LM431BCM3

LM431BCM3 is a three-pin programmable shunt regulator (a precision adjustable reference), similar to a TL431. It contains a 2.495 V internal reference and an error amplifier that sinks or stops sinking current to hold the REF input at about 2.495 V by adjusting the cathode current through an external resistor divider.
Key points:
- Reference: ~2.495 V (accuracy depends on grade)
- Range: operates up to about 30–36 V (collector/cathode voltage rating)
- Current: regulates with a minimum cathode current (I_K(min)) of ~1 mA and can sink up to tens of mA (I_K(max) ≈ 100 mA typical)
- Pinout: Anode (A), Cathode (K), Reference/Ref (R)
- Package: small 3-pin package (BCM3 variant designation)
Common uses:
- Precision reference and feedback in linear or switching regulators
- Adjustable voltage regulator in power supplies
- Voltage reference in battery chargers and sensors
For exact electrical specs, pinout, and packaging details, consult the LM431BCM3 datasheet from the manufacturer.

LM431BCM3 is a programmable precision shunt regulator (2.495 V). Common equivalents (same function; verify pinout/package):
- TL431 family (TL431, TL431A/TL431C)
- KA431 / KSA431
- AZ431 (AZ431A)
- NCP431 (ON Semiconductor)
- LMV431 / LMV431A (TI)
- NJM431 (New Japan Radio)
Note: cross-reference depends on package and pinout; always check the datasheet for exact specs (reference, knee current, power rating).

Here are the typical features of the LM431BCM3 (programmable shunt regulator):
- Precision 2.495 V reference (Vref) for accurate regulation
- Programmable output via external resistor divider: Vout = Vref(1 + R2/R1) + IADJ·R2
- Wide operating range as a shunt regulator (cathode current ~1 mA to up to ≈100 mA; max VKA ≈ 30–36 V)
- Low dynamic impedance for tight regulation
- Comprehensive protection: overcurrent and thermal shutdown
- Good line and load regulation characteristics
- Can be used as an adjustable precision zener or in various voltage-regulation topologies
- Available in small surface-mount packages suitable for compact designs
Note: Exact values (tolerances, temp coefficient, and max ratings) vary by specific lot/packaging; refer to the datasheet for the LM431BCM3 for precise parameters.

3 pins. It is a programmable precision shunt regulator (shunt reference), similar to a TL431. It maintains a fixed reference (about 2.495 V) between REF and ANODE by regulating current from CATHODE to ANODE. Pins: REF, ANODE, CATHODE.

- Manufacturer: Texas Instruments (TI).
- What kind of company: American multinational technology company and one of the world’s largest semiconductor manufacturers, specializing in analog, mixed-signal, and embedded processing devices.

LM431BCM3 is an adjustable precision shunt regulator (programmable zener) with a 2.495 V reference. Common applications:
- Feedback reference in linear and switching power supplies (voltage regulation).
- Precision voltage reference for ADC/DAC, instrumentation, and measurement circuits.
- Post-regulation and error-amplifier element in buck/boost converters.
- Battery charger regulation and protection networks.
- LED driver/regulation using feedback from the regulator.
- Overvoltage protection or crowbar circuits.
- General adjustable reference in instrumentation and analog circuits.

It uses a SOT-23-3 surface-mount package (3-pin).