LM393 Datasheet PDF – Voltage Dual Comparator – National

This is Voltage Dual Comparator.

Part Number: LM393

Function: Low Power Low Offset Voltage Dual Comparator

Package: SOIC 8 Pin Type

Manufacturer: National ->Texas Instruments

National Semiconductor was acquired by Texas Instruments (TI) on September 23, 2011.


LM393 datasheet


What is LM393?

The LM393 series consists of two independent precision voltage comparators with an offset voltage specification as low as 2.0 mV max for two comparators which were designed specifically to operate from a single power supply over a wide range of voltages.

Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage. These comparators also have a unique characteris tic in that the input common-mode voltage range includes ground, even though operated from a single power supply voltage.

A comparator is an electronic circuit that compares two voltage inputs and outputs a digital signal indicating which input voltage is higher or lower. The output of a comparator is typically a logic signal, such as a high or low signal, that can be used to control other electronic devices, such as switches or LEDs.


1. Low input biasing current : 25 nA

2. Low input offset current : ±5 nA

3. Maximum offset voltage : ±3 mV

4. Input common-mode voltage range includes ground

5. Differential input voltage range equal to the power supply voltage

6. Low output saturation voltage : 250 mV at 4 mA



1. Low power consumption: The device operates at a low power supply voltage and has a low quiescent current, making it ideal for use in low-power applications.

2. Wide operating voltage range: The IC can operate at a wide range of supply voltages, from 2V to 36V, making it suitable for a variety of applications.

3. Low input offset voltage: The LM393 has a low input offset voltage, which ensures accurate comparisons between the input voltages.

4. Versatile: The Comparator is a versatile IC that can be used in a wide range of applications, including voltage level detection, window comparators, and other control circuits.


1. Limited output drive capability: The output of the IC is an open collector, which limits its output drive capability. An external pull-up resistor is required to drive the output to a high level.

2. Limited bandwidth: The device has a limited bandwidth, making it unsuitable for high-frequency applications.

3. Slow response time: The response time of the LM393 is relatively slow, which can limit its use in some applications that require fast response time


1. What is the difference between LM393 and LM339?

Both ICs are voltage comparators, but the LM339 has four comparators while the LM393 has two. The LM339 also has a higher output current drive capability and a wider operating temperature range.

2. How do I use an LM393 comparator?

The LM393 can be used to compare two voltages and output a logic level signal indicating the relationship between the inputs. An external resistor is typically used to set the reference voltage for the comparator. The output can be used to drive a variety of loads, such as LEDs, relays, or other digital logic circuits.

3. Can the LM393 be used for analog signal processing?

No, the LM393 is a digital comparator and is not suitable for analog signal processing.

LM393 Datasheet PDF Download

LM393 pdf

Other data sheets are available within the file:

LM193, LM193AH, LM193AH-MLS, LM193AH-QMLV, LM193AH/883

Related articles across the web