INA117P-BI - ±200V Common-Mode Differential Amplifier | TI
MPN: INA117P-BI ✓ ActiveINA117P-BI Overview
A difference amplifier is a voltage-feedback amplifier that amplifies the voltage difference between two input terminals while rejecting voltage common to both inputs. The INA117P-BI is intended for applications where the signal of interest is small but the surrounding common-mode voltage can be large. Its ±200V common-mode input range is particularly useful when measuring small voltages across high-voltage bus systems, power-conversion circuits, and industrial equipment.
Key performance specifications include a maximum unity-gain error of 0.02%, a maximum nonlinearity of 0.001%, a minimum CMRR of 86dB, and protected inputs rated at ±500V common-mode and ±500V differential. The device operates from a single supply or dual supply arrangement described by the manufacturer datasheet, and its specified operating temperature range is -40°C to +85°C. The INA117 family is also available in an 8-pin SO-8 surface-mount package for compact designs.
The INA117P-BI is suitable for precision measurement, power-supply monitoring, current-shunt instrumentation, and analog signal-conditioning systems. Its integrated thin-film network improves gain matching and common-mode rejection without requiring external matched resistors. Designers should still provide input protection appropriate to the application, maintain the specified supply limits, and account for input bias-current effects and thermal conditions at the measurement nodes.
For PCB implementation, place the amplifier close to the sensing components and route high-voltage and sensitive-signal paths to minimize leakage, contamination, and coupling. Use guarded grounding and clean analog return paths when measuring microvolt-level signals. The 8-pin PDIP format supports through-hole prototyping and repair, while the SO-8 alternative is preferable where board area is constrained. This page combines the manufacturer specifications, package details, sourcing information, and design guidance needed to evaluate the INA117P-BI for high-common-mode measurement systems.
Drop-in alternatives for INA117P-BI — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with INA117P-BI (same form factor and footprint) — differing in Bandwidth, Package, Mounting Type, Nonlinearity, Operating Temperature Range.
INA117P
✅ Drop-InContact for price
View Datasheet →AD629ANZ
✅ Drop-In📋 Reference alternative (not in catalog)
INA117BM
✅ Drop-InContact for price
View Datasheet →INA117KU
✅ Drop-InContact for price
View Datasheet →INA117P-BI Maximum Ratings & Electrical Characteristics
| Device Type | Precision unity-gain difference amplifier |
| Number of Circuits | 1 |
| Common-Mode Input Range | ±200V |
| Protected Common-Mode Input | ±500V |
| Protected Differential Input | ±500V |
| Unity-Gain Error | 0.02% maximum |
| Nonlinearity | 0.001% maximum |
| CMRR | 86dB minimum |
| Bandwidth | 200kHz for CSO: SHE; 500kHz for CSO: TID |
| Architecture | Precision operational amplifier with integrated thin-film resistor network |
| Operating Temperature Range | -40°C to +85°C |
| Package | 8-pin plastic mini-DIP |
| Mounting Type | Through-hole |
| Output Type | Single-ended analog output |
| Input Protection | Protected inputs up to ±500V common-mode and differential |
| AEC-Q100 Qualification | Not applicable |
INA117P-BI 8-pin plastic mini-dip Pin Configuration Guide
Pin configuration for INA117P-BI (8-pin plastic mini-dip 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 INA117P-BI.
Refer to the datasheet for full pin configuration.
Typical Applications
INA117P-BI is suitable for 6 applications: High-Voltage Bus Differential Sensing, Power-Supply Monitoring, Current-Shunt Instrumentation, Industrial Sensor Signal Conditioning, Analog-to-Digital Converter Front End, Precision Analog Measurement Systems.
High-Voltage Bus Differential Sensing
The INA117P-BI is appropriate for measuring a small voltage difference across a high-voltage bus while both input nodes carry a large common-mode potential. Its specified ±200V common-mode input range and 86dB minimum CMRR help preserve the differential measurement when the bus voltage is much larger than the signal being measured. The device can sit near the sensing points in an instrumentation circuit, followed by downstream filtering and isolation. Input protection, creepage, clearance, leakage current, and PCB contamination must be checked against the actual bus voltage because the component rating alone does not determine safe system behavior.
Recommended
Power-Supply Monitoring
The INA117P-BI can monitor the small differential error between two power-system nodes without requiring the front end to operate near ground potential. Its unity-gain architecture, 0.02% maximum gain error, and 0.001% maximum nonlinearity support accurate supervisory and fault-detection measurements. The amplifier is useful where a controller must observe a regulated rail, a floating supply, or a difference between two related voltage nodes. Designers should confirm supply limits and output-swing requirements in the manufacturer datasheet, and should keep the high-voltage path physically separated from sensitive control circuitry.
