Analog Devices Inc. LT1167IS8#TRPBF

Overview

LT1167IS8#TRPBF from Analog Devices (acquired Linear Technology) is a precision instrumentation amplifier requiring only one external resistor to set gains from 1 to 10,000. It delivers 7.5 nV/√Hz input voltage noise at 1 kHz, 0.3 μV/°C max input offset drift, and 90 dB CMRR at G = 1 - optimized for bridge sensor signal conditioning in industrial and medical instrumentation operating across –40°C to +85°C.

For engineers reviewing the LT1167IS8#TRPBF datasheet, LT1167IS8#TRPBF pinout, LT1167IS8#TRPBF application, or LT1167IS8#TRPBF equivalent, this page provides verified gain-setting behavior, thermal stability data, ESD robustness (13 kV HBM), IEC 1000-4-2 Level 4 compliance with two 5 kΩ resistors, and SO-8 package layout guidance for low-drift analog front-ends.

Technical Context

The LT1167IS8#TRPBF implements a three-op-amp architecture with laser-trimmed 24.7 kΩ internal resistors and superbeta NPN input transistors, enabling picoampere bias current (350 pA max) and precise gain accuracy via single external RG resistor. Its transconductance-scaling preamp stage maintains bandwidth independence from gain scaling - delivering 1 MHz BW at G = 1 and 12 kHz at G = 1000.

It features a fully differential input stage referenced to an externally adjustable REF pin, supporting single-supply operation when REF is tied to V–, provided inputs remain ≥2.5 V above ground. Input common-mode range extends to within 1.9 V of either rail (±2.3 V to ±18 V supplies), and output swing reaches within 1.3 V of rails into 10 kΩ loads.

Key Specifications

Pinout & Package

LT1167IS8#TRPBF is housed in an 8-lead plastic SO (S8) package, RoHS-compliant and lead-free, with θ_JA = 190°C/W. Pin 1 is marked with a dot; pin numbering follows standard SOIC convention.

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#TRPBF uniquely balances low drift (0.3 μV/°C), IEC 1000-4-2 Level 4 compliance, and single-resistor gain programming - making it optimal for cost-sensitive, thermally stable industrial sensor interfaces where layout reuse and regulatory certification matter.

Availability

LT1167IS8#TRPBF is available at Aetrix Electronics and suitable for strain gauge amplifiers, thermocouple interfaces, medical sensor front-ends, and industrial process monitors requiring stable component supply across extended temperature ranges.

Supply support for LT1167IS8#TRPBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LT1167 product line was originally developed by Linear Technology (acquired by ADI in 2017) to deliver precision, low-drift instrumentation amplifiers for sensor signal conditioning in harsh environments - emphasizing laser-trimmed accuracy, ESD robustness, and simplified gain configuration.

FAQ

What is the maximum gain achievable with LT1167IS8#TRPBF and how is it set?

The LT1167IS8#TRPBF 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 + 49.4 kΩ/RG; for G = 10,000, RG = 4.94 Ω. At high gains, bandwidth reduces to 12 kHz (G = 1000), but input-referred noise remains dominated by the input transistors.

Does LT1167IS8#TRPBF support single-supply operation?

Yes, LT1167IS8#TRPBF supports single-supply operation when the REF pin (Pin 5) is tied to the negative supply rail (Pin 4). This requires both inputs to remain ≥2.5 V above ground - a condition met in barometer and bridge applications where excitation bias lifts common-mode voltage.

What is the guaranteed input offset voltage specification for LT1167IS8#TRPBF over temperature?

For the I-grade LT1167IS8#TRPBF (–40°C to +85°C), the input offset voltage is guaranteed ≤75 μV max over the full temperature range. At 25°C, typical is 20 μV, and drift is specified at 0.3 μV/°C max - ensuring predictable DC error accumulation in closed-loop systems.

Can LT1167IS8#TRPBF drive ADC input filters directly?

Yes, LT1167IS8#TRPBF is stable driving capacitive loads up to 1000 pF in any gain configuration. This allows direct connection to RC anti-aliasing filters before SAR or sigma-delta ADCs without buffer stages - reducing component count and board area in compact sensor modules.

How does LT1167IS8#TRPBF achieve IEC 1000-4-2 Level 4 ESD compliance?

LT1167IS8#TRPBF achieves IEC 1000-4-2 Level 4 (8 kV contact / 15 kV air) when two 5 kΩ resistors are placed in series with each input (–IN and +IN) to limit transient current. This configuration is validated in the datasheet and leverages the device's inherent 13 kV HBM robustness without additional protection components.