LT311AN8

Overview

The LT311AN8 is a high-speed comparator manufactured by Analog Devices Inc., housed in an 8-pin DIP package. It features a differential input stage with a common-mode range extending to the negative supply rail, allowing operation from single or split supplies. The device provides a TTL-compatible open-collector output capable of sinking up to 16 mA. Key electrical characteristics include a typical propagation delay of 40 ns and a slew rate of 0.5 V/µs. It operates within a supply voltage range of ±2 V to ±18 V, ensuring compatibility with various logic families and signal levels.

Feature Summary

• Differential input stage with common-mode range including the negative supply rail
• TTL-compatible open-collector output for direct interface with digital logic
• High-speed performance with low propagation delay
• Operates on single or dual power supplies

Applications

• Precision timing circuits
• Voltage monitoring systems
• Phase-locked loops
• Automatic gain control

Procurement Notes

Verify the specific manufacturer lot code and date code upon receipt to ensure component authenticity. Confirm that the package matches the standard 8-pin DIP configuration. Check for any physical damage to pins or the housing before integration into the circuit design. Ensure the operating environment remains within the specified temperature and voltage limits defined in the official datasheet.

Selection Notes

Select this component when a fast response time is required alongside a simple open-collector output interface. It is suitable for applications where the input signal swings near the negative rail. Consider the power supply requirements and thermal dissipation capabilities of the DIP package. Evaluate if the current sourcing capability meets the load requirements of the downstream logic gates.

Part Context

This part belongs to the LT1011/LT311 family of comparators known for their robust performance and wide supply voltage range. The series is designed for general-purpose comparison tasks in industrial and consumer electronics. The analog nature of the device allows for precise threshold detection in noisy environments.

Replacement Considerations

Compatible substitutes include the LM311 and LM339N, though pinouts and electrical specifications may vary slightly. Verify that the alternative device supports the same supply voltage range and output current capabilities. Ensure the replacement maintains the required propagation delay and input offset voltage characteristics for the specific application.