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Texas Instruments TL431LIAQDBZR — Analog & Data Acquisition

TL431LIAQDBZR Shunt Voltage Reference, 2.495V, ±1%, SOT-23-3

MPNTL431LIAQDBZR
Active

Texas Instruments TL431LIAQDBZR, adjustable shunt voltage reference, ±1% tolerance, 2.495V min output, 36V max, 15 mA output, 1 mA cathode current, -40°C to 125°C, SOT-23-3 surface mount.

$0.3900Ref. price · indicative, final on quote
Texas Instruments TL431LIAQDBZR datasheet (PDF)
PackagingTO-236-3, SC-59, SOT-23-3
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

TL431LIAQDBZR specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Output current15 mA
Current - cathode1 mA
Operating temperature-40°C ~ 125°C (TA)
PackageTape & Reel (TR) Cut Tape (CT)
Tolerance±1%
CaseTO-236-3, SC-59, SOT-23-3

Product details

Adjustable shunt reference in a SOT-23-3 package

It provides a 2.495V reference at the cathode with a ±1% tolerance, settable to any value up to 36 V with two external resistors.

Cathode current and output drive

The shunt regulator requires a minimum cathode current of 1 mA to maintain regulation, and the output can sink up to 15 mA. This current budget is enough to bias an optocoupler LED in a flyback feedback loop or to drive a small load directly. The 1 mA minimum means the biasing resistor from the supply rail must be sized to guarantee at least that current at the lowest input voltage and highest load.

It is ROHS3 compliant.

Frequently asked questions

What is the accuracy tolerance of TL431LIAQDBZR?

The TL431LIAQDBZR is specified with a ±1% tolerance on the reference voltage. This is the standard accuracy grade for general-purpose shunt reference applications.

What is the typical cathode current of TL431LIAQDBZR?

The minimum cathode current required for regulation is 1 mA. The maximum output current the device can sink is 15 mA.

How does TL431LIAQDBZR compare to a series reference like the LM4132?

The TL431LIAQDBZR is a shunt reference, meaning it sinks current and requires an external resistor to set the bias. A series reference like the LM4132AMF-4.1/NOPB sources a fixed output voltage (4.096 V) with a much tighter tolerance (±0.05%) and lower noise (350 µVp-p, 0.1 Hz to 10 Hz). The shunt topology is simpler for adjustable outputs and higher voltages; the series reference is better for precision fixed-rail applications where noise and drift matter most.