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Texas Instruments 2A997/2K5
- Part No.:
- 2A997/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- -
- Datasheet:
-
2A997/2K5.pdf
- Description:
- DIFF AMP FOR OSITECH
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
INA117KU/2K5 from Texas Instruments is a precision unity-gain difference amplifier optimized for high common-mode voltage monitoring in industrial power systems. It delivers ±200V continuous common-mode input range, 0.001% nonlinearity, 86dB min CMRR, and 200kHz bandwidth - enabling accurate differential voltage measurement across battery cells, motor drives, and grounded power rails without isolation.
For engineers reviewing the INA117KU/2K5 datasheet, INA117KU/2K5 pinout, INA117KU/2K5 application, or INA117KU/2K5 equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases in current sensing and cell monitoring, and two validated alternative parts with documented functional trade-offs.
Technical Context
The INA117KU/2K5 integrates a precision op amp with a laser-trimmed thin-film resistor network to achieve 0.02% max gain error and 120µV initial offset voltage. Its input stage withstands ±500V momentary common-mode and differential overloads, making it suitable for direct connection to high-voltage nodes without external protection.
It operates as a fixed-gain (G = 1) difference amplifier with transfer function VO = V3 – V2, optionally extended via reference pins (VO = V3 – V2 + 19·V5 – 18·V1). Compensation pin (Pin 8) must be grounded or AC-coupled to maintain 200kHz bandwidth and 86dB CMRR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-Mode Input Range | ±200V continuous - enables direct measurement across 400V differential bus sections without isolation |
| Gain Accuracy | 0.02% max gain error - ensures <±2mV error on 10V differential signals at room temperature |
| Nonlinearity | 0.001% max - supports precision current sensing with sub-0.1% full-scale distortion |
| CMRR | 86dB min DC - rejects >200,000:1 common-mode interference in factory automation environments |
| Bandwidth | 200kHz −3dB - captures fast transients in motor control feedback loops and switching power supply monitoring |
| Input Protection | ±500V common-mode & differential - eliminates need for external TVS or clamping diodes |
| Supply Voltage Range | ±5V to ±18V - compatible with standard ±15V industrial rails and derated ±12V systems |
Pinout & Package
INA117KU/2K5 is housed in an SOIC-8 (Package Drawing D) surface-mount package, 4.9mm × 3.9mm × 1.45mm, RoHS-compliant, moisture sensitivity level 3 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RefA) | Reference input A | Accepts user-defined offset voltage; used with Pin 5 to extend transfer function per VO = V3 – V2 + 19·V5 – 18·V1 |
| 2 (–In) | Inverting input | Differential input node; connects to low-side of sense resistor or negative battery terminal |
| 3 (+In) | Non-inverting input | Differential input node; connects to high-side of sense resistor or positive battery terminal |
| 4 (V–) | Negative supply rail | Must be connected to system ground or negative supply; TO-99 case internally tied to this pin |
| 5 (RefB) | Reference input B | Second reference terminal; paired with Pin 1 to enable programmable common-mode offset injection |
| 6 (VO) | Output | Unity-gain buffered differential output; drives loads up to ±20mA with 0.01Ω output impedance |
| 7 (V+) | Positive supply rail | Accepts +5V to +18V; requires local 1µF tantalum decoupling per datasheet Figure 1 |
| 8 (Comp) | Compensation | Ground or 0.1µF AC-coupled to V+ to cancel substrate capacitance and preserve dynamic CMRR |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Enables 0.02% gain error and 86dB CMRR without external trimming components |
| Integrated ±500V input protection | Eliminates discrete TVS diodes and series current-limiting resistors in high-voltage monitoring paths |
| 200kHz bandwidth at G=1 | Supports real-time monitoring of PWM-driven motor currents and switching regulator ripple |
| 0.001% nonlinearity | Ensures calibrated accuracy over full temperature range (–40°C to +85°C) for battery management systems |
| Reference pin flexibility (Pins 1 & 5) | Allows configurable common-mode offset injection to extend effective input range beyond ±200V |
Applications
| Battery Cell-Voltage Monitor | Industrial Current Monitor |
|---|---|
Use Scenario: Monitoring individual cell voltages in 48V–400V lithium-ion battery packs with stacked architecture. IC Role / Device Role / Timing Role: Precision difference amplifier measuring mV-level differential voltage across each cell while rejecting >200V common-mode bus potential. Use Value: Enables accurate state-of-charge estimation without galvanic isolation, reducing BOM cost and board area by eliminating isolated DC/DC supplies. |
Use Scenario: Measuring load current in PLC output modules driving solenoids, valves, or motor starters. IC Role / Device Role / Timing Role: High-CMRR current-sense amplifier interfacing with shunt resistors placed on grounded or floating return paths. Use Value: Delivers 0.001% linearity and ±200V common-mode tolerance, allowing direct connection to 240VAC or 380VDC industrial buses. |
| Ground Breaker Detection | Noisy Environment Signal Acquisition |
Use Scenario: Detecting insulation failure in grounded HV systems (e.g., EV traction inverters, solar string combiners) by monitoring leakage current via shunt. IC Role / Device Role / Timing Role: Differential amplifier capturing µA-level fault currents across high-impedance sense networks under ±200V common-mode stress. Use Value: Survives ±500V transient surges during ground-fault events, ensuring continuous diagnostics without latch-up or damage. |
