With a cathode current capability of 100 mA and a minimum cathode current of 1 mA, it can drive optocouplers in isolated power supplies, set reference thresholds in comparators, or act as a low-dropout series regulator in non-isolated designs. The ±2.2% tolerance on the internal reference voltage suits general-purpose regulation where tighter grades (0.5% or 1%) are not required. For industrial or automotive environments, the TL431C or TL431I family members with extended temperature ranges would be the correct choice.
Any remaining stock in the supply chain is finite and typically sourced through independent distributors or surplus channels. The TL431 family includes many active variants in the same SOT-23-5 package with identical pinout — the key difference is the temperature grade and tolerance grade. Because the TL431CDBVRE4 is obsolete, any procurement for this exact order code will be fulfilled from existing surplus or broker inventory.
Package and footprint — SOT-23-5 layout notes
The TL431CDBVRE4 is supplied in a SOT-23-5 package (also designated SC-74A).