LT1461ACS8-2.5#PBF

Voltage Reference Overview

The LT1461ACS8-2.5#PBF is a micropower precision low dropout series voltage reference manufactured by Analog Devices Inc. It provides a fixed 2.5V output with an initial accuracy of ±0.04% and a maximum temperature coefficient of 3ppm/°C. The device operates within a specified commercial temperature range of 0°C to 70°C, drawing a typical supply current of 35µA and supporting a minimum output drive current of 50mA. It features a shutdown pin for power management and thermal limiting protection.

Voltage Reference Feature Summary

• Combines high accuracy and low drift with low supply current and high output drive capability
• Utilizes advanced curvature compensation techniques and trimmed precision thin-film resistors
• Includes a shutdown feature for system power down and load current switching
• Incorporates thermal shutdown protection against overload conditions

Voltage Reference Applications

• A/D and D/A Converters
• Precision Regulators
• Handheld Instruments
• Power Supplies

Voltage Reference Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free finish and tube packaging when sourcing. Confirm the 'A' grade designation corresponds to the required 0.04% accuracy and 3ppm/°C temperature coefficient specifications. Ensure the commercial temperature range (0°C to 70°C) meets the application requirements, as industrial or high-grade variants are available with different suffixes.

Voltage Reference Selection Notes

Select this component for applications requiring precise voltage references with minimal power consumption. The 2.5V output option is suitable for systems needing stable reference levels without external trimming. Consider the 50mA output drive capability for driving moderate loads directly. Verify that the commercial temperature range aligns with the operational environment, as wider ranges require different part grades.

Voltage Reference Part Context

This part belongs to the LT1461 family of micropower precision low dropout series voltage references. The family offers various output voltages including 2.5V, 3V, 3.3V, 4.096V, and 5V. The 'ACS8' designation identifies the specific accuracy grade, package type, and output voltage combination within the broader product line.

Voltage Reference Replacement Considerations

LT1461AIS8-2.5#PBF: Industrial grade version with -40°C to 85°C range.

Voltage Reference FAQ

What is the function of Pin 3 on the LT1461ACS8-2.5#PBF?

Pin 3 is the Shutdown (SHDN) pin. Driving it low shuts off the load current, reducing supply current to a maximum of 35µA. It operates normally when open or at logic high (≥2.4V).

How does the LT1461 handle thermal overload?

The device includes thermal shutdown protection that limits the junction temperature to approximately 150°C, turning off the output if exceeded to protect the part from damage.