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TL431QDR

TL431QDR Shunt Regulator, Adjustable 2.495V Ref, 100 mA

MPNTL431QDR
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Texas Instruments TL431QDR, adjustable shunt regulator, 2.495 V reference, 100 mA output, ±2.2% tolerance, -40°C to 125°C, 8-SOIC package, surface mount.

$0.1002Ref. price · indicative, final on quote
Texas Instruments TL431QDR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

TL431QDR specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Output current100 mA
Current - cathode1 mA
Operating temperature-40°C~125°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±2.2%
Case8-SOIC (0.154\", 3.90mm Width)

Product details

Adjustable shunt regulator with a 2.495 V floor

Its internal reference is set at 2.495 V, and the output can be programmed up to 36 V using two external resistors. The part delivers up to 100 mA continuous cathode current, making it a workhorse for precision voltage references, series-pass regulators, and error amplifiers in isolated power supplies.

±2.2% tolerance and industrial temperature range

The TL431QDR carries a ±2.2% tolerance on the reference voltage, which is tighter than the standard ±2% or ±1% grades found in the TL431 family.

For the spare-parts storeroom, this means the reel can be ordered without worrying about a sudden discontinuation. Store the reels dry — the SOIC-8 package is moisture-sensitive, and a bake before reflow is needed if the seal is broken.

Frequently asked questions

What is the minimum cathode current for the TL431QDR?

The minimum cathode current is 1 mA. Below this level the device may not regulate properly. The 100 mA maximum output current defines the load-driving ceiling.

Is the TL431QDR equivalent to the TL431A?

The TL431QDR and TL431A are both adjustable shunt regulators in the TL431 family, but the TL431QDR carries a ±2.2% tolerance, while the TL431A is typically ±1%. The pinout is the same across the SOIC-8 package, so the QDR can replace the A grade in circuits where the looser tolerance is acceptable. For precision references, the A grade is the better fit.