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Texas Instruments INA116PAG4
- Part No.:
- INA116PAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
INA116PAG4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,784
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Product details
Overview
INA116PAG4 from Texas Instruments (formerly Burr-Brown) is an ultra-low-input-bias-current instrumentation amplifier designed for precision measurement of high-impedance sources. It delivers 3 fA typical input bias current at 25°C, ±2 mV max input offset voltage, and 84 dB CMRR at G = 10 - enabling accurate signal conditioning in pH meters, ion-selective electrodes, and leakage current test systems.
For engineers reviewing the INA116PAG4 datasheet, INA116PAG4 pinout, INA116PAG4 application, or INA116PAG4 equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for low-leakage instrumentation amplifier selection.
Technical Context
The INA116PAG4 uses a 3-op-amp monolithic FET-input topology with Difet® inputs and integrated guard drive circuitry to achieve sub-femtoamp bias current. Its gain is set by a single external resistor (RG), supporting 1–1000× range via G = 1 + 50 kΩ/RG.
It features dual buffered guard outputs (pins 1 & 16), ±40 V input over-voltage protection, and rail-to-rail output swing within ±0.7 V of supply rails under 10 kΩ load - all specified across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 3 fA typ at 25°C - enables stable DC measurement from >1014 Ω sources without drift. |
| CMRR | 84 dB at G = 10, ±11 V CMV - maintains accuracy despite large common-mode interference. |
| Input Offset Voltage | ±2 mV max - ensures ≤0.2% error at 1 V output with G = 1000. |
| Gain Range | 1 to 1000 - set by single RG resistor; supports flexible sensor scaling without redesign. |
| Supply Voltage | ±4.5 V to ±18 V - compatible with standard lab bench supplies and isolated industrial rails. |
| Bandwidth | 7 kHz at G = 1000 - sufficient for slow electrochemical and static charge measurements. |
| Quiescent Current | ±1.4 mA max - enables multi-channel designs with low thermal loading. |
Pinout & Package
INA116PAG4 is housed in a 16-pin SOIC (DW) package with 1.27 mm pitch, RoHS-compliant NIPDAUAG lead finish, and MSL Level-3 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | Guard Output (+) | Buffered low-impedance drive for PCB/cable shielding - reduces surface leakage by >100×. |
| 2, 3 | IN–, IN+ | FET-input differential pair - requires guarded traces and high-impedance bias paths (e.g., 100 MΩ resistors). |
| 4 | V– | Negative supply rail - must be decoupled with 0.1 µF capacitor near pin. |
| 5 | RG | External gain-setting resistor connection - determines gain as G = 1 + 50 kΩ/RG. |
| 6, 7 | V+, Ref | Positive supply and output reference - Ref must be low-impedance ground for optimal CMRR. |
| 8 | NC | No internal connection - left unconnected per datasheet. |
| 9, 11, 13 | NC | No internal connection - not bonded; electrically floating. |
| 10 | VO | Differential output - referenced to Ref; swings within ±0.7 V of supply rails. |
| 12, 14, 15 | NC | No internal connection - no internal bond wire or circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Buffered Guard Outputs | Drives PCB guards and coaxial cable shields directly - eliminates need for external op-amps in most pH/ion probe layouts. |
| Input Over-Voltage Protection | ±40 V absolute max - protects against accidental probe contact with power rails during calibration or fault conditions. |
| Laser-Trimmed On-Chip Resistors | 50 kΩ feedback network trimmed to ±0.05% - ensures stable gain accuracy without external trimming. |
| Low 0.1–10 Hz Noise | 2 µVp-p RTI - critical for stable DC baseline in long-duration ion concentration monitoring. |
| High Input Impedance | >1015 Ω || 0.2 pF - preserves signal integrity from glass pH electrodes and MEMS capacitive sensors. |
Applications
| pH Measurement Systems | Ion-Selective Electrode (ISE) Interfaces |
|---|---|
Use Scenario: Measuring hydrogen ion activity in aqueous solutions using glass electrode pairs with high source impedance (>1012 Ω). IC Role / Device Role / Timing Role: Precision instrumentation amplifier conditioning microvolt-level electrode potentials while rejecting common-mode noise from stirring motors or ambient EMI. Use Value: 3 fA input bias prevents electrode polarization drift, enabling <1 mV/h stability required for clinical-grade pH meters. | Use Scenario: Detecting trace concentrations of Na+, K+, or Ca2+ ions in biological fluids using polymer-membrane ISEs. IC Role / Device Role / Timing Role: Front-end signal conditioner converting nanovolt-level ion potential shifts into robust analog outputs for ADC digitization. Use Value: ±2 mV offset and 84 dB CMRR suppress thermal EMF and power supply ripple, ensuring <0.1% full-scale error in medical analyzers. |
| Leakage Current Testers | Capacitive Sensor Signal Chains |
Use Scenario: Quantifying insulation resistance in medical device cables or PCB conformal coatings using guarded 100 V bias and femtoamp sensing. IC Role / Device Role / Timing Role: Ultra-low-leakage transimpedance amplifier front-end measuring current through high-value feedback resistors (≥1012 Ω). Use Value: Guard drive pins eliminate board-level surface leakage, allowing reliable measurement down to 10 fA with <5% uncertainty. | Use Scenario: Reading displacement in MEMS accelerometers or humidity sensors where capacitance changes induce sub-picoamp currents. IC Role / Device Role / Timing Role: Charge amplifier converting sensor current into stable voltage while rejecting triboelectric noise from cable movement. Use Value: Buffered guard outputs suppress cable shield coupling, improving SNR by >20 dB in handheld diagnostic devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-bias-current instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA118PA | Higher input bias current (25 fA typ), lower CMRR (75 dB at G=10), same SOIC-16 footprint. | Less suitable for sub-10 fA leakage testing but adequate for general-purpose pH probes with shorter measurement intervals. | Select when cost sensitivity outweighs femtoamp performance requirements. |
