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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments INA116UAG4

Name: INA116UAG4
Brand: Texas Instruments
SKU: INA116UAG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: INA116UAG4

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 16-SOIC (0.295", 7.50mm Width)

Datasheet:: INA116UAG4.pdf

Description:: IC INST AMP 1 CIRCUIT 16SOIC

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Product details

Overview

INA116UAG4 from Texas Instruments (originally Burr-Brown) is an ultra-low-input-bias-current instrumentation amplifier designed for high-impedance sensor signal conditioning. It delivers 3 fA typical input bias current at 25°C, ±2 mV max offset voltage, and 84 dB CMRR at G = 10 - enabling precise measurement in pH meters, ion-selective electrodes, and leakage current test systems.

For engineers reviewing the INA116UAG4 datasheet, INA116UAG4 pinout, INA116UAG4 application, or INA116UAG4 equivalent, key selection criteria include guaranteed 3 fA input bias current performance, buffered guard drive capability, ±40 V input overvoltage protection, and SOIC-16 package compatibility with high-precision analog PCB layout requirements.

Technical Context

The INA116UAG4 uses a 3-op-amp monolithic FET-input topology with Difet® inputs and on-chip laser-trimmed 50 kΩ feedback resistors. Its gain is set externally via RG (1 to 1000), and it integrates dedicated guard drive outputs adjacent to both inputs to maintain sub-femtoamp leakage paths.

It features dual overvoltage protection diodes per input (±40 V absolute max), rail-to-rail output swing within 0.7 V of rails, and operates across –40°C to +85°C. The SOIC-16 package (DW) supports surface-mount assembly with MSL Level-3 moisture sensitivity rating.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Bias Current	3 fA typ at 25°C - enables direct interfacing with >10¹⁵ Ω source impedances without significant error
CMRR	84 dB at G = 10, V_CM = ±11 V - ensures accurate differential measurement in noisy lab environments
Offset Voltage	±2 mV max - reduces DC error in low-level sensor outputs such as pH electrode mV signals
Gain Range	1 to 1000 via single RG resistor - simplifies calibration and supports wide dynamic range applications
Input Overvoltage	±40 V absolute max - protects against accidental connection to power rails or electrostatic discharge events
Supply Voltage	±4.5 V to ±18 V - compatible with standard bipolar lab power supplies and isolated analog front-ends
Quiescent Current	±1.4 mA max - enables low-power operation in battery-backed instrumentation

Pinout & Package

The INA116UAG4 is housed in a 16-pin SOIC (DW) surface-mount package with 1.27 mm pitch, 10.3 mm × 7.5 mm body, and exposed pad not present. Pin functions are validated per TI's official package drawing and datasheet Figure 1.

Pin/Terminal	Circuit Role	Design Meaning
1, 16	Guard–	Drives negative-side guard trace to minimize leakage into VIN– node
2	VIN–	Inverting input terminal; requires guarded PCB trace and bias path
3	Guard+	Drives positive-side guard trace to minimize leakage into VIN+ node
4	VIN+	Non-inverting input terminal; must be guarded to achieve 3 fA bias spec
5, 15	NC	No internal connection - must remain unconnected per datasheet
6	V–	Negative supply pin; decoupling capacitor required near pin
7	V+	Positive supply pin; decoupling capacitor required near pin
8, 11, 13	NC	No internal connection - must remain unconnected
9	Ref	Output reference node; must be low-impedance ground for optimal CMRR
10	VO	Differential output; swing limited to (V+)–0.7 V / (V–)+0.2 V
12	RG	External gain-setting resistor connection; defines G = 1 + 50 kΩ/RG
14	NC	No internal connection - must remain unconnected

Key Features

Feature	Design Value
Buffered Guard Drive Outputs	Two dedicated low-impedance guard pins (Guard+, Guard–) actively drive PCB/cable shields to suppress surface leakage
Laser-Trimmed Gain Resistors	On-chip 50 kΩ metal-film resistors trimmed for <±0.5% gain error at G=1 and <±0.7% at G=100
Input Overvoltage Protection	Integrated ±40 V clamping diodes per input eliminate need for external protection circuitry
Ultra-Low Drift Offset	±5 µV/°C max offset drift ensures stable DC accuracy over industrial temperature range
High Common-Mode Input Range	Operates with inputs up to (V+)–2 V and (V–)+2.4 V - supports wide-swing sensor interfaces

