ULN2003ADR: A Powerful Chip that Drives High Current Loads
04 January 2024
Ⅱ. Symbol, footprint and pin configuration of ULN2003ADR
Ⅲ. Specifications of ULN2003ADR
Ⅳ. What are the application fields of ULN2003ADR?
Ⅴ. Simplified block diagram of ULN2003ADR
Ⅵ. How to correctly connect the ULN2003ADR chip?
Ⅶ. Does ULN2003ADR require an external power supply?
Ⅷ. What is the difference between ULN2003ADR and ULN2003A?
The ULN2003ADR stands out as a Darlington transistor array designed for high voltage and current applications. With its notable features such as high current gain, wide operating voltage range, robust load capacity, and more, this driver chip proves ideal for a range of systems that demand high-speed and high-power driving. It is widely used in control circuits such as PLC, intelligent instruments, microcontrollers, and digital output cards. This article mainly introduces the basic concepts, specifications and application fields of ULN2003ADR as well as comparisons with other models so that you can better understand this chip.
The ULN2003ADR is an NPN transistor driver chip in a dual in-line 16-pin package consisting of seven silicon NPN Darlington tubes and a coil-canceling reverse potential diode. It has an open collector output with an allowable pass current of 200mA at the output, a saturation voltage VCE of about 1 V and a withstand voltage BVCEO of about 36 V. It can therefore directly drive relays as well as low-voltage circuits. The chip has an aggregate current of 500 mA, an output voltage of 50 V, an input voltage of 30 V, and a termination current of 2.5 A. In addition, the chip has a storage temperature range of 65°C to 150°C and an operating temperature range of 20°C to 70°C. It uses different package types in different temperature ranges. When the temperature range is between 20°C and 70°C, the chip is packaged in SOIC package, which requires 2500 reels; when the temperature range is between 40°C and 85°C, the chip is packaged in PDIP package, which requires 40 electron tubes.
Alternatives and equivalents:
The figure shows the symbol, footprint and pin configuration of ULN2003ADR respectively. Among them, it has 16 pins, and their pin names and functions are as follows:
Pin 1 to Pin 7: These pins are the CPU pulse input terminals, used to receive external input pulse signals.
Pin 8: This is the ground terminal, used to connect the chip to ground.
Pin 9: This pin is the common terminal of the cathode of the seven internal freewheeling diodes. The anode of each diode is connected to the collector of each Darlington tube. When used for inductive loads, this pin is connected to the positive pole of the load power supply to achieve freewheeling. If this pin is connected to ground, it is actually the collector of the Darlington tube that is connected to ground.
Pin 10 to Pin 16: These pins are pulse signal output terminals, corresponding to signal input terminals 1 to 7, used to drive loads.
• Part Status: Active
• Manufacturer: Texas Instruments
• Length: 9.9 mm
• Width: 3.91 mm
• Height: 1.58mm
• Package / Case: SOIC-Narrow-16
• Packaging: Reel / Cut Tape
• Configuration: Array 7
• Transistor Polarity: NPN
• Operating Temperature: -20°C ~ 70°C
• Pin Count: 16
• Mounting Style: SMD/SMT
• Product Category: Darlington Transistors
ULN2003ADR is mainly used in the following fields:
• Automotive electronics: This chip has functions such as car wiper control and car electric window control, which can provide drivers with a clearer and safer driving environment. It uses advanced manufacturing technology to achieve high voltage and high current control, greatly improving the performance and reliability of automotive electronic systems.
• LED matrix control: This chip can be used to control the LED matrix on and off. It controls the brightness and color of each LED light in the LED matrix by controlling the conduction and cut-off of the switching diode. It can achieve high-precision LED matrix control and improve the display effect of the system.
• Relay drive: ULN2003ADR can be used to control the switching of relays by controlling the on and off of switching diodes. This design can realize relay driving of high voltage and high current, improving the reliability of the system.
• Stepper motor control: The ULN2003ADR is commonly used in stepper motor controllers. It controls the direction of rotation and speed of the stepper motor by controlling the conduction and cutoff of the switching diode. Compared with traditional stepper motor controllers, the ULN2003ADR has higher control accuracy and lower power consumption, and can directly drive stepper motors, reducing the use of external components, thus reducing overall costs and improving reliability.
Before connecting the ULN2003ADR chip, we need to specify the type of load to be driven (e.g., relay, motor, etc.) as well as the required drive current and voltage. We prepare the necessary components such as resistors, capacitors, diodes, etc., as well as a suitable circuit board according to the circuit design requirements. Next, we provide a stable power supply and ground for the ULN2003ADR chip to ensure that the supply voltage meets the chip's requirements. We connect the external input pulse signals to the inputs of the ULN2003ADR chip (pin 1 to pin 7), and select the signal lines for connection according to the actual situation. And according to the type of load and drive requirements to connect the output of ULN2003ADR chip (pin 10 to pin 16) to the corresponding load. If it is an inductive load, we need to access a suitable current-continuing diode at the output. Finally, we double-check that the circuit is connected correctly and make sure that the power supply, input signal, load and other parts are connected correctly. Before formal use, we carry out testing and debugging to ensure that the ULN2003ADR chip can work properly as well as drive the load to operate as expected.
The ULN2003ADR is a high voltage electronic device that is commonly used to drive various types of loads. Since the chip requires sufficient current to drive the load, it requires an external power supply. Before using ULN2003ADR, we need to know its power supply voltage and current requirements, which will help you to configure the power supply and loads correctly, so as to ensure that ULN2003ADR can work properly and provide enough current to drive the loads. In addition, we also need to note that the ULN2003ADR supply voltage and current requirements may vary depending on the device model and specifications, so we need to consult the datasheet for the specific device model.
The ULN2003A is a Darlington tube and the ULN2003ADR is an improved version of it. The main difference between the two is the package and voltage withstand. the ULN2003ADR is available in a SOP8 package for high density mounting. In terms of performance, it has a 15 percent lower back-peak voltage and a 7.6 percent increase in overall drive capability. Therefore, if higher integration, smaller board footprint and better performance are required, we can choose the ULN2003ADR.
Frequently Asked Questions
1. What is the replacement and equivalent of ULN2003ADR?
You can replace the ULN2003ADR with the ULN2003AD, ULN2004AD, ULN2004ADR or ULQ2003AQDRQ1.
2. What is Darlington transistor array?
The Darlington transistor is a compound structure consisting of two bipolar transistors connected in such a way that the current amplified by the first transistor is amplified further by the second one.
3. What is ULN2003 used for?
This ULN2003 Stepper motor Drive module is used to drive stepper motors, high current LEDs and relay modules.
4. What is ULN2003ADR?
ULN2003ADR is an integrated circuit (IC) that contains seven high-voltage, high-current Darlington transistor arrays. It is commonly used for driving inductive loads such as stepper motors, relays, and solenoids.
