LM431BCM3 Integrated Circuits (ICs)

Noise - 0.1Hz to 10Hz:	--
Base Part Number:	LM431
Supplier Device Package:	SOT-23-3
Package / Case:	TO-236-3, SC-59, SOT-23-3
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Current - Cathode:	1mA
Current - Supply:	--
Voltage - Input:	--
Noise - 10Hz to 10kHz:	--
Series:	--
Temperature Coefficient:	50ppm/°C Typical
Tolerance:	±1%
Current - Output:	100mA
Voltage - Output (Max):	37V
Voltage - Output (Min/Fixed):	2.495V
Output Type:	Adjustable
Reference Type:	Shunt
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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Introduction

The LM431BCM3, part of the National Semiconductor series of Voltage Reference ICs, is a low power, precision, two-terminal adjustable voltage reference. This device is used in voltage regulation and precision supply applications, and is suitable for a wide range of applications in the automotive industry. It can be used to monitor and control voltage in a variety of systems. It is capable of providing a stable output current up to 10 mA and can operate at ambient temperatures between -55 to +125 degrees Celsius.
Overview

The LM431BCM3 can accept a variety of input voltages, ranging from 0V to 60V. It is designed with an internal voltage regulator which enables the device to operate at a steady voltage range of 2.5 - 6.5V, regardless of the input voltage. The device can output up to 10mA of current and provides excellent line and load regulation per datasheet specifications. In addition to its precision voltage regulation capabilities, the LM431BCM3 also features an adjustable output voltage for more accurate regulation. It is available in an 8-pin PDIP or SOIC package and has an operating temperature range from -55C to +125C.
Application Field

The LM431BCM3 can be used in a wide range of automotive electronics applications. It can be used for voltage regulation and monitoring of gasoline engines, airbags, brakes, and air conditioning systems. It can also be used as a control IC in electrical and hybrid vehicles. Additionally, it is suitable for a variety of other applications that require precise voltage control and monitoring including medical, industrial and consumer electronics.
Working Principle

The LM431BCM3 uses a series of transistors to create a voltage regulation loop. The input voltage is applied to the device, and the transistors act as switches which alternately turn on and off in order to regulate the output voltage. The output voltage is determined by the voltage divider formed by resistors connected to the device. The device can be adjusted to create a more accurate output voltage by adjusting the resistors. It can also be adjusted to adapt to varying input voltages by adjusting a control pin on the IC.
Conclusion

The LM431BCM3 is a low power, precision voltage reference IC ideal for automotive and other applications requiring precise voltage regulation and monitoring. It has an adjustable output voltage, allowing for more accurate regulation, and can operate from 0V to 60V input. It has excellent line and load regulation per datasheet specifications and is available in 8-pin PDIP or SOIC packages. It is capable of providing a stable output current up to 10 mA and can operate at ambient temperatures between -55 to +125 degrees Celsius.

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