The UDN3625MH is a quad high-current Darlington switch array designed for interfacing low-level logic circuitry to high-current or high-voltage loads. Manufactured by Allegro MicroSystems, this device is well-suited for a variety of applications where multiple high-power loads need to be controlled from a single logic source. It is known for its robust design and reliable performance in demanding environments.

Applications

• Driving relays
• Driving solenoids
• Driving incandescent displays
• Driving small DC motors
• Logic Buffers

Features

• Quad Darlington switch outputs
• High output current capability: up to 500 mA per channel
• High output voltage capability: up to 50 V
• TTL, DTL, and CMOS compatible inputs
• Internal suppression diodes for inductive loads
• Low input current requirements
• Operating Temperature Range: -20°C to +85°C

Benefits

• Simplified interface between logic circuits and high-power loads
• Reduced component count due to integrated Darlington arrays
• Protection against voltage spikes from inductive loads
• Increased system reliability due to robust design
• Versatile solution for a wide range of applications

Additional Details

The UDN3625MH integrates four independent Darlington transistor switches into a single package. Each Darlington pair consists of two transistors connected in such a way that the current amplified by the first transistor is further amplified by the second. This configuration provides a very high current gain, allowing the device to drive high-current loads with relatively low input currents. Internal suppression diodes are included to protect the device from voltage transients caused by inductive loads, such as relays and solenoids. The device is designed to be compatible with TTL, DTL, and CMOS logic levels, making it easy to interface with a wide range of microcontrollers and other logic devices. The UDN3625MH comes in a through-hole package, allowing for easy mounting and connection to external circuitry. Proper heat sinking may be required when operating at high current levels to prevent overheating.

The part is typically available in a DIP (Dual In-line Package).