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Texas Instruments INA128UG4
- Part No.:
- INA128UG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA128UG4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,013
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Product details
Overview
INA128UG4 from Texas Instruments is a precision, low-power instrumentation amplifier designed for high-accuracy differential signal conditioning in noisy industrial and medical environments. It delivers 50μV maximum offset voltage, 0.5μV/°C max drift, 120dB minimum CMRR at G=100, 1.3MHz bandwidth (G=1), and ±40V input overvoltage protection - enabling reliable operation in pressure transmitters and ECG front-ends.
For engineers reviewing the INA128UG4 datasheet, INA128UG4 pinout, INA128UG4 application, or INA128UG4 equivalent, key selection criteria include its laser-trimmed gain accuracy (±0.024% at G=1), SOIC-8 package compatibility with legacy layouts, dual-supply operation down to ±2.25V, and verified performance across –40°C to +85°C.
Technical Context
The INA128UG4 implements a three-op-amp architecture with current-feedback input stages, enabling stable 200kHz bandwidth even at G=100. Its gain is set by a single external resistor between pins 1 and 8 using the equation G = 1 + 50kΩ/RG, matching industry-standard configurations for drop-in replacement in existing designs.
Input protection circuitry clamps transient voltages up to ±40V without damage, while laser trimming ensures 120dB CMRR at G=100 and 8nV/√Hz input-referred voltage noise (1kHz, CSO:SHE). The device operates from ±2.25V to ±18V supplies with only 700μA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 50μV max - enables sub-100μV system-level DC error in weigh scale bridges |
| CMRR | 120dB min at G=100 - rejects >99.9999% of common-mode interference in ECG leads |
| Bandwidth | 1.3MHz at G=1 - supports fast step response in analog input modules sampling at ≥200ksps |
| Input Protection | ±40V absolute max - eliminates need for external TVS diodes in industrial sensor interfaces |
| Quiescent Current | 700μA - allows battery-powered DAQ systems to achieve multi-year runtime |
| Supply Range | ±2.25V to ±18V - interoperates with legacy ±5V, ±12V, and ±15V industrial rails |
| Gain Equation | G = 1 + 50kΩ/RG - matches standard reference designs and simplifies BOM consolidation |
Pinout & Package
INA128UG4 is supplied in an 8-pin SOIC (D) package measuring 4.9mm × 6mm, with gull-wing leads and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG (Gain Set) | Resistor connection points defining gain per G = 1 + 50kΩ/RG; open-circuit yields G=1 |
| 2 | VIN– | Inverting input terminal; high-impedance (10GΩ || 2pF) for direct bridge sensor connection |
| 3 | VIN+ | Non-inverting input terminal; matched to VIN– for optimal CMRR performance |
| 4 | V– | Negative supply rail; must be decoupled locally to maintain PSRR >100dB |
| 5 | REF | Output reference node; requires low-impedance ground path to preserve CMRR |
| 6 | VO | Differential output; swings to within 1.4V of rails (CSO:SHE) under 10kΩ load |
| 7 | V+ | Positive supply rail; accepts bypass capacitor up to 1000pF for stability |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset | 50μV max ensures <0.1% gain error in 50mV full-scale sensor outputs |
| Overvoltage-protected inputs | ±40V tolerance eliminates external clamping components in 24V industrial I/O |
| Low-noise architecture | 8nV/√Hz @1kHz enables 16-bit effective resolution in 100ksps DAQ systems |
| Wide supply range | ±2.25V operation supports ultra-low-power portable medical devices |
| Industry-standard gain equation | G = 1 + 50kΩ/RG simplifies design reuse and reduces qualification time |
Applications
| Pressure Transmitter | Electrocardiogram (ECG) |
|---|---|
Use Scenario: Amplifying mV-level output from silicon piezoresistive pressure sensors in HVAC and process control systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and input protection before ADC sampling. Use Value: 120dB CMRR suppresses 60Hz line noise induced in long sensor cables, while ±40V input tolerance withstands field wiring faults. | Use Scenario: Front-end amplification of microvolt-level cardiac signals in patient-worn ECG monitors. IC Role / Device Role / Timing Role: Differential signal conditioner rejecting electrode contact noise and power-line interference before filtering and digitization. Use Value: 50μV max offset prevents baseline drift during 24-hour monitoring, and 0.2μVpp low-frequency noise preserves P/QRS/T wave morphology. |
| Weigh Scale | Analog Input Module |
Use Scenario: Signal conditioning for full-bridge load cells in industrial weighing platforms and checkweighers. IC Role / Device Role / Timing Role: High-precision gain stage converting 2–20mV bridge output to 0–5V/0–10V industrial standard ranges. Use Value: Laser-trimmed gain accuracy (±0.024% at G=1) ensures NTEP Class III compliance without periodic recalibration. | Use Scenario: Universal analog input channel in PLC backplanes accepting thermocouple, RTD, and 4–20mA signals. IC Role / Device Role / Timing Role: Configurable instrumentation amplifier supporting multiple sensor types via software-selectable RG values. Use Value: Single-resistor gain programming (G=1 to 10,000) reduces component count versus fixed-gain alternatives and enables field reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128U | Same SOIC-8 package and pinout; identical electrical specs but not enhanced green (RoHS-compliant) variant | No difference in functional use; differs only in material composition and marking | Select INA128U if RoHS exemption applies or legacy inventory reuse is required |
| INA129U | Uses G = 1 + 49.4kΩ/RG equation; otherwise identical offset, noise, and CMRR performance | Enables drop-in replacement for legacy designs using 49.4kΩ-based gain networks | Choose INA129U when migrating from older TI instrumentation amps with 49.4kΩ reference resistors |
Compared with INA128U and INA129U, the INA128UG4 provides identical precision performance and SOIC-8 compatibility while meeting current environmental compliance standards - making it the preferred choice for new designs requiring RoHS conformance without sacrificing legacy design continuity.
