Analog Devices Inc. LT1167AIS8#PBF

Overview

LT1167AIS8#PBF from Analog Devices (formerly Linear Technology) is a precision instrumentation amplifier requiring only one external resistor to set gain 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, enabling high-accuracy bridge sensor conditioning in industrial pressure transducers and medical instrumentation.

For engineers reviewing the LT1167AIS8#PBF datasheet, LT1167AIS8#PBF pinout, LT1167AIS8#PBF application, or LT1167AIS8#PBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, laser-trimmed 40 μV max input offset voltage, single-resistor gain programming, and IEC 1000-4-2 Level 4 ESD compliance with two 5 kΩ resistors.

Technical Context

The LT1167AIS8#PBF implements a three-op-amp instrumentation architecture with laser-trimmed 24.7 kΩ internal resistors and matched NPN input transistors. Its gain equation G = 1 + (49.4 kΩ / RG) enables precise, stable gain setting across temperature via a single external resistor.

It features superbeta processing for 350 pA max input bias current, differential input capacitance of 1.6 pF, and reference-input impedance of 20 kΩ. The output drives capacitive loads up to 1000 pF without instability while maintaining 0.75 V/μs min slew rate and 1000 kHz bandwidth at G = 1.

Key Specifications

Pinout & Package

LT1167AIS8#PBF is housed in an 8-lead plastic SOIC (S8) package with JEDEC MS-012AC footprint, 1.27 mm pitch, and 5.0 mm × 4.0 mm body size. Thermal resistance θ_JA = 190°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8421ARZ and INA128UA, LT1167AIS8#PBF uniquely combines guaranteed –40°C to +85°C performance, single-resistor gain programming up to 10,000×, and integrated REF pin - making it optimal for calibrated, wide-temperature industrial and medical front-ends where layout simplicity and drift stability are critical.

Availability

LT1167AIS8#PBF is available at Aetrix Electronics and suitable for industrial pressure transducers, medical patient monitors, and automotive cabin climate sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LT1167AIS8#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, 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 developed by Linear Technology (acquired by ADI in 2017) to deliver precision, low-power instrumentation amplifiers for sensor signal conditioning - emphasizing laser-trimmed accuracy, single-resistor gain flexibility, and robust ESD protection for real-world industrial deployments.

FAQ

What is the maximum gain achievable with LT1167AIS8#PBF and how is it set?

The LT1167AIS8#PBF supports a maximum gain of 10,000, set by connecting a 4.94 Ω external resistor between pins 1 and 8 (RG). This follows the gain equation G = 1 + (49.4 kΩ / RG). At G = 10,000, the LT1167AIS8#PBF maintains 20 ppm gain nonlinearity and 0.16% max gain error over –40°C to +85°C, verified per the manufacturer's electrical characteristics table.

Does LT1167AIS8#PBF require external offset trimming in typical applications?

No, the LT1167AIS8#PBF does not require external offset trimming in typical applications. It is laser-trimmed to achieve ≤40 μV max input offset voltage and ≤0.3 μV/°C drift over temperature. The datasheet explicitly states "no external offset trimming is required for most applications," and the optional trimming circuit shown in Figure 2 is provided only for cases demanding tighter offset control than the factory specification.

Can LT1167AIS8#PBF operate from a single 5 V supply?

Yes, the LT1167AIS8#PBF can operate from a single 5 V supply. Per the Absolute Maximum Ratings and Electrical Characteristics tables, its minimum total supply voltage is ±2.3 V (i.e., 4.6 V), and the output swing is specified down to –VS + 1.4 V and +VS – 1.3 V. With V+ = 5 V and V– = 0 V, the output swings from ≈1.4 V to ≈3.7 V, and the REF pin may be tied to 2.5 V to center the output - confirmed in the Single Supply Operation section.

What is the purpose of the dual RG pins (1 and 8) on LT1167AIS8#PBF?

Pins 1 and 8 on the LT1167AIS8#PBF are internally connected and serve as the two terminals of the gain-set resistor RG. This Kelvin connection minimizes errors from PCB trace resistance and solder joint variations - especially critical at high gains where RG values drop below 100 Ω. Using both pins ensures the full current through RG is sensed, preserving gain accuracy per the equation G = 1 + (49.4 kΩ / RG).

How does LT1167AIS8#PBF meet IEC 1000-4-2 Level 4 ESD requirements?

The LT1167AIS8#PBF meets IEC 1000-4-2 Level 4 (8 kV contact / 15 kV air) when two external 5 kΩ resistors are placed in series with the +IN and –IN pins, as documented in the Applications section and Absolute Maximum Ratings. These resistors limit peak current during ESD events, allowing the internal 13 kV HBM-rated inputs to survive without latch-up or parametric shift - a configuration validated by Linear Technology and repeated in customer reference designs.