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TL431AIDG4
Texas Instruments

TL431AIDG4 Shunt Regulator, 2.495 V Ref, ±1%, 8-SOIC

MPNTL431AIDG4
End of Life

Texas Instruments TL431AIDG4, adjustable shunt voltage reference, 2.495 V min output, 36 V max, ±1% tolerance, 100 mA output, 700 µA cathode current, 8-SOIC surface-mount package, -40°C to 85°C operating temperature.

$0.5100Ref. price · indicative, final on quote
TL431AIDG4 datasheet
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Specifications

TL431AIDG4 Technical Specifications
ParameterValue
Output typeAdjustable
Mounting typeSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Current - output100 mA
Current - cathode700 µA
Operating temperature-40°C~85°C(TA)
PackageTube
Tolerance±1%
Case8-SOIC (0.154\", 3.90mm Width)

Product details

Precision shunt reference for 5 V and higher rails

The ±1% initial tolerance means you can hold a 5 V output within 50 mV without trimming — useful in isolated flyback supplies, battery chargers, and industrial control loops where the reference sets the regulation point.

Output current and cathode bias — what they mean for loop stability

Rated for 100 mA continuous output current, the TL431AIDG4 can sink enough current to drive the optocoupler LED in a feedback loop or pull down a pass-transistor base. The minimum cathode current is 700 µA — stay above that to keep the reference in its linear region; a bias resistor from the cathode to the supply rail is the usual fix. The 8-SOIC package keeps the thermal path short; at 100 mA and 36 V the dissipation is 3.6 W, so a copper pour under the package helps.

Frequently asked questions

Can TL431AIDG4 be used as a shunt regulator for a 5 V supply?

Yes. With a 2.495 V internal reference and a maximum output of 36 V, the TL431AIDG4 can regulate a 5 V rail by setting the resistor divider ratio. The ±1% tolerance keeps the output within 50 mV of the target without external trim.

What is the closest pin-compatible alternative to TL431AIDG4?

Within the TL431 family, the TL431AIDBZR is a direct functional equivalent in a smaller SOT-23-3 package, but it is not pin-compatible with the 8-SOIC footprint. For a drop-in 8-SOIC replacement, the TL431ACD shares the same pinout and ±1% tolerance grade.