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Texas Instruments INA101AM
- Part No.:
- INA101AM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-100-10 Metal Can
- Datasheet:
-
INA101AM.pdf
- Description:
- IC INST AMP 1 CIRCUIT TO100-10
- Quantity:
- Payment:
- Shipping:
Inventory:1,525
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Product details
Overview
INA101AM from Burr-Brown (now Texas Instruments) is a high-accuracy, laser-trimmed instrumentation amplifier in a 10-pin TO-100 metal can package, designed for low-level signal amplification with 0.25µV/°C max offset drift, 25µV max initial offset voltage, and 106dB CMR at 60Hz. It operates over –25°C to +85°C and is used in precision strain gage, thermocouple, and RTD measurement systems.
For engineers reviewing the INA101AM datasheet, INA101AM pinout, INA101AM application, or INA101AM equivalent, key selection criteria include gain-setting resistor dependency, dual offset trim capability (input and output), TO-100 thermal stability, and ±15V supply compatibility in low-noise analog front-ends.
Technical Context
The INA101AM integrates three precision op amps and laser-trimmed 10kΩ/20kΩ metal film resistors on a single monolithic die, enabling fixed-gain architecture with external RG control (G = 1 + 40kΩ/RG). Its input stage uses matched FET-input topology for 10¹⁰Ω input impedance and ultra-low bias current (±15nA typical).
It features separate input offset adjustment pins (pins 4 & 5) and output common-based offset trimming via the Common terminal (pin 7), supporting independent nulling of amplifier-specific vs. system-induced offsets - critical for G ≥ 100 applications where drift contribution must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 1000 V/V, set by single external resistor RG |
| Input Offset Voltage | ±25 µV max at +25°C, enabling sub-100µV system-level DC error budgets |
| Offset Drift | 0.25 µV/°C max, ensuring <1µV total drift over 40°C industrial range |
| CMR @ 60Hz | 106 dB at G = 100–1000, rejecting line-frequency interference in unshielded sensor wiring |
| Input Noise Density | 13 nV/√Hz at 1kHz (G = 1000), suitable for µV-level thermocouple signals |
| Small-Signal Bandwidth | 2.5 kHz at G = 1000, supporting static-to-slow-varying transducer outputs |
| Supply Voltage Range | ±5 V to ±20 V, allowing operation from ±12V rails in legacy industrial systems |
Pinout & Package
INA101AM is housed in a hermetically sealed 10-pin TO-100 metal can package (Package Drawing 007), optimized for low thermal EMF, minimal air-current sensitivity, and stable long-term offset performance in precision metrology environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | –Input | Inverting input of first-stage differential pair; high-impedance node requiring guarded layout |
| 2 | +Input | Non-inverting input of first-stage differential pair; matched to Pin 1 for CMR optimization |
| 3 | –VCC | Negative supply connection; decoupling capacitor required within 1 cm for noise immunity |
| 4, 5 | Offset Adjust | Differential inputs to internal trim network; 100kΩ potentiometer connects across them for input offset null |
| 6 | RG | External gain-setting resistor connection point; low-thermal-EMF wiring essential above G = 100 |
| 7 | Common | Output reference node; must be low-impedance (<0.1Ω) to maintain >106dB CMR |
| 8 | +VCC | Positive supply connection; separate decoupling from Pin 3 recommended |
| 9, 10 | Output | Single-ended output referenced to Common; drives 2kΩ load with 0.2Ω output impedance |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film resistors | Enables 0.04% gain error at G = 1 without external calibration |
| Dual offset trimming | Independent input (Pins 4/5) and output (via Common pin) nulling prevents drift coupling in high-G setups |
| TO-100 metal can packaging | Provides hermetic seal, low thermal time constant, and <0.1µV/°C thermal EMF for stable DC performance |
| 10¹⁰Ω input impedance | Minimizes loading error on high-Z sources like piezoresistive sensors and pH electrodes |
| 13nV/√Hz input noise | Supports resolution better than 16-bit ENOB at 10Hz bandwidth for µV-level transducers |
Applications
| Strain Gage Bridge Amplification | Thermocouple Signal Conditioning |
|---|---|
Use Scenario: Amplifying mV-level differential output from full-bridge strain gages in load cells and pressure transducers. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and offset stability in analog front-end. Use Value: 106dB CMR suppresses bridge excitation noise; 0.25µV/°C drift ensures calibrated accuracy over temperature cycling. |
Use Scenario: Cold-junction compensated amplification of Type K/J thermocouple outputs (10–60µV/°C) with linearization. IC Role / Device Role / Timing Role: High-Z, low-drift gain block interfacing thermocouple to ADC, rejecting EMI in industrial enclosures. Use Value: 10¹⁰Ω input impedance prevents thermocouple self-heating; 25µV offset enables ±0.5°C resolution at 25°C. |
| RTD Temperature Sensing | Medical Biopotential Acquisition |
Use Scenario: Exciting 100Ω/1000Ω Pt RTDs with constant current and amplifying resulting voltage drop in 4-wire configurations. IC Role / Device Role / Timing Role: Low-noise, high-CMR amplifier isolating RTD signal from lead resistance and power supply ripple. Use Value: 13nV/√Hz noise floor supports <0.01°C resolution in 10Hz bandwidth; TO-100 package minimizes thermal gradients. |
