TL431BCLPRAG Replacement: AS431IAZTR-G1, AZ431AZ-ATRE1

Original Part

TL431BCLPRAG

onsemi

Shunt Voltage Reference IC Adjustable 2.495V 36 VV ±0.4% 100 mA TO-92-3

Alternative Part

AS431IAZTR-G1

Diodes Incorporated

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

AZ431AZ-ATRE1

Diodes Incorporated

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

1. AS431IAZTR-G1 Substitution Conclusion The AS431IAZTR-G1 matches the original TL431BCLPRAG in basic parameters such as output type, adjustable voltage range (up to 36V), output current (100mA), and package compatibility. However, several key differences exist: its nominal output voltage is 2.5V (original 2.495V), tolerance is ±0.5% (original ±0.4%), temperature coefficient is unspecified (original 50ppm/°C), and cathode current is 50µA (original 1mA). When substituting, the circuit may experience a slight output voltage deviation (~0.2%), slightly reduced accuracy, and uncertain temperature stability that could affect performance under high or low temperature conditions. The lower cathode current, while beneficial for reducing power consumption, may alter bias conditions, potentially causing abnormal reference voltage startup or dynamic response. The AS431IAZTR-G1 can only be considered as a cautious replacement in non‑precision applications with relaxed temperature requirements, and actual circuit compatibility verification is essential.

2. AZ431AZ‑ATRE1 Substitution Conclusion The AZ431AZ‑ATRE1 closely aligns with the original TL431BCLPRAG in key parameters, including adjustable voltage range, output current, tolerance (±0.4%), and cathode current (1mA), with identical package. The main differences are a nominal output voltage of 2.5V (original 2.495V) and a superior temperature coefficient of 20ppm/°C (original 50ppm/°C). The slight output voltage difference (~0.2%) is generally acceptable within the tolerance range, while the lower temperature coefficient indicates better voltage stability over temperature, improving system accuracy and reliability across a wide temperature range. The AZ431AZ‑ATRE1 presents a high feasibility for direct replacement of the original device, particularly in applications requiring enhanced temperature stability, with minimal circuit adjustment needed.

Analysis ID: 0AE2-CB6A000

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