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Texas Instruments INA101SM
- Part No.:
- INA101SM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-100-10 Metal Can
- Datasheet:
-
INA101SM.pdf
- Description:
- IC INST AMP 1 CIRCUIT TO100-10
- Quantity:
- Payment:
- Shipping:
Inventory:4,890
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Product details
Overview
INA101SM 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 precision amplification of low-level differential signals such as those from strain gages and thermocouples. It delivers 0.25µV/°C max input offset drift, 25µV max initial offset voltage, 0.002% max nonlinearity, 13nV/√Hz input voltage noise at 1kHz, and 106dB CMR at 60Hz.
For engineers reviewing the INA101SM datasheet, INA101SM pinout, INA101SM application, or INA101SM equivalent, this page provides verified technical context, gain-setting methodology, thermal design considerations, and validated alternative options for ruggedized industrial and aerospace signal conditioning.
Technical Context
The INA101SM integrates three precision op amps and laser-trimmed 10kΩ and 20kΩ metal film resistors on a single monolithic die to achieve high common-mode rejection and stable gain accuracy. Its gain is set externally via a single resistor RG using the equation G = 1 + 40kΩ/RG, with internal feedback resistors contributing directly to specified gain error and drift.
It operates over –55°C to +125°C with ±15V nominal supply, delivering ±10V linear output swing into 2kΩ load and supporting full-power bandwidth up to 6.4kHz (G = 1–100). Input impedance is 10¹⁰Ω || 3pF differential and common-mode, and output is referenced to the Common terminal requiring ≤0.1Ω ground path for optimal CMR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 1000 V/V - supports wide dynamic range signal conditioning without cascaded stages |
| Input Offset Drift | 0.25µV/°C max - enables stable DC-coupled measurements across military temperature range |
| CMR @ 60Hz | 106dB at G = 100–1000 - rejects line-frequency interference in noisy industrial environments |
| Input Voltage Noise | 13nV/√Hz at 1kHz (G = 1000) - preserves SNR for µV-level sensor outputs |
| Nonlinearity | 0.002% max - ensures fidelity in precision data acquisition and calibration systems |
| Supply Voltage Range | ±5V to ±20V - accommodates legacy ±15V rails and extended-range power supplies |
| Quiescent Current | ±6.7mA typ - balances low power with high performance in always-on instrumentation |
Pinout & Package
INA101SM uses a hermetically sealed 10-pin TO-100 metal can package (package drawing 007), rated for –55°C to +125°C operation and suitable for high-reliability aerospace and defense applications. The package features low thermal resistance (θJC = 113°C/W for output stage) and ESD-sensitive handling requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +Input | Noninverting input of first-stage differential pair; high-Z node (10¹⁰Ω) |
| 2 | –Input | Inverting input of first-stage differential pair; matched to Pin 1 for CMR |
| 3 | –VCC | Negative supply connection; must be decoupled locally for stability |
| 4 | Offset Adjust | Input offset trim node; external potentiometer adjusts only input-stage offset |
| 5 | Offset Adjust | Dual offset adjust pin (tied internally); used with 100kΩ pot for ±15mV null range |
| 6 | +VCC | Positive supply connection; requires local 1µF tantalum decoupling |
| 7 | Common | Output reference node; must be low-impedance (<0.1Ω) to maintain >106dB CMR |
| 8 | Output | Differential output referenced to Common; drives loads ≥2kΩ for full swing |
| 9 | RG | External gain-setting resistor connection; determines G = 1 + 40kΩ/RG |
| 10 | No Connection | Unused pin; left floating per datasheet - no internal connection or function |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film resistors | Enables 0.04% gain error at G = 1 and <110ppm/°C gain drift at G = 100–1000 |
| Three-op-amp topology | Provides inherent high CMR (>106dB) and excellent input impedance matching |
| Separate Common reference pin | Allows output to be referenced to system ground or isolated reference plane |
| Offset adjustment architecture | Independent input- and output-offset trims prevent drift degradation during calibration |
| Military-grade temperature range | –55°C to +125°C operation validated per INA101SM ordering spec, not derated |
Applications
| Strain Gage Bridge Amplification | Thermocouple Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying mV-level differential output from 350Ω foil strain gages in structural health monitoring systems operating across extreme ambient temperatures. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and offset stability without external trimming. Use Value: 0.25µV/°C drift and 106dB CMR ensure measurement repeatability in unshielded industrial enclosures with 60Hz pickup. |
Use Scenario: Cold-junction compensated amplification of Type K thermocouple outputs (≈41µV/°C) in furnace control systems requiring ±0.5°C accuracy from –40°C to +1000°C. IC Role / Device Role / Timing Role: High-Z, low-drift front-end amplifier rejecting thermocouple lead noise and maintaining linearity over wide temperature span. Use Value: 0.002% nonlinearity and ±25µV offset enable direct digitization at 16-bit resolution without software correction. |
| RTD Temperature Sensing | Aerospace Transducer Interface |
|
Use Scenario: Exciting and amplifying 100Ω Pt RTD bridges in avionics environmental control units where self-heating and thermal EMFs must be minimized. IC Role / Device Role / Timing Role: Low-noise, low-bias-current instrumentation amplifier enabling 4-wire Kelvin sensing with minimal current injection. Use Value: ±5nA input bias current and 13nV/√Hz noise preserve bridge balance and avoid self-heating errors in low-power designs. |
