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Texas Instruments INA166UA/2K5
- Part No.:
- INA166UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA166UA/2K5.pdf
- Description:
- IC INST AMP 1 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,879
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Product details
Overview
INA166UA/2K5 from Texas Instruments is a low-noise, low-distortion instrumentation amplifier with fixed gain G = 2000, 1.3nV/√Hz input voltage noise at 1kHz, 450kHz bandwidth, and ±4.5V to ±18V supply range. It serves as a precision front-end amplifier for microphones, hydrophones, and bridge transducers in industrial and medical signal conditioning systems.
For engineers reviewing the INA166UA/2K5 datasheet, INA166UA/2K5 pinout, INA166UA/2K5 application, or INA166UA/2K5 equivalent, this page delivers verified specifications, SO-14 package layout, real-world use scenarios, and two validated alternative parts for low-level differential amplification where wide bandwidth and sub-0.1% THD+N are critical.
Technical Context
The INA166UA/2K5 employs current-feedback architecture with a three-op-amp topology (A1/A2 input stage, A3 output stage), enabling high slew rate (15V/µs) and fast settling (2.5µs to 0.1%). Its internal laser-trimmed resistor network fixes gain at 2000 while maintaining >100dB CMR across DC–100kHz.
It features dedicated Sense (Pin 8) and Reference (Pin 10) terminals for remote-sense load regulation, and its input stabilization network supports stable operation with low-impedance sources (<10Ω), mitigating oscillation risk without compromising noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed at G = 2000; enables precise amplification of µV-level sensor outputs without external gain-setting components. |
| Voltage Noise | 1.3nV/√Hz at 1kHz; delivers near-theoretical noise floor for 200Ω source impedance, critical for microphone/hydrophone preamps. |
| THD+N | 0.09% at 1kHz; ensures minimal harmonic distortion in audio and precision measurement chains. |
| Bandwidth | 450kHz (–3dB); supports wideband dynamic signals such as ultrasonic transducer outputs and fast industrial sensors. |
| CMR | >100dB at ±1V common-mode voltage; rejects interference in noisy industrial environments with unshielded cabling. |
| Supply Range | ±4.5V to ±18V; accommodates diverse system rails including ±5V, ±12V, and ±15V analog backplanes. |
| Input Offset Voltage | ±250µV max; enables accurate DC-coupled measurements without frequent nulling in static sensor applications. |
Pinout & Package
INA166UA/2K5 is housed in a standard SOIC-14 (D) surface-mount package (JEDEC MS-012AC), 8.65mm × 3.91mm footprint, 1.75mm height, MSL Level-3 rated for 260°C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | V+ / V– | Positive/negative supply rails; bypass with 0.1µF tantalum capacitors placed within 5mm for stability. |
| 2, 13 | VO2 / VO1 | Output stage buffers; VO1 drives main output (Pin 6), VO2 provides auxiliary drive capability. |
| 3, 12 | GS2 / GS1 | Gain-set terminals; internally connected to define G = 2000; external RG between them increases gain. |
| 4, 5 | VIN– / VIN+ | Differential inputs; high-impedance (60MΩ || 2pF), optimized for low-noise, low-Z sources (≤10Ω recommended). |
| 6 | VO | Main output; rail-to-rail swing limited to (V+)–1.8V and (V–)+1.8V into 2kΩ load. |
| 8 | Sense | Remote sense feedback node; connects directly to load to compensate for I·R drop in long traces or cables. |
| 10 | Ref | Output reference terminal; accepts external offset trim voltage (e.g., via op-amp buffer) for DC calibration. |
| 7, 9, 11 | NC | No internal connection; must remain unconnected per datasheet to avoid parasitic coupling or instability. |
Key Features
| Feature | Design Value |
|---|---|
| Distortion cancellation circuitry | Reduces THD+N to 0.09% at 1kHz by actively canceling even-order harmonics in the input stage. |
| Internal laser-trimmed resistors | Ensures ±0.3% initial gain error and ±10ppm/°C drift, eliminating manual calibration in production test. |
| Output sense and reference terminals | Enable closed-loop compensation of PCB trace resistance, improving gain accuracy under varying load conditions. |
| Stable with low-impedance sources | Operates reliably with source impedances <10Ω when used with recommended 47Ω + 1.2µH input network. |
| Wide temperature specification | Guaranteed performance from –40°C to +85°C ambient, supporting industrial control and outdoor instrumentation. |
Applications
| Microphone Preamplifier | Differential Bridge Receiver |
|---|---|
|
Use Scenario: Amplifying low-level AC-coupled signals from condenser microphones in studio recording interfaces. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing fixed 66dB gain (G=2000) with ultra-low noise floor. Use Value: 1.3nV/√Hz noise preserves signal integrity for 24-bit ADCs; 450kHz bandwidth captures full audio spectrum up to 200kHz. |
Use Scenario: Reading mV-level differential outputs from strain-gauge Wheatstone bridges in load cells and pressure sensors. IC Role / Device Role / Timing Role: High-CMR front-end amplifier rejecting common-mode noise induced by motor drives or switching power supplies. Use Value: >100dB CMR at 1kHz suppresses EMI from adjacent 50/60Hz mains and PWM inverters in factory-floor environments. |
| Hydrophone Signal Conditioning | Moving-Coil Transducer Amplifier |
|
Use Scenario: Boosting weak underwater acoustic signals (10–100kHz) in sonar and marine monitoring systems. IC Role / Device Role / Timing Role: Low-noise, wideband amplifier with stable DC-coupled response for transient detection and spectral analysis. Use Value: 15V/µs slew rate resolves fast pressure wavefronts; 0.09% THD+N prevents harmonic masking in narrowband filtering stages. |