Recommended
Current-Shunt Instrumentation
The INA117P-BI can amplify the small differential voltage produced by a current-shunt resistor while rejecting voltage common to both shunt terminals. The ±200V common-mode range is useful when the shunt is located in a high-side or otherwise elevated circuit, while the integrated thin-film network simplifies gain matching. The resulting signal can feed an ADC, comparator, or analog-to-digital conversion stage. For accurate results, maintain symmetrical input routing, provide suitable shunt and filtering components, and account for input bias current and parasitic leakage across the measurement loop.
Recommended
Industrial Sensor Signal Conditioning
The INA117P-BI can condition differential sensor signals in industrial systems where the sensor output is small and the surrounding process common-mode voltage is substantial. Its high common-mode rejection helps reduce errors from power switching and industrial noise, while the unity-gain configuration supports straightforward signal-chain integration. The device is especially relevant for sensors connected to high-voltage equipment, provided that the complete front end includes proper protection, isolation where required, and a layout that minimizes leakage and capacitive coupling. The specified -40°C to +85°C range supports many industrial temperature environments.
Recommended
Analog-to-Digital Converter Front End
The INA117P-BI can serve as the differential input stage for an ADC when the source signal requires common-mode rejection before conversion. Its unity-gain error of 0.02% maximum and nonlinearity of 0.001% maximum help preserve signal integrity, while the protected inputs can simplify the input-protection strategy in suitable applications. The system designer should verify ADC input range, amplifier output swing, settling requirements, and bandwidth interaction. Place the amplifier close to the ADC input and use short, symmetric traces to reduce added error and noise before digitization.
Recommended
Precision Analog Measurement Systems
The INA117P-BI is suitable for laboratory and instrumentation systems that measure small differential voltages in the presence of large reference or operating voltages. The precision resistor network and high CMRR reduce the need for external resistor matching, making the device practical for repeatable measurement modules. Its through-hole 8-pin mini-DIP package is convenient for prototyping, educational platforms, and repairable industrial instruments. For low-level signals, use clean grounds, guarded input routing, calibrated test points, and an appropriate output low-pass filter to control the measurement bandwidth.
Recommended
Recommended Products Summary
Engineering reference data for INA117P-BI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA117P | AD629ANZ | INA117BM | INA117KU |
|---|---|---|---|---|---|
| Package | 8-pin plastic mini-DIP | 8-pin plastic mini-DIP | PDIP-8 | 8-pin package; exact code requires confirmation | 8-pin package; exact code requires confirmation |
| Brand | Texas Instruments | Texas Instruments | Analog Devices | Texas Instruments | Texas Instruments |
| Function | Precision unity-gain difference amplifier | Precision unity-gain difference amplifier | Differential amplifier | INA117-family difference amplifier | INA117-family difference amplifier |
Key Differentiators
- Very high common-mode operating range (vs AD629ANZ)
- Integrated precision resistor network (vs AD629ANZ)
- Input fault-tolerance margin (vs INA117P)
Design Notes
Route the two differential inputs symmetrically and keep them away from switching nodes, inductors, and high-current traces. The INA117P-BI relies on common-mode rejection, so unequal input routing can introduce error even when the amplifier itself has excellent CMRR. Use a guarded ground or driven guard around sensitive input nodes where practical, and maintain cleanliness around the input pins to avoid leakage-induced errors.
Design the input-protection network for the actual common-mode and differential fault conditions. The manufacturer specifies protected inputs at ±500V common-mode and differential, but that rating does not remove the need for clamping, current limiting, creepage, clearance, and safe fault-energy analysis. Verify that protection leakage does not compromise the small differential signal being measured.
Do not treat the INA117P-BI as a general-purpose unity-gain buffer or assume that any difference amplifier can replace it. The critical selection criteria are the ±200V common-mode range, input protection, CMRR, gain error, nonlinearity, supply requirements, and exact 8-pin mechanical footprint. For the INA117P-BI package, use the manufacturer pin-configuration table and verify that the PCB footprint matches the plastic mini-DIP outline.
Set the system bandwidth according to the measurement bandwidth rather than automatically using the highest available option. A wider bandwidth can reduce measurement response time but increases sensitivity to high-frequency noise and coupling. Use short signal traces, proper grounding, and input filtering that preserves differential symmetry. Estimate the maximum amplifier dissipation from the actual supply, output voltage, and load before finalizing the layout.
Compliance Information
The manufacturer materials describe the INA117 family and package options, but no explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals statement was identified in the retrieved manufacturer snippets. Verify current compliance documents before procurement or release.