Availability
INA128UG4 is available at Aetrix Electronics and suitable for pressure transmitter, ECG monitor, and industrial analog input module designs requiring stable component supply, long-term manufacturability, and guaranteed RoHS compliance.
Supply support for INA128UG4 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 INA12x family was engineered specifically for high-accuracy industrial and medical sensor signal conditioning, emphasizing low drift, robust input protection, and flexible gain configuration in compact packages.
FAQ
What is the maximum gain achievable with INA128UG4?
The INA128UG4 supports gains from 1 to 10,000 using an external resistor between pins 1 and 8 per the equation G = 1 + 50kΩ/RG. At G=10,000, RG = 5Ω; however, layout parasitics and resistor tolerance require careful PCB design. The INA128UG4 maintains usable bandwidth (20kHz) and CMRR (>110dB) even at G=1000, making it suitable for high-resolution strain gauge applications.
Does INA128UG4 require external capacitors for stability?
The INA128UG4 is internally compensated and stable with capacitive loads up to 1000pF. For optimal high-frequency performance, place 0.1μF ceramic decoupling capacitors between V+ (pin 7) and V– (pin 4) close to the device. No external compensation network is needed, unlike some discrete op-amp based instrumentation amplifier implementations.
How does the REF pin affect INA128UG4 output behavior?
The REF pin (pin 5) sets the output voltage offset; when grounded, the output centers at 0V for zero differential input. Driving REF with a DC voltage level shifts the entire output range accordingly - enabling bipolar-to-unipolar conversion or level-shifting for ADC interfacing. A series resistance >8Ω degrades CMRR to ~80dB, so low-impedance drive is essential.
Can INA128UG4 operate from a single supply?
Yes, the INA128UG4 supports single-supply operation from 4.5V to 36V. When using single-ended supplies, connect V– (pin 4) to ground and ensure the input common-mode voltage stays within (V–)+2V to (V+)–2V. Output swing remains rail-to-rail limited (e.g., 0.15V to 4.85V on 5V supply, CSO:FRE), requiring proper biasing for AC-coupled sensor signals.
What is the temperature range specification for INA128UG4?
The INA128UG4 is specified for operation from –40°C to +85°C ambient temperature. Electrical characteristics including offset drift (0.5μV/°C max), CMRR (120dB min at G=100), and quiescent current (±700μA) are guaranteed across this full industrial temperature range, ensuring reliability in uncontrolled environments like factory floors and outdoor instrumentation enclosures.
INA128UG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.3 MHz
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 700µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA128UG4 FAQ
1.How can I place an order for INA128UG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA128UG4 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 INA128UG4 reliable?
The price and inventory of INA128UG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA128UG4 is usually 5 days.
3.What payment methods are accepted for INA128UG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA128UG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA128UG4?
INA128UG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA128UG4 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 INA128UG4?
For technical support, including INA128UG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA128UG4 requirements.
6.How does Aetrix verify that INA128UG4 is sourced from the original manufacturer or authorized distributors?
All INA128UG4 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 INA128UG4 meets industry standards.
7.What is the process for return or replacement of INA128UG4?
All INA128UG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA128UG4, 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 INA128UG4 part is unused and in its original packaging.
Return procedure for INA128UG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA128UG4 Tags
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LM358DR
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