TL1431CDR

TL1431CDR is Texas Instruments’ three‑terminal precision programmable shunt regulator (a TL431‑type voltage reference). It provides a stable reference voltage (about 2.495 V) and, with an external resistor divider, sets a regulated output by sinking current between the cathode and anode through the reference pin. In circuits it acts like a programmable Zener in the feedback loop of power supplies or simple regulators.
Key points:
- Reference ~2.495 V; output set by external resistors
- Sinks current to regulate the output; suitable for use as a reference in linear or switching regulators
- Low dynamic impedance and good line/load regulation
- Needs a minimum cathode current for proper regulation; can handle tens of mA depending on variant
- Typical packaging suffix (CDR) relates to TI’s shipping/packaging options
Common applications: voltage references, simple shunt regulators, regulator feedback references, battery chargers. Check the datasheet for exact specs, pinout, and packaging.

TL1431CDR is TI’s 2.495 V adjustable shunt regulator (TL431 family). Drop-in equivalents from other vendors include:
- TL431 (TI)
- TLV431 (TI, lower voltage version)
- AZ431 (Diodes Inc)
- NCP431 (ON Semiconductor)
Note: All are 3-pin (Anode, Cathode, Reference); verify current limits and reference voltage tolerance in the datasheet for your design.

TL1431CDR is an adjustable precision shunt regulator (TL1431 family) similar to TL431. Key features:
- 2.495 V reference (typical) for accurate regulation
- Output set by external resistor divider (external network provides the adjustable threshold)
- Cathode current range: about 1 mA to 100 mA (operating range for regulation)
- Maximum cathode-to-anode voltage: up to 36 V
- Low dynamic impedance for tight regulation and fast response
- Good temperature stability and low drift (suitable for precision references)
- Widely used as adjustable shunt regulator, precision reference, or feedback element in power-supply designs
Note: Exact values (tolerances, tempco, and ZK) depend on package/process; consult the datasheet for your package variant for precise figures.

- Pin count: 3 pins
- Function: Programmable precision shunt regulator (adjustable reference), used as a voltage reference in feedback loops to regulate output by shunting current. Typically wired with the cathode to the output, the anode to ground, and the reference pin fed by a resistor divider.

- Manufacturer: Texas Instruments Incorporated (TI).
- What kind of company: An American multinational semiconductor company that designs and manufactures analog and mixed-signal integrated circuits (and related technologies); one of the world’s largest semiconductor manufacturers.

TL1431CDR is a programmable precision shunt regulator (similar to TL431).
Applications:
- Reference and regulation in linear power supplies
- Feedback reference in adjustable switching regulators
- Precision voltage reference for ADC/DAC circuits
- Instrumentation and sensor reference circuitry
- Overvoltage protection and crowbar/clamp circuits
- LED current regulation with a series pass element
- Battery-powered regulation requiring a stable reference

TL1431CDR comes in a 3-pin SOT-23 (SC-70) package, RoHS-compliant.