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HomeProductsIntegrated Circuits (ICs)Linear - Amplifiers - Instrumentation, OP Amps, Buffer AmpsINA128U/2K5G4
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INA128U/2K5G4 - Texas Instruments

Manufacturer Part Number
INA128U/2K5G4
Manufacturer
Texas Instruments
Allelco Part Number
32D-INA128U/2K5G4
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
7,000 pcs available, New & Original
Parts Description
IC INST AMP 1 CIRCUIT 8SOIC
Package
8-SOIC
Data sheet
INA128U/2K5G4.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 7000
  • Unit Price: $17.188
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $17.188 $17.19
200+ $6.652 $1,330.40
500+ $6.418 $3,209.00
1000+ $6.302 $6,302.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

INA128U/2K5G4 Tech Specifications
Texas Instruments - INA128U/2K5G4 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - INA128U/2K5G4

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply Span (Min) 4.5 V
Voltage - Supply Span (Max) 36 V
Voltage - Input Offset 10 µV
Supplier Device Package 8-SOIC
Slew Rate 4V/µs
Series -
Package / Case 8-SOIC (0.154", 3.90mm Width)
Package Tape & Reel (TR)
Output Type -
Product Attribute Attribute Value
Operating Temperature -40°C ~ 85°C
Number of Circuits 1
Mounting Type Surface Mount
Current - Supply 700µA
Current - Output / Channel 15 mA
Current - Input Bias 2 nA
Base Product Number INA128
Amplifier Type Instrumentation
-3db Bandwidth 1.3 MHz

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99

Parts Introduction

INA128U/2K5G4 Image
INA128U/2K5G4 (1)

Manufacturer Part Number

INA128U/2K5G4

Manufacturer

Texas Instruments

Introduction

High-Precision Instrumentation Amplifier

Product Features and Performance

Low Offset Voltage: 10 μV

Low Bias Current: 2 nA

High Common-Mode Rejection Ratio (CMRR): 100 dB

Wide Power Supply Range: 4.5 V to 36 V

Low Quiescent Current: 700 μA

High Slew Rate: 4 V/μs

Wide Bandwidth: 1.3 MHz (-3 dB)

Excellent Gain Linearity

Product Advantages

Ideal for high-precision measurement applications

Excellent performance in noise-prone environments

Versatile design for various instrumentation and control systems

Key Technical Parameters

Manufacturer Part Number: INA128U/2K5G4

Package: 8-SOIC (0.154", 3.90mm Width)

Mounting Type: Surface Mount

Operating Temperature: -40°C to 85°C

Supply Voltage Range: 4.5 V to 36 V

Quiescent Current: 700 μA

Slew Rate: 4 V/μs

Input Offset Voltage: 10 μV

Input Bias Current: 2 nA

Bandwidth: 1.3 MHz (-3 dB)

Output Current: 15 mA

Quality and Safety Features

RoHS3 Compliant

Reliable performance in various operating conditions

Compatibility

Suitable for a wide range of instrumentation and control applications

Application Areas

Precision measurement and control systems

Industrial automation and process control

Medical equipment

Test and measurement equipment

Product Lifecycle

Current product offering from Texas Instruments

Replacements and upgrades may be available in the future

Several Key Reasons to Choose This Product

Excellent precision and low noise performance

Wide supply voltage range for versatile applications

High common-mode rejection ratio for noise-prone environments

Fast slew rate and wide bandwidth for dynamic applications

Compact surface-mount package for space-constrained designs

RoHS compliance for use in environmentally-friendly applications

Frequently Asked Questions(FAQ)

