LM339 Quad Comparator IC – Precision Voltage Comparator for Industrial and Consumer Applications
について LM339 is a high-performance, low-power quad voltage comparator IC designed by テキサス・インスツルメンツ（TI）. Engineered for precision and reliability, this device is widely used in industrial control systems, automotive electronics, and consumer electronics. With its open-collector output and wide operating voltage range, it is ideal for applications requiring accurate voltage comparison and fast switching.
Manufactured by a globally trusted semiconductor leader, テキサス・インスツルメンツ, the LM339 is a proven solution for engineers and designers seeking robust analog performance in a compact package. Its ability to operate from a single or dual power supply makes it highly versatile for a broad range of analog signal processing tasks.
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Technical Specifications of LM339 Comparator IC
The following table outlines the key technical parameters of the LM339:
| パラメータ | 価値 | 説明 |
|---|---|---|
| Number of Comparators | 4 | Quad comparator configuration |
| 電源電圧範囲 | 2V to 36V (Single Supply) ±1V to ±18V (Dual Supply) |
Wide operating voltage range for flexible design |
| 入力オフセット電圧 | ±5 mV (typical) | Ensures high precision in voltage comparison |
| 入力バイアス電流 | 25 nA (typical) | Low input current for minimal loading |
| Response Time | 1.3 µs (typical) | Fast switching for time-sensitive applications |
| 出力タイプ | Open-collector | Allows wired-AND connections and level shifting |
| 動作温度範囲 | 0℃～70℃（市販品） | Suitable for standard industrial environments |
| パッケージ・オプション | SOIC, PDIP, TSSOP | Multiple package types for design flexibility |
Why Choose LM339 Over Standard Comparators?
The LM339 offers several パフォーマンスの利点 over typical voltage comparators in the market. Its quad comparator configuration reduces board space and component count, making it ideal for compact designs. The open-collector output allows for flexible interfacing with digital logic circuits and supports wired-AND configurations, which are essential in fault detection and signal monitoring systems.
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Unlike many standard comparators, the LM339 operates over a wide voltage range, supporting both single and dual supply configurations. This makes it suitable for a variety of power systems without the need for additional voltage regulation. The device’s low input bias current and offset voltage ensure 高精度 in analog signal processing, which is critical in sensor interfacing and analog-to-digital conversion applications.
According to industry experts and engineers, the LM339 is a go-to solution for reliable voltage comparison. Its proven track record in automotive and industrial systems underscores its robustness and reliability. Texas Instruments’ commitment to quality and innovation further enhances the credibility of this component in mission-critical applications.
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Typical Applications of LM339 Comparator IC
- Zero-crossing detectors
- Voltage level detectors
- Oscillators and waveform generators
- Battery monitoring systems
- Over-voltage and under-voltage protection circuits
- Sensor signal conditioning
- Window comparators
Its versatility makes it a preferred choice in automotive electronics, industrial automation, and consumer electronics. The LM339 is also widely used in educational and prototyping environments due to its ease of use and availability.
About Texas Instruments – Trusted Semiconductor Manufacturer
テキサス・インスツルメンツ（TI） is a globally recognized leader in analog and embedded processing semiconductor solutions. With decades of innovation and a strong commitment to quality, TI components are trusted by engineers and OEMs worldwide. The LM339 is part of TI’s extensive portfolio of analog ICs, known for their reliability, performance, and long-term availability.
TI’s rigorous testing and quality assurance processes ensure that every LM339 comparator meets the highest industry standards. Their global support network and comprehensive documentation make integration and design support seamless for engineers at all levels.
よくある質問（FAQ）
1. What is the main function of the LM339 comparator?
The LM339 is designed to compare two input voltages and output a digital signal indicating which input is higher. It is commonly used in analog-to-digital interfacing and signal monitoring applications.
2. Can the LM339 operate with a single power supply?
Yes, the LM339 can operate with a single supply voltage ranging from 2V to 36V, making it suitable for battery-powered and low-voltage systems without requiring dual power rails.
3. What are the benefits of the open-collector output in the LM339?
The open-collector output allows multiple comparator outputs to be connected together for logic-level interfacing. It also enables level shifting and wired-AND logic configurations, enhancing design flexibility.
4. Is the LM339 suitable for automotive applications?
Yes, the LM339 is widely used in automotive systems due to its wide voltage range, fast response time, and robust performance. It is ideal for battery monitoring, fault detection, and sensor interfacing.
5. How does the LM339 compare to other comparators in terms of power consumption?
The LM339 is a low-power device with minimal input bias current and efficient operation, making it suitable for energy-sensitive applications such as
