INA117KU - ±200V High CMV Difference Amplifier | TI
MPN: INA117KU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.75 | $5.75 |
| 10 | $5.29 | $52.90 |
| 100 | $4.9 | $490.00 |
| 500 | $4.52 | $2,260.00 |
| 1,000 | $4.2 | $4,200.00 |
Drop-in alternatives for INA117KU — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
INA149U
✅ Drop-In📋 Reference alternative (not in catalog)
INA117KU/2K5
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →AD629ARZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD8479ARZ
✅ Drop-In📋 Reference alternative (not in catalog)
INA117U
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
INA117KU Maximum Ratings & Electrical Characteristics
| Function | Precision unity-gain difference amplifier |
| Common-Mode Input Range | ±200 V (VS = ±15 V) |
| Overload Protection (Common-Mode) | ±500 V |
| Overload Protection (Differential) | ±500 V |
| Gain | 1 V/V (unity) |
| Gain Error | 0.02% max |
| Nonlinearity | 0.001% max |
| CMRR | 86 dB min |
| Offset Voltage | 1000 uV max |
| Bandwidth | 0.2 MHz |
| Architecture | Precision op amp + integrated thin-film resistor network |
| Supply Voltage | ±15 V (nominal) |
| Operating Temperature Range | -40°C to +85°C |
| Package | 8-SOIC (surface mount) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
INA117KU Pin Configuration
| Pin 1 | V+ — Positive supply (nominal +15 V) |
| Pin 2 | IN- — Inverting input (differential signal) |
| Pin 3 | IN+ — Non-inverting input (differential signal) |
| Pin 4 | REF — Reference pin - drive with low-impedance source to set output offset |
| Pin 5 | VOUT — Amplifier output, unity gain |
| Pin 6 | V- — Negative supply (nominal -15 V) |
| Pin 7 | NC — Not connected |
| Pin 8 | NC — Not connected |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
INA117KU is suitable for 6 applications: High-Side Current Sensing, Industrial Motor Drive Voltage Monitoring, Test and Measurement Input Conditioning, Level Shifting for ADC Inputs, Battery Management and Cell Monitoring, Analog Multiplexed Signal Acquisition.
High-Side Current Sensing
The INA117KU's ±200V common-mode input range makes it a natural fit for high-side shunt current sensing on industrial bus rails up to 200V. The shunt sits directly in the high-voltage path, with the amplifier's IN+ and IN- pins strapped across it; the on-chip thin-film resistor network rejects the large rail voltage while amplifying only the millivolt-level shunt signal at unity gain. With 0.02% max gain error and 86 dB minimum CMRR, measurement accuracy is dominated by the shunt tolerance rather than the amplifier. The REF pin lets you offset the output into a unipolar ADC range. Place the INA117KU close to the shunt and keep the reference drive low-impedance to preserve CMRR at full common-mode.
Recommended
Industrial Motor Drive Voltage Monitoring
In motor drives and inverter systems, DC bus voltages and phase-leg nodes swing far above the logic domain. The INA117KU measures these high-voltage nodes directly, dividing down the common-mode content internally and delivering a ground-referenced, unity-gain replica of the differential signal to the controller ADC. Its ±500V common-mode and differential input protection gives robustness against switching transients and fault events common in traction and servo drives. The 0.2 MHz bandwidth supports monitoring of bus ripple and low-frequency modulation phenomena, while 0.001% max nonlinearity keeps harmonic distortion out of diagnostics. Use the INA117KU for bus-voltage feedback in 200V-class drives; move to AD8479 for 600V-class systems.
Recommended
Test and Measurement Input Conditioning
Bench instruments, data acquisition front ends, and oscilloscope-like probes frequently must accept signals with large DC offsets riding on small differential content. The INA117KU conditions such inputs by subtracting the common-mode component up to ±200V and passing the differential content through with 0.02% gain error and 0.001% nonlinearity — figures sufficient for 13-14 effective bits of fidelity. The thin-film resistor network's temperature-stable ratio tracking means the instrument's accuracy holds across the -40°C to +85°C industrial range without calibration drift typical of discrete resistor dividers. Input protection to ±500V shields the front end from operator misconnection, reducing warranty failures in fielded test equipment.
