INA128UA/2K5

Precision instrumentation amplifier, 3-op-amp, G=1-10000, 120dB CMRR, 700µA, SOIC-8, TI INA128

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Manufacturer Part：

INA128UA/2K5

Package：

8-Pin SOIC (SO-8), 4.9mm x 3.9mm

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Description

Product Overview

The INA128UA/2K5 is a precision, low-power instrumentation amplifier from Texas Instruments, featuring a classic 3-op-amp architecture with current-feedback inputs for wide bandwidth even at high gain. This versatile in-amp offers excellent accuracy with laser-trimmed offset voltage (50µV max), low drift (0.5µV/°C max), and high common-mode rejection ratio (120dB min at G ≥ 100). Gain is set from 1 to 10,000 with a single external resistor, using the industry-standard gain equation G = 1 + 50kΩ/R_G. Operating on only 700µA of quiescent current with supply voltages from ±2.25V to ±18V, the INA128 is ideal for battery-powered and portable instrumentation. It is available in an 8-pin SOIC package rated for -40°C to +125°C operation.

Key Specifications

Parameter Value
Manufacturer Texas Instruments
Type Instrumentation Amplifier (In-Amp)
Architecture 3-Op-Amp, Current-Feedback Input
Gain Range 1 to 10,000 V/V
Gain Equation G = 1 + (50kΩ / R_G)
Offset Voltage (max) 50 µV (INA128U grade)
Offset Drift (max) 0.5 µV/°C
CMRR (min) 120 dB at G ≥ 100
Input Bias Current 5nA max, 0.7nA max (FRE grade)
Bandwidth (G=1) 1.3 MHz
Bandwidth (G=100) 200 kHz
Slew Rate 4 V/µs
Supply Voltage ±2.25V to ±18V (4.5V to 36V single-supply)
Quiescent Current 700 µA typ
Input Protection ±40V continuous
Package 8-Pin SOIC (SO-8)
Operating Temperature -40°C to +125°C

Features

  • Low offset voltage: 50µV maximum (laser trimmed)
  • Low offset drift: 0.5µV/°C maximum
  • High common-mode rejection ratio: 120dB min at G ≥ 100
  • Wide bandwidth: 1.3MHz at G=1, 200kHz at G=100
  • Low input bias current: 5nA maximum
  • Low noise: 8nV/√Hz, 0.2µVpp (0.1-10Hz)
  • Single resistor gain set: 1 to 10,000
  • Wide supply range: ±2.25V to ±18V
  • Low quiescent current: 700µA typical
  • ±40V input overvoltage protection
  • Industry-standard gain equation (G = 1 + 50k/R_G)
  • Reference pin for output offset adjustment
  • Available in DIP-8 and SOIC-8 packages

Applications

  • Bridge amplifiers (strain gauges, load cells, pressure sensors)
  • Thermocouple and RTD signal conditioning
  • Data acquisition systems
  • Medical instrumentation
  • Industrial process control
  • Differential signal amplification
  • Current sensing with shunt resistors
  • Battery-powered portable instrumentation
  • Audio preamplifiers and microphone buffers

The INA128UA/2K5 from Texas Instruments is a high-precision, low-power instrumentation amplifier designed for accurate differential signal amplification in measurement and instrumentation applications. Built around a classic 3-op-amp topology with current-feedback input stages, it delivers wide bandwidth even at high gains — 200kHz at gain of 100 — outperforming traditional voltage-feedback instrumentation amplifiers. Gain is programmed from 1 to 10,000 using a single external resistor, following the industry-standard formula G = 1 + 50kΩ/R_G, which simplifies design and provides drop-in compatibility with existing systems. Laser wafer trimming ensures tight specifications: 50µV maximum offset voltage, 0.5µV/°C maximum drift, and 120dB minimum common-mode rejection at gains of 100 and above. Operating on just 700µA of quiescent current and accepting supply voltages from ±2.25V to ±18V, the INA128 is well-suited for both single-supply and split-supply operation, making it ideal for battery-powered portable equipment. Built-in ±40V input overvoltage protection protects against fault conditions without external components.

The INA128 uses a 3-op-amp instrumentation amplifier architecture. The input stage consists of two op-amps (A1, A2) configured as differential amplifiers with current-feedback inputs. This input stage amplifies the differential voltage V_IN = V_IN+ – V_IN- while maintaining high input impedance. The gain of the first stage is set by the external resistor R_G connected between the two gain-setting pins, per the formula G_stage1 = 1 + 2*(25kΩ)/R_G. The second stage (op-amp A3) is a differential amplifier that converts the differential signal from the first stage to a single-ended output referenced to the REF pin. The overall gain is G = 1 + 50kΩ/R_G. The current-feedback topology of the input stage provides wider bandwidth at higher gains compared to voltage-feedback designs, because the gain-bandwidth product effectively increases with gain. The REF pin allows the user to set the output reference voltage, enabling level shifting and single-supply operation. Internal 25kΩ series resistors at each input provide overvoltage protection up to ±40V by limiting fault current.

