TL431BILPE3 Replacement: TL431BILP, TL431AILPG

Original Part

TL431BILPE3

Texas Instruments

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.5% 100 mA TO-92-3

Alternative Part

TL431BILP

onsemi

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.4% 100 mA TO-92 (TO-226)

TL431AILPG

onsemi

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±1% 100 mA TO-92 (TO-226)

1. TL431BILP Substitution Conclusion The TL431BILP can generally serve as a replacement for the original part, though certain parameter differences should be noted. Key variations include: higher initial accuracy (±0.4% versus the original ±0.5%), a specified temperature coefficient (50 ppm/°C, which was not disclosed for the original), and a slightly higher cathode operating current (1 mA compared to 700 µA). In most applications, the TL431BILP offers a more stable voltage reference and improved temperature performance. However, the increased cathode current may require re-evaluation of the current-limiting resistor configuration in low-power designs. Package compatibility is maintained (TO-92-3 long-body aligns with TO-226AA pinout).

2. TL431AILPG Substitution Conclusion The TL431AILPG is functionally compatible with the original part, but involves trade-offs in key performance parameters. Main differences are lower initial accuracy (±1% versus the original ±0.5%), a specified temperature coefficient of 50 ppm/°C, and a cathode current of 1 mA. This variant is suitable only for applications with relaxed voltage reference accuracy requirements, such as non-precision regulation or switching power supply feedback loops. The wider output tolerance may affect overall system precision. Additionally, the impact of higher cathode current on circuit power dissipation should be assessed. The package remains physically compatible with the original.

Analysis ID: 1F03-DADC000

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