TL431BQDBZR,215

TL431BQDBZR is TI’s TL431 programmable precision shunt regulator in a RoHS SOT-23-3 package. It behaves as an adjustable zener with a fixed 2.495 V reference and uses an external resistor divider on the REF pin to regulate the cathode current, enabling precise voltage regulation in feedback loops for power supplies.
Key points:
- Reference: Vref ≈ 2.495 V (typical). Accuracy depends on grade (roughly 0.5–1% typical).
- Output: sinks up to ~100 mA; maximum cathode–anode voltage ≈ 36 V.
- Package: BQDBZR denotes the SOT-23-3 RoHS variant with tape-and-reel; “215” is likely a date/lot code.
- Applications: regulator feedback, reference regulators, voltage reference circuits.
- Quick usage: connect a resistor divider from the output to REF; the device forces REF to ~2.495 V to set the regulated output.
For exact electrical specs and pinout, consult the TL431BQDBZR datasheet.

Equivalent parts to TL431BQDBZR,215 include: TL431/TLV431 (TI); AZ431/AZ431A (Diodes Inc.); NCP431/NCP431A (ON Semiconductor); REF431/REF431A (Analog Devices). All are 2.495 V programmable shunt regulators with similar pinouts and performance.

TL431BQDBZR is the TL431 family programmable shunt regulator. Key features:
- 2.495 V reference (precision adjustable shunt)
- Output set by external resistor divider: Vout = Vref(1 + R2/R1) + Iadj·R2
- Cathode current sink: 1 mA to about 100 mA; minimum for regulation ~1 mA
- Reference accuracy: typically ±0.5% @ 25°C (A-grade); wider tolerance for other grades
- Wide voltage range: up to 36 V across cathode–anode
- Good line/load regulation and low dynamic impedance; fast transient response
- Industrial temp range: typically -40°C to 125°C
- Built-in short/overcurrent protection
- Package: SOT-23-3 (DBZR), RoHS-compliant (lead-free)
Note: Exact grades and specs can vary by lot; check datasheet for the specific “BQDBZR” lot variant.

Pin count: 3 pins.
Function: TL431BQDBZR is a programmable precision shunt regulator (adjustable reference). It sinks current to regulate the cathode–anode voltage so that the reference input is held at about 2.495 V. Used as a programmable Zener in regulation loops.
Typical pinout for SOT-23-3: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE.

- Manufacturer: Texas Instruments (TI).
- What kind of company: An American multinational semiconductor company that designs and manufactures analog and embedded processing integrated circuits; headquartered in Dallas, Texas, and one of the world's largest semiconductor makers.

TL431BQDBZR is an adjustable precision shunt regulator (programmable Zener). Common applications:
- Feedback reference in linear and switching regulators (sets output via resistor divider)
- Post-regulation reference for LDOs and instrumentation
- Overvoltage/crowbar protection in power rails
- Constant-current LED driver circuits
- Battery chargers and power-management circuits
- Isolated feedback in flyback/off-line supplies with optocouplers
- Precision references for ADC/DAC and other instrumentation
Note: Vref ~2.495 V; adjustable from the surrounding circuit via external resistors.

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