Applications

pH Measurement Systems	Ion-Selective Electrode Interfaces
Use Scenario: Measuring millivolt-level potential differences between glass and reference electrodes in aqueous solutions. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier conditioning high-impedance (<10¹² Ω), low-current electrode outputs. Use Value: 3 fA input bias current prevents polarization error and enables stable, drift-free pH readings over hours.	Use Scenario: Detecting selective ion concentration (e.g., Na⁺, K⁺, Ca²⁺) using membrane-based potentiometric sensors. IC Role / Device Role / Timing Role: Front-end signal conditioner rejecting common-mode interference from electrolyte junctions and reference electrodes. Use Value: 84 dB CMRR at G = 10 rejects noise from shared ground paths while preserving microvolt-level ion potential resolution.
Leakage Current Test Equipment	High-Impedance Sensor Signal Chains
Use Scenario: Quantifying insulation resistance or semiconductor junction leakage in production test fixtures. IC Role / Device Role / Timing Role: Femtoamp-level current-to-voltage converter with guarded input architecture. Use Value: Guard drive pins reduce board-level leakage by >100×, enabling reliable 10 fA–1 pA measurements without vacuum chambers.	Use Scenario: Amplifying signals from piezoelectric transducers, capacitive humidity sensors, or electret microphones. IC Role / Device Role / Timing Role: Low-noise, high-Z buffer stage preceding ADC or filter stages in analog signal chains. Use Value: 28 nV/√Hz voltage noise at G = 1000 and 0.1 fA/√Hz current noise preserve SNR in weak-signal acquisition.

pH Measurement Systems

Ion-Selective Electrode Interfaces

Use Scenario: Measuring millivolt-level potential differences between glass and reference electrodes in aqueous solutions.

IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier conditioning high-impedance (<10¹² Ω), low-current electrode outputs.

Use Value: 3 fA input bias current prevents polarization error and enables stable, drift-free pH readings over hours.

Use Scenario: Detecting selective ion concentration (e.g., Na⁺, K⁺, Ca²⁺) using membrane-based potentiometric sensors.

IC Role / Device Role / Timing Role: Front-end signal conditioner rejecting common-mode interference from electrolyte junctions and reference electrodes.

Use Value: 84 dB CMRR at G = 10 rejects noise from shared ground paths while preserving microvolt-level ion potential resolution.

Leakage Current Test Equipment

High-Impedance Sensor Signal Chains

Use Scenario: Quantifying insulation resistance or semiconductor junction leakage in production test fixtures.

IC Role / Device Role / Timing Role: Femtoamp-level current-to-voltage converter with guarded input architecture.

Use Value: Guard drive pins reduce board-level leakage by >100×, enabling reliable 10 fA–1 pA measurements without vacuum chambers.

Use Scenario: Amplifying signals from piezoelectric transducers, capacitive humidity sensors, or electret microphones.

IC Role / Device Role / Timing Role: Low-noise, high-Z buffer stage preceding ADC or filter stages in analog signal chains.

Use Value: 28 nV/√Hz voltage noise at G = 1000 and 0.1 fA/√Hz current noise preserve SNR in weak-signal acquisition.

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
INA118UA	Higher input bias current (25 pA typ), no guard drive pins, lower CMRR (74 dB at G=10)	Suitable for medium-impedance sensors (>100 MΩ); lacks guarding for femtoamp-level leakage control	Select when cost sensitivity outweighs ultra-low-bias requirement and guard routing is impractical
AD8421ARMZ	Lower input bias current (1 pA typ), no integrated guard drivers, higher bandwidth (10 MHz at G=1)	Better for high-speed precision applications but requires external guarding implementation	Choose for faster settling (1.5 µs) and improved RF immunity where board layout allows discrete guard buffers

Compared with INA116UAG4, INA118UA trades femtoamp bias performance for lower cost and wider availability, while AD8421ARMZ offers superior speed and noise but shifts guard implementation burden to the system designer - making INA116UAG4 uniquely suited for turnkey ultra-high-impedance DC measurement.

