TLVH431QDBZR

TLVH431QDBZR is TI’s TLVH431 family: an adjustable, precision shunt regulator (programmable zener). It uses an external resistor divider to set Vout and sinks current to keep the output at that level, acting as a reference or feedback element in regulators.
Key points:
- Reference: about 2.495 V (REF pin)
- Regulation: Vout set by R1/R2; cathode can regulate up to ~36 V
- Performance: low dynamic impedance, good accuracy over temperature; can sink tens of mA
- Package: typically SOT-23/3-type (QDBZR suffix indicates packaging/grade)
Applications:
- DC-DC regulator feedback, post-regulation, and voltage references
- Battery chargers and low-to-mid power supplies
Basic connection:
- A to ground, K to Vout, REF to the divider between Vout and ground
- Vout ≈ Vref × (1 + R1/R2) (Iref term is small and often neglected)
For exact electrical specs, pinout, and packaging, see the TI TLVH431QDBZR datasheet.

Equivalent parts (2.495V adjustable shunt regulators) commonly used:
- TL431 (TI)
- AZ431 / AZ431A (Diodes Inc)
- REF431 (Analog Devices)
- NCP431 (ON Semiconductor)
- TLV431 (TI)
- TLVH431 (automotive/variants, TI)
Note: check pinout, package (QDBZR) and temperature/voltage ratings when substituting.

TLVH431QDBZR features (concise):
- 2.495 V precision shunt reference (adjustable via external resistor network)
- External resistor network sets output threshold (programmable)
- Operating current range: approx. 1 mA to up to 100 mA (shunt regulator)
- Low dynamic impedance with good line/load regulation
- Automotive-grade (AEC-Q100 qualified) with wide temp range
- Pb-free and RoHS-compliant (DBZR); available in small surface-mount packages
- Stable with a variety of output capacitors for fast, stable regulation
Note: For exact electrical specs (tolerances, tempco, recommended capacitor values, package options), consult the datasheet.

- Pin count: 3 pins (SOT‑23-3 package).
- Function: Adjustable precision shunt regulator (TL431 family). Acts as a programmable zener with a reference of ~2.495 V. Pin 1 = Reference (Vref), Pin 2 = Anode (A, to ground), Pin 3 = Cathode (K, output). Used with external resistors to set the regulated voltage.

- Manufacturer: Texas Instruments (TI)
- About the company: TI is an American multinational semiconductor company that designs and manufactures analog and embedded processing ICs (including voltage references like the TLV/TLV431 family), as well as microcontrollers, power management ICs, and more. It is one of the world’s largest producers of semiconductors with global operations.

TLVH431QDBZR is a programmable shunt regulator (≈2.495 V reference). Common applications:
- Precision adjustable shunt regulator for low-power voltage regulation in power supplies
- Stable reference for ADCs/DACs, op-amps, and sensor circuits
- Reference/error amplifier element in feedback loops for linear and switching regulators
- Constant-current LED driver and general current-source applications
- Battery-powered and portable electronics needing a robust, low-noise reference
- Automotive/industrial control circuits (QDBZR variant) for reliable regulation and monitoring
Note: operates over a wide supply range and acts as a flexible, low-cost reference/regulator solution.

TLVH431QDBZR comes in a 3-pin SOT-23 (SOT-23-3) surface-mount package; RoHS lead-free (ZR) with tape-and-reel packaging.