LT1009IS8#PBF

Voltage Reference Overview

The LT1009IS8#PBF is a precision trimmed 2.5V shunt regulator diode manufactured by Analog Devices Inc. It features a maximum initial tolerance of 0.4% and operates within an extended temperature range of -40°C to +85°C. The device provides a guaranteed average temperature coefficient of 35 ppm/°C across the full operating range. Electrical specifications include a reverse breakdown voltage of 2.495V to 2.51V at 1mA, with a maximum dynamic impedance of 1.0Ω. It supports a wide operating current range from 400μA to 10mA and is housed in an 8-lead plastic SO package.

Voltage Reference Feature Summary

• Precision on-chip trimming minimizes initial voltage tolerance and temperature drift without requiring external adjustments.
• Includes a third terminal allowing reference voltage adjustment of ±5% to calibrate out system errors.
• Low dynamic impedance and wide operating current range enhance versatility in various circuit designs.
• Designed as a direct pin-to-pin replacement for LM136 components, eliminating the need for external trim networks.

Voltage Reference Applications

• Reference for 5V systems
• 8-Bit A/D and D/A converter references
• Digital voltmeters
• Current loop measurement and control systems
• Power supply monitors

Voltage Reference Procurement Notes

Verify that the specific IS8 suffix corresponds to the industrial temperature grade (-40°C to +85°C) rather than the commercial variant. Confirm the package type matches the required PCB footprint for the 8-lead SOIC configuration. Ensure the design accounts for the specified operating current limits to maintain accuracy. Check for lead-free compliance requirements if applicable to the target assembly process.

Voltage Reference Selection Notes

Select this component when a stable 2.5V reference is needed with moderate precision requirements. The extended temperature range makes it suitable for industrial environments where commercial parts may fail. Consider the adjustable terminal if system calibration is necessary to compensate for trace errors. Compare against lower-drift alternatives like the LT1019 if tighter thermal stability is critical for the application.

Voltage Reference Part Context

This part belongs to the LT1009 series of precision shunt regulators. The series includes variants with different temperature grades and packages, such as the TO-46 metal can and TO-92 plastic options. The IS8 designation specifically denotes the industrial temperature range and surface-mount SOIC packaging, distinguishing it from the commercial C-grade or obsolete MH versions.

Voltage Reference Replacement Considerations

The datasheet confirms direct interchangeability with the LM136 for improved performance without modifying the external trim network. Verify pinout compatibility before substitution. For applications requiring lower temperature drift, consider the LT1019 as a higher-performance alternative within the same product family.