LT1461BIS8-4#TRPBF

Voltage Reference Overview

The LT1461BIS8-4#TRPBF is a micropower precision low dropout series voltage reference from Analog Devices, housed in an 8-lead plastic SO package. It provides a fixed 4.096V output with an initial accuracy of ±0.06% and a maximum temperature coefficient of 7ppm/°C over the industrial range of –40°C to 85°C. The device draws a typical supply current of 35µA and supports up to 50mA output drive. It features a shutdown pin for power management and includes thermal limiting protection.

Voltage Reference Feature Summary

• Advanced curvature compensation techniques ensure low temperature drift and high stability across operating conditions.
• Integrated shutdown capability allows for system power down and full load current switching via logic control.
• Thermal limiting circuitry protects the component from overload conditions by regulating junction temperature.
• Low dropout design maximizes battery life in portable applications while maintaining precise reference performance.

Voltage Reference Applications

• A/D and D/A converters
• Precision regulators
• Handheld instruments
• Power supplies

Voltage Reference Procurement Notes

Verify the #TRPBF suffix indicates tape and reel packaging when sourcing this specific variant. Confirm the BIS grade corresponds to the required industrial temperature range and accuracy specifications. Ensure compatibility with existing board layouts regarding the 8-lead SO package dimensions and pinout configuration.

Voltage Reference Selection Notes

Select this part for applications requiring high accuracy with low quiescent current. The 4.096V output is suitable for driving ADCs directly. Consider the 7ppm/°C drift specification against system error budgets. The shutdown feature adds flexibility for power-sensitive designs compared to non-shutdown variants.

Voltage Reference Part Context

This component belongs to the LT1461 family of bandgap references. The 'B' designation indicates ±0.06% initial accuracy, while 'I' specifies the industrial temperature range. The 'S8' denotes the 8-lead SOIC package, and '#TRPBF' confirms the tape and reel lead-free finish packaging format.

Voltage Reference Replacement Considerations

LT1461BIS8-4#PBF serves as the tube-packaged equivalent with identical electrical characteristics.

Voltage Reference FAQ

How does the shutdown pin affect the output voltage?

Driving the shutdown pin low turns off the output current, reducing supply current to a maximum of 35µA. The reference powers up in approximately 200µs after the pin is released or driven high.

What is the purpose of the thermal limiting feature?

Thermal limiting protects the part from overload conditions by preventing the junction temperature from exceeding safe limits, typically around 150°C, thereby avoiding permanent damage during high dissipation events.