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Texas Instruments INA114BU/1K
- Part No.:
- INA114BU/1K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
INA114BU/1K.pdf
- Description:
- IC INST AMP 1 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,919
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Product details
Overview
INA114BU/1K from Texas Instruments is a precision instrumentation amplifier designed for high-accuracy signal conditioning in industrial and medical sensor interfaces. It delivers 50 µV max offset voltage, 0.3 µV/°C max drift, 115 dB min CMRR at G = 1000, ±2.25 V to ±18 V dual-supply operation, and input overvoltage protection up to ±40 V - enabling robust performance in surgical equipment and train control systems.
For engineers reviewing the INA114BU/1K datasheet, INA114BU/1K pinout, INA114BU/1K application, or INA114BU/1K equivalent, key selection considerations include its three-op-amp architecture, single-resistor gain setting (G = 1 to 10,000), SOIC-16 package with output sense pin, laser-trimmed DC accuracy, and −40°C to +85°C operating range.
Technical Context
The INA114BU/1K implements a classic three-op-amp instrumentation topology with internal laser-trimmed thin-film resistors defining gain accuracy and drift. Its input stage uses FET-based amplifiers to achieve 2 nA max input bias current and >100 GΩ || 6 pF common-mode/differential impedance.
It features dedicated input overvoltage protection circuitry that clamps ±40 V differential or common-mode transients without damage, and includes an output sense pin (Pin 12) in the SOIC-16 package to support remote load sensing and improved closed-loop accuracy under heavy or distributed loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | 50 µV maximum (RTI, G ≥ 100); enables sub-0.1% error in 50 mV full-scale bridge measurements |
| CMRR | 115 dB minimum at G = 1000; rejects >99.9997% of 60 Hz common-mode interference in ECG or RTD circuits |
| Gain range | 1 to 10,000 via single external resistor (G = 1 + 50 kΩ/RG); supports scalable sensor interface design without topology change |
| Supply range | ±2.25 V to ±18 V dual supply; operates from single 5 V rail with level-shifting, suitable for battery-powered portable diagnostics |
| Input protection | ±40 V absolute max on signal pins; survives transient faults in trackside signaling or actuator feedback loops without external clamping |
| Bandwidth | 1 MHz at G = 1 (CSO:SHE); sufficient for DC–10 kHz physiological signals and industrial process monitoring |
| Quiescent current | ±2.2 mA to ±3 mA; enables low-power operation in always-on condition monitoring nodes |
Pinout & Package
INA114BU/1K is supplied in a 16-pin SOIC (DW) surface-mount package measuring 10.3 mm × 10.3 mm, rated for −40°C to +85°C operation. The package includes an output sense terminal (Pin 12) for precision remote sensing - a feature absent in the PDIP-8 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (RG) | External gain-setting resistor connection | Connects to one end of RG; sets gain per G = 1 + 50 kΩ/RG; trace routing must minimize parasitic capacitance for stability |
| Pin 2 (−IN) | Inverting input | Differential input node; requires low-impedance bias path to avoid saturation; supports ±40 V fault tolerance |
| Pin 3 (+IN) | Non-inverting input | Differential input node; matched to Pin 2 for CMR; same ±40 V protection and bias current return requirements |
| Pin 4 (−VS) | Negative power supply | Must be decoupled with 0.1 µF ceramic capacitor near pin; supports down to −2.25 V for low-voltage operation |
| Pin 5 (REF) | Output reference | Defines output common-mode level; must be low-impedance (<5 Ω) to maintain >110 dB CMRR; buffered trimming allowed |
| Pin 6 (OUT) | Main output | Delivers amplified differential signal; drives 2 kΩ load with ±1.5 V swing at ±11.4 V supply |
| Pin 7 (+VS) | Positive power supply | Must be decoupled with 0.1 µF ceramic capacitor near pin; supports up to +18 V for wide dynamic range |
