INA110SG - Fast-Settling FET-Input Amplifier | Texas Instruments
MPN: INA110SG ✓ ActiveINA110SG Overview
An instrumentation amplifier is a specialized analog amplifier designed to amplify small differential signals while rejecting large common-mode voltages. Its internal architecture provides matched input devices, high input impedance, and stable gain behavior, making it part of the broader operational-amplifier and signal-conditioning hierarchy. INA110 applications include sensor-interface circuits, bridge amplifiers, current measurement, laboratory instrumentation, and multiplexed data-acquisition systems where low bias current, high common-mode rejection, and rapid settling are important.
Internal gain resistors permit selectable gains of 1, 10, 100, 200, and 500 V/V without external feedback resistors. The laser-trimmed input stage supports high accuracy, with very low gain drift of up to 50 ppm per degree Celsius and input offset drift of 2 microvolts per degree Celsius. The low maximum bias current of 50 pA is particularly useful with high-impedance sources and electrostatic sensors. A minimum common-mode rejection of 106 dB at 10 kHz improves rejection of interference shared by both input terminals.
The INA110 uses a current-feedback architecture rather than a conventional voltage-feedback topology. This architecture supports fast settling and broad usable bandwidth, while the 2.5 MHz typical bandwidth provides useful signal bandwidth for precision measurement systems. The manufacturer identifies fast settling as especially valuable in high-speed and multiplexed-input data-acquisition systems, where insufficient settling between channel selections can create measurement errors. The INA110SG operates from dual supplies with a typical total supply of plus or minus 15 V, a minimum of plus or minus 6 V, and a maximum of plus or minus 18 V.
Typical applications include low-current sensor amplification, precision bridge excitation and readout, isolated or high-impedance measurement front ends, portable instrumentation, and multi-channel acquisition systems. The low bias current helps preserve sensor accuracy, while the 106 dB common-mode rejection helps suppress noise and power-supply-related disturbances appearing equally on both inputs. The 4-microsecond settling specification is valuable when many input channels must be sampled rapidly.
Designers should verify supply polarity, common-mode range, gain selection, input protection, and output swing against the manufacturer datasheet before finalizing the analog path. Instrumentation-amplifier layouts should use short input traces, guard techniques for high-impedance nodes, and symmetric routing to minimize parasitic imbalance. Decoupling capacitors should be placed close to the supply pins, while unused gain-select pins must be connected according to the recommended configuration for the intended gain.
This product overview combines the INA110SG architecture, verified performance characteristics, application guidance, package constraints, and drop-in alternatives into an engineering-focused reference. It also highlights the trade-offs involved when replacing a military-temperature ceramic CDIP with a lower-temperature plastic or ceramic DIP implementation.
Drop-in alternatives for INA110SG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
INA110KP
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →INA110BG
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
INA110UA
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
INA110SG Maximum Ratings & Electrical Characteristics
| Amplifier Type | Instrumentation amplifier |
| Channel Count | 1 channel |
| Input Type | FET input |
| Topology | Current feedback |
| Internal Gain Settings | 1, 10, 100, 200, and 500 V/V |
| Settling Time to 0.01% | 4 microseconds |
| Typical Bandwidth | 2.5 MHz |
| Maximum Input Bias Current | 50 pA |
| Minimum Common-Mode Rejection | 106 dB at 10 kHz |
| Maximum Gain Drift | 50 ppm/degree Celsius |
| Maximum Offset Drift | 2 microvolts/degree Celsius |
| Typical Supply Voltage | Plus or minus 15 V |
| Minimum Supply Voltage | Plus or minus 6 V |
| Maximum Supply Voltage | Plus or minus 18 V |
| Operating Temperature Range | -55 degrees Celsius to +125 degrees Celsius |
| Package | 16-CDIP |
| Mounting Type | Through hole |
INA110SG 16-cdip Pin Configuration Guide
Pin configuration for INA110SG (16-cdip package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for INA110SG.
Refer to the datasheet for full pin configuration.
Typical Applications
INA110SG is suitable for 6 applications: High-Impedance Sensor Signal Conditioning, Multiplexed Data-Acquisition Systems, Precision Bridge Amplifier, Current-Shunt Measurement, Laboratory Measurement Instrumentation, Multichannel Industrial Sensor Acquisition.
High-Impedance Sensor Signal Conditioning
The INA110SG suits low-current sensor front ends because its maximum input bias current is 50 pA and its FET-input architecture places very little DC loading on the source. The differential input can accept the sensor output while common-mode rejection of at least 106 dB at 10 kHz suppresses noise shared by both inputs. Select a gain of 1, 10, 100, 200, or 500 V/V according to the sensor range, and verify the common-mode and output-voltage limits before connection. The 4-microsecond settling time also allows reasonably rapid readings when the sensor output changes between samples.
Recommended
Multiplexed Data-Acquisition Systems
Fast settling makes the INA110SG effective ahead of multiplexed analog input channels and successive-approximation converters. The amplifier reaches 0.01% accuracy in 4 microseconds, reducing the acquisition dead time after a channel switch. Internal gain settings cover 1 to 500 V/V, allowing different sensor ranges to share a consistent acquisition architecture. Its 2.5 MHz typical bandwidth provides more than enough signal bandwidth for many precision measurements, while 106 dB common-mode rejection at 10 kHz helps preserve accuracy when switching between sources with different common-mode levels.
