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Texas Instruments INA117BM-3
- Part No.:
- INA117BM-3
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Amplifiers
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
INA117BM-3.pdf
- Description:
- OPERATIONAL AMPLIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:11,295
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Product details
Overview
INA117BM-3 from Texas Instruments is a precision unity-gain difference amplifier optimized for high common-mode voltage measurement in industrial power systems. It delivers ±200V continuous common-mode input range, 0.001% nonlinearity, 86dB minimum CMRR, and 200kHz bandwidth - enabling accurate differential sensing across battery stacks, motor drives, and grounded-breaker monitoring circuits.
For engineers reviewing the INA117BM-3 datasheet, INA117BM-3 pinout, INA117BM-3 application, or INA117BM-3 equivalent, key selection criteria include its ±500V protected inputs (common-mode and differential), 0.02% max gain error at unity gain, TO-99 metal package thermal robustness, and suitability for replacing isolation amplifiers without isolated power supplies.
Technical Context
The INA117BM-3 implements a monolithic precision op amp with laser-trimmed thin-film resistor network to achieve ratio-matched feedback (380kΩ/21.1kΩ/20kΩ) and stable unity-gain transfer function VO = V3 – V2. Its internal compensation pin (Pin 8) cancels substrate capacitance effects, requiring grounding or AC-grounding via 0.1µF capacitor for full 200kHz bandwidth.
Input protection circuitry withstands ±500V transient common-mode and differential overloads, while the metal TO-99 package supports operation from –40°C to +85°C with low thermal resistance. The device's 400kΩ common-mode input impedance and 800kΩ differential input impedance enable direct connection to high-impedance sources without significant loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-Mode Input Range | ±200V continuous - enables direct sensing across multi-cell battery strings or DC bus voltages without level-shifting. |
| Gain Error (Unity) | Max 0.02% - ensures sub-200µV error on 1V differential output, critical for precision current/voltage monitoring. |
| Nonlinearity | 0.001% max - guarantees monotonic response and <10ppm deviation over full-scale output swing. |
| CMRR (DC) | Min 86dB - rejects >20,000:1 common-mode interference, essential in noisy factory automation environments. |
| Bandwidth (–3dB) | 200kHz - supports fast transient detection in motor control feedback loops and power supply monitoring. |
| Input Protection | ±500V common-mode & differential - eliminates need for external TVS/clamp networks in surge-prone industrial I/O. |
| Supply Voltage Range | ±5V to ±18V - allows flexible biasing from standard ±12V or ±15V rails while maintaining full performance. |
Pinout & Package
INA117BM-3 uses an 8-pin metal TO-99 package (drawing LMC) with case internally connected to V–. The hermetically sealed metal can provides EMI shielding and thermal stability for high-reliability industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RefA) | Reference input A | Accepts offset adjustment voltage; part of extended transfer function VO = V3 – V2 + 19·V5 – 18·V1. |
| 2 (–In) | Inverting input | Differential input node; connects to low-side of sense resistor or negative terminal of monitored voltage. |
| 3 (+In) | Non-inverting input | Differential input node; connects to high-side of sense resistor or positive terminal of monitored voltage. |
| 4 (V–) | Negative supply | Power rail input; case is internally bonded to this pin - must be connected to system ground or negative rail. |
| 5 (RefB) | Reference input B | Second reference terminal; enables common-mode voltage boosting or offset injection per application circuits. |
| 6 (VO) | Output | Unity-gain differential output; drives loads up to ±20mA with 1000pF capacitive stability. |
| 7 (V+) | Positive supply | Power rail input; supplies internal op amp and resistor network; requires local 1µF tantalum decoupling. |
| 8 (Comp) | Compensation | Internal compensation node; must be grounded or AC-grounded to maintain specified dynamic performance. |
Key Features
| Feature | Design Value |
|---|---|
| High common-mode rejection architecture | Laser-trimmed 380kΩ resistor network achieves 86dB CMRR without external trimming in most applications. |
| Integrated input protection | On-chip clamping sustains ±500V transients - eliminates discrete TVS diodes and reduces BOM count in safety-critical monitors. |
| Stable unity-gain operation | Guaranteed 200kHz bandwidth with 0.001% nonlinearity - outperforms conventional isolation amplifiers in speed and linearity. |
| Reference pin flexibility | Pins 1 and 5 support programmable offset injection and common-mode range extension (e.g., ±200V operation on ±9V supplies). |
| TO-99 thermal & EMI performance | Metal can provides low thermal resistance and inherent RF shielding - critical for high-noise industrial PLC and drive applications. |
Applications
| Battery Cell-Voltage Monitor | Current Monitor |
|---|---|
Use Scenario: Monitoring individual cell voltages in series-connected lithium-ion or lead-acid battery packs up to 200V total stack voltage. IC Role / Device Role / Timing Role: Precision difference amplifier measuring mV-level differential voltage across each cell while rejecting ±200V common-mode bus voltage. Use Value: Enables accurate state-of-charge estimation and cell balancing without optical isolation or expensive isolated power supplies. | Use Scenario: Measuring load current in industrial motor drives or power supplies by sensing voltage drop across a shunt resistor. IC Role / Device Role / Timing Role: High-CMRR difference amplifier converting shunt voltage to ground-referenced output with minimal offset drift. Use Value: Achieves 0.02% gain accuracy and 0.001% nonlinearity - supporting Class 0.1 current measurement standards in energy metering. |
| Ground Breaker | Signal Acquisition in Noisy Environments |
