INA101KU/1K - High Accuracy Instrumentation Amplifier | TI
MPN: INA101KU/1K β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $27.65 | $27.65 |
| 10 | $26.5 | $265.00 |
| 100 | $25.3 | $2,530.00 |
| 500 | $24.1 | $12,050.00 |
| 1,000 | $23 | $23,000.00 |
Drop-in alternatives for INA101KU/1K 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
β Drop-Inβ In Stock
$6.95 / Unit
View Datasheet βINA101KUE4
β Drop-Inπ Reference alternative (not in catalog)
AD524ARZ-16
β Drop-Inπ Reference alternative (not in catalog)
INA101KU/1K Maximum Ratings & Electrical Characteristics
| Amplifier Type | Instrumentation Amplifier |
| Number of Circuits | 1 |
| Input Offset Voltage | 25 uV max |
| Offset Voltage Drift | 0.25 uV/C max |
| Nonlinearity | 0.002% max |
| Input Noise Density | 13 nV/sqrt(Hz) |
| Common-Mode Rejection | High CMR at 60 Hz |
| Input Impedance | 10^10 ohms |
| Settling Time | 30 us |
| Supply Current | 10 mA |
| Package | 16-pin SOIC (DW) |
| Mounting Type | Surface Mount |
| Gain Setting | Single external resistor (RG) |
INA101KU/1K 16-pin soic (dw) Pin Configuration Guide
Complete pinout information for INA101KU/1K (16-pin soic (dw) 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/1K.
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/1K is suitable for 6 applications: Strain Gauge Bridge Amplification, Thermocouple Temperature Measurement, Industrial Process Control Signal Conditioning, Weigh Scale and Load Cell Systems, Medical Biopotential Acquisition, Data Acquisition and Test Instrumentation.
Strain Gauge Bridge Amplification
The INA101KU/1K is a natural fit for strain gauge and load-cell bridge front ends because bridges deliver only microvolt-level differential signals riding on large common-mode excitation voltages. Its 25 uV maximum input offset and 0.25 uV/C maximum drift keep the zero-balance error small even after temperature excursions, while 0.002% nonlinearity preserves the linearity of the bridge itself at gains of several hundred V/V. The 10^10 ohm input impedance prevents the amplifier from loading the bridge and distorting the transfer curve. In use, the bridge outputs connect directly to the in-amp inputs with a single external resistor setting the gain, and the high CMR at 60 Hz rejects mains pickup from nearby industrial equipment, delivering a clean single-ended signal to the ADC.
Recommended
Thermocouple Temperature Measurement
Type K and type J thermocouples produce roughly 41 uV/C and 52 uV/C respectively, so the front end must resolve microvolts without adding drift. The INA101KU/1K contributes only 25 uV maximum offset and 0.25 uV/C drift, which corresponds to a fraction of a degree of reading error after cold-junction compensation and calibration. The 13 nV/sqrt(Hz) input noise keeps the amplified signal clean at high gain, and high common-mode rejection at 60 Hz suppresses ground-loop and mains interference common in factory wiring. The device is wired as a fixed-gain differential stage between the thermocouple (with cold-junction sensor) and an ADC or V/F converter. Because the 10 mA supply current matters in multichannel racks, plan the thermal and power budget accordingly.
Recommended
Industrial Process Control Signal Conditioning
In process control systems, transmitters and sensors such as pressure bridges, RTDs, and pH probes generate small differential signals over long, noisy cable runs. The INA101KU/1K addresses this with high common-mode rejection at 60 Hz, 10^10 ohm input impedance that tolerates source imbalance, and 0.002% maximum nonlinearity that preserves measurement linearity across the control range. Its 25 uV offset allows spanning full-scale with gains above 500 V/V while remaining within accuracy targets. The amplifier is placed at the receiving end of 4-20 mA shunt or direct differential sensor lines, with RC input filtering ahead of the pins for EMI. The 16-pin SOIC (DW) surface-mount package supports automated assembly in industrial control boards, and the single-resistor gain adjustment simplifies range calibration during production.
Recommended
Weigh Scale and Load Cell Systems
Load cells used in weigh scales output on the order of 2 mV/V full scale, so at 10 V excitation the usable signal is about 20 mV - and individual resolution steps can be a few microvolts. The INA101KU/1K's 25 uV max offset and 0.25 uV/C drift let designers set high gain without unacceptable zero drift, and 13 nV/sqrt(Hz) noise preserves count resolution near the scale's legal-for-trade accuracy limits. The very high 10^10 ohm input impedance avoids loading errors from cable and bridge resistance tolerances. The amplifier sits between the load cell connector and the delta-sigma ADC, with a low-pass RC filter for 50/60 Hz rejection complementing the in-amp's CMR. Its SOIC-16 footprint and single-resistor gain scaling fit compact retail scale PCBs.
