Specs side by side
2 parts compared · 14 differing specs across 14 total parameters.
| Parameter | ||
|---|---|---|
| Supply voltage | Cathode voltage up to 36V; cathode current 1mA to 100mA; reference 2.495V typical. | - |
| Memory & Peripherals | Adjustable output from VREF up to the cathode ceiling with a two-resistor divider - identical topology. | - |
| Case | SOT-23 / TO-92 | SOT-23 / TO-92 / SOT-89 / SOIC-8 |
| Compatibility Level | 100% Drop-in (Zero Code Change) | - |
| Component Category | - | Programmable Shunt Voltage References |
| Core & Architecture | Functionally identical 2.495V shunt regulator from a licensed source; tolerance grades track the same letter system (A = 1 percent, B = 0.5 percent, plain = 2 percent). | - |
| Firmware Notes | Match the grade letter when substituting into a regulated rail: a 2 percent grade in place of a 0.5 percent part loosens the output tolerance directly. | - |
| Hardware Notes | Verify the pinout against the specific vendor package drawing - the 431 family has multiple pinouts across vendors. In the common SOT-23 the TL431 is pin 1 CATHODE, pin 2 REF, pin 3 ANODE; in TO-92 (at least the TI drawing) it is pin 1 CATHODE, pin 2 ANODE, pin 3 REF. | - |
| Lead Time Advantage | Shenzhen Spot Stock (24-48h Dispatch) | - |
| Market Reality | - | The TL431 sits in the feedback loop of a large share of the flyback supplies ever built - one of the highest-volume analog parts in existence. Genuine supply is never the issue. The issues are three: the tolerance grade (2 percent / 1 percent / 0.5 percent) that decides regulation accuracy, the pinout that differs between TL431 and TL432 and between packages, and the lookalike low-voltage parts (TLV431, LMV431) that are not drop-ins at all. A repair that fits the right part with the wrong orientation simply does not regulate. |
| Reference Part | TL431 | - |
| Role In Circuit | - | Original Reference Part |
| Sourcing Advantage | Standard stock; original factory reels and automated production packaging. | - |
| Sourcing Status | - | Active Shenzhen Spot Sourcing (24–48h) |