Overview
The ULN2805A, produced by STMicroelectronics, is part of a series of eight Darlington transistor arrays designed for driving inductive loads. These arrays are particularly useful in applications requiring high current and voltage handling capabilities. The ULN2805A is one of the variants in the ULN2801A to ULN2805A series, each tailored for different logic families and voltage requirements.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage (VO) | 50 | V |
| Continuous Collector Current (IC) | 500 | mA |
| Continuous Base Current (IB) | 25 | mA |
| Power Dissipation (one Darlington pair) | 1 | W |
| Total Package Power Dissipation | 2.25 | W |
| Operating Ambient Temperature Range | -20 to 85 | °C |
| Storage Temperature Range | -55 to 150 | °C |
| Junction Temperature Range | -20 to 150 | °C |
| Thermal Resistance Junction-Ambient | 55 | °C/W |
| Collector-Emitter Saturation Voltage (VCE(SAT)) | 0.9 - 1.6 | V |
| Input Current (II(ON)) | 0.35 - 1.45 | mA |
| Input Voltage (VI(ON)) | 2.4 - 8 | V |
Key Features
- Eight Darlington transistors with common emitters and integral suppression diodes for inductive loads.
- Output current up to 500 mA and output voltage up to 50 V.
- Versions available for interfacing with different logic families (e.g., TTL, CMOS, PMOS).
- Outputs can be paralleled for higher current capability.
- Inputs pinned opposite outputs to simplify board layout.
- Supplied in an 18-lead plastic DIP package with a copper lead form.
Applications
- Driving relays, solenoids, and other inductive loads.
- Interface between low-level logic circuits and high-current loads.
- Motor control and power switching applications.
- Automotive and industrial control systems.
Q & A
- What is the maximum output voltage of the ULN2805A?
The maximum output voltage is 50 V. - What is the continuous collector current rating of the ULN2805A?
The continuous collector current rating is 500 mA. - What types of logic families can the ULN2805A interface with?
The ULN2805A can interface with TTL, CMOS, and PMOS logic families. - Can the outputs of the ULN2805A be paralleled?
Yes, the outputs can be paralleled for higher current capability. - What is the package type of the ULN2805A?
The ULN2805A is supplied in an 18-lead plastic DIP package. - What is the thermal resistance junction-ambient of the ULN2805A?
The thermal resistance junction-ambient is 55 °C/W. - What is the collector-emitter saturation voltage range of the ULN2805A?
The collector-emitter saturation voltage range is 0.9 to 1.6 V. - What is the operating ambient temperature range of the ULN2805A?
The operating ambient temperature range is -20 to 85 °C. - What is the storage temperature range of the ULN2805A?
The storage temperature range is -55 to 150 °C. - What is the junction temperature range of the ULN2805A?
The junction temperature range is -20 to 150 °C.
