Texas Instruments INA118PB: Ultimate Guide to the Precision Instrumentation Amplifier

Comprehensive Product Overview

The INA118PB from Texas Instruments represents the gold standard in precision instrumentation amplifiers, combining exceptional electrical characteristics with robust physical packaging. This detailed guide explores every aspect of this industry-leading IC to help engineers make informed design decisions.

Manufacturer Background

• Manufacturer: Texas Instruments (NASDAQ: TXN)
• Part Number: INA118PB
• Product Line: Precision Instrumentation Amplifiers

Texas Instruments, founded in 1930, has consistently delivered cutting-edge semiconductor solutions. The INA118PB continues this tradition with its optimized design for precision measurement applications across multiple industries.

In-Depth Technical Specifications

Core Electrical Characteristics

Parameter	Value	Industry Comparison
Input Bias Current	1nA (typ)	5-10x better than standard instrumentation amps
Input Offset Voltage	10 V (max)	Exceptional for cost-competitive devices
Bandwidth (-3dB)	800kHz	Ideal for most industrial measurement needs
CMRR	110dB (min at G=100)	Superior noise rejection

Power Management Features

The INA118PB's wide 2.7V to 36V supply range enables operation in diverse environments:

• Low-Power Mode: 350 A quiescent current enables battery-powered operation
• Dual Supply Capability: 1.35V to 18V operation
• Output Swing: Rail-to-rail within 1.1V of supplies

Package Options and Physical Dimensions

The through-hole 8-PDIP package (7.62mm width) offers:

• Standard DIP footprint for easy prototyping
• -40 C to +85 C industrial temperature range
• Tin/Lead (Sn/Pb) plating option available

Practical Applications

Medical Equipment

The INA118PB excels in biomedical applications:

• ECG/EEG signal conditioning
• Patient monitoring systems
• Portable medical devices

Industrial Systems

Industrial implementations include:

• 4-20mA current loop receivers
• Strain gauge amplifiers
• Process control instrumentation

Test and Measurement

Laboratory applications benefit from:

• Precision data acquisition
• Sensor signal conditioning
• Bridge amplifier circuits

Design Considerations

Gain Configuration

The INA118PB provides external gain setting via a single resistor:

Gain Equation: G = 1 + (50k /R_G)

Recommended gain range: 1 to 10,000

Noise Reduction Techniques

For optimal performance:

• Use 0.1 F bypass capacitors near supply pins
• Implement proper PCB grounding techniques
• Consider shielding for high-impedance inputs

Competitive Advantages

Performance Comparison

Compared to similar instrumentation amplifiers:

• Lower power consumption than INA128
• Better CMRR than AD620 at equivalent gains
• More stable over temperature than LM363

Cost-Benefit Analysis

The INA118PB delivers:

• 30% better performance/price ratio than premium alternatives
• Reduced BOM costs through single-chip solution
• Long-term reliability minimizing replacement costs

Purchasing Information

Available through authorized distributors:

• Standard lead time: 6-8 weeks
• MOQ: 100 pieces
• Packaging options: Tube (50 units) or Tape & Reel (2,500 units)

Conclusion

The Texas Instruments INA118PB instrumentation amplifier sets the benchmark for precision analog signal conditioning. Its combination of ultra-low noise, wide dynamic range, and flexible power requirements make it the ideal choice for engineers designing critical measurement systems across medical, industrial, and scientific applications.

For design support, reference designs, and volume pricing, contact our technical sales team today. Download the complete INA118PB datasheet for detailed specifications and application circuits.