on October 17th 248

LM311N Voltage Comparator: Features, Pinout, and Datasheet

The LM311N stands out as a sophisticated, multifaceted voltage comparator delivering impressive performance across a wide range of applications. Whether in the design of complex circuitry or enhancing existing designs, a deep understanding of its full potential can spark innovative and efficient solutions. From understanding its basic operation to exploring its integration in complex circuit designs, this article will provide comprehensive insights, equipping you with a profound understanding of how to harness the full potential of this sophisticated component. Whether you're enhancing current designs or embarking on new projects, understanding the LM311N can spark innovative solutions and drive efficiency in your applications.

Catalog

What is the LM311N?

The LM311N is a highly adaptable voltage comparator designed for low input current requirements, performing smoothly across a wide power supply spectrum from ±15V operational amplifiers to a simpler +5V supply for IC logic. This comparator integrates effortlessly with various circuits, such as RTL-DTL, TTL, and MOS technologies. Capable of switching voltages up to +50V and managing an output current of 50mA, the LM311N finds its place in numerous electronic applications that demand precise voltage comparison. The LM311N showcases its compatibility with multiple circuit families: RTL-DTL, TTL, and MOS. This flexibility broadens its application across a multitude of analog and digital systems.

LM311N Alternatives

• LM339

• MAX941

LM311N Pinout Configuration

Pin Number	Pin Name	Description
4	Offset Null	Allows manual adjustment to fine-tune the offset voltage of the comparator. Connect a potentiometer between this pin and the positive rail to enhance accuracy.
3	Inverting Input (V-)	Acts as one terminal for differential voltage input. The output transitions to the low state when voltage at this pin exceeds that at the non-inverting input.
2	Non-Inverting Input (V+)	Functions as the second terminal for differential voltage input. A higher voltage at this pin compared to the inverting input results in a high output state.
1	Ground (GND)	Provides the reference point for all voltages within the comparator, essential for maintaining a common ground and stable circuit operations.
5	Balance	Fine-tunes the balance between the inverting and non-inverting inputs. Connect a resistor between this pin and the output to manage differences and boost stability.
7	Output	Outputs the comparator’s result, interfacing with external devices to relay decisions. Connect to a microcontroller or logic device for automated responses.
8	VCC (Positive Supply)	Linked to the positive power supply, it provides essential voltage for the comparator's operation. Ensure robust power supply filtering to minimize interference.
6	Strobe	Temporarily disables the comparator output, setting it in a known state irrespective of input conditions. Useful in low-power applications or during test modes.

LM311N Symbol, Footprint, and CAD Model

Features of the LM311N

Input Characteristics

The LM311N ensures precise operation by maintaining a maximum input current of 150nA. Its offset current is capped at 20nA, contributing to its exceptional accuracy. The differential input voltage range spans ±30V, providing versatility in handling various input signals. This wide range showcases its capacity to adapt to diverse electrical environments.

Power Consumption and Supply Requirements

Operating at ±15V, the LM311N's power consumption stands at 135mW, indicative of its energy efficiency. The broad power supply voltage range from +5V to ±15V affords flexibility in different operating scenarios. This adaptability is valuable when designing systems that must accommodate varying power supply levels. In practice, systems prioritizing energy efficiency often find this component's power characteristics highly beneficial.

Output Capabilities

With the ability to support an output current of up to 50mA, the LM311N shows robust performance. This capability is use in applications where maintaining consistent output current is important. Practical applications demonstrate that the component's ability to deliver stable output current without compromising on performance.

Efficiency and Adaptability

Combining these attributes, the LM311N stands out as a highly efficient and adaptable component suitable for a wide array of electronic designs. Detailed analysis and practical feedback illustrate that components boasting a harmonious balance between performance and efficiency, like the LM311N, are well-suited to evolving demands in electronic design.

LM311N Specifications

Type	Parameter
Mount	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Weight	4.535924g
Operating Temperature	0°C ~ 70°C
JESD-609 Code	e3
Moisture Sensitivity Level (MSL)	1 (Unlimited)
ECCN Code	EAR99
Terminal Finish	Matte Tin (Sn)
Terminal Position	DUAL
Supply Voltage	15V
Base Part Number	LM311
Output Type	DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL
Number of Circuits	1
Mounting Type	Through Hole
Number of Pins	8
Number of Elements	1
Packaging	Tube
Part Status	Obsolete
Number of Terminations	8
Max Power Dissipation	1.25W
Number of Functions	1
Terminal Pitch	2.54mm
Pin Count	8
Operating Supply Voltage	28V
Nominal Supply Current	7.5mA
Power Dissipation	1.25W
Max Supply Current	6mA
Quiescent Current	7.5mA
Voltage - Supply, Single/Dual (±)	-5V ~ 32V; ±2.5V ~ ±15V
Input Offset Voltage (Vos)	7.5mV
Voltage Gain	106.02dB
Max Input Current	250nA
Voltage - Input Offset (Max)	7.5mV @ ±15V
Output Current per Channel	200pA
Propagation Delay	200 ns
Response Time	200 ns
Neg Supply Voltage-Nom (Vsup)	-15V
Average Bias Current-Max (IIB)	0.3µA
Input Bias Current	250nA
Current - Input Bias (Max)	0.25µA @ ±15V
Dimensions	Height: 3.3mm, Width: 7.1mm, Length: 9.8mm
Radiation Hardening	No
Lead Free	Yes
REACH SVHC	No SVHC
RoHS Status	RoHS3 Compliant

Schematic Diagram of LM311N

Packaging for LM311N

Manufacturer of LM311N

STMicroelectronics, with its headquarters nestled in Geneva, Switzerland, has grown into a premier multinational electronics and semiconductor manufacturer. The company's journey began in 1987 through the merger of France's Thomson Semiconductors and Italy's SGS Microelettronica, marking its place in the industry. STMicroelectronics' legacy and continuous contributions shine a light on its role within the electronics and semiconductor.

Datasheet PDF

LM311N Datasheets:

LM111,211,311.pdf

Frequently Asked Questions [FAQ]

1. What is LM311N?

The LM311N is a voltage comparator with an integrated strobe function, widely utilized in electronic circuits to compare analog signals. It features fast response times and exceptional accuracy, making it useful in applications such as zero-crossing detectors and voltage monitoring systems. Incorporating the strobe function within practical designs can notably enhance performance by synchronizing the comparator’s operation with other components in the system.

2. What is the difference between LM311N and LM311P?

The primary difference between LM311N and LM311P lies in their packaging, influencing their manufacturing processes and marking conventions. Both are housed in dual in-line plastic packages. 'N' is used by U.S. national and various manufacturers. 'P' is favored by companies like Motorola in the U.S. These distinctions are good for ensuring that the correct parts are sourced during the design and production phases, thereby avoiding potential mismatches and ensuring smooth operation.

3. What do the numbers after LM311, such as LM311M, LM311N, LM311H, signify?

The suffixes (M, N, H) represent different packaging and application standards tailored to various uses, spanning from general civilian to specific military or industrial applications. 'M' may denote a miniaturized package suitable for space-constrained designs. 'N' stands for a standard plastic package, balancing cost and performance. 'H' indicates a hermetically sealed package for high-reliability environments like aerospace and defense.