LT1638HS8

Instrumentation, Op Amps, Buffer Amps Overview

The LT1638HS8#PBF is a dual micropower operational amplifier from Analog Devices, housed in an 8-lead plastic SO package. It features rail-to-rail input and output capabilities with a gain bandwidth product of 1.2MHz and a slew rate of 0.4V/µs. The device operates on supplies ranging from 2.5V to 44V, drawing only 170µA per amplifier. It includes reverse battery protection up to 18V and over-the-top input capability handling voltages up to 44V. The industrial temperature grade ensures reliable performance across a wide operating range.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Operates with inputs above the positive supply rail
• Reverse battery protection up to 18V
• Rail-to-rail input and output swing
• No phase reversal when inputs go below negative supply

Instrumentation, Op Amps, Buffer Amps Applications

• Battery or solar-powered systems
• Portable instrumentation
• Sensor conditioning circuits
• Supply current sensing
• Micropower active filters

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging and RoHS compliance as defined by the manufacturer. Confirm the HS8 designation corresponds to the high-temperature industrial grade (–40°C to 125°C) and the SOIC-8 package type. Ensure the source document explicitly lists this part number for availability in your region.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when high common-mode voltage tolerance exceeding the supply rail is required. The low quiescent current makes it suitable for battery-operated designs. Verify that the 25mA output drive capability meets load requirements. Consider the 1.2MHz bandwidth for signal processing needs within the specified temperature range.

Instrumentation, Op Amps, Buffer Amps Part Context

This device belongs to the LT1638/LT1639 family of micropower op amps. The LT1638 variant provides two amplifiers in compact packages including SOIC, MSOP, and DFN. The family is designed for general-purpose applications requiring rail-to-rail performance and high voltage input tolerance in low-power environments.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Consult Analog Devices marketing for parts specified with wider operating temperature ranges if higher thermal limits are needed. Verify pinout compatibility and electrical specifications against other dual rail-to-rail amplifiers before substitution.

Instrumentation, Op Amps, Buffer Amps FAQ

How does the LT1638 handle inputs above the positive supply?

The device incorporates Over-The-Top capability, allowing inputs to operate up to 44V above the negative supply regardless of the positive supply voltage, utilizing internal Schottky diodes to manage saturation.

What is the reverse battery protection limit?

The LT1638 provides reverse battery protection up to 18V, during which the supply current remains less than 1nA.