on November 14th 80

Comprehensive Guide to the LM311D Comparator

This article digs into the LM311 voltage comparator, a high-speed, low-power component optimized for precise voltage detection and fast response. It is ideal for applications like signal conditioning and analog-to-digital conversions. Its low input current and broad voltage range adaptability make it versatile for use in communication systems, sensor applications, and automatic control circuits. The LM311’s robust performance across diverse conditions emphasizes its industrial resilience, and we’ll cover its key features, including CAD models, compatibility with various logic systems, and practical insights to help you maximize its integration for enhanced system performance.

Catalog

CAD Model

Symbol

Footprint

3D Structural Model

Overview of the LM311D

TheLM311D's adaptability shines through its ability to support a wide variety of power supplies. Its design ensures efficient operation with dual polarity supplies typically used for operational amplifiers, like ±15 V, and it adapts seamlessly to 5 V logic systems as well. This flexibility enhances its role in numerous electronic applications, enabling you to craft circuits that harmonize both analog and digital elements. The subtle advantage lies in leveraging this compatibility to streamline complex design processes.

The LM311D stands out with its broad compatibility covering most TTL and MOS logic circuits. This characteristic positions it as a dynamic component in both established and modern electronic environments. The ease of integrating this comparator into mixed-signal frameworks, where multiple logic families coexist, is appreciated for reducing circuit interfacing complexity and accelerating the development timeline.

Possessing the capability to directly drive lamps and relays, the LM311D can handle up to 50 V at a current of 50 mA. This attribute is remarkable for applications where the comparator directly controls peripheral devices, enabling automatic control systems. The LM311D's effectiveness in performing these tasks resonates in industrial contexts, where its reliability under various conditions is often tested. Mostly noteworthy is the input and output isolation feature, which affords you greater latitude in system architecture. By ensuring the comparator can drive ground-referenced loads without interference, you can achieve more consistent and reliable operation, demonstrating an insightful grasp of potential signal interference hurdles in sophisticated systems.

Characteristics of the LM311D

Feature	Specification
Maximum Input Current	150 nA
Maximum Offset Current	20 nA
Differential Input Voltage Range	±30 V
Power Consumption	135 mW at ±15 V
Supply Voltage	+5 V to ±15 V
Output Current	50 mA

Specifications

Type	Parameter
Lifecycle Status	ACTIVE (Last Updated: 7 months ago)
Factory Lead Time	25 Weeks
Mount	Surface Mount
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154, 3.90mm Width)
Number of Pins	8
Weight	4.535924g
Number of Elements	1
Operating Temperature	0°C ~ 70°C
Packaging	Tube
JESD-609 Code	e4
Part Status	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	8
ECCN Code	EAR99
Type	General Purpose
Terminal Finish	Nickel/Palladium/Gold (Ni/Pd/Au)
Max Power Dissipation	710mW
Terminal Position	DUAL
Terminal Form	GULL WING
Number of Functions	1
Supply Voltage	15V
Base Part Number	LM311
Pin Count	8
Output Type	DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL
Operating Supply Voltage	15V
Number of Circuits	1
Nominal Supply Current	7.5mA
Power Dissipation	710mW
Output Current	50mA
Max Supply Current	6mA
Propagation Delay	200 ns
Quiescent Current	7.5mA
Turn On Delay Time	200 ns
Response Time	200 ns
Voltage - Supply, Single/Dual (±)	5V ~ 30V ±2.5V ~ 15V
Output Current per Channel	200pA
Input Offset Voltage (Vos)	7.5mV
Neg Supply Voltage - Nom (Vsup)	-15V
Voltage Gain	106.02dB
Average Bias Current - Max (IIB)	0.3μA
Max Input Current	250nA
Dual Supply Voltage	9V
Input Bias Current	250nA
Voltage - Input Offset (Max)	7.5mV @ ±15V
Current - Input Bias (Max)	0.25μA @ ±15V
Height	1.25mm
Length	5mm
Width	4mm
REACH SVHC	No SVHC
Radiation Hardening	No
RoHS Status	ROHS3 Compliant
Lead Free	Lead Free

Functional Block Diagram

Schematic Diagram

Typical Apllication Schematic

Package

Manufacturer of LM311D

STMicroelectronics stands out in semiconductor technology, leveraging profound proficiency in microelectronics to stimulate progress. With a vast manufacturing capability and an extensive IP portfolio, STMicroelectronics sustains its position in the industry. By showcasing expertise in System-on-Chip (SoC) technology, they skillfully integrate varying technology domains, embodying the essence of modern technological convergence.

As a dynamic influence in microelectronics, STMicroelectronics spearheads innovations through advanced techniques. These techniques not only uplift existing technologies but also pave the way for groundbreaking advancements in communication, efficiency, and scalability. System-on-chip technology plays a major role in their suite of solutions, offering the integration of multiple functions within a singular chip. Such integration refines product design, economizes costs, and boosts performance efficiency.

Datasheet PDF

LM311D Datasheets:

LM111,211,311.pdf