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Texas Instruments INA101KU
- Part No.:
- INA101KU
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
INA101KU.pdf
- Description:
- IC INST AMP 1 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,551
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Product details
Overview
INA101KU from Burr-Brown (now Texas Instruments) is a high-accuracy instrumentation amplifier optimized for low-level DC-coupled signal conditioning in precision measurement systems. 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 - enabling reliable amplification of thermocouple and strain gage outputs in industrial data acquisition.
For engineers reviewing the INA101KU datasheet, INA101KU pinout, INA101KU application, or INA101KU equivalent, key selection criteria include its SOL-16 surface-mount package, ±15V supply operation, gain range of 1–1000 set by single external resistor RG, laser-trimmed on-chip 10kΩ and 20kΩ metal film resistors, and guaranteed performance over 0°C to +70°C ambient temperature.
Technical Context
The INA101KU integrates three precision op amps and laser-trimmed thin-film resistors on a monolithic die to implement a three-op-amp instrumentation topology with fixed internal gain-setting network. Its architecture supports external gain adjustment via a single resistor (RG), where G = 1 + 40kΩ/RG, and includes dual offset adjust pins for input offset trimming at high gain (G ≥ 100).
It features differential input impedance of 10¹⁰ Ω || 3pF, common-mode rejection dependent on source imbalance (≥106dB at 60Hz with 1kΩ mismatch), and output referenced to a dedicated Common terminal requiring ≤0.1Ω impedance for full CMR specification compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 1000 V/V, set by single external resistor RG - enables flexible signal scaling without complex feedback networks. |
| Input Offset Drift | 0.25µV/°C max - ensures stable DC accuracy across temperature in unattended monitoring systems. |
| Input Voltage Noise | 13nV/√Hz at 1kHz (G = 1000) - preserves SNR for µV-level sensor signals like RTDs and thermopiles. |
| CMR @ 60Hz | 106dB min at G = 100–1000 - rejects line-frequency interference in noisy industrial environments. |
| Nonlinearity | 0.002% max (DC, full-scale) - maintains fidelity in high-resolution ADC front-ends without calibration. |
| Supply Voltage Range | ±5V to ±20V - supports operation from low-power ±5V rails up to robust ±15V industrial supplies. |
| Quiescent Current | ±6.7mA typ (±15V) - balances precision performance with moderate power consumption in continuous-use instruments. |
Pinout & Package
SOL-16 surface-mount package (SOIC-DW, 16-pin), RoHS-compliant, moisture sensitivity level 3 (260°C peak reflow, 168-hour floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | Offset Adjust | Inputs to internal trim circuitry; used with external potentiometer to null input offset at high gain (G ≥ 100). |
| 2 | –VCC | Negative supply connection; requires local 1µF tantalum decoupling for stability. |
| 3 | Common | Output reference node; must be connected with ≤0.1Ω impedance to ground to maintain 106dB CMR. |
| 4 | +VCC | Positive supply connection; requires local 1µF tantalum decoupling for stability. |
| 5, 12 | Gain Sense 1 / Gain Sense 2 | Feedback sense points that compensate for wiring/socket resistance error above G ≈ 100. |
| 6, 11 | Gain Set 1 / Gain Set 2 | Terminals across which external resistor RG is placed to set gain per G = 1 + 40kΩ/RG. |
| 7 | +Input | Non-inverting input of first-stage differential pair; 10¹⁰ Ω input impedance enables high-Z sensor interfacing. |
| 8 | –Input | Inverting input of first-stage differential pair; matched to Pin 7 for optimal CMR. |
| 9 | A1 Output | Output of first-stage amplifier A1; not user-accessible in standard configuration. |
| 10 | A2 Output | Output of second-stage amplifier A2; not user-accessible in standard configuration. |
| 13 | Output | Main buffered differential output; capable of ±10V swing into 2kΩ load with <0.2Ω output impedance. |
| 14, 15 | No Connect | Unused terminals; must remain unconnected per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film resistors | On-die 10kΩ and 20kΩ metal film resistors trimmed to absolute accuracy - eliminates external resistor matching and reduces gain drift dependency. |
| Dual gain-sense inputs | Pins 5 and 12 provide Kelvin sensing for RG - cancels wiring resistance error critical for gains ≥100 in PCB layouts with long traces or sockets. |
| Low thermal EMF package | SOL-16 SOIC minimizes thermocouple effects at pins - preserves sub-µV offset stability during ambient temperature transients. |
| Output-referenced common terminal | Dedicated Common pin (Pin 3) separates reference path from ground plane - prevents CMR degradation from shared-impedance return paths. |
| Input offset trim compatibility | Two dedicated Offset Adjust pins support external 100kΩ potentiometer - enables field calibration of input offset without affecting output stage drift. |
Applications
| Strain Gage Bridge Amplification | Thermocouple Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying mV-level differential output from 350Ω foil strain gages in load cells under varying ambient temperatures. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain of 500, rejecting bridge common-mode voltage and 60Hz pickup. Use Value: 0.25µV/°C drift and 106dB CMR ensure ≤0.02% full-scale error over 0–70°C without recalibration. |
Use Scenario: Cold-junction compensated amplification of Type K thermocouple outputs (≈41µV/°C) in HVAC controllers. IC Role / Device Role / Timing Role: DC-stable gain block with low 13nV/√Hz noise and high input Z to avoid loading thermocouple source impedance. Use Value: 25µV max input offset and 0.002% nonlinearity enable ±0.5°C measurement accuracy over –20°C to +120°C system range. |
| RTD Temperature Measurement | Medical ECG Front-End |
|