How does the INA128U/2K5G4 instrumentation amplifier handle common-mode rejection in precision sensor applications, and what design considerations are critical when operating near its specified input offset voltage of 10 µV?
The INA128U/2K5G4 achieves a high common-mode rejection ratio (CMRR) essential for rejecting noise and interference in differential signal chains, such as strain gauge or thermocouple measurements. With an input offset voltage of just 10 µV, it enables millivolt-level signal resolution without requiring external nulling circuits. However, achieving this performance demands careful PCB layout—minimizing parasitic capacitance, using guard rings around sensitive traces, and ensuring symmetrical trace lengths between inverting and non-inverting inputs. In industrial environments with large ground loops or switching power supplies, the amplifier’s 36 V supply range supports robust operation but requires filtering on the supply rails to prevent degradation of CMRR.
What are the key differences between the INA128U/2K5G4 and alternative instrumentation amplifiers like the AD620BRZ-R7 in terms of bandwidth, power consumption, and dynamic range for battery-powered data acquisition systems?
Compared to the AD620BRZ-R7, the INA128U/2K5G4 offers a higher -3 dB bandwidth of 1.3 MHz versus approximately 1.2 MHz, providing slightly better transient response in fast-changing signals. However, the AD620 typically consumes less quiescent current (~1 mA), making it more suitable for ultra-low-power applications. The INA128U/2K5G4 draws 700 µA, which still represents moderate power efficiency but falls short of newer low-power alternatives. For high-resolution applications requiring low drift over temperature, the INA128’s lower input offset voltage (10 µV vs. ~50 µV typical for the AD620) may justify its use despite higher current draw. Designers must balance these trade-offs based on system requirements.
Can the INA128U/2K5G4 reliably drive capacitive loads, and what limitations apply when interfacing with long cables or digital-to-analog converters that exhibit significant output capacitance?
While the INA128U/2K5G4 can drive moderate capacitive loads due to its internal compensation, driving heavy capacitances—such as those from long unshielded cables exceeding 100 pF or certain DAC outputs—can lead to instability or oscillation. The amplifier’s slew rate of 4 V/µs limits how quickly it can respond to rapid transitions under capacitive loading, potentially distorting fast edges. To ensure stability, designers should add a small series resistor (typically 10–100 Ω) at the output before any capacitive load. This isolation resistor, combined with proper feedback network tuning, prevents phase margin degradation and maintains consistent gain accuracy across the 1.3 MHz bandwidth.
How does the INA128U/2K5G4 perform in single-supply configurations, and what biasing techniques are recommended to maintain input signal integrity within its specified operating voltage range?
The INA128U/2K5G4 supports single-supply operation down to 4.5 V, making it compatible with modern 5 V or even 3.3 V logic systems. To preserve full dynamic range, especially with unipolar sensors like RTDs or photodiodes, the input common-mode voltage must remain within 0.3 V of either rail. A resistive divider from V+ to GND creates a stable mid-supply bias (e.g., 2.5 V for a 5 V supply), which is then coupled into the inputs via DC-blocking capacitors. Proper decoupling of the bias network with a 100 nF ceramic capacitor close to the amplifier ensures low impedance and minimizes noise coupling into the signal path.
What impact does temperature variation have on the gain accuracy of the INA128U/2K5G4, and how should calibration routines be structured to compensate for drift in high-precision measurement applications?
Over its commercial temperature range (-40°C to +85°C), the INA128U/2K5G4 exhibits minimal gain drift due to its laser-trimmed thin-film resistors and stable internal architecture. Typical gain error remains below ±0.05% across temperature, assuming fixed resistor values in the external gain-setting network. However, if the RG resistor has a higher TCR than the internal resistors, gain error can increase by several hundred parts per million per degree Celsius. Therefore, selecting a low-TCR metal foil or precision resistor for RG (e.g., Vishay Z201 or similar) significantly improves thermal stability. Calibration at two temperatures (e.g., room temp and max operating) allows linear interpolation to correct residual errors in real-world deployments.
Why might someone choose the INA128U/2K5G4 over newer zero-drift alternatives, and under what conditions does its traditional architecture still provide measurable advantages?