| Pin 11 (OUTS) | Output sense (SOIC only) | Direct connection to load-side output; used with Pin 12 to close feedback loop externally for improved accuracy under cable/load impedance |
| Pin 12 (SENSE) | Sense input (SOIC only) | Feedback return for Pin 11; internally shorted to Pin 6 in PDIP version; critical for remote-sensing configurations |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset & drift | 50 µV max VOS, 0.3 µV/°C max drift (G ≥ 100) - eliminates need for manual nulling in production test of surgical sensors |
| Single-resistor gain programming | G = 1 + 50 kΩ/RG - enables field-adjustable gain without redesign; 1% tolerance RG yields <0.5% gain error at G = 100 |
| ±40 V input overvoltage protection | Survives fault conditions without latch-up or parametric shift - critical for train control interfaces exposed to rail potential surges |
| SOIC-16 output sense architecture | Pins 11 & 12 enable Kelvin-sensing of load voltage - reduces errors from PCB trace resistance in multifunction relay driver feedback paths |
| Three-op-amp topology | Provides high input impedance (>100 GΩ), excellent CMRR vs frequency, and independent input/output common-mode ranges - essential for thermocouple cold-junction compensation |
Applications
| Surgical Equipment Interface | Train Control Signal Conditioning |
|---|---|
Use Scenario: Amplifying microvolt-level bio-potential signals from EEG/ECG electrodes in portable diagnostic units. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing high CMRR, low noise (0.4 µVPP, 0.1–10 Hz), and rail-to-rail compatible output swing. Use Value: Enables detection of 5 µV neural spikes amid 60 Hz mains interference without external notch filtering. | Use Scenario: Conditioning analog feedback signals from traction motor current sensors in onboard train management systems. IC Role / Device Role / Timing Role: Fault-tolerant signal conditioner with ±40 V input protection and −40°C to +85°C operation for trackside deployment. Use Value: Eliminates external TVS diodes and reduces BOM count while maintaining EN 50121-3-2 EMC immunity compliance. |
| RTD Temperature Measurement | Multifunction Relay Monitoring |
Use Scenario: Measuring resistance changes in Pt100 RTD elements within HVAC control panels using constant-current excitation. IC Role / Device Role / Timing Role: Low-drift, low-bias-current amplifier rejecting lead-wire resistance errors and thermal EMFs. Use Value: Achieves ±0.1°C accuracy over −20°C to +120°C range without calibration due to 0.3 µV/°C drift and 2 nA bias current. | Use Scenario: Isolating and scaling analog status signals (e.g., coil current, contact voltage) from industrial multifunction relays for PLC input modules. IC Role / Device Role / Timing Role: High-CMRR front-end amplifier with wide supply range supporting 24 V DC control rails and legacy 110 V AC systems. Use Value: Allows single hardware design to handle multiple relay families without gain-switching circuitry or supply reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128UA/1K | Lower input bias current (0.5 nA typ), higher CMRR (130 dB at G = 100), but narrower supply range (±2.5 V to ±18 V) and no ±40 V input protection | Better for ultra-high-impedance pH or piezoelectric sensors; unsuitable for rail-survivable trackside use | Select INA128UA/1K when bias current dominates error budget and fault tolerance is managed externally |
| AD8421ARMZ | Higher bandwidth (10 MHz at G = 1), lower noise (2.5 nV/√Hz), but requires dual supplies and lacks integrated input protection | Preferred for high-speed data acquisition; demands external protection and careful layout for EMI immunity | Choose AD8421ARMZ for >100 kHz signal chains where settling time and noise spectral density outweigh ruggedness needs |
Compared with INA114BU/1K, INA128UA/1K trades input protection for lower bias current and higher CMRR, while AD8421ARMZ sacrifices ruggedness and ease-of-use for speed and noise performance - making INA114BU/1K the optimal balance for cost-sensitive, fault-prone industrial and medical analog front-ends.