Use Scenario: Detecting ground fault currents in high-voltage distribution panels where leakage paths introduce large common-mode noise. IC Role / Device Role / Timing Role: Protected differential amplifier isolating fault-induced differential signals from ±200V floating bus potentials. Use Value: ±500V input protection prevents latch-up during arc-flash events, ensuring reliable breaker tripping in utility substations. | Use Scenario: Acquiring sensor signals (e.g., thermocouples, strain gauges) in factory automation cells with variable-frequency drives and welding equipment. IC Role / Device Role / Timing Role: Low-drift, high-CMRR amplifier rejecting 60Hz and harmonics from nearby EMI sources while preserving µV-level signal integrity. Use Value: 86dB CMRR at 60Hz and 200kHz bandwidth enable clean signal capture without external notch filters or shielded cabling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA149IDR | SO-8 package; 200V CM range; 120dB CMRR; 500kHz bandwidth; no input protection beyond ±40V | Higher CMRR and speed but lacks ±500V overload protection - requires external clamping for surge-prone environments | Select when ultra-high CMRR and bandwidth are prioritized over ruggedness; verify external protection meets system surge requirements. |
| AMC1301DWVR | Reinforced isolation; 1kVrms rating; 7.5MHz bandwidth; integrated isolated DC/DC; ±320V input range | Provides galvanic isolation - eliminates ground loop risks but adds cost and complexity versus INA117BM-3's direct-sense approach | Select when safety certification (IEC 61000-4-5) or true isolation is mandated; avoid if cost-sensitive or space-constrained. |
Compared with INA149IDR and AMC1301DWVR, the INA117BM-3 uniquely combines ±500V input protection, TO-99 thermal stability, and 0.001% nonlinearity in a non-isolated architecture - making it optimal for cost-sensitive, high-ruggedness industrial monitoring where isolation is not safety-mandated.
Availability
INA117BM-3 is available at Aetrix Electronics and suitable for battery management systems, motor drive current sensing, ground fault detection, and industrial signal acquisition requiring stable component supply across extended temperature ranges.
Supply support for INA117BM-3 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 decades of expertise in precision amplifiers and industrial interface solutions.
The INA117 product line was designed specifically for high-voltage differential measurement in factory automation, energy infrastructure, and power electronics - delivering isolation-amplifier performance without isolated power supplies.
FAQ
What is the maximum continuous common-mode voltage the INA117BM-3 can handle?
The INA117BM-3 supports ±200V continuous common-mode input voltage when operated with ±15V supplies. This rating is maintained across its specified temperature range of –40°C to +85°C and enables direct measurement across multi-cell battery stacks or DC bus lines without external attenuation. Exceeding ±200V continuously may degrade long-term reliability, though the device withstands ±500V transients for up to 10 seconds.
Does the INA117BM-3 require external components for stable operation?
Yes, the INA117BM-3 requires two 1µF tantalum decoupling capacitors - one between V+ and common, and another between V– and common - placed as close as possible to Pins 7 and 4. Pin 8 (Comp) must be grounded or connected to AC ground via a 0.1µF capacitor to maintain full 200kHz bandwidth and prevent oscillation. These requirements are explicitly defined in the TI SBOS154A datasheet Figure 1.
How does the INA117BM-3 compare to isolation amplifiers in terms of power supply requirements?
The INA117BM-3 eliminates the need for isolated input-side power supplies required by traditional isolation amplifiers. It operates from a single ±15V (or ±5V to ±18V) supply referenced to the measured common-mode potential, reducing system cost, board area, and noise from isolated DC/DC converters. This architecture is viable where galvanic isolation is not mandated by safety standards.
What is the purpose of Pins 1 (RefA) and 5 (RefB) on the INA117BM-3?
Pins 1 and 5 enable extended functionality beyond basic unity-gain differencing. The complete transfer function is VO = V3 – V2 + 19·V5 – 18·V1, allowing precise offset injection, common-mode voltage boosting (e.g., extending ±200V range on ±9V supplies), or summing auxiliary signals. Application circuits in the SBOS154A datasheet show how these pins support ground-referenced output generation in high-common-mode scenarios.
Is the INA117BM-3 still in active production?
No - according to Texas Instruments' official packaging addendum (dated 2016), INA117BM-3 is marked "OBSOLETE". It is no longer manufactured, and TI does not recommend it for new designs. However, Aetrix Electronics maintains legacy inventory and provides traceable, tested units for ongoing production support and repair of installed base systems.
INA117BM-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-99-8 Metal Can
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Differential
- Applications:
- Data Acquisition
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TO-99-8
INA117BM-3 FAQ
1.How can I place an order for INA117BM-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA117BM-3 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 INA117BM-3 reliable?
The price and inventory of INA117BM-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA117BM-3 is usually 5 days.
3.What payment methods are accepted for INA117BM-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA117BM-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA117BM-3?
INA117BM-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA117BM-3 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 INA117BM-3?
For technical support, including INA117BM-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA117BM-3 requirements.
6.How does Aetrix verify that INA117BM-3 is sourced from the original manufacturer or authorized distributors?
All INA117BM-3 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 INA117BM-3 meets industry standards.
7.What is the process for return or replacement of INA117BM-3?
All INA117BM-3 units undergo pre-shipment inspection (PSI). If there is an issue with INA117BM-3, 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 INA117BM-3 part is unused and in its original packaging.
Return procedure for INA117BM-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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