My Inquiry
My Account
Texas Instruments INA166UA/2K5G4
- Part No.:
- INA166UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA166UA/2K5G4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,295
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
INA166UA/2K5G4 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 instrumentation.
For engineers reviewing the INA166UA/2K5G4 datasheet, INA166UA/2K5G4 pinout, INA166UA/2K5G4 application, or INA166UA/2K5G4 equivalent, key selection criteria include its current-feedback architecture enabling wide bandwidth at high gain, laser-trimmed internal resistors ensuring >100dB CMR, and SO-14 package compatibility with space-constrained PCB layouts.
Technical Context
The INA166UA/2K5G4 employs a three-op-amp current-feedback topology with A1/A2 input stage (gain = 200) and A3 output stage (gain = 10), achieving fixed total gain of 2000 via laser-trimmed 6kΩ/60kΩ resistor networks. Its differential input stage delivers 60MΩ||2pF input impedance and supports common-mode voltages within (V±) ±3V.
Dynamic performance is defined by 15V/µs slew rate, 2.5µs 0.1% settling time for 5V step, and 1µs overload recovery after 50% overdrive. Input-referred THD+N is 0.09% at 1kHz, and power-supply rejection exceeds 100dB up to 10kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed G = 2000; achieves high-precision amplification without external gain-setting components. |
| Voltage Noise | 1.3nV/√Hz at 1kHz; enables near-theoretical SNR with 200Ω source impedance. |
| Bandwidth | 450kHz (–3dB); supports audio and ultrasonic signal conditioning up to ~200kHz usable bandwidth. |
| CMR | >100dB at ±1V common-mode; rejects interference in noisy industrial sensor environments. |
| Slew Rate | 15V/µs; maintains fidelity on fast-rising transducer outputs without slew-induced distortion. |
| Supply Range | ±4.5V to ±18V; accommodates legacy ±5V, ±12V, and ±15V systems without level-shifting. |
| Input Offset | ±250µV max; ensures DC accuracy in strain-gauge and pressure-sensor bridge interfaces. |
Pinout & Package
INA166UA/2K5G4 is housed in a 14-pin SOIC (SO-14) surface-mount package with θJA = 100°C/W, rated for –40°C to +85°C operation and RoHS-compliant NIPDAU lead finish (MSL Level-3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | V+ / V– | Positive/negative supply rails; bypass with 0.1µF tantalum capacitors adjacent to pins for stability. |
| 2, 13 | NC | No internal connection; must remain unconnected per datasheet. |
| 3, 12 | GS1 / GS2 | Gain-set terminals; internally connected to 60kΩ resistors; RG between them increases gain beyond 2000. |
| 4, 5 | VIN– / VIN+ | Differential inputs; support common-mode range of (V±) ±3V with 60MΩ||2pF impedance. |
| 6, 11 | VO1 / VO2 | Output stage outputs; used with Sense (pin 8) and Ref (pin 10) for load-regulated feedback. |
| 7 | Ref | Output reference node; low-impedance connection required (<5Ω) to preserve CMR. |
| 8 | Sense | Output sense terminal; connects at load to eliminate I·R drop error in high-current drive configurations. |
| 9, 10 | NC / Ref | Pin 9: NC; Pin 10: alternate Ref node-buffered connection required for offset trim (Fig. 3). |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Ensures ±0.3% gain error and >100dB CMR without external trimming components. |
| Current-feedback architecture | Delivers 450kHz bandwidth and 15V/µs slew rate independent of gain setting. |
| Input stabilization network support | Accepts 47Ω + 1.2µH series network (Fig. 2) to suppress oscillation with low-Z sources <10Ω. |
| Output sense and reference terminals | Enable remote sensing at load to maintain gain accuracy despite PCB trace resistance. |
| Offset voltage trim capability | Pin 10 accepts buffered DC voltage to adjust output offset without degrading CMR. |
Applications
| Microphone Preamplifier | Bridge Transducer Amplifier |
|---|---|
|
Use Scenario: Amplifying low-level AC-coupled signals from condenser microphones in studio recording equipment. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing fixed 66dB gain with minimal added noise. Use Value: 1.3nV/√Hz input noise preserves dynamic range of 120dB SPL acoustic inputs without requiring post-amplification filtering. |
Use Scenario: Conditioning mV-level differential output from full-bridge strain gauges in load-cell-based weighing systems. IC Role / Device Role / Timing Role: High-CMR front-end amplifier rejecting common-mode noise induced by motor drives and switching power supplies. Use Value: >100dB CMR at 50/60Hz eliminates line-frequency interference without notch filtering, preserving signal integrity. |
| Differential Receiver | Moving-Coil Transducer Amplifier |
|
Use Scenario: Receiving balanced analog signals over twisted-pair cables in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Differential line receiver converting cable-borne signals to single-ended output while rejecting EMI. Use Value: 450kHz bandwidth supports high-speed analog data transmission up to 200ksps without phase distortion. |
Use Scenario: Amplifying output from geophone or hydrophone arrays used in seismic monitoring and underwater acoustics. IC Role / Device Role / Timing Role: Low-noise, wide-bandwidth amplifier capturing sub-10Hz to 10kHz ground motion signatures. Use Value: 2nV/√Hz noise at 10Hz enables detection of weak seismic events below 0.1g acceleration thresholds. |
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 drift (±15ppm/°C), no internal gain-setting resistors. | Requires external gain resistors; better for ultra-low-noise <100Ω source applications but less integrated. | Select AD8429ARZ when absolute minimum voltage noise dominates design priority and board area allows external resistor layout. |
| INA128UA | Higher noise (1.8nV/√Hz), lower bandwidth (1.3MHz), pin-compatible SO-14 but G = 10–10000 via RG. | Wider programmable gain range; suitable for multi-range sensor systems but sacrifices low-noise performance. | Select INA128UA when variable gain is required across multiple sensor types and 1.8nV/√Hz noise remains acceptable. |
Compared with AD8429ARZ and INA128UA, the INA166UA/2K5G4 provides optimal balance of fixed high gain, ultra-low noise, and integration-eliminating external gain resistors while maintaining 450kHz bandwidth and >100dB CMR in a single SO-14 package.
