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Product Detailed Parameters
- Description：IC INST AMP 1 CIRCUIT 8SOIC
- Series：-
- Mfr：Texas Instruments
- Package：Tube
- Amplifier Type：Instrumentation
- Number of Circuits：1
- Output Type：-
- Slew Rate：0.7V/µs
- Gain Bandwidth Product：-
- Current - Input Bias：4 pA
- Voltage - Input Offset：200 µV
- Current - Supply：450µA
- Current - Output / Channel：14 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
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOIC
- -3db Bandwidth：5 kHz
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Overview
The INA121UG4 is a low-power instrumentation amplifier manufactured by Texas Instruments. It features FET-input stages to ensure high input impedance and low bias current. The device provides a fixed internal gain of 100 V/V, eliminating the need for external precision resistors. It operates within a wide supply voltage range of 4.5V to 36V or ±2.25V to ±18V. The component is housed in an 8-pin SOIC package with a G4 suffix indicating lead-free and RoHS compliance.
Feature Summary
- FET-input architecture providing high input impedance and low bias current
- Fixed internal gain of 100 V/V requiring no external feedback components
- Wide single or dual supply voltage operation capability
- Low power consumption suitable for battery-powered applications
Applications
- Strain gauge and bridge sensor signal conditioning
- Medical instrumentation and patient monitoring systems
- Industrial process control and data acquisition
- Precision test and measurement equipment
Procurement Notes
Verify the specific package variant against design requirements. Confirm that the fixed gain of 100 V/V aligns with system signal levels. Ensure supply voltages remain within the specified operational limits. Check for lead-free compliance if required by environmental regulations. Validate pinout compatibility during PCB layout integration.
Selection Notes
Select this component when a fixed gain of 100 is sufficient for the application. Choose over adjustable amplifiers to reduce external component count and cost. Consider FET-input characteristics for high-impedance sources. Evaluate power constraints against the device's low quiescent current specifications. Verify thermal performance within the operating temperature range.
Part Context
The INA121 belongs to Texas Instruments' family of low-power instrumentation amplifiers. It is designed for applications requiring high accuracy and stability. The G4 suffix denotes a lead-free and RoHS-compliant version of the standard INA121UA. This variant maintains identical electrical performance while meeting modern environmental standards for electronic components.
Replacement Considerations
The INA121U serves as the non-RoHS equivalent. The INA121UA/2K5 is a reel-packaged variant of the same device. Verify pin compatibility and gain specifications before substitution. Ensure packaging differences do not impact assembly processes.
