Analog Devices Inc. LT1167IS8-1#PBF

Overview

LT1167IS8-1#PBF from Analog Devices (formerly Linear Technology) is a precision instrumentation amplifier requiring only one external resistor to set gains from 1 to 10,000. It delivers 7.5nV/√Hz input voltage noise at 1kHz, 0.3μV/°C max input offset drift, and 90dB min CMRR at G=1 - optimized for high-impedance bridge sensor interfaces in industrial pressure and medical transducer systems.

For engineers reviewing the LT1167IS8-1#PBF datasheet, LT1167IS8-1#PBF pinout, LT1167IS8-1#PBF application, or LT1167IS8-1#PBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, laser-trimmed 75μV max input offset voltage (I-grade), single-resistor gain programming, and IEC 1000-4-2 Level 4 ESD compliance with two 5kΩ external resistors.

Technical Context

The LT1167IS8-1#PBF implements a three-op-amp instrumentation architecture with superbeta NPN input transistors enabling 350pA max input bias current and 200GΩ input resistance. Its gain equation G = 1 + (49.4kΩ/R_G) is stabilized by laser-trimmed 24.7kΩ internal resistors, ensuring 0.14% max gain error at G=10 across temperature.

Unlike the standard LT1167, the "-1" variant features improved input current behavior at high common-mode voltages - critical for unbuffered strain gauge and thermocouple amplifiers where input nodes operate near supply rails. The REF pin provides precise output level shifting with ±1.6V headroom from supplies.

Key Specifications

Pinout & Package

LT1167IS8-1#PBF is housed in an 8-lead plastic SOIC (S8) package with JEDEC MS-012AC outline, 1.27mm pitch, and 5.0mm × 6.2mm footprint - compatible with standard automated assembly processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with AD8421ARZ and INA128UA, the LT1167IS8-1#PBF uniquely combines guaranteed –40°C to +85°C performance, IEC 1000-4-2 Level 4 compliance, and ultra-low input bias current in an SO-8 package - making it optimal for ruggedized, low-power bridge and thermocouple systems where long-term stability and ESD robustness are critical.

Availability

LT1167IS8-1#PBF is available at Aetrix Electronics and suitable for industrial pressure transducers, medical biopotential monitors, aerospace strain gauge systems, and portable environmental sensors requiring stable component supply across extended temperature ranges.

Supply support for LT1167IS8-1#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio, renowned for high-performance op amps, instrumentation amplifiers, and data converters.

The LT1167 product line was designed specifically for high-accuracy, low-power sensor signal conditioning - targeting applications where laser-trimmed DC precision, single-resistor gain flexibility, and industrial temperature reliability are mandatory.

FAQ

What is the maximum gain achievable with LT1167IS8-1#PBF and how is it set?

The LT1167IS8-1#PBF supports gains from 1 to 10,000 using a single external resistor RG connected between pins 1 and 8. The gain equation is G = 1 + (49.4kΩ/RG); for G=10,000, RG = 4.94Ω. The LT1167IS8-1#PBF's laser-trimmed internal resistors ensure this relationship holds across –40°C to +85°C with ≤0.18% gain error.

How does the "-1" suffix differentiate LT1167IS8-1#PBF from standard LT1167IS8#PBF?

The "-1" suffix denotes enhanced input current behavior at high common-mode voltages - specifically, LT1167IS8-1#PBF maintains ≤350pA input bias current up to ±10V common-mode, whereas the standard LT1167IS8#PBF exhibits increased current above ±5V. This makes LT1167IS8-1#PBF preferred for unbuffered thermocouples and high-side bridge configurations.

Can LT1167IS8-1#PBF operate from a single 5V supply?

Yes - the LT1167IS8-1#PBF supports single-supply operation from 4.6V (±2.3V) to 36V (±18V). With V– tied to ground, the REF pin must be biased ≥1.6V above ground, and inputs must remain ≥2.1V below V+ and ≥2.1V above V–. The barometer application in the datasheet demonstrates valid 5V single-supply use with LT1167IS8-1#PBF.

What is the minimum load resistance LT1167IS8-1#PBF can drive while maintaining specified accuracy?

The LT1167IS8-1#PBF maintains full accuracy (including 10ppm nonlinearity and 0.14% gain error) into loads ≥2kΩ across –40°C to +85°C. Driving lower impedances increases gain error and nonlinearity; for 600Ω loads, nonlinearity rises to 25ppm at G=100. Output swing remains ±10V into 10kΩ but compresses to ±8.5V into 2kΩ at ±15V supplies.

Does LT1167IS8-1#PBF require external capacitors for stability with capacitive loads?

No - the LT1167IS8-1#PBF is internally compensated to drive capacitive loads up to 1000pF in any gain configuration without external compensation. This eliminates stability risks in PCB traces, cable capacitance, or ADC input filtering. Overshoot remains <10% even with 10,000pF loads, though settling time increases beyond 1000pF.