The LM339DR 2G is a product from Texas Instruments (TI), which is a global semiconductor company. It is part of the LM339 series, a quad comparator with open-collector output. The "DR" in the part number indicates the specific package type (which in this case is an SOIC-14), and "2G" refers to the reel packaging for the product.
Package Type:
LM339DR2G comes in a SOIC-14 package, which is a Surface Mount Package (SMD). This package has 14 pins in total.Pin Function Specifications:
Pinout Table for LM339DR2G (SOIC-14): Pin No. Pin Name Function Description 1 Vcc Positive Supply Voltage (5V to 36V) 2 Inverting Input 1 (−) Inverting input of the first comparator. Connect to the voltage to be compared. 3 Non-inverting Input 1 (+) Non-inverting input of the first comparator. Connect to the second voltage for comparison. 4 Output 1 Output of the first comparator. The open-collector output gives a low level when active. 5 GND Ground. Connect to the system ground. 6 Inverting Input 2 (−) Inverting input of the second comparator. 7 Non-inverting Input 2 (+) Non-inverting input of the second comparator. 8 Output 2 Output of the second comparator. The open-collector output gives a low level when active. 9 Inverting Input 3 (−) Inverting input of the third comparator. 10 Non-inverting Input 3 (+) Non-inverting input of the third comparator. 11 Output 3 Output of the third comparator. The open-collector output gives a low level when active. 12 Inverting Input 4 (−) Inverting input of the fourth comparator. 13 Non-inverting Input 4 (+) Non-inverting input of the fourth comparator. 14 Output 4 Output of the fourth comparator. The open-collector output gives a low level when active.Circuit Principle:
The LM339 is a quad comparator IC, meaning it contains four independent comparators. A comparator is a device that compares two input voltages and outputs a corresponding signal based on the comparison. The LM339 has an open-collector output, meaning the output transistor will either be in a conducting (low) or non-conducting (high) state.
The comparators work by comparing the voltages applied to their inverting (−) and non-inverting (+) inputs. When the non-inverting input voltage exceeds the inverting input voltage, the output will be low (on). If the inverting input voltage is higher, the output will be high (off). Open-collector output means that external pull-up resistors are necessary to bring the output to a high state.Pin Function Details:
Vcc: This pin is the positive supply voltage input. It must be connected to a voltage source within the range of 5V to 36V.
Inverting and Non-Inverting Inputs: These pins are used to feed the voltages that are being compared. For each comparator, there are two inputs: the inverting (−) and the non-inverting (+) inputs.
Output: The output pins are open-collector. When the output is active, it will pull the output to low. An external pull-up resistor is required to pull the output to a high state when inactive.
GND: The ground pin must be connected to the system ground to complete the electrical circuit.
FAQ (Frequently Asked Questions):
1. What is the supply voltage range for LM339DR2G? Answer: The supply voltage for LM339DR2G can range from 5V to 36V. 2. How many comparators are there in the LM339DR2G? Answer: The LM339DR2G contains 4 independent comparators. 3. What type of output does the LM339DR2G have? Answer: The LM339DR2G has an open-collector output, which requires an external pull-up resistor. 4. Can the LM339DR2G be used for single-supply applications? Answer: Yes, the LM339DR2G can be used with a single supply voltage, as long as it is within the recommended range of 5V to 36V. 5. What is the typical response time for the LM339DR2G? Answer: The response time for the LM339DR2G is typically 1 microsecond. 6. How do I use the LM339DR2G in a comparator circuit? Answer: To use the LM339DR2G, connect the voltage you want to compare to the input pins and connect a pull-up resistor to the output. The output will switch low when the non-inverting input exceeds the inverting input. 7. What is the recommended load resistance for the output of LM339DR2G? Answer: The recommended load resistance is typically 10kΩ to 100kΩ, depending on the supply voltage. 8. What happens when the non-inverting input voltage is higher than the inverting input voltage? Answer: When the non-inverting input voltage exceeds the inverting input voltage, the output will be pulled low (active). 9. Can I use the LM339DR2G in a low-voltage system? Answer: Yes, the LM339DR2G can operate with low voltage, starting from 5V. 10. What is the maximum input voltage for the LM339DR2G? Answer: The input voltage must not exceed Vcc + 0.3V for the LM339DR2G to prevent damage. 11. How do I connect the LM339DR2G in a window comparator configuration? Answer: In a window comparator configuration, you can use two LM339 comparators. One comparator compares the upper threshold, and the other compares the lower threshold. 12. Is the LM339DR2G capable of handling both analog and digital signals? Answer: Yes, the LM339DR2G can handle both analog and digital signals, as long as the voltage levels are within the input range. 13. Can the LM339DR2G be used to compare currents? Answer: No, the LM339DR2G is designed to compare voltages, not currents. 14. What is the output state when the input voltage difference is zero? Answer: When the input voltage difference is zero, the output state is undefined, as the comparator will not be able to distinguish the two inputs. 15. How do I ensure the LM339DR2G comparator is properly biased? Answer: To bias the LM339DR2G, ensure that the Vcc and ground pins are correctly connected, and use pull-up resistors on the output. 16. Can the LM339DR2G be used in pulse-width modulation (PWM) circuits? Answer: Yes, the LM339DR2G can be used in PWM circuits by comparing a reference voltage to a varying signal, such as a triangular waveform. 17. What is the typical output behavior in a voltage comparison circuit? Answer: The output will be low (active) when the non-inverting input exceeds the inverting input, and high (inactive) when the inverting input exceeds the non-inverting input. 18. How do I set a reference voltage for the LM339DR2G? Answer: You can set a reference voltage using a voltage divider or by providing a fixed voltage to the non-inverting or inverting input pin. 19. How do I prevent noise from affecting the LM339DR2G? Answer: Use proper decoupling capacitor s near the power supply pins and ensure clean signal sources for the input pins. 20. Is the LM339DR2G available in different package types? Answer: Yes, the LM339 is available in different package types, such as the SOIC-14, PDIP-14, and others.Conclusion:
The LM339DR2G is a versatile quad comparator with 14 pins. The key features are its open-collector outputs and ability to handle a range of voltages. The pinout and functionality of each pin have been clearly outlined, and the FAQ section answers common questions about its operation.
