INA101HP - Very High Accuracy Instrumentation Amp | TI
MPN: INA101HP β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.95 | $12.95 |
| 10 | $11.66 | $116.60 |
| 100 | $10.36 | $1,036.00 |
| 500 | $9.2 | $4,600.00 |
| 1,000 | $8.4 | $8,400.00 |
INA101HP Overview
An instrumentation amplifier is a specialized closed-loop differential amplifier designed to amplify low-level sensor signals while rejecting common-mode noise. Unlike a standard op amp, an instrumentation amplifier provides a precise gain set by a single external resistor, extremely high input impedance on both inputs, and a high common-mode rejection ratio (CMRR) without requiring tightly matched external resistor networks. In the signal-chain hierarchy it sits between the sensor front end and the ADC stage of a precision data acquisition system.
The INA101HP's headline features include low offset voltage of 25 uV max, low drift of 0.25 uV/C max, nonlinearity of 0.002% max, low input noise of 13 nV/sqrt(Hz), and very high input impedance of 10^10 ohm. These bipolar-architecture specifications were benchmark-setting when Burr-Brown introduced the family and remain competitive for DC-precision bridge applications.
The three-op-amp internal architecture places precision input buffers ahead of a difference amplifier, so source-impedance imbalance does not degrade CMRR, which reaches high values at 60 Hz. Gain is programmed from 1 V/V to over 1000 V/V with one external resistor RG, giving bandwidth up to approximately 300 kHz at low gains and 0.04 V/us slew rate.
Typical applications include strain-gauge bridge amplification, thermocouple and RTD temperature measurement, medical biopotential front ends such as ECG, and general-purpose low-level data acquisition where microvolt-level offsets cannot be tolerated.
Design consideration: gain accuracy and CMRR depend on careful layout and a clean, low-impedance reference pin; always return the REF pin to a low-impedance ground or driven reference rather than a resistor divider.
This page adds value beyond the manufacturer datasheet by consolidating drop-in alternative analysis, pricing context, design notes, and application guidance in one citable reference.
Drop-in alternatives for INA101HP β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with INA101HP (same form factor and footprint) β differing in Package, Bandwidth, Mounting Type, Architecture, Common-Mode Rejection.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
INA101KP
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
INA101HP-1
β Drop-Inπ Reference alternative (not in catalog)
INA101AG
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$50.01 / Unit
View Datasheet βINA101HP Maximum Ratings & Electrical Characteristics
| Amplifier Type | Instrumentation Amplifier |
| Number of Circuits | 1 |
| Offset Voltage (Max) | 25 uV |
| Offset Drift (Max) | 0.25 uV/C |
| Nonlinearity (Max) | 0.002% |
| Input Noise Density | 13 nV/Hz |
| Input Impedance | 10^10 ohm |
| Slew Rate | 0.04 V/us |
| Bandwidth | 300 kHz |
| Supply Voltage Range | +/-5 V to +/-20 V |
| Gain Range | 1 V/V to 1000 V/V (single resistor RG) |
| CMRR | High CMR at 60 Hz |
| Architecture | Bipolar, three-op-amp topology |
| Package | 14-PDIP (N), through-hole |
| Mounting Type | Through Hole |
INA101HP 14-pdip (n), through-hole Pin Configuration Guide
Pin configuration for INA101HP (14-pdip (n), through-hole 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 INA101HP.
Refer to the datasheet for full pin configuration.
Typical Applications
INA101HP is suitable for 6 applications: Strain-Gauge Bridge Amplification, Thermocouple Temperature Measurement, Industrial Data Acquisition Front End, Medical Biopotential Amplification (ECG/EEG), Weight Scale and Load Cell Systems, Legacy Test and Measurement Equipment Repair.
Strain-Gauge Bridge Amplification
The INA101HP fits strain-gauge bridge front ends because full-scale bridge outputs are typically only a few millivolts per volt of excitation, demanding microvolt-level offset (25 uV max) and drift (0.25 uV/C max) to preserve accuracy. The 10^10 ohm differential input impedance avoids loading the bridge arms, and source-impedance imbalance does not degrade CMRR thanks to the three-op-amp buffered architecture with high CMR at 60 Hz. In practice the bridge output connects directly to the inputs, gain is set to 100 or 1000 V/V with a single low-TC RG resistor, and the REF pin is returned to a low-impedance ground or offset-null reference. Unlike discrete op-amp instrumentation stages, no matched resistor network is required, eliminating a dominant error source.
Recommended
Thermocouple Temperature Measurement
Thermocouples generate roughly 40 uV/C of Seebeck signal, so amplifier offset and drift translate directly into temperature error. The INA101HP's 25 uV maximum offset corresponds to about 0.6 C equivalent for a type K thermocouple, and its 0.25 uV/C drift keeps ambient-induced error negligible across a measurement campaign. The 13 nV/Hz noise density preserves resolution when gain is set to several hundred V/V to match the thermocouple output to a 5 V ADC span. TI's datasheet includes a representative thermocouple amplifier circuit; cold-junction compensation is implemented at the input terminal block, and the amplifier's high input impedance accommodates the high source impedance of thin-gauge thermocouple wire without loading errors.
