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Texas Instruments TL431BILPRE3 — Analog & Data Acquisition
Texas Instruments

TL431BILPRE3 Shunt Reference, ±0.5% Tolerance, TO-92-3

MPNTL431BILPRE3
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Texas Instruments TL431BILPRE3, adjustable shunt voltage reference, ±0.5% tolerance, 100 mA output, 2.495 V min, TO-92-3 through-hole, -40 to 85°C.

$0.5300Ref. price · indicative, final on quote
TL431BILPRE3 datasheet
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Specifications

TL431BILPRE3 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)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±0.5%
CaseTO-226-3, TO-92-3 (TO-226AA) Formed Leads

Product details

What the ±0.5% tolerance buys you in a shunt reference

For a 5 V rail derived from a 2.5 V reference and a resistor divider, that translates to a worst-case output error of about ±25 mV before resistor tolerances are added.

100 mA cathode current — what it can and cannot drive

The 100 mA output current rating is the maximum continuous cathode current the device can sink while maintaining regulation. In practice, this is enough to bias an optocoupler LED in a feedback loop, supply a small auxiliary load, or drive the base of an external pass transistor for higher-current regulation.

Through-hole TO-92-3 — fit for retrofit and low-volume builds

The TO-92-3 package with formed leads is a through-hole form factor that mates with 0.100-inch pitch breadboards, perfboards, and legacy PCB layouts. It is a direct pin-compatible drop-in for any TL431 in a TO-92 package, making it a natural choice for repairing older power supplies or prototyping without re-spinning the board. The formed leads are pre-bent for vertical mounting; the straight-lead variant (TO-92-3 straight) is a different order code.

Frequently asked questions

What is the tolerance of TL431BILPRE3?

The TL431BILPRE3 carries a ±0.5% tolerance on the internal 2.495 V reference voltage. This is the tightest standard tolerance grade in the TL431B family; the standard TL431 is ±2%, and the TL431A is ±1%.

Can TL431BILPRE3 replace TL431?

Yes — the TL431BILPRE3 is a pin-compatible, tighter-tolerance (±0.5% vs ±2%) drop-in replacement for the standard TL431 in the same TO-92-3 package. The pinout (cathode, anode, reference) is identical across the TL431 family.