TL431AIZT

TL431AIZT is Texas Instruments’ adjustable precision shunt regulator (a programmable reference plus error amplifier). It behaves like a controllable zener and is used in feedback loops to regulate voltage.
- Key idea: a 2.495 V reference that sets the output via an external resistor divider. Vout ≈ Vref × (1 + R1/R2) with some drift.
- Current: it can sink a regulated cathode current (typical regulation range around a few mA up to ~100 mA, depending on package/version).
- Variants like AIZT indicate RoHS/lead-free packaging; exact package options and electrical limits vary, so consult the specific TL431AIZT datasheet for details.
- Common uses: linear or switching power supplies, LED drivers, battery chargers, and any precision reference in a feedback loop.
- Important notes: ensure your resistor network keeps the device in its regulation region and respect the min/max current and temperature specs from the datasheet.
If you need exact specs and packaging for TL431AIZT, please reference TI’s datasheet for that specific variant.

TL431AIZT features (summary):
- Precision programmable shunt regulator with a 2.495 V reference
- External resistor divider sets the output voltage (Vout ≈ Vref(1 + R2/R1) + Iadj·R2)
- Three-terminal device used as an adjustable zener in feedback networks
- Wide operating range: supply from about 2.5 V to 36 V; can sink significant current
- High accuracy with good line and load regulation; low dynamic impedance
- Temperature-stable reference with relatively low drift
- Internal current limiting and short-circuit protection
- Suitable for simple, cost‑effective regulation in power supplies and reference circuits
- Available in compact, RoHS‑compliant packages (e.g., SOT‑23, TO‑92 family variants) for easy PCB integration
Note: Vout is determined by the external resistor network; the device operates as a shunt regulator to regulate the voltage at its cathode.

TL431AIZT is in a SOT-23-3 3-pin surface-mount package (RoHS); available in Tape & Reel.

- Pin count: 3 pins (Cathode, Anode, Reference)
- Function: Programmable precision shunt regulator (adjustable Zener). Uses the Ref input (≈2.495 V) to regulate the cathode voltage by sinking current, commonly used in feedback loops for power-supply regulation.

- Manufacturer: Texas Instruments (TI).
- What kind of company: TI is a US-based multinational semiconductor company that designs and manufactures analog, mixed-signal, and embedded-processing integrated circuits used in a wide range of electronics worldwide.

- Programmable precision shunt regulator/reference
- Feedback reference for SMPS/DC-DC converters
- Post-regulation/adjustable regulator in linear supplies
- Precision voltage reference for ADC/DAC and instrumentation
- Overvoltage crowbar protection in power supplies
- LED driver and battery charger feedback networks
- General adjustable zener replacement with external resistor network

TL431AIZT is a programmable shunt regulator (2.495 V reference). Common equivalents:
- LM431 (National/TI)
- KA431
- TS431 (ST)
- AZ431 (Diodes Inc)
- NCP431 (Onsemi)
- MCP431 (Microchip)
- REF431 (Analog Devices)
- AD431 (Analog Devices)
- TLV431 / TLVH431 (TI, low-voltage variants)
Note: check exact pinout and package compatibility before substituting.