Overview
The ULN2004A is a high-voltage, high-current Darlington Array produced by STMicroelectronics. It contains seven open collector Darlington pairs with common emitters, each rated at 500 mA and capable of withstanding peak currents of 600 mA. This device is designed to interface with various logic families, including TTL, CMOS, PMOS, and DTL. The ULN2004A is particularly useful for driving a wide range of loads such as solenoids, relay DC motors, LED display filament lamps, thermal printheads, and high-power buffers. The inclusion of suppression diodes for inductive load driving and the strategic placement of input pins opposite to output pins simplify board layout and enhance functionality.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package Type | PDIP-16 |
| Operating Temperature Min | -40°C |
| Operating Temperature Max | 85°C |
| Output Current per Driver | 500 mA (600 mA peak) |
| Output Voltage | 50 V |
| Input Compatibility | TTL, CMOS, PMOS, DTL |
| RoHS Compliance | Ecopack2 |
Key Features
- Seven Darlington pairs per package
- Output current of 500 mA per driver (600 mA peak)
- Output voltage of 50 V
- Integrated suppression diodes for inductive loads
- Outputs can be paralleled for higher current
- Compatibility with TTL, CMOS, PMOS, and DTL logic families
- Input pins placed opposite to output pins to simplify board layout
Applications
The ULN2004A is versatile and can be used in a variety of applications, including:
- Driving solenoids and relay DC motors
- LED display and filament lamp drivers
- Thermal printhead drivers
- High-power buffer applications
- Line drivers and logic buffers
Q & A
- What is the ULN2004A?
The ULN2004A is a high-voltage, high-current Darlington Array containing seven open collector Darlington pairs with common emitters.
- What are the key applications of the ULN2004A?
The ULN2004A is used for driving solenoids, relay DC motors, LED displays, filament lamps, thermal printheads, and high-power buffers.
- What is the output current rating of the ULN2004A?
Each channel is rated at 500 mA and can withstand peak currents of 600 mA.
- What is the significance of the suppression diodes in the ULN2004A?
The suppression diodes are included for handling inductive loads, preventing kick-back voltage when the drivers are turned off.
- Is the ULN2004A compatible with different logic families?
Yes, it is compatible with TTL, CMOS, PMOS, and DTL logic families.
- What is the operating temperature range of the ULN2004A?
The operating temperature range is from -40°C to 85°C.
- What package types are available for the ULN2004A?
The ULN2004A is available in PDIP-16 and other packages such as SO-16 and TSSOP-16.
- How do the input pins simplify board layout?
The input pins are placed opposite to the output pins, which simplifies the board layout.
- Can the outputs of the ULN2004A be paralleled?
Yes, the outputs can be paralleled to achieve higher current.
- Is the ULN2004A RoHS compliant?
Yes, the ULN2004A is RoHS compliant with Ecopack2 certification.