Although zero-drift amplifiers offer superior DC precision over time, the INA128U/2K5G4 remains advantageous in applications where cost, availability, or legacy compatibility outweigh long-term drift concerns. Its well-understood behavior, robust package options, and extensive reference designs make it ideal for industrial condition monitoring or test equipment where infrequent recalibration is feasible. Additionally, in systems with strong signal averaging or digital correction algorithms, initial offset errors become less critical. The INA128’s 1.3 MHz bandwidth also outperforms most zero-drift types, benefiting dynamic signal capture without sacrificing speed.
How should the gain-setting resistor be selected for the INA128U/2K5G4 to achieve precise gains between 1 and 1000 while maintaining high linearity and minimizing parasitic effects?
Gain is set via an external resistor (RG) connected between pins 1 and 8, with the formula Gain = 5(1 + RG/RG_internal), where RG_internal ≈ 49.4 kΩ. For gains above 10, RG should be ≤10 kΩ to minimize noise contribution and improve CMRR. Use a four-terminal sensing layout with Kelvin connections if possible, though standard PCB traces suffice for most applications. Avoid long leads or vias near RG, as stray capacitance can introduce peaking or instability. For gains requiring high precision (e.g., <0.1%), use a 0.1% tolerance metal film resistor with low temperature coefficient (TCR <5 ppm/°C) and verify actual gain with calibrated instrumentation before finalizing the design.
What precautions are necessary when cascading the INA128U/2K5G4 with a second-stage filter or ADC to avoid degrading its already limited output swing and settling behavior?
The INA128U/2K5G4 delivers up to ±15 mA output current but has limited output swing headroom near supply rails—typically 100 mV below V+ and 200 mV above GND at 25°C. When driving RC filters or ADC inputs, ensure the load does not cause excessive droop or slow settling due to RC time constants exceeding the amplifier’s 0.1% settling time (≈1 µs at unity gain). Place the filter close to the amplifier to reduce trace inductance and capacitance. For anti-aliasing filters, consider buffering the output with a low-input-bias-current op-amp if the ADC has high source impedance, preserving both signal integrity and amplifier stability.
How does the Moisture Sensitivity Level (MSL) of 3 for the INA128U/2K5G4 influence assembly process planning, and what steps should be taken during reflow soldering to prevent damage?
As an MSL 3 component with a floor life of 168 hours, the INA128U/2K5G4 must be stored in dry ambient conditions (humidity <10%) and used within 7 days after opening the moisture barrier bag unless baked. During reflow, adhere strictly to the JEDEC J-STD-020 profile: peak temperature ≤260°C for ≤10 seconds. Prolonged exposure above 250°C risks delamination or bond wire lift due to internal moisture expansion. Implement nitrogen reflow or bake-out cycles (>4 hours at 125°C) if rework is needed after humidity exposure. These measures preserve hermeticity and long-term reliability in harsh environments.
In what scenarios would substituting the INA128U/2K5G4 with LT1167CS8-1#PBF or AD621ARZ compromise system performance, and how do their specifications compare in terms of noise, power, and integration flexibility?
Substituting with LT1167CS8-1#PBF trades the INA128U/2K5G4’s moderate bandwidth (1.3 MHz) for higher gain-bandwidth product (up to 10 MHz) but at the cost of increased noise density (≈9 nV/√Hz vs. 8 nV/√Hz for INA128) and higher quiescent current (~1.2 mA). The AD621ARZ offers lower noise (≈5 nV/√Hz) and lower offset (≈5 µV), but lacks the INA128’s rail-to-rail output swing capability and has narrower supply range (2.7–10 V). Choosing LT1167 suits high-speed applications but increases power budget; AD621 benefits ultra-low-voltage systems but may require level shifting in 5 V domains. Neither matches the INA128’s combination of speed, voltage range, and ease of use in general-purpose instrumentation.
How does the INA128U/2K5G4 handle electromagnetic interference (EMI) in electrically noisy environments, and what layout strategies maximize its immunity without adding external filtering components?
The INA128U/2K5G4 inherently resists EMI through its high CMRR (>100 dB at DC) and differential input topology, but external factors dominate real-world performance. To maximize immunity, route input traces differentially with matched impedance (ideally 100 Ω) and keep them short. Use ground planes beneath the amplifier and adjacent layers to shield against radiated fields. Avoid parallel routing with high-speed digital lines. Decouple V+ and GND with 0.1 µF ceramic capacitors placed within 5 mm of the IC. If conducted noise is severe, add ferrite beads on supply lines post-decoupling, but verify they don’t limit the amplifier’s transient response during fast load steps.
What role does the internal compensation capacitor play in the INA128U/2K5G4, and how can improper external capacitance affect phase margin and stability across different gain settings?
