LM311 Voltage Comparator

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LM311 is a single high-speed voltage comparator IC. The IC basically offers a low-cost high-performance solution to conventional design issues & also possesses direct interfacing capability with almost every PMOS, CMOS, and NMOS device. The IC also offers flexibility in terms of optimization preferences in high optimization areas, allowing it to be the first choice for most electronic design applications.

Voltage Comparator

A voltage comparator is a simple electronic circuit that has the capability to compare two applied voltages. The comparator then switches the output to either a high or low state depending upon which voltage is higher. Comparator circuits are widely used in applications, where physical measurements need to be compared, provided those physical variables can be translated into voltage signals. In a practical voltage comparator; the reference voltage is set using the voltage divider network comprising of R1 and R2.

Vref = (V+/ (R1 + R2)) x R2.

LM311 Pinout

LM311 Pin Configuration

Pin No	Pin Name	Description
1	GND	Ground Pin
2	NON-INV-INPUT	Non Inverting Input Of Comparator
3	INV-INPUT	Inverting Input Of Comparator
4	V-	Negative Supply Voltage
5	BALANCE	Balance Pin
6	BALANCE/STROBE	Strobe Pin
7	OUTPUT	Output Of Comparator
8	V+	Positive Supply Voltage

Order Codes

Part No:	Temp: Range
LM311	0˚C to +70˚C
LM111	−55˚C to 125˚C
LM211	−25˚C to 85˚C

LM311 Features

Operates from single 5V supply
Input current: 150 nA max. over temperature
Offset current: 20 nA max. over temperature
Differential input voltage range: ±30V
Power consumption: 135 mW at ±15V
Available in Q-Temp Automotive
- – High-Reliability Automotive Applications
- – Configuration Control and Print Support
- – Qualification to Automotive Standards