TL431AIZT

TL431AIZT is a member of the TL431 family: a programmable precision shunt regulator (adjustable zener) used as a simple error amplifier/reference in power-supply feedback loops. It has a 2.495 V internal reference and sinks current from the cathode to the anode to keep the REF pin at Vref. With an external resistor divider from the output to REF, you set the desired output voltage; the device then adjusts its cathode current to maintain ~2.495 V at REF.
Key specs (typical): cathode-to-anode voltage up to about 36 V; minimum cathode current to regulate ~1 mA (varies by variant); maximum cathode current ~100 mA. Pins: cathode, anode, reference. The “AIZT” suffix indicates TI’s packaging code for a small lead-free surface-mount package (often SOT-23-3).
Applications: SMPS feedback and regulation, linear regulators, voltage references, crowbar/overvoltage protection, LED drivers, and battery chargers. Vout ≈ Vref(1 + R1/R2) + Iref·R1 (approximate). Variants (A/B/C) offer different accuracy/dynamic impedance.

TL431AIZT is a 2.495 V programmable shunt regulator. Equivalents (431-family) include: LM431 (National/Onsemi), KA431/KA431A, REF431 (Analog Devices), NCP431 (Onsemi), MCP431 (Microchip), TLV431/LMV431 (TI). There are also AZ431 clones. When substituting, verify pinout and specs (cathode current, dynamic impedance, temperature coefficient).

TL431AIZT is an adjustable precision shunt regulator (programmable zener) with a 2.495 V reference. Key features:
- 2.495 V reference with tight accuracy (grade-dependent, roughly 0.5–1%).
- Output set by a resistor divider: Vout ≈ Vref(1 + R2/R1) + Iref·R2.
- Wide operating voltage: VKA up to 36 V; can regulate with supply from ~2.5 V to 36 V.
- Cathode current for regulation: typical min ~1 mA, max ~100 mA (depends on package).
- Low dynamic impedance and good line/load regulation; fast transient response.
- Simple two-resistor feedback; suitable as error amplifier in SMPS or as adjustable zener in linear regulators.
- Package: AIZT (SOT-23, 3 pins) with Tape & Reel option.
Common uses: power-supply feedback, post-regulators, voltage reference for adjustable regulation.

- Pin count: 3 pins
- Function: adjustable precision shunt regulator (programmable Zener). Pins are REF, ANODE, CATHODE. It maintains about 2.495 V between REF and ANODE and regulates by sinking current from the CATHODE to keep the reference voltage set by an external resistor divider.

- Manufacturer: Texas Instruments (TI).
- What kind of company: An American multinational semiconductor company that designs and manufactures analog and mixed-signal ICs (and embedded processors); one of the world’s largest producers of analog semiconductor devices, headquartered in Dallas, Texas.

TL431AIZT is a programmable shunt regulator (adjustable precision reference). Common applications:
- SMPS feedback: acts as the error amplifier to set output via a resistor divider.
- Stand-alone voltage reference for linear regulators or ADC/DAC references.
- Post-regulation to improve line/load regulation.
- LED constant-current drivers (as a controllable current sink).
- Battery chargers and general power-management circuits.
- Protection: overvoltage sensing/crowbar and other voltage sensing circuits.
Notes: Vref ≈ 2.495 V; output threshold set by external divider; suitable for high-accuracy regulation in compact packages.

TL431AIZT comes in a 3-pin surface-mount package: SOT-23-3 (SOT-23).