Texas Instruments INA106U

Overview

INA106U from Texas Instruments is a monolithic precision gain = 10 differential amplifier with 86dB minimum CMRR, 0.025% maximum gain error, and 0.5MHz typical bandwidth. It integrates laser-trimmed metal-film resistors and a precision op amp for high-accuracy signal conditioning in battery test systems and servo feedback loops.

For engineers reviewing the INA106U datasheet, INA106U pinout, INA106U application, or INA106U equivalent, key selection criteria include its fixed gain configuration, ±5V to ±18V dual-supply operation, 200μV max offset voltage, and SOIC-8 package compatibility with industrial analog signal chains.

Technical Context

The INA106U implements a fully integrated difference amplifier topology using four on-chip laser-trimmed resistors (10kΩ/100kΩ pairs) matched for ratio accuracy and TCR tracking. Its internal architecture eliminates external resistor matching requirements while maintaining 86dB CMRR over temperature.

It operates in a single functional mode with rail-to-rail output swing capability under ±15V supply, delivering 2V/µs typical slew rate and 5µs 0.1% settling time for 10V step inputs. Input common-mode range extends to ±11V with 10kΩ differential and 110kΩ common-mode input impedance.

Key Specifications

Pinout & Package

The INA106U is housed in an 8-pin SOIC surface-mount package (4.9 mm × 6 mm), RoHS-compliant, with moisture sensitivity level (MSL) not applicable for this package type.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA106U, INA105U offers higher baseline CMRR but shifts gain-setting burden to external components, while INA117P delivers exceptional CMRR in through-hole form but sacrifices surface-mount flexibility and increases BOM count.

Availability

INA106U is available at Aetrix Electronics and suitable for battery test equipment, servo drive feedback systems, industrial level transmitters, and solar string inverters requiring stable component supply across extended production lifecycles.

Supply support for INA106U 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in precision analog ICs.

The INA106U belongs to TI's precision instrumentation amplifier product line, engineered specifically for high-accuracy, low-drift differential signal conditioning in industrial test and control systems.

FAQ

What is the maximum operating temperature range for the INA106U?

The INA106U is specified for operation from –40°C to +85°C ambient temperature. Its internal architecture maintains 86dB minimum CMRR and 0.025% maximum gain error across this full range, supported by 4ppm/°C typical gain drift and 0.2μV/°C offset voltage drift. The device's thermal resistance (74.1°C/W for SOIC) allows reliable operation in sealed industrial enclosures without forced air cooling when mounted on 2-oz copper PCBs.

Does the INA106U require external resistors to achieve gain = 10?

No, the INA106U does not require external resistors to achieve gain = 10. It integrates four laser-trimmed on-chip metal-film resistors (two 10kΩ and two 100kΩ) configured in a precision difference amplifier topology. This monolithic implementation eliminates external resistor matching requirements and ensures guaranteed 0.025% maximum gain error and 86dB minimum CMRR without user calibration or trimming.

Can the INA106U operate from a single supply?

Yes, the INA106U can operate from a single supply, with recommended input voltage range of 10V to 36V. When used in single-supply mode, the REF pin must be biased to establish proper output common-mode voltage, and input signals must remain within the specified common-mode range (0V to V_S – 3V). Performance parameters such as output swing and CMRR are optimized for dual-supply operation (±5V to ±18V), but validated functionality is maintained across the full single-supply range.

What is the purpose of the SENSE pin on the INA106U?

On the INA106U, the SENSE pin (Pin 5) connects to a 100kΩ on-chip resistor that forms part of the internal gain-setting network. It works in conjunction with the REF pin to enable precise offset trimming and output level translation. Applying a voltage to REF sums directly with the amplified differential output, while SENSE provides the complementary path needed to maintain resistor ratio integrity-ensuring that gain accuracy and CMRR are preserved even during offset adjustment.

How does the INA106U compare to discrete op-amp + resistor solutions?

The INA106U replaces discrete op-amp + four-resistor difference amplifier designs with a monolithic solution offering guaranteed 0.025% gain error, 86dB CMRR, and 4ppm/°C gain drift. Discrete implementations typically require 0.01% tolerance resistors with <5ppm/°C TCR matching to approach similar performance-increasing cost, board area, and assembly complexity. The INA106U's on-die resistor matching eliminates these variables while reducing layout sensitivity to parasitic capacitance and trace length mismatches.