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Texas Instruments TL431CDBZTG4 — Analog & Data Acquisition

TL431CDBZTG4 Shunt Voltage Reference, ±2.2% Tolerance

MPNTL431CDBZTG4
End of Life

Texas Instruments TL431CDBZTG4 adjustable shunt voltage reference, ±2.2% tolerance, 2.495 V reference, 100 mA output, SOT-23-3 package, 0°C to 70°C.

Texas Instruments TL431CDBZTG4 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

TL431CDBZTG4 specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Output current100 mA
Current - cathode1 mA
Operating temperature0°C~70°C(TA)
PackageTape & Reel (TR)
Tolerance±2.2%
CaseTO-236-3, SC-59, SOT-23-3

Product details

Adjustable shunt reference in a SOT-23-3 package

It sets a nominal 2.495 V reference between the cathode and the reference pin, and by adding two external resistors you can program the output voltage anywhere from 2.495 V up to 36 V. The shunt architecture means it acts like a zener diode but with much tighter tolerance and temperature stability — the ±2.2% tolerance on the reference voltage is a practical spec for setting a supply rail or a comparator threshold without trimming.

100 mA cathode current and 1 mA minimum bias

The device can sink up to 100 mA through the cathode, which is enough to drive an optocoupler LED in a feedback loop or to pull down a small relay coil through a transistor. For a typical 5 V rail with a 1 kΩ series resistor, the cathode current sits around 2.5 mA at the reference voltage, leaving headroom for load transients.

If your design needs to live in an engine bay, an outdoor telecom cabinet, or a factory floor without climate control, the TL431CDBZTG4 is not the right temperature grade — look for the TL431I (industrial, -40°C to 85°C) or TL431Q (automotive) variants in the same family. The 'C' in the part number is the temperature-grade indicator.

Frequently asked questions

What is the tolerance of TL431CDBZTG4?

The TL431CDBZTG4 has a ±2.2% tolerance on the reference voltage. This means the 2.495 V reference can vary between approximately 2.440 V and 2.550 V worst-case over temperature and process. For a 5 V output supply using a divider, that translates to about ±110 mV of output variation — acceptable for many logic and analog rails, but not for precision ADC references where a 0.5% or 0.1% grade is needed.

Is TL431CDBZTG4 equivalent to TL431ACDBZ?

The TL431ACDBZ is the same base TL431 adjustable shunt reference but in a different package (SOT-23-3 as well, but the 'C' vs 'AC' suffix indicates a tighter tolerance grade — the TL431ACDBZ is typically ±1% while the TL431CDBZTG4 is ±2.2%. Both are pin-compatible and functionally identical, but the AC grade gives you tighter output accuracy. If your BOM calls for the AC grade, the CDBZTG4 is a drop-in replacement only if the looser tolerance is acceptable for your application.

Can TL431CDBZTG4 output 100 mA?

Yes, the TL431CDBZTG4 is rated for a maximum cathode current of 100 mA. This is the current it can sink from the cathode to the anode when the reference pin is held above the 2.495 V threshold. In practice, the power dissipation in the SOT-23-3 package limits how much of that 100 mA you can use at elevated ambient temperatures — at 70°C with minimal copper on the PCB, derate to about 60-70 mA continuous to stay within the junction temperature limit.