Availability
INA114BU/1K is available at Aetrix Electronics and suitable for surgical equipment, train control and management, RTD temperature measurement, and multifunction relay monitoring requiring stable component supply across extended product lifecycles.
Supply support for INA114BU/1K 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 heritage in precision signal chain components.
The INA114 belongs to TI's precision instrumentation amplifier product line, engineered specifically for high-accuracy, low-drift sensor signal conditioning in safety-critical industrial, medical, and transportation systems.
FAQ
What is the maximum gain achievable with INA114BU/1K, and how is it set?
The INA114BU/1K supports gains from 1 to 10,000, set by a single external resistor RG using the equation G = 1 + 50 kΩ/RG. For G = 10,000, RG = 5 Ω - requiring careful layout to minimize parasitic resistance. At this gain, the device maintains 115 dB CMRR and 50 µV max offset voltage, making INA114BU/1K suitable for microvolt-level strain gauge readouts in structural health monitoring.
Does INA114BU/1K require external input protection when used in train control systems?
No - the INA114BU/1K integrates robust input protection that withstands ±40 V differential or common-mode transients without damage, even with no power applied. This eliminates the need for external TVS diodes or series resistors in trackside signaling applications, simplifying design and improving reliability. The protection circuit limits input current to ~1.5 mA during overload, preserving INA114BU/1K functionality after fault clearance.
How does the SOIC-16 package of INA114BU/1K differ electrically from the PDIP-8 version?
The INA114BU/1K SOIC-16 adds Pins 11 (OUTS) and 12 (SENSE) for remote output sensing - a feature absent in the PDIP-8 (INA114BP). This allows closed-loop feedback directly at the load to cancel voltage drop across PCB traces or connectors. While both packages share identical DC specs and temperature range, only the SOIC-16 supports Kelvin-sensing configurations required for high-accuracy multifunction relay current monitoring.
What is the typical low-frequency noise performance of INA114BU/1K, and where is it most critical?
The INA114BU/1K delivers 0.4 µVPP input-referred noise over 0.1 Hz to 10 Hz - approximately one-tenth the noise of chopper-stabilized amplifiers. This ultra-low 1/f noise is critical in slow-moving physiological measurements (e.g., ECG baseline stability) and precision temperature sensing (RTD, thermocouple) where drift and noise dominate error budgets below 10 Hz. The value is confirmed for CSO:SHE and CSO:TID fabrication flows in the official INA114BU/1K datasheet.
Can INA114BU/1K operate from a single 5 V supply, and what design considerations apply?
Yes - the INA114BU/1K operates from single 5 V supplies (4.5 V to 36 V) per Recommended Operating Conditions. To do so, tie −VS to ground, set REF to mid-supply (2.5 V) via precision divider or buffer, and ensure input common-mode voltage stays within (V− + 4 V) to (V+ − 4 V), i.e., 4 V to 1 V. Output swing is limited to ~1.5 V below rails, so a 5 V system yields ~1.5 V to 3.5 V usable range. This configuration is validated in INA114BU/1K application circuits for portable surgical monitors.
INA114BU/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.6V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 2.2mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
INA114BU/1K FAQ
1.How can I place an order for INA114BU/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for INA114BU/1K 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 INA114BU/1K reliable?
The price and inventory of INA114BU/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA114BU/1K is usually 5 days.
3.What payment methods are accepted for INA114BU/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA114BU/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA114BU/1K?
INA114BU/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA114BU/1K 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 INA114BU/1K?
For technical support, including INA114BU/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA114BU/1K requirements.
6.How does Aetrix verify that INA114BU/1K is sourced from the original manufacturer or authorized distributors?
All INA114BU/1K 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 INA114BU/1K meets industry standards.
7.What is the process for return or replacement of INA114BU/1K?
All INA114BU/1K units undergo pre-shipment inspection (PSI). If there is an issue with INA114BU/1K, 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 INA114BU/1K part is unused and in its original packaging.
Return procedure for INA114BU/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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