TL431AIDR2G

TL431AIDR2G is TI’s TL431 family programmable shunt regulator in a specific AIDR2G package. Like other TL431 parts, it contains a 2.495 V reference and an internal error amplifier. By using an external resistor divider between the output and the reference pin, you set an adjustable voltage at the cathode; the device then sinks current to keep the cathode voltage equal to the divided reference. In short: it acts as an adjustable, precision “zener” used for feedback in power supplies and other regulators.
Key points:
- Reference: ~2.495 V, adjustable via external resistors
- Operation: three-pin device; it sinks cathode current to regulate
- Typical use: feedback/reference in buck/linear regulators, LED drivers, battery chargers
- Specs availability: minimum cathode current to regulate, maximum sink current, tolerance, and thermal data depend on the exact part variant; consult the TL431AIDR2G datasheet for precise figures and the package footprint.
If you need exact electrical specs or pinout, check TI’s datasheet for TL431AIDR2G.

Here are the key features of TL431AIDR2G (precision programmable shunt regulator):
- 2.495 V reference (programmable via external resistors)
- Three-terminal device (cathode, anode, reference) for easy regulator use
- Output voltage set with external resistor divider: Vout = Vref(1 + R1/R2) + Iadj·R1
- Wide adjustable output up to about 36 V; max cathode–anode voltage ~35 V
- Regulation current: knee current ~1 mA (min for regulation); max cathode current ~100 mA
- Low dynamic impedance and good line/load regulation
- Initial accuracy typically around 0.5% (max ~1%)
- Small Iadj current error (low bias on the divider)
- Temperature range generally -40°C to 125°C (industrial/automotive grade variants)
- RoHS compliant; available in small packaging (e.g., SOT-23 3-pin) with standard tape-and-reel
- No external op-amp required; suitable for references, voltage regulation, and feedback in power supplies
Note: exact accuracy, max current, and temperature range can vary by grade/package; refer to the specific datasheet revision for final numbers.

TL431AIDR2G comes in a SOT-23-3 package (3-pin).

- Pin count: 3 pins (SOT-23 3-pin package).
- Function: Adjustable precision shunt regulator (programmable voltage reference). Maintains a stable Vref (≈2.495 V) and shunts current between cathode and anode to regulate output via an external feedback network. Pin names: Reference, Anode, Cathode.

- Manufacturer: Texas Instruments (TI).
- Company type: American multinational semiconductor company that designs and manufactures analog, mixed-signal, and embedded processing integrated circuits.

TL431AIDR2G is a programmable shunt regulator. Common applications:
- SMPS feedback/regulation (flyback, buck converters)
- Precision adjustable voltage reference in linear/analog circuits
- LED driver control (constant current and dimming)
- Battery charger regulation (CV/CC)
- Protection/crowbar circuits (overvoltage protection)
- General voltage references for ADCs/microcontrollers and instrumentation.

Equivalent devices (3-pin programmable shunt regulators, ~2.495 V ref):
- TL431 family (TL431, TL431A/B/C) – same TI device family
- TLV431 (TI)
- NCP431 / NCP431A (On Semiconductor)
- AZ431 (Diodes Inc)
- KA431 / KA431A (ROHM)
These are pin-compatible with similar performance for adjustable shunt regulation.