DEL-INA128UA Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments DEL-INA128UA is a precision instrumentation amplifier with 50 µV maximum offset voltage and gain settable from 1 to 10000 via a single external resistor in an 8-pin SOIC package. Features 90 dB minimum CMRR and wide ±2.25 V to ±18 V dual supply range for accurate differential signal amplification. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- DEL-INA128UA Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of DEL-INA128UA?
- Single external resistor sets gain from 1 to 10000 without trimming, simplifying precision signal conditioning designs in instrumentation and medical equipment
- 90 dB minimum common-mode rejection ratio (CMRR) at unity gain rejects noise and interference on differential sensor inputs such as bridge sensors and thermocouples
- 50 µV maximum input offset voltage with low drift ensures measurement accuracy in high-precision data acquisition systems over the full operating temperature range
What is DEL-INA128UA used for?
The DEL-INA128UA is designed for precision amplification of low-level differential signals from bridge sensors, thermocouples, and strain gauges in industrial measurement and medical instrumentation equipment. Its single-resistor gain setting and high CMRR make it ideal for 4-wire RTD temperature sensing circuits and ECG front-end designs where common-mode interference rejection is critical. The wide supply voltage range of ±2.25 V to ±18 V accommodates both battery-operated portable instruments and benchtop laboratory equipment using traditional ±15 V rails.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the DEL-INA128UA datasheet?
DEL-INA128UA Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for DEL-INA128UA?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How is the gain of the DEL-INA128UA set, and what range of gain values can it achieve with a single resistor?
The DEL-INA128UA sets gain with a single external resistor connected between pins 1 and 8 using the formula G = 1 + (50 kΩ / RG). Removing the resistor gives unity gain (G=1), and a 5.05 Ω resistor sets gain to approximately 10000. Common gain values include G=10 with RG = 5.56 kΩ, G=100 with RG = 505 Ω, and G=1000 with RG = 50.05 Ω, covering the full range needed for millivolt-level bridge and thermocouple signal conditioning.
What CMRR specification does the DEL-INA128UA provide, and how does it benefit strain gauge bridge measurement accuracy?
The DEL-INA128UA guarantees a minimum CMRR of 90 dB at DC and low frequencies. For a strain gauge bridge excited at 5 V in an industrial environment with 1 V of 50 Hz common-mode interference, 90 dB CMRR suppresses this interference to below 3 µV at the amplifier output. At G=1000, the resulting error is under 3 nV referred to input, which is negligible for strain gauge systems targeting 0.1% or better measurement accuracy.
What supply voltage range does the DEL-INA128UA support, and which portable and benchtop instrument configurations does it accommodate?
The DEL-INA128UA operates from ±2.25 V to ±18 V dual supply, accommodating battery-powered portable instruments running from ±3.3 V or ±5 V split rails as well as traditional benchtop equipment using ±15 V laboratory supplies. This flexibility allows a single BOM to serve both handheld field calibrators and rack-mounted data acquisition systems, with input voltage range scaling proportionally to the supply chosen.
What is the input offset voltage specification of the DEL-INA128UA, and how does it affect measurement error in a 1 mV full-scale thermocouple application?
The DEL-INA128UA has a maximum input offset voltage of 50 µV. For a Type K thermocouple with a 1 mV full-scale output (approximately 25°C range), a 50 µV offset represents a 5% full-scale error before any trim or system-level calibration. In systems requiring better than 1% accuracy, a digital offset correction via the microcontroller ADC reference or a one-point system calibration at ambient temperature reduces this error to well below 0.1%.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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