Overview
The ULN2074B is a quad Darlington transistor array manufactured by STMicroelectronics. It is designed to interface logic circuits with high current, high voltage loads. Each device in the array contains four NPN Darlington switches, capable of delivering up to 1.5 A of current with a minimum breakdown voltage of 50 V and a sustaining voltage of 35 V measured at 100 mA. The ULN2074B features isolated Darlington pinouts, making it suitable for applications such as emitter follower configurations. The inputs of the ULN2074B are compatible with popular 5 V logic families, enhancing its versatility in various electronic systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage (VCEX) | 50 | V |
| Output Sustaining Voltage (VCE(SUS)) | 35 | V |
| Output Current (IO) | 1.75 | A |
| Input Voltage (VI) | 15 (ULN2064B, ULN2068B), 30 (ULN2066B, ULN2074B) | V |
| Input Current (II) | 25 | mA |
| Operating Ambient Temperature Range | -20 to 85 | °C |
| Storage Temperature Range | -55 to 150 | °C |
| Power Dissipation at TPINS = 90 °C | 4.3 | W |
| Power Dissipation at TAMB = 70 °C | 1 | W |
Key Features
- Output current up to 1.5 A for each Darlington switch
- Minimum breakdown voltage of 50 V and sustaining voltage of at least 35 V
- Isolated Darlington pinouts (ULN2074B)
- Integral suppression diodes for inductive loads (ULN2064B, ULN2066B, and ULN2068B)
- Compatibility with all popular logic families (5 V logic for ULN2064B, ULN2068B, and ULN2074B; 6-15 V CMOS and PMOS for ULN2066B)
- Includes a pre-driver stage to reduce loading on the control logic (ULN2068B)
Applications
The ULN2074B is suitable for a variety of applications, including:
- Emitter follower configurations
- Driving high current, high voltage loads such as relays, solenoids, and DC motors
- LED drivers (common-anode and common-cathode configurations)
- Interface logic to inductive loads with integral suppression diodes
Q & A
- What is the maximum output current of the ULN2074B?
The maximum output current for each Darlington switch in the ULN2074B is 1.5 A.
- What is the minimum breakdown voltage of the ULN2074B?
The minimum breakdown voltage of the ULN2074B is 50 V.
- What is the sustaining voltage of the ULN2074B?
The sustaining voltage of the ULN2074B is at least 35 V measured at 100 mA.
- Are the inputs of the ULN2074B compatible with 5 V logic families?
- Does the ULN2074B feature isolated Darlington pinouts?
- What type of loads can the ULN2074B drive?
- Does the ULN2074B include integral suppression diodes?
- What is the operating ambient temperature range of the ULN2074B?
- What is the storage temperature range of the ULN2074B?
- How should the ULN2074B be mounted to ensure proper thermal management?
