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Texas Instruments TL431BCDBZRG4 — Analog & Data Acquisition

TL431BCDBZRG4 Shunt Voltage Reference, ±0.5% Tolerance

MPNTL431BCDBZRG4
End of Life

Texas Instruments TL431BCDBZRG4, adjustable shunt voltage reference, 2.495V min output, 36V max, ±0.5% tolerance, 100 mA output, 600 µA cathode current, SOT-23-3 package, 0°C to 70°C.

$0.2160Ref. price · indicative, final on quote
Texas Instruments TL431BCDBZRG4 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

TL431BCDBZRG4 specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Output current100 mA
Current - cathode600 µA
Operating temperature0°C ~ 70°C (TA)
PackageTape & Reel (TR)
Tolerance±0.5%
CaseTO-236-3, SC-59, SOT-23-3

Product details

±0.5% tolerance — the accuracy tier that decides the BOM line

That tolerance is the selection differentiator: it holds the reference voltage at 2.495 V to within ±0.5%, which is tight enough for most closed-loop power-supply feedback paths without an external trim pot. The standard TL431B grade is ±0.5% at 25°C; the non-B grade is ±2% or ±1%, so this part is the accuracy tier for designs that need regulation better than 1% but do not require the premium 0.4% or 0.2% grades.

2.495 V to 36 V — adjustable output envelope

The reference sets a minimum output of 2.495 V (the internal bandgap) and can be programmed up to 36 V with two external resistors. This covers the common secondary-side regulation voltages in AC-DC converters (3.3 V, 5 V, 12 V, 24 V) and isolated DC-DC feedback loops. The 100 mA output current and 600 µA minimum cathode current define the load-driving and bias-current budget: the cathode must sink at least 600 µA to keep the reference in regulation, and the output can source up to 100 mA into the optocoupler LED or error-amplifier network.

SOT-23-3 — compact footprint for dense boards

The SOT-23-3 (also listed as TO-236-3 / SC-59) is a three-lead surface-mount package, 2.9 mm × 1.3 mm typical body size.

Frequently asked questions

What is the difference between TL431BCDBZRG4 and the standard TL431?

The primary difference is the reference voltage tolerance. TL431BCDBZRG4 is the ±0.5% grade (B-grade), while the standard TL431 is typically ±2% or ±1% depending on the suffix. The B-grade holds tighter regulation across temperature and is the preferred choice when the feedback loop accuracy must stay within 1% without external trimming.

Does TL431BCDBZRG4 have a pin-compatible equivalent that is easier to source?

The TL431 family is second-sourced by multiple manufacturers (ON Semiconductor, STMicroelectronics, Microchip) with the same SOT-23-3 pinout and function. Any ±0.5% B-grade TL431 in SOT-23-3 from a qualified supplier is a direct drop-in replacement. Qualify the alternate now to avoid single-source exposure on the BOM line.