Overview
The ULQ2803A, produced by STMicroelectronics, is an integrated circuit that contains eight Darlington transistors with common emitters and integral suppression diodes. This device is designed to handle inductive loads and is part of a family of Darlington arrays that include the ULQ2801A, ULQ2802A, and ULQ2804A. The ULQ2803A is specifically tailored for interfacing with 5 V TTL and CMOS logic families, featuring a 2.7 kΩ input resistor. Each Darlington transistor in the array can handle a peak load current of 600 mA (500 mA continuous) and can withstand up to 50 V in the off state. The outputs can be paralleled to achieve higher current capabilities, and the device is supplied in an 18-lead plastic DIP package with a convenient input-opposite-output pinout to simplify board layout.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage (VO) | 50 | V |
| Input Voltage (VI) | 30 | V |
| Continuous Collector Current (IC) | 500 | mA |
| Continuous Base Current (IB) | 25 | mA |
| Power Dissipation (one Darlington pair) | 1 | W |
| Power Dissipation (total package) | 2.25 | W |
| Operating Ambient Temperature Range (TA) | -40 to 105 | °C |
| Storage Temperature Range (TSTG) | -55 to 150 | °C |
| Thermal Resistance Junction-Ambient (RthJA) | 55 | °C/W |
| Input Resistor (for ULQ2803A) | 2.7 kΩ |
Key Features
- Eight Darlington transistors per package
- Extended temperature range: -40 to 105 °C
- Output current up to 500 mA
- Output voltage up to 50 V
- Integral suppression diodes for inductive loads
- Versions for all popular logic families (TTL, CMOS, PMOS)
- Outputs can be paralleled for higher current capability
- Inputs pinned opposite outputs to simplify board layout
Applications
The ULQ2803A is suitable for a variety of applications that require high current drive capabilities and compatibility with standard logic families. These include:
- Industrial control systems
- Automotive systems (non-critical applications)
- Power supplies and switching circuits
- Relay and solenoid drivers
- LED drivers and display systems
Q & A
- What is the ULQ2803A?
The ULQ2803A is an integrated circuit containing eight Darlington transistors with common emitters and integral suppression diodes, designed for interfacing with 5 V TTL and CMOS logic families.
- What is the maximum output current of the ULQ2803A?
The maximum continuous output current is 500 mA, with a peak load current rating of 600 mA.
- What is the operating temperature range of the ULQ2803A?
The operating ambient temperature range is -40 to 105 °C.
- Can the outputs of the ULQ2803A be paralleled?
- What type of package is the ULQ2803A supplied in?
The device is supplied in an 18-lead plastic DIP package.
- What is the purpose of the integral suppression diodes in the ULQ2803A?
The integral suppression diodes are for protecting the device from inductive loads.
- How does the input resistor value vary among different versions of the ULQ2801A-ULQ2804A family?
The input resistor values vary to accommodate different logic families: 2.7 kΩ for ULQ2803A (5 V TTL and CMOS), 10.5 kΩ for ULQ2802A (14-25 V PMOS), and 10.5 kΩ for ULQ2804A (6-15 V CMOS).
- What is the thermal resistance junction-ambient (RthJA) of the ULQ2803A?
The thermal resistance junction-ambient (RthJA) is 55 °C/W.
- Is the ULQ2803A RoHS compliant?
- What are some typical applications of the ULQ2803A?
Typical applications include industrial control systems, automotive systems, power supplies, relay and solenoid drivers, and LED drivers.
