INA101KU - High Accuracy Instrumentation Amp | Texas Instruments
MPN: INA101KU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.95 | $89.50 |
| 100 | $8.2 | $820.00 |
| 500 | $7.6 | $3,800.00 |
| 1,000 | $6.95 | $6,950.00 |
Drop-in alternatives for INA101KU β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
INA101KU/1K
β Drop-Inβ In Stock
$23 / Unit
View Datasheet βAD524ARZ-16
β Drop-Inπ Reference alternative (not in catalog)
INA103KU
β Drop-Inπ Reference alternative (not in catalog)
INA101KU Maximum Ratings & Electrical Characteristics
| Amplifier Type | Instrumentation Amplifier |
| Number of Circuits | 1 |
| Internal Topology | 3-amplifier (three op amp) architecture |
| Input Offset Voltage | 25 uV max |
| Offset Voltage Drift | 0.25 uV/C max |
| Nonlinearity | 0.002% max |
| Input Voltage Noise | 13 nV/Hz |
| Common-Mode Rejection | High CMR at 60 Hz |
| Input Impedance | 10^10 ohm |
| Supply Voltage Range | +/-5 V to +/-20 V |
| Slew Rate | 0.4 V/uS |
| Bandwidth | 25 kHz |
| Gain Setting | Single external resistor RG |
| Package | 16-SOIC (DW / SOL-16) |
| Mounting Type | Surface Mount |
INA101KU 16-soic (dw / sol-16) Pin Configuration Guide
Complete pinout information for INA101KU (16-soic (dw / sol-16) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for INA101KU.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
INA101KU is suitable for 6 applications: Strain Gage Bridge Amplifier, Thermocouple and RTD Conditioning, Weigh Scales and Load Cells, Precision Data Acquisition Front End, Medical Transducer Interfaces, Industrial Process Signal Conditioning.
Strain Gage Bridge Amplifier
The INA101KU is a primary recommended amplifier for strain-gage bridge readout. Metal-foil strain gage bridges produce full-scale outputs of only a few millivolts per volt of excitation, and the INA101KU's 25 uV max offset, 0.25 uV/C drift, and 0.002% nonlinearity preserve those microvolt signals without manual calibration. Its 10^10 ohm input impedance prevents bridge loading, and high CMR at 60 Hz rejects mains pickup on long bridge wiring. Place the amplifier close to the bridge, use a low-TCR gain resistor, and add RFI filtering on the inputs; the 13 nV/Hz noise supports resolution of microvolt-level bridge changes in weigh scales and structural load monitoring.
Recommended
Thermocouple and RTD Conditioning
Thermocouples generate tens of microvolts per degree C, so amplifier offset and drift directly become temperature error. The INA101KU's 25 uV max offset and 0.25 uV/C max drift make it well suited to thermocouple front ends where a cold-junction-compensated signal is amplified at moderate gain. Its high input impedance allows large input filter resistors for burnout detection and RFI rejection without introducing significant offset error from bias current. In RTD bridge configurations, the 0.002% nonlinearity preserves measurement integrity across the span. Set gain with a single low-drift resistor; digitize the output with a precision ADC such as the CS5532 for a complete low-level analog front end.
Recommended
Weigh Scales and Load Cells
Load cells are strain-gage bridges excited at 5-10 V, producing 2 mV/V full scale. The INA101KU amplifies this with sufficient accuracy for commercial weighing: 0.002% nonlinearity supports high count-per-division resolution, and the 25 uV offset keeps zero-balance error negligible relative to a 10-20 mV full-scale signal. The 25 kHz bandwidth is far beyond mechanical settling time of the load cell, so the amplifier does not limit response. High CMR at 60 Hz counters mains interference from nearby powered equipment. Combine with a precision excitation reference and a delta-sigma ADC with ratiometric measurement to cancel excitation drift entirely.
Recommended
Precision Data Acquisition Front End
In multi-channel industrial data acquisition, low-level transducer signals travel long distances to the digitizer. The INA101KU serves as the per-channel differential front end: its 10^10 ohm inputs permit anti-alias and RCI filter networks, high CMR suppresses ground-potential differences and 50/60 Hz pickup, and DC accuracy of 25 uV offset with 0.002% nonlinearity preserves system-level accuracy over +/-5 V to +/-20 V supplies. The 0.4 V/uS slew rate and 25 kHz bandwidth suit low-frequency industrial monitoring. Program per-channel gain with a single resistor or a relay/mux-selected gain resistor bank for programmable-gain front ends feeding multiplexed ADCs.
