INA101AG - High Accuracy Instrumentation Amplifier | TI
MPN: INA101AG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $50.01 | $50.01 |
| 10 | $50.01 | $500.10 |
| 100 | $50.01 | $5,001.00 |
| 500 | $50.01 | $25,005.00 |
| 1,000 | $50.01 | $50,010.00 |
INA101AG Overview
An instrumentation amplifier is a specialized precision voltage amplifier in the analog signal chain hierarchy: it sits above the general-purpose op-amp as a closed-loop, gain-set device designed to extract microvolt-level differential signals riding on large common-mode voltages. Unlike a standard op-amp, an in-amp uses an internal resistor network so gain can be set with a single external resistor while preserving high common-mode rejection, making it the standard front end for sensor interfaces.
Key features include 0.002% maximum nonlinearity, 13 nV/rtHz low input noise, 106 dB CMR at 60 Hz, and 10^10 ohm input impedance. These specifications mean bridge transducer signals can be amplified without loading the sensor or corrupting the measurement with noise, and drift remains low across the industrial temperature range.
Technically, the INA101 integrates three precision op amps and laser-trimmed metal-film resistors on a single monolithic die. The laser trim during manufacturing establishes the tight offset, drift, and gain accuracy without external calibration. The device operates from dual supplies of +/-5V to +/-20V, offering flexibility for industrial analog rails, with a 300 kHz bandwidth and 0.04 V/us slew rate suited to low-frequency precision signals rather than fast waveforms.
Typical applications include strain gage bridge amplifiers, thermocouple and RTD temperature measurement front ends, and remote sensor signal conditioning where long cable runs demand high input impedance and strong common-mode rejection. The CDIP ceramic package suits military and industrial environments with elevated temperatures.
Design consideration: gain is set by a single external resistor RG; keep RG leads short and use precision resistors, because trace resistance and thermal EMFs directly degrade the laser-trimmed accuracy. Note the 300 kHz bandwidth limits use to low-speed measurements.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for INA101AG — 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 INA101AG (same form factor and footprint) — differing in Package, Bandwidth, Mounting Type, Architecture, Common-Mode Rejection.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
INA101HP
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$8.4 / Unit
View Datasheet →INA101KP
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
INA101SG
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$9.45 / Unit
View Datasheet →INA101AG Maximum Ratings & Electrical Characteristics
| Amplifier Type | Instrumentation Amplifier |
| Number of Channels | 1 |
| Input Offset Voltage (max) | 25 uV |
| Offset Drift (max) | 0.25 uV/C |
| Nonlinearity (max) | 0.002% |
| Input Noise Density | 13 nV/rtHz |
| Common-Mode Rejection | 106 dB at 60 Hz |
| Input Impedance | 10^10 ohm |
| Bandwidth | 300 kHz |
| Slew Rate | 0.04 V/us |
| Supply Voltage Range | +/-5 V to +/-20 V |
| Package | 14-CDIP (0.300", 7.62 mm) |
| Mounting Type | Through Hole |
| Architecture | Three-op-amp, laser-trimmed metal-film resistors |
| Applications | Strain gages, thermocouples, RTDs, remote transducers |
INA101AG 14-cdip (0.300", 7.62 mm) Pin Configuration Guide
Pin configuration for INA101AG (14-cdip (0.300", 7.62 mm) 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 INA101AG.
Refer to the datasheet for full pin configuration.
Typical Applications
INA101AG is suitable for 6 applications: Strain Gage Bridge Amplifier, Thermocouple Measurement Front End, RTD Temperature Signal Conditioning, Remote Transducer / Industrial Data Acquisition, Medical / Biomedical Signal Amplification, Legacy Military / Aerospace Sustaining Designs.
Strain Gage Bridge Amplifier
The INA101AG is explicitly listed by TI for strain gage amplification. A Wheatstone bridge outputs microvolt-per-volt sensitivity, and the INA101AG's 25 uV max offset and 0.25 uV/C drift preserve bridge resolution without periodic recalibration. Its 10^10 ohm input impedance prevents loading of high-output-impedance bridges, while 106 dB CMR at 60 Hz rejects excitation common-mode and mains pickup on cable runs. Gain is set with one external resistor RG; with 300 kHz bandwidth, dynamic strain up to tens of kHz is covered. Placed directly at the bridge, the in-amp converts the differential bridge signal to a ground-referenced output for an ADC or filter stage.
Recommended
Thermocouple Measurement Front End
Thermocouples generate roughly 40 uV/C, so amplifier offset and drift dominate measurement error. The INA101AG's 25 uV max offset corresponds to under 1 C equivalent error, and 0.25 uV/C drift adds negligible error over ambient swings. The 13 nV/rtHz noise keeps resolution loss minimal over typical thermocouple bandwidths of a few Hz to a few hundred Hz. High 10^10 ohm input impedance supports differential connection with protection resistors and RC filtering without introducing gain error. Set gain to approximately 100 to 500 to map a K-type or J-type span onto a 0-5V ADC range, and provide cold-junction compensation with a precision sensor at the connector block.
