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Texas Instruments INA111BUG4
- Part No.:
- INA111BUG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
INA111BUG4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,575
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Product details
Overview
INA111BUG4 from Texas Instruments (formerly Burr-Brown) is a high-speed, FET-input instrumentation amplifier optimized for precision DC-coupled signal conditioning in data acquisition and medical instrumentation. It delivers 450 kHz bandwidth at G = 100, 4 µs settling time to 0.01%, 106 dB minimum CMRR, ±500 µV max input offset voltage, and 20 pA max input bias current - enabling accurate amplification of low-level sensor signals with minimal loading.
For engineers reviewing the INA111BUG4 datasheet, INA111BUG4 pinout, INA111BUG4 application, or INA111BUG4 equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for medical-grade analog front-ends, bridge transducer interfaces, and high-impedance source conditioning where speed, low IB, and laser-trimmed DC accuracy are critical.
Technical Context
The INA111BUG4 employs a current-feedback topology that enables extended bandwidth (2 MHz at G = 1) and fast settling (4 µs @ G = 100, 0.01%) without sacrificing common-mode rejection. Its three-op-amp architecture isolates gain-setting resistors from input nodes, preserving high input impedance (>10¹² Ω) and minimizing bias current-induced errors.
Gain is set by a single external resistor RG per the equation G = 1 + 50 kΩ/RG, supporting programmable gains from 1 to 10,000. Laser-trimmed internal 25 kΩ and 10 kΩ metal-film resistors ensure stable gain accuracy and low drift, while the FET input stage maintains <20 pA bias current across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 2 MHz at G = 1; enables wideband sensor signal capture without phase distortion in ECG or strain-gauge systems. |
| Settling Time | 4 µs to 0.01% at G = 100; supports high-throughput multiplexed data acquisition with minimal inter-channel crosstalk. |
| Input Bias Current | 20 pA max; eliminates significant voltage drop across >1 MΩ source impedances (e.g., piezoelectric sensors). |
| CMRR | 106 dB min at G = 100; rejects line-frequency interference in unshielded biomedical electrode leads. |
| Input Offset Voltage | ±500 µV max; ensures sub-mV accuracy in bridge-based load cell outputs without manual trimming. |
| Supply Range | ±6 V to ±18 V; accommodates industrial ±15 V rails and battery-powered ±12 V designs without regulation overhead. |
| Operating Temp | –40°C to +85°C; qualified for embedded medical devices and industrial control environments. |
Pinout & Package
The INA111BUG4 is housed in a 16-pin SOIC (DW) surface-mount package with exposed pad thermal enhancement. Pin 12 is dedicated output sense feedback - required for stability and accuracy in remote-load applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16 | No Connect (NC) | Internally unused; must remain floating or grounded per layout guidelines to avoid parasitic coupling. |
| 12 | Output Sense Feedback | Direct connection to output pin (11) required for closed-loop stability; enables remote sensing at load terminals. |
| 11 | Output (VO) | Main amplified output referenced to Ref pin; drives 2 kΩ loads with ±12.7 V swing under full temperature range. |
| 10 | Reference (Ref) | Low-impedance ground reference point; 2 Ω series resistance degrades CMRR by ~10 dB at G = 1. |
| RG | Gain-Setting Resistor Terminal | Connects external RG between pins 1 and 8; sets gain per G = 1 + 50 kΩ/RG; values as low as 4.99 Ω supported. |
Key Features
| Feature | Design Value |
|---|---|
| FET Input Stage | 20 pA max input bias current enables direct interfacing with high-Z sources (e.g., pH electrodes, thermocouples) without guard traces or active bias networks. |
| Laser-Trimmed Offset | ±500 µV max initial offset and ±5 µV/°C max drift eliminate need for external nulling in portable diagnostic equipment. |
| Current-Feedback Architecture | Maintains 2 MHz bandwidth at unity gain and 450 kHz at G = 100 - outperforming voltage-feedback IAs in dynamic sensor applications. |
| Output Sense Pin (Pin 12) | Enables Kelvin-sensing of output voltage at remote loads, correcting for IR drop in long PCB traces or cable harnesses. |
| High-Speed Settling | 4 µs to 0.01% at G = 100 allows ≥250 kSPS sampling in multiplexed 12-bit ADC systems without settling-induced gain error. |
Applications
| ECG Signal Conditioning | Bridge Transducer Amplification |
|---|---|
|
Use Scenario: Amplifying microvolt-level differential cardiac signals from dry-electrode arrays in portable monitors. IC Role / Device Role / Timing Role: Primary instrumentation amplifier in analog front-end; provides programmable gain, high CMRR, and low noise before ADC sampling. Use Value: 20 pA input bias prevents electrode polarization drift; 4 µs settling supports 1 kHz sampling with <0.01% settling error. |
Use Scenario: Reading mV-level outputs from full-bridge strain gauges in industrial weighing systems. IC Role / Device Role / Timing Role: Precision gain block converting bridge imbalance to single-ended voltage for 24-bit sigma-delta ADC. Use Value: ±500 µV offset ensures ≤0.05% full-scale error at 1 mV/V sensitivity; laser trimming avoids factory calibration. |
| Thermocouple Interface | Isolated Data Acquisition Channel |
|
Use Scenario: Cold-junction compensation and linearization of Type-K thermocouple outputs in HVAC controllers. IC Role / Device Role / Timing Role: High-input-impedance amplifier with optional offset trim via Ref pin for zero-point adjustment. Use Value: 10¹² Ω input impedance prevents thermocouple self-heating; 5 µV/°C drift minimizes temperature-induced span error. |
