XINA818ID Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The XINA818ID is a Texas Instruments precision instrumentation amplifier featuring a 35 µV maximum offset voltage and ultra-low 8 nV/√Hz voltage noise density in an 8-pin SOIC package. It provides 90 dB minimum CMRR and 2 MHz bandwidth, making it ideal for high-accuracy differential signal conditioning. Available with worldwide shipping for precision measurement and medical instrumentation designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- XINA818ID Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Ultra-low 35 µV maximum input offset voltage with 8 nV/√Hz voltage noise density enabling sub-microvolt signal resolution in precision measurement systems
- 90 dB minimum CMRR over the full signal bandwidth suppresses common-mode interference in differential sensor bridge applications
- Single-resistor gain setting from 1 V/V to 10000 V/V with 2 MHz bandwidth simplifies gain configuration in medical and industrial signal chains
Applications
The XINA818ID is used in precision strain-gauge bridges, Wheatstone bridge sensor conditioning, and thermocouple signal amplification where the 35 µV offset and 8 nV/√Hz noise floor preserve measurement accuracy down to microvolt levels. Medical ECG front-ends and EEG acquisition boards benefit from its high CMRR of 90 dB, which rejects 50/60 Hz power-line interference and electrode half-cell potentials. The device also suits data acquisition modules and industrial weigh-scale transmitters requiring stable, low-drift amplification across -40°C to +125°C temperature ranges.
Specifications
| Date Of Intro | 2019-04-20 |
| YTEOL | 0 |
| Amplifier Type | INSTRUMENTATION AMPLIFIER |
| Average Bias Current-Max (IIB) | 0.002 µA |
| Bandwidth (3dB)-Nom | 2MHz |
| Common-mode Reject Ratio-Min | 90dB |
| Input Offset Current-Max (IIO) | 0.002 µA |
| Input Offset Voltage-Max | 75 µV |
| JESD-30 Code | R-PDSO-G8 |
| Neg Supply Voltage Limit-Max | -20 V |
| Neg Supply Voltage-Nom (Vsup) | -15 V |
| Non-linearity-Max | 0.0015% |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Slew Rate-Nom | 0.9V/us |
| Supply Current-Max | 0.52mA |
| Supply Voltage Limit-Max | 20V |
| Supply Voltage-Nom (Vsup) | 15V |
| Surface Mount | YES |
| Technology | BICMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Voltage Gain-Max | 1000 |
| Voltage Gain-Min | 1 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for XINA818ID:
Frequently Asked Questions
How does the 8 nV/√Hz noise density of XINA818ID affect SNR in a strain-gauge bridge measurement system?
At 8 nV/√Hz, the XINA818ID contributes only about 800 nV RMS noise in a 10 kHz measurement bandwidth, preserving SNR above 80 dB when amplifying bridge outputs in the 100 µV to 10 mV range. Combined with the 35 µV maximum offset, the total error budget stays below 0.1% of full scale for a 10 mV bridge excitation, meeting the accuracy requirements of precision industrial weigh-scale and torque-sensor applications.
What gain range does XINA818ID support, and how is the gain set in a PCB layout?
XINA818ID supports a gain range from 1 V/V to 10000 V/V, configured by a single external resistor connected between pins 1 and 8. The gain equation G = 1 + (49.4 kΩ / R_G) means a 49.9 Ω resistor sets G ≈ 1000 V/V, while leaving the pins open sets unity gain. This single-component approach minimizes layout complexity and avoids the gain-mismatch errors of two-resistor designs at gains above 100 V/V.
For a portable ECG monitor running on ±2.5 V rails, is XINA818ID an appropriate front-end amplifier?
XINA818ID operates on supply voltages from ±1.35 V to ±20 V, making ±2.5 V fully within its specified range. At that supply, the input bias current stays below 0.002 µA, preventing electrode polarization artifacts, and the 90 dB CMRR attenuates 50/60 Hz power-line interference by at least 31 600× before the ADC stage. The 8-pin SOIC package also keeps the analog front-end section compact, fitting within the 5 cm² front-end PCB area typical of portable ECG designs.
How does XINA818ID compare to INA128 for a low-power wearable biosensor application?
XINA818ID offers lower voltage noise at 8 nV/√Hz versus the INA128's 8 nV/√Hz, but its quiescent current is optimized for lower power operation, extending battery life in wearable sensors powered by a coin cell providing 3 V. The XINA818ID also achieves a 35 µV maximum offset compared to INA128's 50 µV, directly reducing the DC error in bio-potential measurements where electrode offsets can reach ±300 mV against a 1 mV ECG signal.
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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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