TL431AIZT

Product Overview

The STMicroelectronics TL431AIZT is a shunt voltage reference IC intended for precision biasing and regulation tasks in through-hole circuit boards. It provides an adjustable reference function with a 2.495 V minimum or fixed output voltage and a maximum output voltage of 36 V, while supporting a 100 mA output current. The device has ±1% tolerance and a 700 µA cathode current characteristic, making it suitable for reference, feedback, and monitoring circuits where a shunt reference is required. Its TO-92-3 package with formed leads supports through-hole mounting, and the operating temperature range is -40°C to 105°C ambient.

Key Features

• Shunt voltage reference architecture with adjustable output capability.
• 2.495 V minimum or fixed output voltage and 36 V maximum output voltage.
• 100 mA output current.
• ±1% tolerance and 700 µA cathode current.
• Through-hole mounting in TO-92-3 and TO-226-3 formed-lead package.
• Operating temperature range of -40°C to 105°C ambient.

Applications

• Adjustable reference circuits for biasing and level setting.
• Feedback reference networks in regulated power supplies.
• Shunt reference points in measurement, monitoring, and control interfaces.
• Reference setting in threshold and monitoring circuits.

Design & Procurement Notes

When selecting the TL431AIZT for a board design, confirm that the required reference voltage is within the 2.495 V minimum or fixed output and 36 V maximum output range, and that circuit currents remain compatible with the 100 mA output and 700 µA cathode current values. The ±1% tolerance should be included in the error budget for precision biasing or feedback applications. Because the device uses a TO-92-3 through-hole package with formed leads, layout and mechanical clearance should accommodate the package and lead style rather than surface-mount assumptions. The -40°C to 105°C ambient operating range supports designs that must operate over extended temperature conditions, provided the actual board thermal environment remains within that range.