found in:
Thermal Printheads: Controlling the heating elements in receipt or label printers.
LED Video Displays: Driving large-scale signage where individual pixel control is necessary. Understanding the A68064 Datasheet: A Guide to the
Industrial Automation: Acting as an interface for relays, solenoids, or small motors. Design Considerations
When designing with the A68064, pay close attention to the Power Dissipation section of the datasheet. While the chip can sink current on all 64 channels, the cumulative heat can be substantial. Engineers often use Pulse Width Modulation (PWM) on the Output Enable (OE) pin to control brightness or power consumption and stay within safe thermal limits.
The A68064 is a robust, efficient solution for high-density power switching. By consolidating 64 channels into a single serial-controlled package, it simplifies PCB layout and reduces the overhead on your MCU.
is a semiconductor component, most commonly identified as a high-performance N-channel MOSFET or a specialized latch driver IC , typically manufactured by (now part of Littelfuse). It is primarily housed in a TO-220 package
, which is designed for efficient heat dissipation in power-switching and industrial automation applications. Key Specifications & Applications Component Type: High-performance N-channel MOSFET or Sink/Latch Driver IC. Package Type: (standard through-hole power package). Primary Uses:
Power management, motor control, industrial automation, and LCD display driver circuits. Manufacturer: Teccor Electronics / Littelfuse Datasheet & Technical Resources
While full PDF downloads are often hosted on distributor-specific portals, you can view technical summaries and request datasheets through the following verified platforms: Detailed Overview: View specifications on Inventory & Technical Data: Check availability and parameters at Veswin Electronics Jotrin Electronics PDF Search: General search for the PDF version is available on Alldatasheet full PDF datasheet
to check specific pinout voltages, or are you trying to find a compatible replacement for a repair? A68064 Teccor - Xecor Reduce output current per channel (e
A frequently overlooked section of the a68064 datasheet is thermal design. The device dissipates power primarily through output transistor saturation:
PD = ∑ (VCE(sat) × IOUT(n)) + (VDD × IDD)
For example, with 8 outputs at 250 mA each and VCE(sat) = 0.9V: PD = 8 × (0.9 × 0.25) + (5 × 0.01) ≈ 1.8 W
In a DIP package with θJA = 65°C/W, the junction temperature rise is 117°C above ambient—exceeding the limit. Thus, you must:
In the world of power electronics and motor control, few components are as versatile and reliable as the A68064. Whether you are an embedded systems engineer, a robotics hobbyist, or a student working on a senior design project, the A68064 datasheet is your definitive reference for understanding this integrated circuit’s capabilities. This article serves as an extensive breakdown of the A68064 datasheet, covering electrical characteristics, pin configurations, thermal management, and real-world application circuits.
The A68064, manufactured by Allegro MicroSystems (now part of Infineon’s portfolio in certain product lines), is a serial-input, latched source driver designed for demanding loads like relays, solenoids, LEDs, and small stepper motors. It is part of the popular A6800 series, renowned for high-voltage, high-current sinking and sourcing capabilities with a simple serial interface.
The datasheet provides two sets of specs: logic and output.
The A68064 is a high-performance mixed-signal microcontroller (MCU) family intended for embedded applications requiring low power, flexible I/O, and integrated analog peripherals. This article summarizes the device’s main features, typical electrical characteristics, functional blocks, and common application scenarios to help engineers evaluate suitability and accelerate design integration.