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Texas Instruments INA118UBG4
- Part No.:
- INA118UBG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA118UBG4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,136
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Product details
Overview
INA118UBG4 from Texas Instruments is a precision, low-power instrumentation amplifier designed for high-accuracy signal conditioning of low-level differential signals in the presence of large common-mode voltages. It delivers 50 µV max offset voltage, 0.5 µV/°C max drift, 110 dB min CMR at G = 1000, ±2.25 V to ±18 V dual supply operation, and 350 µA quiescent current - making it suitable for battery-powered pressure transmitters and ECG front-ends.
For engineers reviewing the INA118UBG4 datasheet, INA118UBG4 pinout, INA118UBG4 application, or INA118UBG4 equivalent, key selection considerations include its laser-trimmed DC accuracy, JFET-input overvoltage protection (±40 V), single-resistor gain setting (G = 1 to 10000), wide input common-mode range (V– + 2 V to V+ – 2 V), and SOIC-8 packaging for space-constrained industrial sensing designs.
Technical Context
The INA118UBG4 uses a three-op-amp architecture with current-feedback input stages built on JFET input transistors, enabling 70 kHz bandwidth at G = 100 while maintaining low noise (10 nV/√Hz at 1 kHz) and robust ±40 V input protection. Its gain is set by a single external resistor (RG) between pins 1 and 8, referencing the internal 50 kΩ laser-trimmed feedback network.
It operates across –40°C to +125°C ambient temperature, supports rail-to-rail output swing (V– + 0.35 V to V+ – 0.8 V at RL = 10 kΩ), and maintains 110 dB CMR up to 100 Hz at G = 1000. Input bias current remains ≤5 nA max, and the Ref pin allows output level shifting without degrading CMR when driven with low impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset voltage | 50 µV maximum - enables accurate measurement of sub-millivolt sensor signals without calibration drift. |
| CMR | 110 dB minimum at G = 1000 - rejects 60 Hz ground-loop interference in industrial transmitters. |
| Supply range | ±2.25 V to ±18 V - supports both low-voltage portable systems and high-voltage industrial rails. |
| Quiescent current | 350 µA - extends battery life in wireless sensor nodes and portable medical devices. |
| Input protection | ±40 V continuous - eliminates need for external clamping diodes in harsh industrial environments. |
| Bandwidth | 70 kHz at G = 100 - captures dynamic signals from vibration sensors and strain gauges. |
| Gain range | 1 to 10000 via single RG resistor - simplifies design iteration and reduces BOM count vs fixed-gain alternatives. |
Pinout & Package
INA118UBG4 is supplied in an 8-pin SOIC (SO-8) package with nominal body size 3.91 mm × 4.90 mm, optimized for surface-mount assembly and thermal performance (RθJA = 115°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG | External gain-setting node - connect resistor between pins 1 and 8 to set G = 1 + 50 kΩ/RG; open-circuit yields G = 1. |
| 2 | V– IN | Inverting input - accepts differential signal referenced to system ground or floating source. |
| 3 | V+ IN | Non-inverting input - paired with Pin 2 for differential input; protected to ±40 V independent of supply state. |
| 4 | V– | Negative power supply - must be decoupled locally; supports operation down to –2.25 V. |
| 5 | Ref | Output reference - sets output common-mode level; requires low-impedance drive (<12 Ω) to preserve CMR. |
| 6 | VO | Analog output - delivers amplified, referenced differential signal; swing limited to V– + 0.35 V to V+ – 0.8 V. |
| 7 | V+ | Positive power supply - must be decoupled locally; supports operation up to +18 V. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset & drift | 50 µV max offset and 0.5 µV/°C max drift - eliminates need for system-level nulling in weigh scale and temperature transmitter calibration. |
| JFET input protection | ±40 V fault tolerance with 6 mA current limiting - protects against sensor wiring faults and ESD without external components. |
| Single-resistor gain configuration | G = 1 + 50 kΩ/RG - enables rapid gain changes during prototyping and field calibration without PCB redesign. |
| Wide common-mode input range | V– + 2 V to V+ – 2 V - accommodates high common-mode offsets in bridge-based pressure sensors and thermocouple interfaces. |
| Low-noise, low-power operation | 10 nV/√Hz @ 1 kHz and 350 µA IQ - balances resolution and energy efficiency in battery-powered data acquisition systems. |
Applications
| Pressure Transmitter | ECG Front-End |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge output from piezoresistive pressure sensors in HVAC or process control systems, where ground loops introduce 60 Hz common-mode interference. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing differential gain, high CMR, and input overvoltage protection before ADC digitization. Use Value: 110 dB CMR at G = 1000 suppresses ground-loop noise, while ±40 V input tolerance prevents damage during sensor cable disconnect events. |
Use Scenario: Conditioning microvolt-level biopotential signals from ECG electrodes in portable patient monitors, operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Low-power, low-drift signal conditioner that preserves ST-segment fidelity while rejecting muscle artifact and power-line noise. Use Value: 350 µA quiescent current extends battery runtime, and 50 µV offset ensures baseline stability across body temperature variations. |
| Weigh Scale Load Cell | Analog Input Module |
Use Scenario: Amplifying 2–20 mV full-scale output from strain-gauge load cells in industrial weighing systems with long sensor cables and noisy factory power. IC Role / Device Role / Timing Role: High-accuracy instrumentation amplifier with rail-compatible output swing and stable gain over temperature. Use Value: Laser-trimmed 0.5 µV/°C drift minimizes temperature-induced zero-point error, critical for NTEP-certified metrology applications. |
