Skip to main content
Log in
STMicroelectronics TL431AIZ — Analog & Data Acquisition

TL431AIZ Shunt Reference, Adjustable 2.495V to 36V, ±1%

MPNTL431AIZ
Active

STMicroelectronics TL431AIZ, Shunt Voltage Reference, Adjustable Output, ±1% Tolerance, 100 mA Output, 2.495V Min / 36V Max, TO-92-3 Through Hole, -40°C to 105°C, Active, ROHS3.

$0.4900Ref. price · indicative, final on quote
STMicroelectronics TL431AIZ datasheet (PDF)
PackagingTO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

TL431AIZ specifications
ParameterValue
Output typeAdjustable
MountingThrough Hole
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Output current100 mA
Current - cathode700 µA
Operating temperature-40°C ~ 105°C (TA)
PackageBulk
Tolerance±1%
CaseTO-226-3, TO-92-3 (TO-226AA) Formed Leads

Product details

The part sinks up to 100 mA and requires only 700 µA cathode current to regulate.

Adjustable output — how the range works

The output voltage is set by a resistor divider from the cathode to the reference pin. The minimum fixed voltage is 2.495 V, and the maximum is 36 V. That range covers most low-voltage and mid-voltage regulation needs. The 100 mA output current is the sink capability, not a source: the TL431 pulls current to ground to regulate the voltage across the load and series resistor.

For dual-sourcing or a surface-mount alternative, the TL1431ACL5T is a functional second source with ±0.25% tolerance but a narrower temperature range (-20°C to 70°C) and surface-mount package.

Frequently asked questions

What is the equivalent or replacement for TL431AIZ?

A functional second source with tighter tolerance is the TL1431ACL5T, which offers ±0.25% tolerance but in a surface-mount package and a narrower -20°C to 70°C temperature range. For a direct through-hole replacement, stay within the TL431 family in TO-92.

Can TL431AIZ be used as a comparator?

Yes, the TL431 can function as a low-cost comparator by using the reference pin as the non-inverting input and the cathode as the open-collector output. The switching threshold is the internal 2.495 V reference.

How do I adjust the output voltage of TL431AIZ?

Connect a resistor divider from the cathode to the reference pin. The output voltage Vout = 2.495 V × (1 + R1/R2). Choose R1 and R2 to set the desired voltage within the 2.495 V to 36 V range.