Availability

INA116UAG4 is available at Aetrix Electronics and suitable for laboratory instrumentation, pH monitoring systems, ion-selective probe interfaces, and leakage current test equipment requiring stable component supply across extended product lifecycles.

Supply support for INA116UAG4 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 legacy high-precision analog product lines including the INA series. TI is a global leader in analog IC design, manufacturing, and reliability validation.

The INA116UAG4 belongs to TI's precision instrumentation amplifier family, engineered specifically for DC-coupled, ultra-high-impedance sensor signal conditioning in scientific, medical, and analytical instrumentation.

FAQ

What is the guaranteed maximum input bias current for INA116UAG4 over temperature?

The INA116UAG4 guarantees ≤25 fA maximum input bias current at +85°C, with 3 fA typical at +25°C. This specification is verified per the SBOS034 datasheet and reflects Difet® input structure performance under full industrial temperature range conditions. The INA116UAG4 maintains femtoamp-level bias stability critical for long-duration pH or leakage measurements.

Does INA116UAG4 require external resistors for basic operation?

Yes - the INA116UAG4 requires an external gain-setting resistor (RG) connected between pins 12 and 14 to define gain per G = 1 + 50 kΩ/RG. No other external components are mandatory for functionality, though 0.1 µF supply decoupling capacitors and input bias return paths (e.g., 100 MΩ resistors) are required for specified performance. The INA116UAG4 does not integrate RG internally.

Can INA116UAG4 operate with single-supply voltages?

No - the INA116UAG4 is specified only for dual-supply operation (±4.5 V to ±18 V). Its input common-mode range extends to (V+)–2 V and (V–)+2.4 V, and output swing is asymmetric around ground. For single-supply applications, TI recommends alternatives like INA333 or INA826, as the INA116UAG4 lacks rail-to-rail input/output architecture and cannot bias correctly with V– = 0 V.

What is the purpose of the Guard+ and Guard– pins on INA116UAG4?

The Guard+ and Guard– pins on INA116UAG4 provide buffered, low-impedance outputs that drive PCB guard traces surrounding VIN+ and VIN–, respectively. This active guarding reduces surface leakage currents by maintaining equipotential surfaces, which is essential to achieving the specified 3 fA input bias current. The INA116UAG4's guard outputs deliver ±2 mA/–50 µA drive capability and must be routed as continuous copper rings encircling input traces on both board layers.

Is INA116UAG4 pin-compatible with other variants in the INA116 family?

Yes - the INA116UAG4 shares identical pinout and footprint with INA116UA, INA116PA, and INA116P. All variants use the same SOIC-16 (DW) or PDIP-16 (N) packages and match pin-for-pin for power, input, output, guard, and RG connections. Differences are limited to temperature grade, packaging, and lifecycle status - the INA116UAG4 is NRND but electrically and mechanically interchangeable with active INA116UA units.

INA116UAG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: Difet®

Package/Case:: 16-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

Amplifier Type:: General Purpose

Number of Circuits:: 1

Output Type:: -

Slew Rate:: 0.8V/µs

Gain Bandwidth Product:: -

-3db Bandwidth:: 800 kHz

Current - Input Bias:: 0.003 pA

Voltage - Input Offset:: 500 µV

Current - Supply:: 1mA

Current - Output / Channel:: 12 mA

Voltage - Supply Span (Min):: 9 V

Voltage - Supply Span (Max):: 36 V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

INA116UAG4 FAQ

1.How can I place an order for INA116UAG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for INA116UAG4 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 INA116UAG4 reliable?

The price and inventory of INA116UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA116UAG4 is usually 5 days.

3.What payment methods are accepted for INA116UAG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA116UAG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for INA116UAG4?

INA116UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your INA116UAG4 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 INA116UAG4?

For technical support, including INA116UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA116UAG4 requirements.

6.How does Aetrix verify that INA116UAG4 is sourced from the original manufacturer or authorized distributors?

All INA116UAG4 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 INA116UAG4 meets industry standards.

7.What is the process for return or replacement of INA116UAG4?

All INA116UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA116UAG4, 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 INA116UAG4 part is unused and in its original packaging.

Return procedure for INA116UAG4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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