NCP431AVLPRAG Replacement: TL1431CLPME3, AS431IAZTR-G1

Original Part

NCP431AVLPRAG

onsemi

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±1% 40 µA TO-92 (TO-226)

Alternative Part

TL1431CLPME3

Texas Instruments

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.4% 100 mA TO-92-3

AS431IAZTR-G1

Diodes Incorporated

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA TO-92

1. TL1431CLPME3 Substitution Conclusion The TL1431CLPME3 can directly replace the original NCP431AVLPRAG, with two key distinctions to note: its tolerance is ±0.4% (superior to the original’s ±1%), improving reference voltage accuracy; however, its nominal cathode operating current is 1mA (compared to 100mA for the original). This requires re‑verification of load regulation in high‑current shunt applications, though compatibility remains satisfactory in typical low‑current reference circuits. Both devices share the same TO‑92 package and voltage range, with pin‑for‑pin functional compatibility, allowing substitution without peripheral circuit adjustments.

2. AS431IAZTR‑G1 Substitution Conclusion The AS431IAZTR‑G1 is generally suitable as a replacement for the original part, with notable differences: its tolerance is ±0.5% (an intermediate accuracy level), but its cathode current is only 50µA (significantly lower than the original’s 100mA). This indicates weaker dynamic load capability, limiting its use to micropower reference or signal‑level circuits; employing it to drive heavier loads may result in performance deviations. Additionally, the temperature coefficient is not specified, requiring empirical validation of stability over the intended temperature range. The package and voltage range are identical, and pins are compatible, making it a viable direct replacement in low‑power designs.

Analysis ID: 0FA4-E96A000

Based on part parameters and for reference only. Not to be used for procurement or production.