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LM431BCM3

Name: LM431BCM3
Rating: 4.7 (12 reviews)

IC VREF SHUNT ADJ 1% SOT23-3

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製造商。部分 #LM431BCM3
包 SOT23-3
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規格

Package	Tape & Reel (TR),Cut Tape (CT),Bulk
ProductStatus	Not For New Designs
ReferenceType	Shunt
OutputType	Adjustable
Voltage-Output(Min/Fixed)	2.495V
Voltage-Output(Max)	37 V
Current-Output	100 mA
Tolerance	±1%
TemperatureCoefficient	50ppm/°C Typical
Current-Cathode	1 mA
OperatingTemperature	0°C ~ 70°C (TA)
MountingType	Surface Mount
Package/Case	TO-236-3, SC-59, SOT-23-3

概述

Description

LM431BCM3 is a three-terminal programmable shunt regulator (precision reference) with a 2.495 V reference. It acts like an adjustable zener in a feedback loop, enabling simple, low-cost voltage regulation.
How it works:
- Cathode connects to the output node, anode to ground, and a resistor divider from output to reference pin.
- It holds the reference pin at about 2.495 V, so the output voltage is set by Vout ≈ Vref(1 + R1/R2) + Iref·R1.
- Requires a minimum cathode current to regulate; can sink up to its package limit (tens of milliamps, depending on the device).
Key specs (typical):
- VKA (Cathode–Anode voltage): up to ~36 V
- Vref: ~2.495 V
- Accuracy: ~0.5% (25°C)
- Low dynamic impedance
- Imin ≈ a few mA; Imax limited by package (SOT-23, BCM), typical tens of mA
Package: BCM variant in a 3-pin SOT-23 (M3) package, RoHS-compliant.
Typical uses: linear power-supply regulation, post-regulation, LED drivers, battery chargers, and precision voltage references.

Features

LM431BCM3 is an adjustable precision shunt regulator. Key features:
- 2.495 V reference
- External resistor divider sets output voltage (Vout ≈ 2.5 V to tens of volts, within device limits)
- Cathode current up to about 100 mA (regulation typically requires a minimum ~1 mA)
- Temperature range: -40°C to +125°C
- Vref accuracy typically around ±1% at 25°C (temp dependence specified in datasheet)
- Low dynamic impedance; good line and load regulation
- Internal error amplifier; no external op-amp needed
- Stable with a wide range of output capacitors and ESRs (per application notes)
- Protection: current limiting and thermal/shutdown protection
- 3-pin device, pin-compatible with TL431 family in many packages
Note: exact numbers (max current, voltage range, and accuracy) can vary slightly by package and lot; consult the specific datasheet for your BCM3 variant.

Package

LM431BCM3 comes in a SOT-23-3 (3-pin surface-mount) package.

Pinout

Three pins. It is a programmable shunt regulator (precision adjustable voltage reference). It uses a 2.495 V internal reference and regulates by sinking current from its Cathode to its Anode to keep the Reference pin at ~2.495 V. Terminals: Reference (R), Anode (A), Cathode (K).

Manufacturer

- Manufacturer: Texas Instruments (TI).
- What kind of company: TI is an American multinational semiconductor company that designs and manufactures analog, mixed-signal, and embedded processing ICs and related products.

Application

LM431BCM3 is a three-terminal programmable shunt regulator with a ~2.495 V reference. Common applications:
- Adjustable shunt regulator in linear and switching power supplies
- Programmable zener/reference in feedback loops
- Voltage reference for regulators and instrumentation (ADC/DAC)
- Error amplifier/reference in regulator control circuits
- Battery charging and protection circuits
- Overvoltage protection and precision reference in measurement systems

Equivalent

LM431BCM3 is a 2.495V adjustable shunt regulator. Common equivalents (drop-in replacements) include:
- TL431 (and TL431A/B/C)
- TLV431 / TLV431A
- AZ431 (Diodes Inc.)
- KA431
- NCP431 (ON Semiconductor)
- UA431 (Unisonic)
- NJM431 (New Japan Radio)
- LMV431 (and variants)
These are functionally equivalent devices across vendors, differing mainly in packaging and tolerance.