Recommended
Level Shifting for ADC Inputs
When a sensor or process signal rides on a high common-mode potential, the INA117KU shifts it down to the ADC's low-voltage input range in a single stage. The differential signal is preserved at unity gain while the common-mode — up to ±200V — is rejected by the internal resistor network, and the REF pin sets the ADC-mid-scale bias point. Compared to discrete resistor-divider plus op amp solutions, the monolithic approach eliminates ratio-matching errors and their temperature drift, achieving 86 dB min CMRR without component selection labor. Buffer the REF pin with a low-offset op amp such as the OPA2277, and keep the source impedance at each INA117 input low so bias currents do not add offset error.
Recommended
Battery Management and Cell Monitoring
Stacked battery strings in UPS systems, telecom plants, and energy storage racks create series-stacked cell voltages well beyond conventional amplifier limits. The INA117KU measures individual cell or block voltages relative to a lower node because its inputs tolerate ±200V common-mode — enough for 40+ lead-acid cell blocks. The ±500V protection rating tolerates charge/discharge transients and connector faults. Unity gain with 0.02% error supports the percent-level state-of-charge estimation accuracy these systems need, while its bipolar supply operation fits the classic stack-monitor architecture where a local isolated supply provides ±15V rails. For lithium stacks exceeding 200V per monitored section, choose the AD8479 with its ±600V range.
Recommended
Analog Multiplexed Signal Acquisition
Multi-channel acquisition systems scanning high-voltage sources — heater elements, solenoid rails, plate supplies — can route each channel to a shared INA117KU after an analog multiplexer. Because the INA117 presents its inputs through the internal resistor network, the multiplexer's on-resistance and charge injection see a forgiving load, and the amplifier's 0.001% max nonlinearity ensures channel-to-channel consistency critical for calibrated multi-point measurements. Settling after multiplexer switching is governed by the 0.2 MHz bandwidth: allow several microseconds per channel for full-accuracy sampling. Common-mode up to ±200V is rejected on every channel regardless of which source is selected, eliminating per-channel attenuator circuits and their matching burden.
Recommended
Recommended Products Summary
Engineering reference data for INA117KU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA149U | AD629ARZ | AD8479ARZ |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| Common-Mode Input Range | ±200 V | ±275 V | ±270 V | ±600 V |
| Gain Error | 0.02% max | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| CMRR (min) | 86 dB | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Supply Current | [DATA_NEEDED] | 0.81 mA | [DATA_NEEDED] | [DATA_NEEDED] |
| Input Protection | ±500 V common-mode / differential | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Bandwidth | 0.2 MHz | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Unit Price (qty 1, as of 2026-09-13) | $5.75 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Lower precision-part cost point in family (vs INA149U)
- Symmetric ±200V bipolar common-mode range (vs AD629ARZ)
- Precision thin-film accuracy class (vs AD8479ARZ)
Design Notes
Never leave the REF pin connected through a resistor divider or long trace. The INA117's CMRR of 86 dB min depends on a low-impedance reference drive; resistance in the REF path unbalances the internal thin-film ratio and converts reference impedance directly into gain and CMRR error. Use an op amp buffer (e.g., OPA2277) or a dedicated precision reference to drive REF, and decouple it with 0.1 uF close to the pin.
The ±200V common-mode range is specified at VS = ±15V per the TI datasheet. Operating from reduced supplies (e.g., ±12V) proportionally shrinks the usable common-mode window, and exceeding the window drives internal nodes into saturation with misleading output. Always verify worst-case bus voltage plus ripple and transient headroom against the supply condition. The ±500V input protection ratings apply to transient overload, not continuous operation — derate accordingly for fault scenarios.
Keep the differential input traces (pins 2 and 3) short, matched in length, and routed away from switching nodes. Place a 0.1 uF ceramic capacitor within 2 mm of each supply pin (1 and 6) to a solid ground. Although the inputs are protected to ±500V, adding series resistors (e.g., 10 kOhm) at IN+/IN- costs no accuracy at unity gain thanks to the high input impedance topology and adds robust ESD and surge margin in industrial environments.
Compliance Information
RoHS compliant per distributor listings. AEC-Q100 qualification not indicated in provided data; INA117 is specified for -40°C to +85°C industrial range.