Use Scenario: Driving analog inputs of data acquisition systems from geophone or seismic vibration sensors. IC Role / Device Role / Timing Role: Fixed-gain, low-drift amplifier converting high-impedance coil outputs into robust single-ended signals. Use Value: ±250µV max input offset minimizes baseline drift during long-duration seismic event logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8429ARZ | Lower noise (0.94nV/√Hz), higher gain accuracy (±0.02% max), but narrower bandwidth (3.5MHz at G=1, degrades to ~200kHz at G=2000). | Better suited for ultra-low-noise DC-coupled applications requiring <100µV offset; less optimal for wideband AC signals above 300kHz. | Select AD8429ARZ when absolute lowest noise and highest DC precision outweigh bandwidth needs. |
| INA128UA | Higher noise (7nV/√Hz), lower bandwidth (1.3MHz at G=1, ~100kHz at G=2000), but wider supply range (±2.25V to ±18V) and lower quiescent current (700µA vs 22mA). | Preferred for battery-powered portable instruments where power efficiency and moderate noise tolerance are acceptable. | Select INA128UA when operating from low-voltage rails or extending battery life is prioritized over bandwidth and noise. |
Compared with AD8429ARZ and INA128UA, the INA166UA/2K5 uniquely balances 1.3nV/√Hz noise, 450kHz bandwidth at G=2000, and robust industrial temperature rating - making it optimal for wideband, medium-power sensor front-ends where both fidelity and speed matter.
Availability
INA166UA/2K5 is available at Aetrix Electronics and suitable for microphone preamplifiers, bridge transducer receivers, hydrophone signal conditioners, and moving-coil transducer amplifiers requiring stable component supply across extended production cycles.
Supply support for INA166UA/2K5 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal chain solutions.
The INA166 belongs to TI's high-performance instrumentation amplifier product line, engineered specifically for low-noise, wideband amplification of microvolt-level sensor outputs in demanding industrial, medical, and test equipment.
FAQ
What is the gain configuration of INA166UA/2K5?
The INA166UA/2K5 has a fixed internal gain of G = 2000, achieved via laser-trimmed resistors. While external resistor RG can be added between Pins 3 and 12 to increase gain, the default configuration requires no external components - simplifying layout and ensuring consistent performance across units without gain-setting tolerances.
Does INA166UA/2K5 support rail-to-rail output swing?
No, the INA166UA/2K5 does not provide rail-to-rail output. Its output voltage swing is specified as (V+)–1.8V and (V–)+1.8V into a 2kΩ load. This headroom requirement must be accounted for in system-level design, especially when operating near supply limits like ±5V.
Can INA166UA/2K5 be used with high-impedance sources like piezoelectric sensors?
The INA166UA/2K5 is optimized for low-impedance sources (≤10Ω); its relatively high input bias current (2.5–12µA) and current noise make it unsuitable for high-Z sources such as piezoelectric sensors. For those, consider charge amplifiers or JFET-input instrumentation amplifiers instead.
What is the purpose of the Sense and Ref pins on INA166UA/2K5?
Pin 8 (Sense) and Pin 10 (Ref) enable remote sensing and output offset adjustment. Sense closes the feedback loop at the load to compensate for trace resistance voltage drop, while Ref accepts an externally buffered voltage to trim output DC offset - both features improve system-level accuracy without additional op-amps.
Is INA166UA/2K5 RoHS compliant and what is its moisture sensitivity level?
Yes, INA166UA/2K5 is RoHS compliant with NIPDAU lead finish and JEDEC MSL Level-3 rating (260°C peak reflow, 168-hour floor life). Its tape-and-reel packaging (2500 units/reel) follows TI's standard shipping and handling guidelines for surface-mount assembly.
INA166UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 15V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 450 kHz
- Current - Input Bias:
- 2.5 µA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 10mA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
INA166UA/2K5 FAQ
1.How can I place an order for INA166UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA166UA/2K5 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 INA166UA/2K5 reliable?
The price and inventory of INA166UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA166UA/2K5 is usually 5 days.
3.What payment methods are accepted for INA166UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA166UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA166UA/2K5?
INA166UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA166UA/2K5 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 INA166UA/2K5?
For technical support, including INA166UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA166UA/2K5 requirements.
6.How does Aetrix verify that INA166UA/2K5 is sourced from the original manufacturer or authorized distributors?
All INA166UA/2K5 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 INA166UA/2K5 meets industry standards.
7.What is the process for return or replacement of INA166UA/2K5?
All INA166UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA166UA/2K5, 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 INA166UA/2K5 part is unused and in its original packaging.
Return procedure for INA166UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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