The UCN5801A is an 8-bit serial-input, latched source driver designed for applications requiring interface between low-level logic and high-voltage or high-current loads. Manufactured by Allegro MicroSystems, this device is often used in driving LED displays, relays, solenoids, and other similar devices. It offers a simple and efficient way to control multiple outputs from a serial data stream, reducing component count and simplifying circuit design.

Applications:

• LED matrix displays
• Relay drivers
• Solenoid drivers
• Stepper motor control (with external components)
• Thermal printers
• Logic Buffers

Features:

• 8-bit serial-input, latched source driver
• High output voltage (up to 80 V)
• High output current (up to 500 mA per output)
• Serial data input with strobe and output enable
• Internal clamp diodes for inductive load protection
• TTL, DTL, CMOS compatible inputs

Benefits:

• Simplified interface to microprocessors and microcontrollers
• Reduced component count and board space
• High output voltage and current capabilities
• Easy control of multiple outputs from a serial data stream
• Protection against voltage transients from inductive loads

Additional Details:

The UCN5801A includes internal clamp diodes to protect the device from voltage spikes generated when switching inductive loads. This eliminates the need for external flyback diodes, simplifying the design and reducing component count. The inputs are compatible with standard TTL, DTL, and CMOS logic levels, allowing for easy integration into a wide range of digital systems. The serial input interface minimizes the number of control lines required from the host microcontroller. A serial data input, a strobe input, and an output enable input control the operation of the device.

The high voltage and current capabilities make the UCN5801A suitable for a variety of industrial and consumer applications. The serial input simplifies the wiring and reduces the number of pins required on the microcontroller or microprocessor. The latched outputs ensure that the outputs remain in a stable state until new data is clocked into the device. Proper heat sinking may be required if all channels are driven at maximum current simultaneously.