Recommended
Medical Biopotential Acquisition
ECG and EEG front ends must extract microvolt-level biopotentials from bodies that float tens of millivolts to volts on mains-induced common-mode voltage. The INA101KU/1K's high common-mode rejection at 60 Hz, 13 nV/sqrt(Hz) low noise, and 10^10 ohm input impedance make it suitable for such acquisition front ends: electrodes connect through protection and filtering networks to the in-amp inputs, and the single external resistor sets gain in the hundreds of V/V. The 25 uV offset ensures baseline stability between electrode pairs. Designers should pair it with a driven-right-leg auxiliary amplifier to actively cancel common-mode voltage, add high-input-impedance input protection for defibrillation surge requirements, and verify all applicable medical electrical safety standards on the finished instrument.
Recommended
Data Acquisition and Test Instrumentation
General-purpose data acquisition and bench instrumentation require a front end that is accurate, linear, and tolerant of common-mode ground differences between the source and the instrument. The INA101KU/1K provides 0.002% maximum nonlinearity and 25 uV offset, so it adds minimal error to a 12- to 16-bit digitizer chain, and its high CMR at 60 Hz rejects ground-loop hum between rack equipment. Programmable range switching is supported by reconfiguring the gain resistor with a relay or analog switch, using the single-resistor gain scheme. The 30 us settling time defines the channel-switch rate in multiplexed systems, so designers should allow settling time margin before each conversion. The SOIC-16 surface-mount package integrates cleanly into PCIE-sized DAQ boards.
Recommended
Recommended Products Summary
Engineering reference data for INA101KU/1K β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA101KU | INA101KUE4 | AD524ARZ-16 |
|---|---|---|---|---|
| Package | 16-SOIC (DW) | 16-SOIC (DW) - same | 16-SOIC (DW) - same | 16-SOIC - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Input Offset Voltage (max) | 25 uV | 25 uV | 25 uV | [DATA_NEEDED] |
| Offset Drift (max) | 0.25 uV/C | 0.25 uV/C | 0.25 uV/C | [DATA_NEEDED] |
| Nonlinearity (max) | 0.002% | 0.002% | 0.002% | [DATA_NEEDED] |
| Input Noise | 13 nV/sqrt(Hz) | 13 nV/sqrt(Hz) | 13 nV/sqrt(Hz) | [DATA_NEEDED] |
| Input Impedance | 10^10 ohms | 10^10 ohms | 10^10 ohms | [DATA_NEEDED] |
| Supply Current | 10 mA | 10 mA | 10 mA | [DATA_NEEDED] |
| CMR at 60 Hz | High CMR at 60 Hz | High CMR at 60 Hz | High CMR at 60 Hz | [DATA_NEEDED] |
| Pin-to-Pin Drop-In | - | Yes (same die) | Yes (same die) | Verify pin map against datasheet |
Key Differentiators
- Ultra-low offset drift preserves accuracy without trimming (vs AD524ARZ-16)
- Extremely high input impedance eliminates source loading (vs INA101AG)
- 0.002% nonlinearity protects system linearity at high gain (vs Discrete three-op-amp front end)
Design Notes
The INA101KU/1K achieves its rated high CMR at 60 Hz only if both input paths are balanced. Match the series resistors and filter capacitors at pins for -IN and +IN to within 0.1%, and route both input traces symmetrically away from switching nodes. Any imbalance converts common-mode mains hum into a differential error that no amount of amplifier CMR can remove. Keep the gain resistor (RG) traces short and away from the input traces to avoid leakage and crosstalk.
Use a guard ring driven at the input common-mode potential around the high-impedance input pins to protect the 10^10 ohm input impedance from PCB leakage currents, especially in high-humidity environments. Place a 100 nF ceramic decoupling capacitor within 2 mm of each supply pin, plus a 10 uF bulk capacitor per board. A solid ground plane under the SOIC-16 (DW) package lowers return-path impedance; keep the analog ground return for the REF pin separate until a single star point.
Do not rely on the amplifier alone to fix a poor bridge: with 25 uV max offset and 0.25 uV/C drift, a gain of 500 V/V means up to 12.5 mV of output zero error, so budget for system calibration or use resistors with 0.1% tolerance for RG to control gain error. Also remember the 10 mA supply current per channel when designing multichannel or battery-powered instruments, and verify the REF pin is driven from a low-impedance source, not a resistor divider, to preserve CMR.
In multiplexed data acquisition systems, the 30 us settling time of the INA101KU/1K defines the maximum channel-switch rate. Allow at least 5 time constants of RC settling on the input filter plus the in-amp settling time before starting each ADC conversion. If faster scan rates are required, reduce the input filter bandwidth or consider a newer-generation in-amp with faster settling, accepting a PCB redesign trade-off.
Compliance Information
Compliance status not stated in the provided verified web data; confirm RoHS/REACH status on the official TI product page at ti.com/product/INA101 before ordering.
