ULN2003APG
Seven-channel Darlington transistors for driver applications, 50V, 500mA
Manufacturer： toshiba
series introduction
# ULN2003APG Product Series Introduction
## 1. Overview
The ULN2003APG is a highly popular and widely used integrated circuit product series belonging to the family of high - voltage, high - current Darlington transistor arrays. It is specifically designed to drive inductive loads such as relays, solenoids, stepper motors, and other devices that require relatively high current and voltage for proper operation. This product series offers a convenient and cost - effective solution for interfacing low - power control signals from microcontrollers, logic circuits, or other low - current sources with high - power loads.
## 2. Key Features
### 2.1 High - Voltage and High - Current Capability
- **Voltage Rating**: The ULN2003APG can handle a maximum collector - emitter voltage (VCEO) of up to 50V. This high - voltage tolerance allows it to drive loads that operate at relatively high voltages, making it suitable for a wide range of industrial and consumer applications.
- **Current Rating**: Each Darlington pair in the ULN2003APG can sink a continuous collector current (IC) of up to 500mA. In addition, it can handle peak currents of up to 600mA for short durations. This high - current handling capacity enables it to drive power - hungry loads such as large relays and solenoids.
### 2.2 Darlington Transistor Configuration
- **High Current Gain**: The Darlington transistor configuration used in the ULN2003APG provides a very high current gain (hFE). This means that a small input current from a low - power control source can be amplified to a much larger output current, allowing for efficient control of high - power loads.
- **Low Input Current Requirement**: Due to the high current gain, the ULN2003APG requires only a small input current to turn on the output transistors. This makes it easy to interface with microcontrollers and other low - current logic devices, which typically have limited output current capabilities.
### 2.3 Built - in Flyback Diodes
- **Protection for Inductive Loads**: Inductive loads such as relays and solenoids generate a back - EMF (electromotive force) when the current through them is suddenly interrupted. The ULN2003APG has built - in flyback diodes across each Darlington pair. These diodes provide a path for the back - EMF current to flow, protecting the integrated circuit and other components in the circuit from damage caused by the high - voltage spikes generated by the inductive loads.
### 2.4 Compatibility with TTL and CMOS Logic
- **Wide Input Voltage Range**: The ULN2003APG has an input voltage range that is compatible with both TTL (Transistor - Transistor Logic) and CMOS (Complementary Metal - Oxide - Semiconductor) logic levels. This allows it to be easily integrated into various digital control systems, regardless of the type of logic family used in the control circuit.
## 3. Package and Pinout
### 3.1 Package Type
The ULN2003APG is typically available in a 16 - pin DIP (Dual In - Line Package) or SOIC (Small Outline Integrated Circuit) package. The DIP package is suitable for through - hole PCB (Printed Circuit Board) assembly, which is commonly used in prototyping and some industrial applications. The SOIC package, on the other hand, is more suitable for surface - mount PCB assembly, which is widely used in modern electronic devices due to its smaller size and better compatibility with automated assembly processes.
### 3.2 Pinout
- **Input Pins (Pins 1 -
Images for reference
16-DIP SOT38-1
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