TL431LIBQDBZRQ1

TL431LIBQDBZRQ1 is TI’s TL431 adjustable precision shunt regulator (a programmable zener) in a specific lead-free RoHS package variant (LIBQDBZRQ1).
- What it is: a three-terminal device that maintains its reference pin at about 2.495 V and adjusts its cathode current to regulate the output.
- How it works: an internal error amplifier compares the Ref pin to the 2.495 V reference. With a resistor divider from Vout to Ref, you set the desired output voltage; the device then shunts current to keep the Ref at 2.495 V.
- Key features: Vref ≈ 2.495 V; adjustable output (roughly 2.5 V to up to ~36 V across the part’s voltage rating); can source/sink modest current in the feedback loop; useful in high-precision regulation.
- Applications: feedback/regulation for DC-DC converters, linear regulators, battery chargers, overvoltage protection, and precision references.
- Pinout (typical): Reference, Anode, Cathode (verify per package).
Note: “LIBQDBZRQ1” specifies the exact TI packaging/variant; consult the datasheet for pinout and electrical specifics for this exact package.

TL431LIBQDBZRQ1 is the TL431 family programmable shunt regulator. Key features:
- 3‑terminal adjustable shunt regulator (A, K, R) with a 2.495 V reference
- Output voltage set by external resistor divider (Vout ≈ Vref(1 + R2/R1))
- Wide operating range: up to about 36 V across A–K
- Cathode current regulating range: ~1 mA to 100 mA (regulates with I_K(min) ≈ 1 mA)
- Low dynamic impedance and good line/load regulation
- Temperature/stability: Vref ~2.495 V with favorable TC; suitable for stable feedback loops
- Available in multiple package options (e.g., SOT‑23, TO‑92, etc.)
- Commonly used as a programmable zener, error amplifier in voltage regulators, and precision references
Notes: exact tolerance/grades (1%/0.5%, etc.) depend on the specific device variant.

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

- Pin count: 3 pins (three-terminal device).
- Pinout (typical): Pin 1 = Reference (REF), Pin 2 = Anode (A), Pin 3 = Cathode (K).
- Function: Programmable precision shunt regulator (adjustable zener). Maintains about 2.495 V between REF and A and conducts from cathode to anode to regulate an output in feedback networks. Used as a voltage reference in power supplies and other regulation circuits.

- Manufacturer: Texas Instruments (TI)
- What kind of company: TI is an American multinational semiconductor company that designs and manufactures analog and mixed-signal integrated circuits and other electronic components.

TL431LIBQDBZRQ1 is a programmable shunt regulator/voltage reference. Typical applications:
- Adjustable shunt regulator and precision reference in analog circuits
- Error amplifier/reference in switching power supplies (SMPS) feedback with optocouplers
- Linear/post-regulation reference in DC regulators
- Constant-current LED drivers and backlight drivers
- Battery chargers and general DC–DC converter regulation
- Instrumentation/reference designs requiring a stable, programmable voltage

TL431LIBQDBZRQ1 is a 2.495V programmable shunt regulator (TL431 family). Equivalents include:
- TL431 (TI) and TLV431
- LMV431 / LM431 (ON Semi/National)
- NCP431 (ON Semi)
- REF431 (Analog Devices)
- AZ431 / KA431 (clone vendors such as Diodes Inc., Rohm)
All are 3-pin shunt regulators with similar pinouts (anode, cathode, reference). Check exact Vref accuracy and tempco per vendor.