Availability
INA166UA/2K5G4 is available at Aetrix Electronics and suitable for microphone preamplifiers, bridge transducer interfaces, differential receivers, and moving-coil transducer amplifiers requiring stable component supply and long-term industrial availability.
Supply support for INA166UA/2K5G4 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers and signal-conditioning ICs.
The INA166 belongs to TI's high-performance instrumentation amplifier product line, designed specifically for low-noise, high-CMR amplification of millivolt-level sensor outputs in demanding industrial, medical, and test equipment.
FAQ
What is the gain configuration of the INA166UA/2K5G4?
The INA166UA/2K5G4 features a fixed internal gain of G = 2000, achieved through laser-trimmed 6kΩ and 60kΩ resistor networks. While gain can be increased using an external resistor between pins 3 and 12, the device is optimized and specified for operation at G = 2000, with ±0.3% typical gain error and ±10ppm/°C temperature drift. This fixed-gain architecture eliminates gain-setting component tolerances in the INA166UA/2K5G4 design.
Does the INA166UA/2K5G4 require external compensation or filtering?
The INA166UA/2K5G4 is internally compensated and stable with 2kΩ loads and ≤1000pF capacitance. However, for source impedances below 10Ω, TI recommends adding a 47Ω resistor and 1.2µH inductor in series with each input (Figure 2) to prevent oscillation. No external frequency compensation is needed for standard operation, but bypass capacitors (0.1µF tantalum) are mandatory at V+ and V– pins per the INA166UA/2K5G4 datasheet.
How does the Sense and Ref functionality improve accuracy in the INA166UA/2K5G4?
The Sense (pin 8) and Ref (pin 10) terminals enable remote sensing at the load to compensate for voltage drop across PCB traces or connectors. By routing Sense to the actual load point and keeping Ref at low impedance (<5Ω), the INA166UA/2K5G4 closes the feedback loop around the entire signal path. This maintains gain accuracy even with 100mA output currents, eliminating errors caused by I·R losses that would otherwise degrade the INA166UA/2K5G4's ±0.3% gain specification.
What is the maximum operating temperature range for the INA166UA/2K5G4?
The INA166UA/2K5G4 is specified for operation from –40°C to +85°C, with extended operating capability up to +125°C. Its SOIC package has a thermal resistance θJA of 100°C/W, and junction temperature must not exceed +150°C. For continuous operation at elevated ambient temperatures, derating of supply current and output load is required per the absolute maximum ratings table in the INA166UA/2K5G4 datasheet.
Can the INA166UA/2K5G4 drive heavy capacitive loads?
The INA166UA/2K5G4 is stable driving up to 1000pF capacitive loads directly, as confirmed in the datasheet's "Load Capacitance Stability" specification. Driving larger capacitive loads (e.g., >2nF) requires isolation with a series resistor (≥150Ω) or use of an external buffer such as the BUF634 shown in Figure 4. Without such measures, excessive phase shift may cause instability or ringing in the INA166UA/2K5G4 output response.
INA166UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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/2K5G4 FAQ
1.How can I place an order for INA166UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA166UA/2K5G4 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/2K5G4 reliable?
The price and inventory of INA166UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA166UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for INA166UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA166UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA166UA/2K5G4?
INA166UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA166UA/2K5G4 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/2K5G4?
For technical support, including INA166UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA166UA/2K5G4 requirements.
6.How does Aetrix verify that INA166UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All INA166UA/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of INA166UA/2K5G4?
All INA166UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA166UA/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for INA166UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA166UA/2K5G4 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
