Part Number: LM311DR

Manufacturer: Texas Instruments


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Technical Specifications of LM311DR

Datasheet  LM311DR datasheet
Category Integrated Circuits (ICs)
Family Linear – Comparators
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Type General Purpose
Number of Elements 1
Output Type MOS, Open-Collector, Open-Emitter, TTL
Voltage – Supply, Single/Dual (±) 3.5 V ~ 30 V, ±1.75 V ~ 15 V
Voltage – Input Offset (Max) 7.5mV @ ±15V
Current – Input Bias (Max) 0.25μA @ ±15V
Current – Output (Typ)
Current – Quiescent (Max) 7.5mA
Propagation Delay (Max)
Operating Temperature 0°C ~ 70°C
Package / Case 8-SOIC (0.154″, 3.90mm Width)
Mounting Type Surface Mount
Supplier Device Package 8-SOIC


The LM311DR, along with the LM111 and LM211, are all high-speed voltage comparators that belong to the same family. This family is known for being powerful and flexible. These devices were made to work with a wide range of power supply voltages, so they can be used in a lot of different situations. For example, operational amplifiers with 15-V supplies and logic circuits with 5-V supplies can both use these devices. Most TTL and MOS circuitry can connect to the output levels of these comparators. The LM311DR is an important part of many electrical systems because it can drive lamps, sensors, and switches with up to 50 V and 50 mA.

Key Features that Define Excellence in LM311DR

The LM311DR is more than just a voltage comparator; it’s a precise instrument with a plethora of capabilities that redefine excellence in electronic applications. These distinguishing characteristics enable the LM311DR to stand out in the world of high-speed voltage comparators.

● Fast Response Time: Enabling Instantaneous Decisions

Response time is the lifeblood of efficiency in the world of electronic applications. It specifies how quickly a device can process input changes and generate output. When split-second decisions are required, the importance of response time becomes clear. With a response time of 165 ns, the LM311DR shines in this area.

This lightning-fast performance translates into real-world benefits by enabling instantaneous analysis of input voltage variations. The LM311DR’s quick response time ensures that systems can react with precision, resulting in optimized performance and accuracy in jobs where timing is critical, such as motor control changes or sensor monitoring.

● Strobe Capability: Mastering Timing and Synchronization

With its strobe capabilities, the LM311DR goes above and beyond the conventional, introducing a layer of control over timing and synchronization. A strobe signal serves as a conductor, orchestrating whether or not the comparator’s output is active. Designers can exercise exact control over the timing of actions by controlling this strobe signal, enabling synchronized processes within a larger system. The LM311DR’s strobe feature is invaluable in developing systems that dance to the rhythm of controlled time, whether it’s coordinating many devices or ensuring that operations occur at specific intervals.

● Impressive Input Characteristics: Precision in Voltage Comparison

The LM311DR’s input characteristics set the tone for accuracy and dependability. Input bias current and input offset current are critical in ensuring that the comparator’s choices are consistent with the input signals. The importance of these qualities rests in their capacity to retain accuracy even when input variances are minor. With a maximum input bias current of 300 nA and a maximum input offset current of 70 nA, the LM311DR demonstrates its capabilities. These low values reduce interference and errors, allowing the comparator to detect minor voltage differences with pinpoint accuracy.

● Single Supply Operation: Streamlining Integration

The foundation of good electronic integration is simplicity. This notion is embodied by the LM311DR’s capacity to function continuously from a single 5-V supply. The use of a single supply reduces the need for complex power arrangements, speeding the integration process and lowering the overhead associated with handling several supplies. This capability is especially useful in applications where efficiency and simplicity of design are critical. The LM311DR’s compliance with a single supply voltage expands its application possibilities.

● Output Versatility: Adapting to Diverse Circuits

The LM311DR’s adaptability extends to its output capabilities, distinguishing it as a true team player in circuit design. The comparator’s flexibility to drive loads referred to as ground, VCC+, or VCC implies that it fits into a variety of circuit designs, adjusting to the particular demands of each case. This adaptability improves design flexibility, allowing engineers to construct systems that are most suited to their intended functions.

● Isolation and Wire-OR Connection: Enhancing Signal Management

Signal integrity is critical in electronic systems, and the LM311DR excels at it. The option to separate all inputs and outputs from the system ground reduces the danger of noise interference and ground loops while maintaining signal quality. Furthermore, the outputs of the LM311DR can be wire-OR coupled, allowing for the logical combination of several outputs. This feature increases the complexity of control and decision-making circuits, allowing designers to develop complicated and complex systems.

Application Spectrum of LM311DR

Because of its varied features, the LM311DR’s capabilities find diverse applications throughout sectors. Let us investigate its applicability in major domains:

● Industrial Automation: Precision Control

Because of its fast response time and high level of precision, the LM311DR is an extremely useful tool in industrial automation. It can assist with a variety of tasks, including the control of motors, the monitoring of processes, and the creation of safety circuits.

● Communication Systems: Reliable Signal Processing

In communication systems, trustworthy signal processing is provided by the LM311DR thanks to its compatibility with TTL and MOS circuits as well as its fast response time. This processing can be used for applications such as signal conditioning, threshold detection, and modulation/demodulation.

● Power Management: Efficient Control

The LM311DR’s load-switching capabilities and precise voltage monitoring improve power management efficiency.

● Sensor Interfaces: Accurate Sensing

The LM311DR is an ideal component for use in sensor interface circuits due to its low input bias and offset currents. This characteristic makes the LM311DR ideal for accurate and consistent detection and measurement of sensor outputs.

Because of its flexibility and performance, the LM311DR is a good choice for a wide variety of applications, including industrial automation, communication, power management, and sensor interfaces.


The LM311DR, a high-speed voltage comparator with remarkable capabilities, is a modern electronics cornerstone. Its quick response time, strobe capabilities, remarkable input characteristics, and adaptability to a wide range of supply voltages and output configurations make it an invaluable tool for a wide range of applications.

The LM311DR plays a critical role in improving accuracy, efficiency, and performance across the electronic landscape, from automation to communication, and power management to sensor interfaces. As technology progresses, the LM311DR series remains a solid choice for those looking for unrivaled precision and dependability in their electrical designs. Please contact ICRFQ, China’s largest supplier of electrical components, for more information and to make an order.

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