Use Scenario: Acquiring analog sensor signals (e.g., pressure, temperature) in factory-floor environments with heavy EMI from VFDs and arc welders. IC Role / Device Role / Timing Role: Front-end signal conditioner rejecting 60Hz and harmonics via 86dB CMRR while preserving 200kHz signal fidelity. Use Value: Maintains SNR >70dB in 400Vp-p common-mode noise fields, eliminating need for expensive shielded cabling or isolation amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8479ARZ | Wider ±500V common-mode range; higher 120dB CMRR; 150kHz bandwidth; single-supply capable (4.5V–36V) | Preferred for ultra-high-CMRR requirements in medical or aerospace; less optimal for cost-sensitive industrial designs | Select AD8479ARZ when >100dB CMRR or single-supply operation is mandatory; not drop-in due to different pinout and biasing |
| INA149IDR | ±275V common-mode range; 100dB CMRR; 200kHz bandwidth; integrated ESD protection; SO-8 package | Better suited for new designs requiring enhanced robustness and lower offset drift (0.3µV/°C vs. 8.5µV/°C) | Choose INA149IDR for improved long-term stability and higher CMRR; requires layout review due to different reference pin configuration |
Compared with INA117KU/2K5, AD8479ARZ offers superior CMRR and wider common-mode range but trades off cost and pin compatibility, while INA149IDR improves thermal drift and ESD resilience at the expense of slightly higher quiescent current (1.8mA vs. 1.5mA).
Availability
INA117KU/2K5 is available at Aetrix Electronics and suitable for battery management systems, industrial current monitoring, ground-fault detection, and noisy-environment signal acquisition requiring stable component supply across multi-year production cycles.
Supply support for INA117KU/2K5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of innovation in precision signal conditioning and power management ICs.
The INA117 product line was designed specifically for high-voltage differential measurement in industrial, energy, and automotive subsystems where galvanic isolation is impractical - delivering precision, protection, and reliability in a monolithic IC.
FAQ
What is the maximum continuous common-mode voltage the INA117KU/2K5 can handle?
The INA117KU/2K5 supports ±200V continuous common-mode input voltage when powered with ±15V supplies. This rating is confirmed in the Absolute Maximum Ratings table and maintained across the full –40°C to +85°C operating temperature range. Transient overloads up to ±500V are tolerated for ≤10 seconds without damage, as specified in the ESD and overload protection section of the SBOS154A datasheet.
Does the INA117KU/2K5 require external trimming for gain or offset accuracy?
No, the INA117KU/2K5 does not require external trimming. Its laser-trimmed thin-film resistor network guarantees 0.02% max gain error and 120µV max initial offset voltage (AM grade) without user adjustment. Optional offset or CMRR trim circuits (Figures 2 and 3 in SBOS154A) exist but are only needed for applications demanding tighter than datasheet-specified performance.
Can the INA117KU/2K5 operate from a single +12V supply?
No, the INA117KU/2K5 requires dual supplies (e.g., ±5V to ±18V) to support its ±200V common-mode input range. The internal architecture relies on symmetric rails to bias the input stage and maintain CMRR. Attempting single-supply operation violates the Absolute Maximum Ratings and will result in incorrect output behavior or device damage.
What is the purpose of Pin 8 (Comp) on the INA117KU/2K5, and how must it be connected?
Pin 8 (Comp) connects to internal compensation circuitry that cancels parasitic capacitance between the feedback resistors and IC substrate. To ensure specified 200kHz bandwidth and 86dB CMRR, Pin 8 must be grounded directly or connected through a 0.1µF capacitor to AC ground (e.g., V+), as shown in Figure 1 of SBOS154A. Leaving Pin 8 floating degrades dynamic performance and increases settling time.
How does the INA117KU/2K5 differ from the INA149 in terms of reference pin functionality?
The INA117KU/2K5 uses Pins 1 (RefA) and 5 (RefB) to enable programmable offset injection via VO = V3 – V2 + 19·V5 – 18·V1, supporting custom common-mode translation. In contrast, the INA149 has dedicated reference pins configured for fixed gain scaling and lacks this flexible multi-coefficient transfer function - making the INA117KU/2K5 uniquely suited for applications requiring dynamic common-mode range extension.
2A997/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- -
- Number of Circuits:
- -
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- -
- Voltage - Supply Span (Max):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
2A997/2K5 FAQ
1.How can I place an order for 2A997/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2A997/2K5 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 2A997/2K5 reliable?
The price and inventory of 2A997/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2A997/2K5 is usually 5 days.
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2A997/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2A997/2K5 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 2A997/2K5?
For technical support, including 2A997/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2A997/2K5 requirements.
6.How does Aetrix verify that 2A997/2K5 is sourced from the original manufacturer or authorized distributors?
All 2A997/2K5 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 2A997/2K5 meets industry standards.
7.What is the process for return or replacement of 2A997/2K5?
All 2A997/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with 2A997/2K5, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 2A997/2K5 part is unused and in its original packaging.
Return procedure for 2A997/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2A997/2K5 Tags
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