Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Gain Range | 1 V/V to 10,000 V/V with one external resistor |
| Offset Voltage | 50 µV maximum |
| Offset Drift | 0.5 µV/°C maximum |
| Input Bias Current | 5 nA maximum |
| Common-Mode Rejection | 110 dB minimum at high gain stated feature |
| Supply | ±2.25 V to ±18 V |
| Input Protection | Inputs protected to ±40 V |
| Exact Package / Packing | SOIC (D), 8 pins; 2500-piece large tape and reel |
Product Overview
INA118U/2K5 is a precision, low-power instrumentation amplifier for low-level differential signals that need high gain and strong common-mode rejection. A single resistor sets gain from 1 to 10,000, while the input stage includes protection for voltages up to ±40 V.
Its 350 µA quiescent current is modest for a wide-supply precision amplifier, but bandwidth falls as gain rises; TI cites about 70 kHz at a gain of 100. That makes INA118 better suited to precision sensor and slowly varying acquisition than to the very high-speed front ends served by newer wideband instrumentation amplifiers.
The exact /2K5 order code is the 2500-piece large tape-and-reel SOIC version. Its leaded SOIC package is easy to inspect and rework and can be attractive in industrial analog boards where assembly robustness matters more than minimum PCB area.
For related devices, see HKEQGOO’s Instrumentation Amplifiers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | INA118U/2K5 |
| Gain Range | 1 V/V to 10,000 V/V with one external resistor |
| Offset Voltage | 50 µV maximum |
| Offset Drift | 0.5 µV/°C maximum |
| Input Bias Current | 5 nA maximum |
| Common-Mode Rejection | 110 dB minimum at high gain stated feature |
| Supply | ±2.25 V to ±18 V |
| Input Protection | Inputs protected to ±40 V |
| Exact Package / Packing | SOIC (D), 8 pins; 2500-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | INA 118U |
Functional Highlights
High gain and low drift favor small sensor signals
The combination of 50 µV maximum offset, 0.5 µV/°C drift and gain up to 10,000 allows bridge or transducer signals to be amplified before a downstream ADC. External RG tolerance and drift become increasingly important as gain rises.
Input protection is useful but does not replace system protection
The ±40 V protected inputs improve survivability of abnormal sensor/common-mode conditions. Source impedance, fault duration and absolute supply/reference behavior still need to be considered in a complete front end.
Design Considerations
- Choose RG tolerance and temperature coefficient for the required gain accuracy.
- Check gain-dependent bandwidth before using INA118 in fast transient acquisition.
- Drive REF from a low-impedance source because reference error appears directly at the output.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists INA118U/2K5 as Active / Production; SOIC (D), 8 pins; 2500-piece large tape and reel; Level-3-260C-168 HR; marking INA 118U.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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