Use Scenario: Front-end amplification of ECG/EEG signals (0.1–5mV) in diagnostic-grade patient monitors. IC Role / Device Role / Timing Role: Primary gain stage delivering high CMR, low drift, and low 1/f noise for biopotential integrity. Use Value: 0.8µV p-p 0.01–10Hz noise enables clean baseline; 106dB CMR rejects 60Hz mains interference without notch filters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD620ARZ | Higher 1.3µV/°C max drift; 120dB CMR at 60Hz; SOIC-8 package | Better CMR but higher drift limits use in wide-temperature medical calibrations | Preferred when board space is constrained and CMR >106dB is mandatory |
| INA128UA | Lower 0.1µV/°C max drift; 120dB CMR; DIP-8 package; requires dual external resistors for gain | Superior drift spec but less flexible gain equation (G = 5 + 80kΩ/RG) | Chosen when long-term calibration stability outweighs gain-setting simplicity |
Compared with INA101AM, AD620ARZ offers higher CMR but doubles offset drift, while INA128UA reduces drift by 60% but sacrifices the single-resistor gain flexibility and TO-100 thermal stability - making INA101AM optimal for calibrated lab-grade transducer interfaces where thermal EMF and layout-controlled drift dominate.
Availability
INA101AM is available at Aetrix Electronics and suitable for precision strain gage instrumentation, thermocouple signal conditioning, and RTD temperature sensing requiring stable component supply across extended product lifecycles.
Supply support for INA101AM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in high-precision analog ICs for test and measurement, industrial control, and medical instrumentation.
The INA101 series was developed to deliver laboratory-grade DC accuracy in ruggedized packaging, targeting applications where laser-trimmed resistor matching and hermetic sealing were essential for metrology-grade repeatability.
FAQ
What is the maximum gain achievable with INA101AM and how is it set?
The INA101AM supports a gain range of 1 V/V to 1000 V/V, set by a single external resistor RG using the equation G = 1 + 40kΩ/RG. For G = 1000, RG = 40.04Ω - requiring a low-TCR, low-thermal-EMF resistor and careful PCB layout to avoid wiring resistance errors. The TO-100 package's thermal stability helps maintain gain accuracy across temperature swings.
Does INA101AM require external capacitors for stability?
Yes, the INA101AM requires 1µF tantalum decoupling capacitors between +VCC and Common, and between –VCC and Common, placed within 1 cm of the device pins. This is specified in Figure 1 of the datasheet to prevent oscillation and ensure 106dB CMR performance, especially with noisy or high-impedance supplies.
Can INA101AM operate from ±12V supplies instead of ±15V?
Yes, INA101AM is fully specified for ±5V to ±20V operation. At ±12V, its rated output swing remains ±10V (typical), and quiescent current drops to ~7.5mA per rail. All key specs - including CMR, offset drift, and noise - remain valid, making it compatible with modern industrial systems using ±12V rails.
How does the Common pin function in INA101AM?
The Common pin (Pin 7) serves as the output reference node and enables output offset trimming. It must be connected to a low-impedance ground (<0.1Ω) to preserve CMR. Applying a voltage to this pin sums directly with the output, allowing precise zeroing of output-stage offset - a feature not available in most competing instrumentation amplifiers.
Is INA101AM RoHS compliant and what is its current status?
Yes, INA101AM is RoHS compliant (lead finish: Call TI; material: TO-100 metal can). Per Texas Instruments' packaging addendum, INA101AM.A is Active production status with temperature range –55°C to +125°C, while the base INA101AM is Last Time Buy - Aetrix Electronics maintains legacy inventory with full traceability and lifecycle support.
INA101AM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-100-10 Metal Can
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 300 kHz
- Current - Input Bias:
- 15 nA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 6.7mA
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-100-10
INA101AM FAQ
1.How can I place an order for INA101AM through Aetrix?
Please submit a Request for Quotation (RFQ) for INA101AM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA101AM reliable?
The price and inventory of INA101AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA101AM is usually 5 days.
3.What payment methods are accepted for INA101AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA101AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA101AM?
INA101AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA101AM order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA101AM?
For technical support, including INA101AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA101AM requirements.
6.How does Aetrix verify that INA101AM is sourced from the original manufacturer or authorized distributors?
All INA101AM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA101AM meets industry standards.
7.What is the process for return or replacement of INA101AM?
All INA101AM units undergo pre-shipment inspection (PSI). If there is an issue with INA101AM, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA101AM part is unused and in its original packaging.
Return procedure for INA101AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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