Recommended
Precision Bridge Amplifier
The INA110SG provides accurate differential gain for resistive bridge sensors while rejecting common-mode voltage changes associated with excitation supply or ground variation. Selectable gains of 1, 10, 100, 200, and 500 V/V accommodate millivolt-level bridge outputs without requiring a complete external gain network. Gain drift of up to 50 ppm/degree Celsius and offset drift of 2 microvolts/degree Celsius help preserve calibration stability across temperature. Route the bridge and reference connections symmetrically, and confirm that the operating common-mode voltage remains within the device limits.
Recommended
Current-Shunt Measurement
The INA110SG can amplify the differential voltage developed across a low-value shunt when the shunt common-mode voltage remains within the input range. Its low 50 pA maximum bias current introduces minimal measurement error in high-impedance shunt arrangements, and the high common-mode rejection helps distinguish the shunt differential signal from common-mode disturbances. Gains up to 500 V/V support measurement of small voltage drops with suitable headroom. For battery, power-supply, or motor-control systems, verify the shunt common-mode voltage and amplifier output swing throughout the expected operating range.
Recommended
Laboratory Measurement Instrumentation
The fast-settling, high-accuracy INA110SG is appropriate for laboratory front ends that measure low-level differential signals over a broad frequency range. Its 2.5 MHz typical bandwidth supports higher-bandwidth measurements, while internal gains make it easier to standardize input conditioning across several instrument ranges. The 50 pA maximum input bias current is beneficial when the source impedance is high, and the 106 dB common-mode rejection at 10 kHz improves interference suppression. Layout should use short, balanced input paths, guard high-impedance nodes, and place supply bypass capacitors directly beside the device pins.
Recommended
Multichannel Industrial Sensor Acquisition
The INA110SG is suitable for industrial acquisition cards that must combine several low-level sensor inputs with rapid settling and consistent common-mode rejection. Its internal gain choices reduce the number of external precision resistors, while the 4-microsecond settling specification supports short channel-selection intervals. The extended -55 to +125 degrees Celsius rating of the INA110SG also provides environmental margin in industrial equipment, control cabinets, and test systems. Protect sensitive inputs from transients, maintain consistent grounding, and verify each sensor’s excitation and common-mode limits before final calibration.
Recommended
Recommended Products Summary
Engineering reference data for INA110SG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA110KP | INA110BG | INA110UA |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-CDIP | 16-DIP | 16-DIP | 16-DIP |
| Device Type | Single-channel instrumentation amplifier | Single-channel instrumentation amplifier | Single-channel instrumentation amplifier | Single-channel instrumentation amplifier |
| Input Stage | FET input | FET input | FET input | FET input |
| Internal Gain Settings | 1, 10, 100, 200, and 500 V/V | 1, 10, 100, 200, and 500 V/V | 1, 10, 100, 200, and 500 V/V | 1, 10, 100, 200, and 500 V/V |
| Settling Time to 0.01% | 4 microseconds | 4 microseconds | 4 microseconds | 4 microseconds |
| Typical Bandwidth | 2.5 MHz | 2.5 MHz | 2.5 MHz | 2.5 MHz |
| Maximum Input Bias Current | 50 pA | 50 pA | 50 pA | 50 pA |
| Common-Mode Rejection | 106 dB minimum at 10 kHz | 106 dB minimum at 10 kHz | 106 dB minimum at 10 kHz | 106 dB minimum at 10 kHz |
| Operating Temperature Range | -55 degrees Celsius to +125 degrees Celsius | -40 degrees Celsius to +85 degrees Celsius | 0 degrees Celsius to +70 degrees Celsius | -40 degrees Celsius to +85 degrees Celsius |
Key Differentiators
- Extended-temperature ceramic CDIP construction (vs INA110KP)
- Fast multiplexed-channel settling (vs INA110BG)
- Low-noise high-impedance signal conditioning (vs INA110UA)
Design Notes
Route the two input signals as short, symmetric traces to minimize parasitic imbalance and preserve common-mode rejection. High-impedance input nodes should be guarded and kept away from switching nodes and long copper areas. Connect the bypass capacitor directly across the supply pins, and use the manufacturer's pin table for every gain-select connection before releasing the PCB layout.
Account for the 4-microsecond settling time when defining acquisition timing after channel selection. The amplifier should be allowed to settle before the converter samples the output, and the required settling interval must include the ADC acquisition time and clock delays. This is especially important in multiplexed systems where adjacent channels can differ in level or common-mode voltage.
Do not assume that a same-footprint family member is an unrestricted substitute. The INA110KP, INA110BG, and INA110UA retain the 16-lead DIP format but differ in environmental rating and package material. Verify the manufacturer ordering information, temperature range, pin functions, gain configuration, and qualification requirements before substituting any variant in the INA110SG position.
Compliance Information
The manufacturer product page and ordering information should be checked for current compliance declarations. The INA110SG's extended temperature rating does not by itself establish AEC-Q100 qualification.
