TL431LIBQDBZRQ1

TL431LIBQDBZRQ1 is a lead-free, 3-pin programmable shunt regulator in the TL431 family. It acts like an adjustable precision reference that can regulate the voltage across a load by shunting current.
Key points:
- Vref: ~2.495 V (typical).
- It behaves like an adjustable Zener; set the regulated voltage with external resistors (cathode → ref → anode network). The regulated cathode-to-anode voltage is ≈ Vref × (1 + R1/R2) + Iref × R1.
- Operating current: regulates from about 1 mA up to ~100 mA (typical limits vary by device).
- Features: low dynamic impedance, good line/load regulation, temperature behavior characteristic of TL431 devices.
Pinout (3 pins): Cathode, Anode, Reference. Used as post-regulation in switching supplies, precision references, and LED current regulators.
Applications: precision reference/zener replacement, shunt regulator in power supplies, feedback element in linear or switching regulators, LED driving circuits.
Note: “LIBQDBZRQ1” denotes a specific RoHS/packaging variant of the TL431 family.

TL431LIBQDBZRQ1 is a programmable precision shunt regulator (TL431 family). Common equivalents cross‑refs:
- TL431
- TLV431
- LMV431 / LMV431A
- NCP431 / NCP431A
- KA431
- REF431 / REF431A
- AZ431
Note: exact packaging/pinout varies by vendor. Check datasheets for packaging and pin compatibility.

TL431LIBQDBZRQ1 is a programmable precision shunt regulator. Key features:
- Internal 2.495 V reference with external resistor network to set output
- Acts as an adjustable shunt regulator / error amplifier (no external op-amp needed)
- Cathode current range: regulation typically from about 1 mA up to ~100 mA
- Excellent line and load regulation with low dynamic impedance
- Temperature stability varies by grade (high-accuracy variants offer tighter initial accuracy and better TC)
- Includes built-in protection (current limit and safe operating area)
- Available in RoHS-compliant, lead-free packages (LIB variants) such as SOT-23, SOT-89, TO-92, etc
- Common applications: power-supply feedback references, adjustable voltage references, precision regulation, LED driver circuitry
Note: exact accuracy grades and TC depend on the specific variant.

- Pin count: 3 pins (Anode, Cathode, Reference)
- Function: Programmable precision shunt regulator (adjustable voltage reference). It maintains ~2.495 V at the reference input and conducts current between cathode and anode to regulate voltage in feedback circuits.

- Manufacturer: Texas Instruments (TI).
- What kind of company: An American multinational corporation that designs and manufactures semiconductors, specializing in analog and embedded processing ICs. HQ in Dallas, Texas.

TL431LIBQDBZRQ1 is a programmable shunt regulator with a 2.495 V reference. Common applications:
- Feedback reference in switch-mode power supplies (SMPS) to regulate the output
- Adjustable precision Zener substitute for linear regulators and post-regulation
- LED driver circuits (constant current and dimming control)
- Battery charging and protection circuits (voltage/current regulation)
- Voltage references for instrumentation, DAC/ADC front ends, and op-amp circuits
- Simple adjustable regulators and programmable references in compact power supplies
Note: proper regulation requires a minimum cathode current (typically a few mA).

SOT-23-3 (3-pin) surface-mount package.