Use Scenario: Exciting 100Ω Pt RTD with constant current and amplifying resulting voltage drop in industrial process sensors. IC Role / Device Role / Timing Role: High-Z differential amplifier rejecting lead-wire resistance imbalance and 50/60Hz interference. Use Value: 10¹⁰ Ω input impedance and 106dB CMR eliminate errors from 3-wire RTD lead resistance mismatches up to 10Ω. |
Use Scenario: Low-noise amplification of microvolt-level cardiac signals in portable ECG monitors with battery-powered operation. IC Role / Device Role / Timing Role: First-stage signal conditioner rejecting electrode half-cell potentials and power-line interference. Use Value: 0.002% nonlinearity and 13nV/√Hz noise preserve QRS complex morphology for accurate R-wave detection algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD620ARZ | Lower quiescent current (1.3mA), higher gain drift (5ppm/°C), no gain-sense pins, 8-pin SOIC package. | Better suited for battery-powered portable devices; lacks Kelvin RG sensing for high-gain stability. | Select AD620ARZ when power budget is constrained and gain ≤100; avoid for precision industrial systems requiring G > 100 stability. |
| INA128UA | Higher input bias current (500pA typ), lower CMR (110dB), same SOL-16 package, improved MSL rating (Level-2a). | More robust against ESD and moisture; slightly higher noise (15nV/√Hz) but wider bandwidth (1.3MHz @ G=100). | Select INA128UA for new designs needing enhanced manufacturability and broader bandwidth; INA101KU remains preferred for ultra-low drift (<0.3µV/°C) legacy calibrations. |
Compared with AD620ARZ and INA128UA, the INA101KU provides superior DC precision (0.25µV/°C drift vs ≥5ppm/°C) and integrated gain-sense capability for high-gain stability, making it irreplaceable in metrology-grade calibration equipment where long-term offset repeatability is mandatory.
Availability
INA101KU is available at Aetrix Electronics and suitable for industrial process control, medical diagnostics equipment, and test & measurement instrumentation requiring stable component supply across extended product lifecycles.
Supply support for INA101KU 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 measurement and signal conditioning applications.
The INA101 product line was engineered for DC-accurate amplification of microvolt-level sensor outputs in laboratory, industrial, and medical instrumentation - prioritizing offset stability, CMR integrity, and noise performance over speed.
FAQ
What is the maximum gain achievable with INA101KU and how is it set?
The INA101KU supports a gain range of 1 to 1000 V/V, set by a single external resistor RG connected between Pins 6 and 11 (Gain Set 1/2) and sensed at Pins 5 and 12 (Gain Sense 1/2). The gain equation is G = 1 + 40kΩ/RG; for G = 1000, RG = 40.04Ω. The SOL-16 layout's Kelvin sensing minimizes wiring resistance error at high gains, ensuring accuracy remains within ±0.3% even with PCB trace resistance.
Does INA101KU require external components for basic operation?
Yes - the INA101KU requires an external gain-setting resistor RG, ±15V (or ±5V to ±20V) dual supplies, and two 1µF tantalum decoupling capacitors (one from +VCC to Common, one from –VCC to Common). Optional 100kΩ potentiometers may be added to Pins 1/16 for input offset trim at G ≥ 100. No external compensation or filtering is needed for unity-gain stable operation.
What is the purpose of the Common pin (Pin 3) on INA101KU?
The Common pin (Pin 3) serves as the output reference node - all output voltage is measured relative to this terminal, not ground. To achieve the specified 106dB CMR, the impedance between Pin 3 and system ground must be ≤0.1Ω. Routing this connection as a dedicated low-inductance trace (not shared with power or digital returns) is essential; violating this degrades CMR by up to 20dB.
Can INA101KU operate from a single supply?
No - the INA101KU is designed exclusively for dual-supply operation (±5V to ±20V). Its internal architecture relies on symmetrical positive and negative rails to bias the three-op-amp core and deliver true bipolar output swing (±10V typical). Attempting single-supply use results in clipping, undefined bias points, and failure to meet datasheet specifications for offset, CMR, or linearity.
How does the INA101KU handle input overvoltage conditions?
The INA101KU has no built-in input protection diodes. Absolute maximum ratings specify input voltage range as ±VCC; exceeding this - even briefly - risks latch-up or permanent damage. For applications with potential overvoltage (e.g., sensor disconnect transients), external series resistors (≤1kΩ) and clamping diodes to ±VCC are required. The device's ESD sensitivity (Class 1B per ANSI/ESDA/JEDEC JS-001) further mandates strict handling protocols during assembly.
INA101KU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- 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:
- 125 µV
- Current - Supply:
- 6.7mA
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
INA101KU FAQ
1.How can I place an order for INA101KU through Aetrix?
Please submit a Request for Quotation (RFQ) for INA101KU 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 INA101KU reliable?
The price and inventory of INA101KU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA101KU is usually 5 days.
3.What payment methods are accepted for INA101KU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA101KU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA101KU?
INA101KU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA101KU 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 INA101KU?
For technical support, including INA101KU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA101KU requirements.
6.How does Aetrix verify that INA101KU is sourced from the original manufacturer or authorized distributors?
All INA101KU 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 INA101KU meets industry standards.
7.What is the process for return or replacement of INA101KU?
All INA101KU units undergo pre-shipment inspection (PSI). If there is an issue with INA101KU, 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 INA101KU part is unused and in its original packaging.
Return procedure for INA101KU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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