LM431SBCM3X Replacement: NCP432BVSNT1G, ATL432BIDBZR

Original Part

LM431SBCM3X

onsemi

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±1% 100 mA SOT-23-3

Alternative Part

NCP432BVSNT1G

onsemi

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 40 µA SOT-23-3 (TO-236)

ATL432BIDBZR

Texas Instruments

Shunt Voltage Reference IC Adjustable 2.5V 36 VV ±0.5% 100 mA SOT-23-3

1. NCP432BVSNT1G Substitution Conclusion The NCP432BVSNT1G is compatible in package and basic functionality as a substitute; however, a key difference is its output current capability of only 40 µA, compared to the original LM431SBCM3X’s 100 mA. The NCP432BVSNT1G cannot provide equivalent load drive and is suitable only for very low‑power sensing or reference applications. Additionally, its cathode current requirement (100 mA) is opposite to that of the original part (1 mA), which may affect bias circuit design. Direct substitution is not feasible unless the application requires only microamp‑level current and the circuit is adapted accordingly.

2. ATL432BIDBZR Substitution Conclusion The ATL432BIDBZR matches the original part in package, output voltage range (2.5V–36V), and output current (100 mA). It also offers improved accuracy (±0.5% vs. original ±1%) and a slightly better temperature coefficient (48 ppm/°C). The main difference is its lower cathode current requirement of 80 µA (original: 1 mA), which may reduce power consumption in low‑power designs—provided the original circuit’s minimum operating current meets this condition. Overall, this device is a direct electrical and functional substitute with superior performance, though the low cathode current should be checked for potential stability issues under very light loads.

Analysis ID: 1309-18DD000

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