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LM431BIM3/NOPB

Adjustable precision shunt regulator, 2.495V ref, 0.5% accuracy, 1-100mA, SOT-23

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Manufacturer Part：

LM431BIM3/NOPB

Package：

SOT-23-3 (2.9 x 1.3 x 1.0 mm)

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Description

Product Overview

The LM431BIM3/NOPB from Texas Instruments is an adjustable precision shunt regulator with 0.5% initial accuracy and a reference voltage of 2.495 V. Operating over a cathode current range of 1 mA to 100 mA, it is housed in a 3-pin SOT-23 package and is widely used for voltage regulation, monitoring, and feedback control in power supplies.

Key Specifications

Reference Voltage 2.495 V (adjustable)
Initial Accuracy +-0.5%
Cathode Current Range 1 mA to 100 mA
Cathode Voltage Range VREF to 36 V
Temperature Stability 50 ppm/degC (typ)
Operating Temperature -40 to 85 degC
Package SOT-23-3 (2.9 x 1.3 mm)

Features

  • Precision 0.5% initial accuracy (B grade)
  • Adjustable output voltage via external resistor divider
  • Low dynamic output impedance: 0.2 ohm typical
  • 1 mA to 100 mA cathode current operation
  • Low output noise
  • Fast turn-on response

Applications

  • Switching power supply feedback loop
  • Voltage monitoring and threshold detection
  • Adjustable zener replacement
  • Linear regulator reference
  • OVP crowbar circuits

The LM431BIM3/NOPB from Texas Instruments is a 3-terminal adjustable precision shunt regulator with B-grade 0.5% initial accuracy. The reference voltage of 2.495 V can be adjusted to any desired value between VREF and 36 V using two external resistors. The device operates over a cathode current range of 1 mA to 100 mA with a typical dynamic output impedance of 0.2 ohm. It is a direct replacement for the industry-standard TL431 in applications requiring higher precision, and is widely used in switching power supply feedback loops, voltage monitors, and precision reference circuits.

The LM431BIM3/NOPB operates as a precision shunt regulator by comparing the voltage at the REF pin to an internal bandgap reference of approximately 2.495 V. When the REF pin voltage exceeds the internal reference, the cathode current increases, which can be used to pull down the voltage at the cathode node. In a typical feedback loop, the output voltage is divided by a resistor network and applied to the REF pin. The LM431B adjusts its cathode current to maintain the REF pin at the reference voltage, thereby regulating the output. The low dynamic output impedance of 0.2 ohm ensures tight regulation under varying load conditions.

Pin Name Type Function
1 REF Input Reference input (2.495 V threshold)
2 ANODE Power Anode (ground connection)
3 CATHODE Power Cathode (supply connection)
  • Switching power supply optocoupler feedback loops
  • Precision voltage monitoring and threshold detection
  • Adjustable zener diode replacement
  • Linear voltage regulator reference element
  • Over-voltage protection crowbar circuits
Manufacturer Part Number Package Notes
TI TL431BIDBZR SOT-23-3 0.5% grade, industry standard
TI LM431AIM3/NOPB SOT-23-3 1% grade, lower cost
onsemi NCP431BVSNT1G SOT-23-3 0.5% precision shunt
Diodes Inc TL431BIA SOT-23-3 0.5% equivalent
Nexperia TL431BCDBZR SOT-23-3 0.5% grade, pin-compatible
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Contact Information

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Tel / WhatsApp: +86 13760382860

Service & Packaging

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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