The INA128U/2K5G4 features internal frequency compensation tuned for unity-gain stability, allowing stable operation at gains ≥1 without external components. Introducing additional capacitance at the output—such as from long cables or ADC inputs—shifts the dominant pole lower, reducing phase margin and risking oscillation, especially at unity gain. At higher gains, the closed-loop bandwidth decreases, so added capacitance exacerbates settling issues. To mitigate, minimize stray capacitance by keeping output traces short and avoiding vias. If necessary, insert a small series resistor (≤50 Ω) to isolate the amplifier from capacitive loads, restoring phase margin while preserving bandwidth.
How does the INA128U/2K5G4 support diagnostic monitoring in industrial control systems, and what fault-detection mechanisms can leverage its built-in features?
Though lacking overt fault flags, the INA128U/2K5G4 enables indirect diagnostics through supply current monitoring and output saturation detection. Anomalously high quiescent current (beyond 1 mA) may indicate internal failure or shorted inputs. Similarly, persistent output clipping suggests open sensors or broken signal paths. By sampling the output with a microcontroller ADC and comparing against expected ranges, designers can infer sensor health or wiring integrity. Coupled with periodic self-test routines (e.g., injecting known offsets via relayed signals), this approach provides robust condition monitoring without requiring additional hardware beyond basic I/O.
What considerations apply when integrating the INA128U/2K5G4 into a multi-channel data acquisition system, and how does crosstalk between channels impact overall measurement accuracy?
In multi-channel setups, sharing a common reference or power rail can couple noise between channels via substrate injection or PSRR degradation. Each INA128U/2K5G4 should have independent decoupling networks with dedicated 0.1 µF caps near each IC. Isolate input paths with guard rings or physical spacing >5× trace width. Crosstalk manifests as correlated errors in adjacent channels, particularly noticeable in high-impedance sources like bridge sensors. Using separate analog grounds tied at a single star point reduces ground loop interactions. For critical applications, dedicate one channel per amplifier rather than multiplexing inputs through switches, preserving CMRR and linearity.
How does the INA128U/2K5G4 compare to integrated front-end solutions like the TI PGA309 in terms of flexibility, power, and suitability for space-constrained portable medical devices?
Unlike the PGA309, which combines programmable gain, filtering, and ADC interface in a single chip, the INA128U/2K5G4 offers greater flexibility for custom signal conditioning but requires discrete filtering and ADC stages. The PGA309 consumes less power (~1 mA total) and integrates digital control, saving board space—advantageous in wearables or implantables. However, the INA128’s 36 V supply range and higher output drive suit industrial or bench-top instruments where analog customization dominates. For portable devices prioritizing size and integration, PGA309 wins; for legacy-compatible, high-voltage analog front-ends, INA128U/2K5G4 remains compelling.
What testing methodology ensures the INA128U/2K5G4 meets required specifications in production environments without requiring expensive lab equipment?
Functional tests can validate key parameters using minimal resources: measure offset voltage by shorting inputs and measuring output (should be near zero); verify gain accuracy with a known reference voltage (e.g., 1 V) and check output against expected value; confirm bandwidth by injecting a square wave and observing rise time (target <150 ns for 10%-90%). Supply current draw should remain near 700 µA. For CMRR, apply a common-mode signal and measure attenuation relative to differential input. These tests, combined with visual inspection for solder defects, provide sufficient confidence for most production scenarios without full parametric characterization.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments INA128U/2K5G4

Product Attribute INA128UA/2K5G4 INA128UA/2K5E4 INA128U/2K5 INA128UA/2K5
Part Number INA128UA/2K5G4 INA128UA/2K5E4 INA128U/2K5 INA128UA/2K5
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Slew Rate - - - -
Current - Output / Channel - - - -
Amplifier Type - - - -
Voltage - Supply Span (Min) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Voltage - Input Offset - - - -
Series - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Supply - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Number of Circuits - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Base Product Number - DAC34H84 MAX500 ADS62P42
Voltage - Supply Span (Max) - - - -
-3db Bandwidth - - - -
Current - Input Bias - - - -

INA128U/2K5G4 Datasheet PDF

Download INA128U/2K5G4 pdf datasheets and Texas Instruments documentation for INA128U/2K5G4 - Texas Instruments.

PCN Design/Specification
INA128/INA129 29/May/2019.pdf INA12x 03/Aug/2022.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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INA128U/2K5G4 Image

INA128U/2K5G4

Texas Instruments
32D-INA128U/2K5G4

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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