Use Scenario: Signal conditioning for piezoresistive pressure transducers in satellite propulsion systems exposed to thermal cycling and radiation. IC Role / Device Role / Timing Role: Hermetic TO-100 packaged amplifier providing long-term stability and ESD-hardened interface for remote sensors. Use Value: Metal-can packaging and –55°C to +125°C qualification ensure reliability in vacuum and radiation-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA118P | SO-8 plastic package; 0.5µV/°C max drift; 100dB CMR at 60Hz; G = 1–1000 | Limited to 0°C to +70°C; lower CMR and drift than INA101SM; no TO-100 option | Select for commercial-grade cost-sensitive designs where hermetic sealing and extended temperature are unnecessary. |
| AD620ARZ | SO-8 package; 0.6µV/°C max drift; 130dB CMR at 60Hz; G = 1–1000; 1.3nV/√Hz noise | Higher CMR but higher drift; lacks separate Common pin; not qualified for –55°C operation | Choose when ultra-low noise dominates over temperature stability and output referencing flexibility. |
Compared with INA101SM, INA118P offers lower cost and smaller footprint but sacrifices military temperature range and hermetic reliability, while AD620ARZ improves noise and CMR at the expense of drift performance and thermal qualification - making INA101SM uniquely suited for high-stability, high-reliability analog front-ends.
Availability
INA101SM is available at Aetrix Electronics and suitable for aerospace transducer interfaces, ruggedized RTD temperature sensing, and high-accuracy strain gage amplification requiring stable component supply across extended temperature and long product lifecycles.
Supply support for INA101SM 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 including instrumentation amplifiers, data converters, and op amps for test and measurement.
The INA101 product line was engineered for demanding low-level signal acquisition in military, aerospace, and industrial instrumentation - emphasizing laser-trimmed accuracy, thermal stability, and robust packaging.
FAQ
What is the correct pin 1 orientation for INA101SM in the TO-100 package?
For INA101SM, pin 1 is identified by the tab on the TO-100 metal can package. When viewing the top of the device with the tab aligned at the 12 o'clock position, pin 1 is the first pin clockwise from the tab. This matches the standard TO-100 pinout defined in Burr-Brown package drawing 007 and confirmed in the INA101SM ordering addendum.
Can INA101SM operate with a single +15V supply?
No - INA101SM requires dual ±VCC supplies, with absolute maximum ratings of ±20V and recommended operation at ±15V. It does not support single-supply operation because its internal architecture relies on symmetrical rail-to-rail input common-mode range and output swing referenced to the Common pin. Attempting single-supply use will result in clipping and loss of functionality.
How is gain set on INA101SM, and what tolerance resistor should be used for G = 100?
Gain on INA101SM is set by an external resistor RG connected between pins 9 and 7 (Common), using the equation G = 1 + 40kΩ/RG. For G = 100, RG = 404Ω. A 0.1% tolerance, 25ppm/°C metal film resistor is recommended to minimize gain error contribution, as RG's TCR and tolerance dominate total gain inaccuracy per datasheet Note (1).
Why does INA101SM specify two offset adjust pins (pins 4 and 5), and how should they be used?
INA101SM provides two offset adjust pins (4 and 5) tied together internally to form a single 3-terminal potentiometer interface. A 100kΩ potentiometer is connected with its wiper to pin 4/5 and ends to pins 6 (+VCC) and 3 (–VCC), enabling ±15mV input offset null range. This configuration avoids introducing thermal EMFs that would degrade drift performance when using discrete resistors.
Is INA101SM RoHS compliant, and what is its lead finish?
Yes - INA101SM is RoHS compliant (per TI's Package Option Addendum), with gold (AU) lead finish. The "Last Time Buy" status reflects end-of-life planning by Texas Instruments, but active part number INA101SM.A maintains full RoHS compliance, traceable sourcing, and identical electrical and mechanical specifications as INA101SM.
INA101SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-100-10 Metal Can
- Packaging:
- Bulk
- 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:
- 10 nA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 6.7mA
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-100-10
INA101SM FAQ
1.How can I place an order for INA101SM through Aetrix?
Please submit a Request for Quotation (RFQ) for INA101SM 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 INA101SM reliable?
The price and inventory of INA101SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA101SM is usually 5 days.
3.What payment methods are accepted for INA101SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA101SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA101SM?
INA101SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA101SM 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 INA101SM?
For technical support, including INA101SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA101SM requirements.
6.How does Aetrix verify that INA101SM is sourced from the original manufacturer or authorized distributors?
All INA101SM 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 INA101SM meets industry standards.
7.What is the process for return or replacement of INA101SM?
All INA101SM units undergo pre-shipment inspection (PSI). If there is an issue with INA101SM, 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 INA101SM part is unused and in its original packaging.
Return procedure for INA101SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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