ULN2004APG
7-channel Darlington transistor ICs for high-current switching applications
Manufacturer： toshiba
series introduction
# ULN2004APG Product Series Introduction
## 1. Overview
The ULN2004APG is a highly versatile and widely used integrated circuit belonging to the ULN2004 family. It is specifically designed as a high - voltage, high - current Darlington transistor array. This product series is engineered to provide a reliable and efficient solution for driving various types of loads in a multitude of electronic applications.
## 2. Key Features
### 2.1 High Voltage and Current Capability
- **Voltage Rating**: The ULN2004APG can handle high voltages, typically with a maximum collector - emitter voltage (VCEO) of up to 50V. This high - voltage tolerance allows it to be used in applications where the load requires a relatively large voltage supply, such as in industrial control systems and automotive electronics.
- **Current Rating**: It has a high - current output capacity. Each Darlington pair in the array can sink up to 500mA of continuous current, and it can handle peak currents of up to 600mA. This makes it suitable for driving power - hungry loads like relays, solenoids, and stepper motors.
### 2.2 Darlington Transistor Configuration
- **High Gain**: The Darlington transistor configuration used in the ULN2004APG offers a very high current gain. This means that a relatively small input current can control a much larger output current. For example, the typical current gain (hFE) of the Darlington pairs in this device is in the range of several thousand. This high gain simplifies the design of the driving circuit, as it reduces the need for complex current - amplification stages.
- **Low Input Current Requirement**: Due to the high gain, the input current required to drive the ULN2004APG is very small. This makes it compatible with low - power output devices such as microcontrollers and logic gates, which can easily provide the necessary input signals without significant power consumption.
### 2.3 Built - in Flyback Diodes
- **Inductive Load Protection**: The ULN2004APG comes with built - in flyback diodes for each Darlington pair. These diodes are essential when driving inductive loads such as relays and solenoids. When the current through an inductive load is suddenly interrupted, a large back - EMF (electromotive force) is generated, which can damage the driving circuit. The flyback diodes provide a path for the induced current, protecting the ULN2004APG and other components in the circuit from the harmful effects of the back - EMF.
### 2.4 Compatibility
- **Logic - Level Inputs**: The input pins of the ULN2004APG are designed to be compatible with standard TTL (Transistor - Transistor Logic) and CMOS (Complementary Metal - Oxide - Semiconductor) logic levels. This means that it can be easily interfaced with a wide range of digital control circuits, including microcontrollers, programmable logic controllers (PLCs), and other digital signal processing devices.
## 3. Package and Pinout
### 3.1 Package Type
The ULN2004APG is available in a 16 - pin plastic dual - in - line package (DIP). The DIP package is a popular choice in the electronics industry due to its ease of use in prototyping and through - hole PCB (Printed Circuit Board) assembly. It provides good mechanical stability and is suitable for both manual and automated assembly processes.
### 3.2 Pinout Description
- **Input Pins (Pins 1 - 7)**: These pins are used to receive the input signals from the control circuit. Each input pin
Images for reference
16-DIP SOT38-1