| LMP8278MMX/NOPB | Current-sense amplifier architecture; 100 pA bias current, 120 dB CMRR, fixed G = 20 V/V. | Optimized for bidirectional current sensing up to ±10 A - not configurable for high-Z voltage amplification. | Choose only for shunt-based current monitoring; not a functional substitute for INA116PAG4's voltage-input role. |
Compared with INA116PAG4, INA118PA trades 8× higher input bias current for lower cost and wider availability, while LMP8278MMX/NOPB serves a fundamentally different current-sensing function - neither offers drop-in replacement capability due to architectural and specification mismatches.
Availability
INA116PAG4 is available at Aetrix Electronics and suitable for pH measurement systems, ion-selective electrode interfaces, leakage current testers, capacitive sensor signal chains, and laboratory instrumentation requiring stable component supply across extended product lifecycles.
Supply support for INA116PAG4 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 legacy high-performance instrumentation amplifiers.
The INA116 product line was engineered specifically for ultra-high-impedance electrochemical and scientific measurement applications where femtoamp-level input bias current is mandatory.
FAQ
What is the maximum input common-mode voltage range for INA116PAG4?
The INA116PAG4 supports a common-mode input voltage range from (V–) + 2.4 V to (V+) – 2 V at 25°C. This allows operation with inputs up to 2.4 V above the negative rail and 2 V below the positive rail - essential for interfacing with grounded-reference pH electrodes while maintaining full CMRR performance. The INA116PAG4 datasheet confirms this range applies specifically to the SOIC-16 variant under standard ±15 V supply conditions.
Does INA116PAG4 require external offset trimming in typical applications?
No, the INA116PAG4 is laser-trimmed for low offset voltage (±2 mV max) and low drift, eliminating the need for external trimming in most configurations. Only applications demanding sub-100 µV offset accuracy - such as metrology-grade calibration equipment - may require optional Ref-terminal adjustment using an external op-amp buffer, as documented in Figure 2 of the INA116PAG4 datasheet.
Can INA116PAG4 drive a 1000 pF capacitive load stably?
Yes, the INA116PAG4 is specified for stable operation with up to 1000 pF load capacitance, as stated in the "Load Capacitance Stability" parameter (1000 pF). This makes it suitable for driving long shielded cables or ADC input filters without oscillation - provided the Ref pin remains low-impedance and guard traces are properly implemented per the INA116PAG4 layout guidelines.
What is the purpose of the guard pins (pins 1 and 16) on INA116PAG4?
The guard pins on INA116PAG4 provide buffered, low-impedance outputs that drive PCB guard rings and coaxial cable shields to the same potential as the input terminals - reducing surface leakage currents by orders of magnitude. This is critical for preserving the 3 fA input bias current specification when measuring from glass electrodes or ion-selective membranes, and is explicitly validated in the INA116PAG4 application notes for pH and ISE systems.
Is INA116PAG4 pin-compatible with INA116UA or INA116UAG4?
Yes, INA116PAG4 is identical in pinout, package (SOIC-16), and electrical specifications to INA116UA and INA116UAG4 - all share the same DW package drawing, pin configuration, and absolute maximum ratings. The "G4" suffix denotes TI's green packaging standard (lead-free, RoHS-compliant), with no functional or mechanical differences affecting PCB layout or schematic design for the INA116PAG4.
INA116PAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Difet®
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
INA116PAG4 FAQ
1.How can I place an order for INA116PAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA116PAG4 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 INA116PAG4 reliable?
The price and inventory of INA116PAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA116PAG4 is usually 5 days.
3.What payment methods are accepted for INA116PAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA116PAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA116PAG4?
INA116PAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA116PAG4 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 INA116PAG4?
For technical support, including INA116PAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA116PAG4 requirements.
6.How does Aetrix verify that INA116PAG4 is sourced from the original manufacturer or authorized distributors?
All INA116PAG4 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 INA116PAG4 meets industry standards.
7.What is the process for return or replacement of INA116PAG4?
All INA116PAG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA116PAG4, 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 INA116PAG4 part is unused and in its original packaging.
Return procedure for INA116PAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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