Recommended
RTD Temperature Signal Conditioning
RTDs are typically excited with a small constant current (1 mA or less) and read differentially; the resultant millivolt-level signals ride on large common-mode excitation voltage. The INA101AG's 106 dB CMR at 60 Hz suppresses this common-mode component and line interference, while 0.002% max nonlinearity preserves the ratiometric accuracy of a 3-wire or 4-wire RTD hookup. The 10^10 ohm input impedance eliminates lead-resistance loading in high-impedance 3-wire circuits. With gain of about 100 and a 100-ohm platinum RTD, the in-amp yields a usable volts/C signal suitable for a 12-bit ADC or analog controller without additional amplification stages.
Recommended
Remote Transducer / Industrial Data Acquisition
For remote sensors connected over long cable runs, the dominant error source is common-mode interference picked up between the cable and the acquisition chassis. The INA101AG's 106 dB CMR at 60 Hz and 10^10 ohm differential input impedance make it well suited to 4-20 mA-sourced shunt measurements and microvolt-level remote signals where grounding differences exist between source and receiver. Its dual +/-5V to +/-20V supply tolerance accommodates legacy +/-15V industrial rails directly. The ceramic CDIP package withstands elevated ambient temperatures typical of control cabinets. Place input RC filters ahead of the in-amp and keep RG connections short to maintain the laser-trimmed gain accuracy.
Recommended
Medical / Biomedical Signal Amplification
Low-level biomedical signals such as ECG and EEG front ends historically used precision in-amps of this class; the INA101AG's 13 nV/rtHz noise, 10^10 ohm input impedance, and 106 dB CMR meet the baseline needs of electrode differential measurement, rejecting 50/60 Hz mains pickup at the electrodes. Its 300 kHz bandwidth comfortably covers the sub-kHz content of physiological signals. Note that the INA101 predates modern medical safety qualification, so designs must add patient isolation (isolation amplifier or digital isolator), input protection, and bias-current return paths, and must verify biocompatibility and IEC 60601 compliance at the system level rather than relying on the amplifier alone.
Recommended
Legacy Military / Aerospace Sustaining Designs
The ceramic 14-CDIP package of the INA101AG exists precisely for high-reliability and military platforms that specified ceramic packaging and through-hole assembly for vibration, temperature, and long-term reliability. Sustaining designs - avionics sensor conditioning, test-set instrumentation, and spares manufacturing for fielded systems - continue to require the AG-grade part. The 25 uV offset, 0.25 uV/C drift, and +/-20V supply tolerance support legacy +/-15V mil analog rails without redesign. When sourcing, verify date codes and distributor authenticity carefully because legacy CDIP precision parts are common counterfeit targets; buy from authorized or franchise distributors whenever stock permits.
Recommended
Recommended Products Summary
Engineering reference data for INA101AG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA101HP | INA101KP | INA101SG |
|---|---|---|---|---|
| Package | 14-CDIP (0.300", 7.62 mm) | 14-DIP (plastic) - pin-compatible | 14-DIP (plastic) - pin-compatible | 14-CDIP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Offset Voltage (max) | 25 uV | 25 uV | 50 uV class (commercial grade) | 25 uV |
| Supply Voltage Range | +/-5 V to +/-20 V | +/-5 V to +/-20 V | +/-5 V to +/-20 V | +/-5 V to +/-20 V |
| Bandwidth | 300 kHz | 300 kHz | 300 kHz | 300 kHz |
| Grade / Qualification | High accuracy, ceramic package | High accuracy, plastic package | Commercial grade, plastic package | Military grade (MIL screening) |
Key Differentiators
- Highest DC precision in the INA101 DIP family (vs INA101KP)
- Ceramic package for harsh environments (vs INA101HP)
- Lower cost than military screening (vs INA101SG)
Design Notes
Keep the gain-setting resistor RG leads as short as possible and locate it directly across the RG pins. Lead and trace resistance appears in series with the laser-trimmed internal gain network and directly degrades gain accuracy and drift; a few ohms of PCB trace can shift a gain-of-100 stage measurably. Use a 0.1% or better low-TC resistor for RG, and add a small capacitor across RG only if bandwidth reduction is acceptable.
The INA101 is a dual-supply device, not rail-to-rail; its input common-mode range and output swing both require several volts of headroom from each supply. Verify that the input common-mode voltage (bridge or electrode bias) stays within the linear region at your supply rails and gain - consult the datasheet common-mode range graph rather than assuming 0 V input works on single-supply-like configurations. Ignoring this is the most common cause of 'dead' or clipped INA101 channels.
Filter differential inputs at the connector with a matched RC (e.g., 10 kohm with 10 nF C0G) ahead of the input pins to protect against transients and limit RF rectification; match the resistors so CMR is not degraded. Use a ground plane and keep the output trace away from the input nets. Bypass each supply pin with 0.1 uF ceramic close to the package - the through-hole CDIP layout still benefits from short radial bypass paths.
Estimated: at +/-15 V supplies with the output near 0 V, quiescent dissipation is modest, but driving a 500-ohm load to 10 V peak adds roughly 10V x 20 mA = 200 mW in the device (10 mA source current through the output stage at +/-15 V rails); this is well within the CDIP thermal capability but should be verified against the package theta-JA when driving heavy DC loads.
Compliance Information
Legacy Burr-Brown ceramic DIP part; RoHS/lead-free status not stated in provided data - verify with TI product page or certificate of conformance before export-controlled or green-program builds.