Pin Name Description
1 RG Gain setting resistor terminal 1
2 VIN- Inverting (negative) differential input
3 VIN+ Non-inverting (positive) differential input
4 V- Negative supply voltage
5 REF Reference voltage (output offset adjust)
6 VOUT Amplifier output
7 V+ Positive supply voltage
8 RG Gain setting resistor terminal 2
  • Wheatstone bridge amplifiers for load cells, pressure sensors, and strain gauges
  • Thermocouple and RTD temperature measurement front-ends
  • Data acquisition (DAQ) systems and precision measurement instruments
  • Medical equipment: ECG, EEG, patient monitoring devices
  • Industrial process control and factory automation
  • High-side and low-side current sensing with shunt resistors
  • Differential line receivers and signal conditioning
  • Battery-powered portable test and measurement equipment
  • Audio preamplifiers for microphones and sensors
Model Manufacturer Gain Range CMRR Package
INA129UA TI 1-10000 120dB SOIC-8 (AD620-compatible)
AD620 ADI 1-10000 130dB SOIC-8
INA828 TI 1-10000 140dB SOIC-8 (improved version)
MCP6N16 Microchip 1-10000 100dB MSOP-8
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Quality Assurance

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
  • Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
  • Medical Devices: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
  • Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.

4. Professional Reliability Control

For static-sensitive, moisture-sensitive and precision components such as ICs, PCBs, sensors and connectors, we carry out reliability screening in advance. Combined with standardized ESD anti-static packaging and vacuum moisture-proof packaging, we avoid component damage caused by static electricity, dampness or collision during storage and transportation, and retain the original performance of products.

5. Traceability Management System

We establish a complete product traceability system. Each batch of goods corresponds to independent batch number, sourcing record, inspection record and delivery record. Customers can query the whole lifecycle information of components at any time. This system effectively solves quality risks and facilitates after-sales handling and production quality control for your company.

6. After-sales Quality Guarantee

If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

Contact Us

If you have inquiries about our quality standards, inspection procedures or product certification documents, please feel free to contact us:

 

Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

Shipping & Payment

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

1. Payment Terms

We offer a variety of secure and convenient payment methods to meet diverse business cooperation needs. Details are as follows:
  1. Accepted Payment Methods
  • T/T (Bank Wire Transfer): The primary settlement method for bulk orders and a widely used international payment channel.
  • PayPal: Ideal for small orders, sample orders and quick payments.

  1. Settlement Currency

     

    US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.

  2. Bank Charges

     

    All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.

  3. Payment Requirements
  • Sample and small orders: Shipment will be arranged upon full payment.
  • In-stock bulk orders: Goods will be delivered within 2 to 3 working days after full payment.

2. Shipping & Delivery

We partner with leading global logistics providers to ensure safe and fast delivery worldwide. Relevant details are listed below:
  1. Logistics Partners
  • International Express: DHL, FedEx, UPS, TNT
  • Economy Logistics: Air freight and sea freight for large-volume cargo
  • Domestic Delivery: SF Express, Yunda Express
  1. Order Processing Time
  • In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
  • Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
  1. Estimated Transit Time
  • International Express: 3 – 7 working days globally
  • Air Freight: 7 – 12 working days
  • Sea Freight: 25 – 40 working days for heavy and large bulk cargo
  1. Shipping Fee Rules
  • Shipping cost is calculated based on package weight, volume, destination and delivery method.
  • Both freight prepaid and freight collect are available. Please provide your courier account number in advance if you choose freight collect.
  • Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
  1. Shipment Tracking
     

    Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.

3. General Order Rules & Notes

  1. MOQ & Sample Service

     

    We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.

  2. Packaging Standard

     

    All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.

4. Customs & Liability Statement

  1. Import Duties & Taxes

     

    All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.

  2. Handling of Lost or Damaged Goods
  • In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
  • We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.

5. Local Pickup in Shenzhen

Local pickup service is available for customers in Shenzhen and surrounding areas:
  • Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
  • Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
  • Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.

Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

1. One-stop Sourcing & BOM Support

We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

  • All components are packed separately to avoid damage caused by friction and collision;
  • Shockproof buffer materials are added for fragile products to ensure transportation safety;
  • Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.

2. Classified Professional Packaging

  • Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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