Recommended
Industrial Data Acquisition Front End
In industrial DAQ systems the INA101HP sits between field sensor terminations and the ADC, rejecting ground-potential differences and 50/60 Hz common-mode interference thanks to its high CMR at line frequency. Supply operation from +/-5 V to +/-20 V tolerates industrial rail conventions, and gain programmability from 1 to 1000 V/V via one resistor lets a single design cover pressure, load-cell, and RTD channels with different spans. The through-hole PDIP-14 package simplifies prototyping and field repair on legacy DIP-based I/O cards. Because the part draws no switching noise, unlike a PGA-based front end, downstream sigma-delta converters achieve cleaner noise floors; design the REF pin drive and input RC filters for the expected common-mode transients.
Recommended
Medical Biopotential Amplification (ECG/EEG)
Biopotential electrodes present kilohm-to-megohm source impedances and produce microvolt-to-millivolt signals riding on large common-mode mains interference, precisely the regime the INA101HP was designed for. Its 10^10 ohm input impedance minimizes electrode polarization loading, and high CMR at 60 Hz suppresses common-mode pickup before the signal reaches diagnostic filtering. Gain stages of 100 to 1000 V/V map ECG amplitudes to ADC ranges cleanly; series input resistors and clamp diodes provide defibrillation protection per applicable medical electrical safety requirements, which must be evaluated at system level. The bipolar input stage noise of 13 nV/Hz is adequate for ECG and standard EEG monitoring, though ultra-low-bias FET-input alternatives like the INA116 may suit microelectrode work better.
Recommended
Weight Scale and Load Cell Systems
Load cells share the same error budget mathematics as strain-gauge bridges: a 2 mV/V load cell excited at 10 V yields only 20 mV full scale, so 25 uV amplifier offset is 0.125% of span before gain, and 0.25 uV/C drift keeps zero-point wander negligible across warehouse temperature swings. The INA101HP drives its differential inputs straight from the load cell sense lines, sets gain to roughly 250 V/V with one RG resistor, and its buffered inputs tolerate the modest cable impedance of four-wire load cell wiring. The 300 kHz bandwidth is far beyond scale requirements, allowing aggressive output RC filtering (e.g., 10 Hz) for noise reduction without affecting signal fidelity. Return REF to ground or to a DAC-driven offset for tare adjustment.
Recommended
Legacy Test and Measurement Equipment Repair
The INA101HP is a workhorse replacement part for maintaining 1980s-2000s era bench instruments, data loggers, and DIP-socketed industrial controllers that specified the Burr-Brown INA101 by name. The through-hole PDIP-14 package mates directly with original sockets, and the pin-compatible INA101KP and INA101HP-1 variants cover accuracy and branding substitutions without layout changes. Because the gain equation G = 1 + 40 kOhm/RG has remained unchanged across the family, calibration resistors on the original PCB remain valid after replacement. Recommended practice: verify supply rails within +/-5 V to +/-20 V, inspect RG for drift-induced calibration error, and source the part from authorized distributors or reputable brokers with date-code verification given the part's long market life.
Recommended
Recommended Products Summary
Engineering reference data for INA101HP β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA101KP | INA101HP-1 | INA101AG |
|---|---|---|---|---|
| Package | 14-PDIP (N) | 14-PDIP (N) - same | 14-PDIP (N) - same | Ceramic DIP grade - same pin function map |
| Brand | Texas Instruments (Burr-Brown) | Texas Instruments | Texas Instruments (Burr-Brown marking) | Texas Instruments |
| Bandwidth | 300 kHz | 300 kHz | 300 kHz | 300 kHz |
| Supply Range | +/-5 V to +/-20 V | +/-5 V to +/-20 V | +/-5 V to +/-20 V | +/-5 V to +/-20 V |
Key Differentiators
- Industry-benchmark DC precision (vs INA105KP)
- Through-hole PDIP-14 for legacy socket compatibility (vs INA128)
- Trade-off: modest AC performance (vs INA821)
Design Notes
Return the REF pin to a low-impedance node. Driving REF from a resistor divider directly degrades CMRR because the divider impedance unbalances the internal difference amplifier; buffer the divider with an op amp (e.g., a precision op amp configured as a follower) or tie REF solidly to ground. Keep the RG gain resistor traces short and symmetric, and guard the high-impedance input traces to reduce leakage and noise pickup on the PDIP through-hole layout.
Supply the INA101HP from +/-5 V to +/-20 V dual rails with 0.1 uF ceramic decoupling capacitors placed close to each supply pin and returned to a clean analog ground. The device is not a rail-to-rail part: output swing is limited by headroom, so at +/-5 V supplies and low load impedance the usable output range is noticeably reduced. Verify the output can reach the ADC full-scale span under your load condition before fixing the gain resistor value.
Use a low temperature-coefficient (15 ppm/C or better) resistor for RG. Gain error from a generic 100 ppm/C resistor appears directly as span error, and at G = 1000 the RG value is only about 40 ohm, so switch and trace resistance become significant error terms - use 4-wire-worthy short, heavy traces for RG at high gains. Also confirm the substitute grade (HP vs KP vs HP-1) against your accuracy budget when replacing a socketed part.
Compliance Information
The legacy INA101HP datasheet predates RoHS-era documentation; compliance status must be confirmed from the TI product page or distributor RoHS certificate.
