TL431LIBIDBZR

TL431LIBIDBZR is a TI TL431 programmable shunt regulator in a specific lead‑free, RoHS‑compliant package variant. It acts as a precision adjustable reference with an internal error amplifier and a controllable cathode current, used as the feedback element in power supplies and other regulators.
Key ideas:
- It provides a fixed reference (approx. 2.495 V) and sinks current to keep the feedback divider output at that value.
- External resistors set the regulation point, so it can regulate a wide range of output voltages in linear and switching regulators, LED drivers, battery chargers, etc.
- Typical operation: must have a minimum cathode current to regulate (about a few mA) and can sink up to roughly 100 mA; supply voltage up to ~36 V (varies by version).
- Useful as a simple, cost‑effective error amplifier and reference in compact feedback loops.
Package suffix note:
- LIBIDBZR identifies a specific TI packaging/lead‑free/RoHS variant. For exact mechanical, pinout, and package details, consult the TI datasheet for TL431LIBIDBZR.

Here are the typical features of TL431IDBZR (TL431 shunt regulator in the LIB/DBV package):
- Precision adjustable shunt regulator with 2.495 V reference
- External resistor network sets output voltage from about 2.5 V up to ~36 V
- Reference accuracy around 1% (25°C)
- Cathode current range: ~1 mA to 100 mA (regulated range; max ≈100 mA)
- Wide input range (VKA) up to about 36 V
- Low dynamic impedance and fast response; good line and load regulation
- Acts as a programmable zener/reference in feedback loops; no external op-amp needed in many apps
- RoHS-compliant, industrial temperature grade (typical -40°C to +125°C)
- Available in SOT-23 (DBV) and related packages for compact designs
Common applications: adjustable voltage reference, post-regulation in power supplies, SMPS feedback, and precision reference in low-power circuits.

TL431LIBIDBZR is in a SOT-23-3 (3-pin) package, RoHS lead-free version.

- Pin count: 3
- Function: Adjustable precision shunt regulator (programmable Zener). It has a 2.495 V reference and three terminals: Reference (Vref), Anode (A), and Cathode (K). It regulates voltage by shunting current between Cathode and Anode, controlled via the Vref input. Pinout depends on the package (e.g., SOT-23 vs TO-92).

Manufacturer: Texas Instruments (TI).
TI is an American multinational semiconductor company that designs and manufactures analog and mixed-signal integrated circuits and other semiconductor products for a wide range of industries (industrial, automotive, consumer electronics).

TL431LIBIDBZR is a programmable precision shunt regulator. Common applications include:
- Feedback reference for linear and switching regulators (set output with resistor divider)
- Adjustable zener/reference in voltage monitors and instrumentation
- Error amplifier element in SMPS control loops
- LED driver circuits (constant-current regulation and dimming control)
- Overvoltage protection/crowbar schemes
- Battery charger/regulator circuits and ADC voltage references

TL431LIBIDBZR is TI’s TL431 programmable shunt regulator (2.495 V reference). Equivalents include: TL431, TLV431 (TI); LMV431/LM431; KA431 (NXP); AZ431 (Diodes Inc); NCP431 (On Semiconductor). These are functionally interchangeable in typical shunt-regulator applications; verify pinout and packaging for your design.