Use Scenario: Galvanically isolated analog input channel using ISO122 transformer-coupled power and INA111BUG4 signal path. IC Role / Device Role / Timing Role: Isolation-side signal conditioner delivering high-fidelity, low-noise output to isolated ADC. Use Value: 106 dB CMRR rejects common-mode noise induced by isolation barrier; 2 MHz bandwidth preserves pulse fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128UA | Lower bandwidth (1.3 MHz @ G=1), higher CMRR (130 dB), 12-pin SOIC; no output sense pin. | Better for ultra-low-noise DC measurements (e.g., laboratory balances); unsuitable for remote-load sensing. | Select INA128UA when ultimate DC precision outweighs speed and remote sensing needs. |
| AD8421ARMZ | Higher slew rate (35 V/µs), wider supply (±2.5 V to ±18 V), 8-pin SOIC; no output sense pin. | Better for high-slew transient capture (e.g., pulse oximetry); lacks Kelvin feedback for load regulation. | Select AD8421ARMZ when driving capacitive loads or requiring rail-to-rail input beyond ±12 V. |
Compared with INA128UA and AD8421ARMZ, the INA111BUG4 uniquely combines current-feedback speed (450 kHz @ G=100), integrated output sense (pin 12), and FET-input low bias (20 pA) - making it optimal for multiplexed, remote-sensed, high-impedance sensor systems where both bandwidth and layout flexibility matter.
Availability
INA111BUG4 is available at Aetrix Electronics and suitable for medical instrumentation, industrial data acquisition, and precision transducer interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for INA111BUG4 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 acquired Burr-Brown in 2000 and maintains its precision analog portfolio, including instrumentation amplifiers, with focus on high-reliability, low-drift, and low-noise performance for mission-critical systems.
The INA111 series was designed specifically for high-speed, high-accuracy sensor signal conditioning in medical diagnostics and industrial test equipment - emphasizing FET input integrity, laser-trimmed DC specs, and current-feedback bandwidth scalability.
FAQ
What is the maximum gain achievable with the INA111BUG4?
The INA111BUG4 supports gains from 1 to 10,000 using the equation G = 1 + 50 kΩ/RG. At G = 10,000, RG = 5 Ω - requiring careful layout to minimize parasitic resistance. The INA111BUG4 maintains 50 kHz bandwidth and 30 µs settling time at this gain, verified per SBOS015 datasheet Figure 4.
Does the INA111BUG4 require external decoupling capacitors?
Yes - the INA111BUG4 requires 0.1 µF ceramic capacitors placed as close as possible to pins 4 (V+) and 5 (V–) to suppress high-frequency supply noise. This is mandatory for achieving specified CMRR and settling performance, especially in noisy industrial environments per INA111 datasheet Section "Application Information".
How does the output sense pin (Pin 12) function in the INA111BUG4?
Pin 12 is the dedicated output sense terminal for the INA111BUG4's SOIC package. It must be connected directly to pin 11 (VO) for standard operation. When driving remote loads, connecting Pin 12 to the load return point enables Kelvin-sensing, compensating for voltage drop in PCB traces or cables - a feature absent in the DIP version.
Can the INA111BUG4 operate with single-supply voltages?
No - the INA111BUG4 is specified only for dual-supply operation (±6 V to ±18 V). Its input common-mode range extends to ±12 V and output swing to ±12.7 V, requiring symmetric rails. For single-supply designs, consider TI's INA333 or ADI's AD8226 as alternatives with rail-to-rail input/output capability.
What is the thermal resistance (θJA) of the INA111BUG4 in its SOIC package?
The INA111BUG4 in 16-pin SOIC (DW) package has a junction-to-ambient thermal resistance (θJA) of 100°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour and thermal vias beneath the exposed pad.
INA111BUG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 17V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 3.3mA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 12 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
INA111BUG4 FAQ
1.How can I place an order for INA111BUG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA111BUG4 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 INA111BUG4 reliable?
The price and inventory of INA111BUG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA111BUG4 is usually 5 days.
3.What payment methods are accepted for INA111BUG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA111BUG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA111BUG4?
INA111BUG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA111BUG4 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 INA111BUG4?
For technical support, including INA111BUG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA111BUG4 requirements.
6.How does Aetrix verify that INA111BUG4 is sourced from the original manufacturer or authorized distributors?
All INA111BUG4 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 INA111BUG4 meets industry standards.
7.What is the process for return or replacement of INA111BUG4?
All INA111BUG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA111BUG4, 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 INA111BUG4 part is unused and in its original packaging.
Return procedure for INA111BUG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA111BUG4 Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
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LM324PWR
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LM2902PWR
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LM2902DR
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LM358P
Texas Instruments
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