Use Scenario: Signal conditioning stage in modular PLC analog input cards accepting multiple sensor types (RTD, thermocouple, 4–20 mA) with shared power and isolation boundaries. IC Role / Device Role / Timing Role: Configurable gain amplifier supporting programmable input ranges via RG selection and reference pin biasing. Use Value: Single-resistor gain scaling (G = 1–10000) and Ref pin flexibility enable one hardware design to support multiple sensor standards without component change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA818IDR | Lower offset (35 µV max), lower input bias current (0.5 nA max), and lower noise (8 nV/√Hz) at same 350 µA IQ. | Better suited for ultra-low-level biopotential or nanovolt thermocouple measurements requiring higher DC precision. | Select INA818IDR when offset drift and input current dominate system error budget; note RG pins differ (1 & 8 vs 2 & 3). |
| INA828IDR | Same 50 µV offset spec as INA118UBG4 but improved noise (7 nV/√Hz) and wider bandwidth (120 kHz at G = 100). | Preferred for higher-speed DAQ systems needing faster settling (21 µs at G = 100) and better AC performance. | Choose INA828IDR for new designs prioritizing noise-bandwidth trade-off; pinout and gain equation match INA118UBG4. |
Compared with INA118UBG4, INA818IDR improves DC precision at no IQ penalty but requires layout adjustment for RG placement, while INA828IDR offers superior AC performance with full pin-and-gain compatibility - making it a drop-in upgrade for noise-sensitive, medium-speed applications.
Availability
INA118UBG4 is available at Aetrix Electronics and suitable for pressure transmitters, ECG monitors, weigh scale systems, and analog input modules requiring stable component supply across industrial and medical production cycles.
Supply support for INA118UBG4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The INA118UBG4 belongs to TI's precision instrumentation amplifier product line, engineered specifically for high-accuracy, low-power signal conditioning in sensor interface applications where DC precision, input protection, and gain flexibility are critical.
FAQ
What is the maximum supply voltage rating for the INA118UBG4?
The INA118UBG4 has an absolute maximum supply voltage rating of ±18 V. Operation beyond this limit risks permanent device damage. For reliable long-term use, TI specifies recommended operating conditions from ±2.25 V to ±18 V, with typical performance characterized at ±15 V. The INA118UBG4 must not be subjected to supply transients exceeding ±18 V, even momentarily.
How is gain configured on the INA118UBG4?
Gain on the INA118UBG4 is set by a single external resistor RG connected between pins 1 and 8, using the equation G = 1 + 50 kΩ/RG. This allows precise gain selection from 1 to 10000. For G = 1, RG is left unconnected. The internal 50 kΩ resistors are laser-trimmed, so gain accuracy depends on both RG tolerance and temperature coefficient - 1% metal-film resistors are recommended for gains above 100.
Does the INA118UBG4 require external input protection diodes?
No, the INA118UBG4 does not require external input protection diodes. Its JFET-input structure provides inherent ±40 V continuous input voltage protection, even when power supplies are disconnected. Internal circuitry limits input current to approximately 6 mA during overload, safeguarding the device without adding noise or offset error - a key advantage over op-amp-based discrete instrumentation amplifier designs.
What is the input common-mode voltage range for the INA118UBG4?
The linear input common-mode voltage range for the INA118UBG4 is specified as V– + 2 V to V+ – 2 V under recommended operating conditions. This range ensures proper operation of the input amplifiers and maintains specified CMR and gain accuracy. Exceeding these limits may cause clipping or degraded performance, especially at high gains. The actual usable range also depends on output swing constraints and reference voltage setting.
Can the INA118UBG4 operate from a single supply?
Yes, the INA118UBG4 can operate from a single supply (e.g., V+ = 4.5 V, V– = 0 V), but its input common-mode and output swing ranges are reduced. In single-supply mode, the linear input range becomes 0.2 V to 4.3 V, and output swing is limited to 60 mV to 2 V. To maintain optimal performance, the Ref pin must be biased appropriately (e.g., to mid-supply), and input signals must stay within the constrained common-mode window - verified in Figure 7-5 and Figure 7-6 of the INA118UBG4 datasheet.
INA118UBG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.9V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 800 kHz
- Current - Input Bias:
- 1 nA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 350µA
- Current - Output / Channel:
- 12 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA118UBG4 FAQ
1.How can I place an order for INA118UBG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA118UBG4 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 INA118UBG4 reliable?
The price and inventory of INA118UBG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA118UBG4 is usually 5 days.
3.What payment methods are accepted for INA118UBG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA118UBG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA118UBG4?
INA118UBG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA118UBG4 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 INA118UBG4?
For technical support, including INA118UBG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA118UBG4 requirements.
6.How does Aetrix verify that INA118UBG4 is sourced from the original manufacturer or authorized distributors?
All INA118UBG4 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 INA118UBG4 meets industry standards.
7.What is the process for return or replacement of INA118UBG4?
All INA118UBG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA118UBG4, 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 INA118UBG4 part is unused and in its original packaging.
Return procedure for INA118UBG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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