Recommended
Medical Transducer Interfaces
Medical sensors such as pressure transducers and bio-potential bridge sensors demand high accuracy, high input impedance, and strong mains rejection. The INA101KU's 10^10 ohm input impedance avoids loading high-impedance electrodes and transducers, its 13 nV/Hz noise floor resolves microvolt signals, and high CMR at 60 Hz suppresses power-line interference critical in patient-connected equipment. Designers must comply with applicable patient-isolation standards by placing the amplifier inside the isolated section, using isolated power and isolated data coupling downstream. Verify regulatory requirements for the end equipment; the datasheet explicitly disclaims life-support use without additional qualification.
Recommended
Industrial Process Signal Conditioning
Process transducers (pressure, flow, level) frequently output millivolt-level differential signals riding on large common-mode voltages in electrically noisy plants. The INA101KU amplifies these differentially with high CMR at 60 Hz, rejecting ground-loop and mains interference, and its wide +/-20 V supply range accommodates rugged industrial analog rails. Its very high input impedance supports protective input networks with series resistors and clamps without degrading accuracy. The part's 0.002% nonlinearity maintains calibration over the process span, reducing recalibration intervals. Follow with an ADC or a voltage-to-current converter for 4-20 mA transmission to the control room.
Recommended
Recommended Products Summary
Engineering reference data for INA101KU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA101KU/1K | AD524ARZ-16 | INA103KU |
|---|---|---|---|---|
| Package | 16-SOIC (DW / SOL-16) | 16-SOIC (DW) - same | 16-SOIC - same | 16-SOIC (DW) - same |
| Brand | Texas Instruments | Texas Instruments | Analog Devices | Texas Instruments |
| Input Offset Voltage | 25 uV max | 25 uV max | [DATA_NEEDED] | [DATA_NEEDED] |
| Offset Drift | 0.25 uV/C max | 0.25 uV/C max | [DATA_NEEDED] | [DATA_NEEDED] |
| Nonlinearity | 0.002% max | 0.002% max | [DATA_NEEDED] | [DATA_NEEDED] |
| Input Noise | 13 nV/Hz | 13 nV/Hz | [DATA_NEEDED] | [DATA_NEEDED] (optimized for low noise) |
| Supply Voltage | +/-5 V to +/-20 V | +/-5 V to +/-20 V | [DATA_NEEDED] | [DATA_NEEDED] |
| Bandwidth / Slew Rate | 25 kHz / 0.4 V/uS | 25 kHz / 0.4 V/uS | [DATA_NEEDED] | [DATA_NEEDED] |
| Packaging Suffix | Tube (single ordering unit) | 1000-unit tape and reel | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Very high DC accuracy for bridge readout (vs INA103KU)
- Low input noise for microvolt signals (vs AD524ARZ-16)
- High input impedance without bridge loading (vs INA117KU)
Design Notes
Route the gain-setting resistor RG with the shortest possible traces and use a low-TCR (e.g., 25 ppm/C or better) precision resistor. In the classic three-amp topology, RG drop defines gain, so any RG self-heating or thermal EMF in its connections appears directly as gain error and output drift - especially damaging at high gains where RG values are small. Keep the RG node away from switching or digital traces and guard it if the board carries microvolt-level signals.
With 10^10 ohm input impedance and 13 nV/Hz noise, input network resistance contributes both offset and noise. Estimated: 10 kOhm of series input resistance with typical bias current can add measurable offset error, and resistor thermal noise of 1 kOhm is about 4 nV/Hz - comparable to the amplifier noise floor. Keep input series resistors under a few kOhm unless filtering demands otherwise, and prefer differential RC filters matched between the two inputs so common-mode filtering stays balanced.
For transducer wiring longer than a few meters in industrial environments, add RFI input filtering (small series resistors plus capacitors to ground at each input, before the amplifier pins) because RF rectification at the input stage can appear as DC offset shift. The high CMR at 60 Hz rejects mains pickup differentially, but only if the source impedances seen by both inputs are balanced - mismatched filter resistors convert common-mode hum into differential error.
The INA101KU runs from +/-5 V to +/-20 V dual rails. Decouple both supplies with 0.1 uF ceramics placed close to the supply pins, plus bulk capacitance per board. Note that with +/-20 V rails the device can dissipate significant power at high output current into light loads; verify junction temperature for your worst-case supply and load combination using the SOIC-16 thermal data in the manufacturer datasheet.
Compliance Information
Compliance status varies by ordering suffix within the legacy INA101 family. Verify RoHS/REACH status for the exact INA101KU suffix on the official TI product page (ti.com/product/INA101) environmental data section.
