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Texas Instruments TL431AILPE3 — Analog & Data Acquisition
Texas Instruments

TL431AILPE3 Shunt Voltage Reference, 2.495V, ±1%, TO-92-3

MPNTL431AILPE3
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Texas Instruments TL431AILPE3, adjustable shunt voltage reference, 2.495V min output, 100 mA output, ±1% tolerance, TO-92-3 through-hole package, -40°C to 85°C operating temperature.

$0.9700Ref. price · indicative, final on quote
TL431AILPE3 datasheet
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Specifications

TL431AILPE3 Technical Specifications
ParameterValue
Output typeAdjustable
Mounting typeThrough Hole
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Current - output100 mA
Current - cathode700 µA
Operating temperature-40°C~85°C(TA)
PackageBulk
Tolerance±1%
CaseTO-226-3, TO-92-3 (TO-226AA)

Product details

2.495 V shunt reference in a TO-92-3

It operates as a programmable Zener — two external resistors set the output anywhere from the 2.495 V minimum up to 36 V maximum. The TO-92-3 through-hole package (TO-226AA) makes it a staple for breadboard prototyping, low-volume production, and repair stock where hand-assembly or socketing is preferred.

100 mA cathode current and 700 µA minimum bias

The shunt can sink up to 100 mA continuous, which sets the load range for a regulated rail or the sense current in an optocoupler feedback loop. The minimum cathode current of 700 µA defines the floor for the bias resistor — go below that and the reference drops out of regulation. For a typical 5 V rail, a 3.3 kΩ series resistor keeps the cathode current safely above 700 µA while staying within the 100 mA ceiling at full load.

Frequently asked questions

What is the closest pin-compatible alternative to the TL431AILPE3?

The standard TL431 grade (e.g., TL431CLP) is pin-compatible but carries a ±2% initial tolerance instead of the ±1% on this I-grade variant. For designs that can accept the wider tolerance, the standard grade is a drop-in substitute; for precision supplies the I-grade is the tighter fit.