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Texas Instruments INA819ID
- Part No.:
- INA819ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA819ID.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:773
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Product details
Overview
INA819ID from Texas Instruments is a precision instrumentation amplifier optimized for low-noise, low-power, high-accuracy signal conditioning in industrial and medical sensor interfaces. It delivers 10 µV typical input offset voltage, 8 nV/√Hz input voltage noise, 2 MHz bandwidth at G = 1, ±60 V input overvoltage protection, and operates from ±2.25 V to ±18 V dual supply - enabling high-fidelity ECG front-ends and battery-powered process analytics.
For engineers reviewing the INA819ID datasheet, INA819ID pinout, INA819ID application, or INA819ID equivalent, key selection criteria include its 35 µV max offset, 385 µA max quiescent current, 110 dB min CMRR at G = 10, stable operation with 1-nF capacitive loads, and SOIC-8 package compatibility with legacy PCB layouts.
Technical Context
The INA819ID uses super-beta input transistors to achieve ultra-low input offset voltage (10 µV typ) and drift (0.4 µV/°C), while its three-op-amp architecture enables precise gain setting via a single external resistor (RG) between pins 2 and 3, supporting gains from 1 to 10,000. Its input stage includes integrated overvoltage protection circuitry rated to ±60 V relative to supplies.
It achieves 110 dB minimum common-mode rejection ratio at G = 10 and 110 dB minimum power-supply rejection ratio at G = 1, with guaranteed performance across –40°C to +125°C. The device maintains stability with up to 1-nF capacitive loads on the output and supports rail-to-rail output swing within 150 mV of each supply rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 35 µV (max) - ensures ≤350 µV error at G = 10, critical for sub-mV sensor signal fidelity |
| Input Voltage Noise | 8 nV/√Hz - enables clean amplification of microvolt-level biopotentials and strain gauge outputs |
| Bandwidth (G = 1) | 2 MHz - supports fast transient response in automated test equipment and flow meter pulse conditioning |
| Supply Current | 385 µA (max) - allows multi-channel, battery-operated designs with >1-year runtime on coin cells |
| Common-Mode Rejection | 110 dB (min, G = 10) - rejects 100,000:1 common-mode interference in noisy industrial environments |
| Input Overvoltage Protection | ±60 V - eliminates need for external clamping diodes in field-connected analog input modules |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive sensors and industrial process controllers |
Pinout & Package
INA819ID is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with standard JEDEC MS-012AC footprint. Pin 1 is –IN; pins 2 and 3 are RG (gain-setting resistor terminals); pin 4 is +IN; pin 5 is –VS; pin 6 is REF; pin 7 is OUT; pin 8 is +VS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–IN) | Negative input | Inverting input terminal; accepts differential signals referenced to common-mode range (V–)+2 V to (V+)-2 V |
| 2, 3 (RG) | Gain setting | External resistor between these pins sets gain per G = 1 + 50 kΩ/RG; no internal connection |
| 4 (+IN) | Positive input | Noninverting input terminal; matched to –IN for high CMRR; protected to ±60 V |
| 5 (–VS) | Negative supply | Connects to negative rail; thermal pad (in WSON variant) is internally tied to this pin |
| 6 (REF) | Reference input | DC bias level for output; must be driven by low-impedance source (≤40 kΩ) to avoid gain error |
| 7 (OUT) | Amplified output | Single-ended output capable of ±14.85 V swing on ±15 V supplies; stable with 1-nF load |
| 8 (+VS) | Positive supply | Accepts 4.5 V to 36 V single supply or ±2.25 V to ±18 V dual supply; decoupling required |
Key Features
| Feature | Design Value |
|---|---|
| Super-beta input stage | Delivers 10 µV typical offset and 0.4 µV/°C drift - reduces calibration frequency in portable diagnostics |
| Single-resistor programmable gain | G = 1 to 10,000 set by one external RG - simplifies BOM and layout vs. fixed-gain alternatives |
| Integrated ±60 V input protection | Eliminates external TVS diodes and series resistors - saves board space and improves reliability in field wiring |
| 1-nF capacitive load stability | Enables direct driving of ADC input filters or long cables without phase-margin compensation |
| Low 385 µA quiescent current | Supports always-on sensor nodes with <1 µA sleep current when combined with enable control (via REF or supply) |
Applications
| Analog Input Module | Electrocardiogram (ECG) |
|---|---|
Use Scenario: Industrial PLC analog input card acquiring 4–20 mA, thermocouple, and RTD signals in factory automation cabinets. IC Role / Device Role / Timing Role: Precision instrumentation amplifier conditioning low-level differential sensor outputs before 24-bit ΣΔ ADC conversion. Use Value: 110 dB CMRR suppresses 50/60 Hz mains pickup; ±60 V input protection withstands accidental 24 VDC field wiring shorts. |
Use Scenario: Portable ECG monitor capturing microvolt-level cardiac depolarization waveforms from dry electrodes. IC Role / Device Role / Timing Role: First-stage gain and common-mode rejection in lead-I/II/III front-end before digital filtering and display. Use Value: 8 nV/√Hz noise floor preserves P-wave and T-wave morphology; 35 µV max offset avoids baseline wander correction overhead. |
| Battery Test System | Process Analytics (pH/Gas) |
Use Scenario: Automated benchtop tester applying controlled charge/discharge pulses to Li-ion cells and measuring voltage decay. IC Role / Device Role / Timing Role: High-precision differential voltage amplifier measuring cell terminal voltage during dynamic load transients. Use Value: 2 MHz bandwidth captures fast voltage steps; 2 ppm/°C gain drift ensures measurement consistency across lab temperature variations. |
Use Scenario: In-line pH transmitter converting millivolt-level glass electrode output into 4–20 mA loop signal for SCADA systems. IC Role / Device Role / Timing Role: Low-drift, high-input-impedance amplifier interfacing high-Z electrochemical sensors with isolation barriers. Use Value: 100 GΩ || 4 pF common-mode impedance prevents sensor loading; –40°C to +125°C rating supports harsh chemical plant environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA821ID | 7 nV/√Hz noise (vs. 8 nV/√Hz), 27 MHz bandwidth at G = 1 (vs. 2 MHz), higher supply current (1.2 mA max) | Better suited for high-speed data acquisition where bandwidth >10 MHz is required | Select INA821ID only when >10× bandwidth gain-bandwidth product is needed; otherwise INA819ID offers superior power efficiency |
| INA828ID | 50 µV max offset (vs. 35 µV), 7 nV/√Hz noise, same 385 µA max IQ, lower cost | Acceptable for medium-accuracy industrial sensing where 15 µV additional offset is tolerable | Choose INA828ID for cost-sensitive volume production where 35 µV offset is not mandatory |
Compared with INA821ID and INA828ID, the INA819ID uniquely balances ultra-low offset (35 µV max), industry-leading 8-nV/√Hz noise, and ultra-low 385 µA supply current - making it optimal for battery-powered, high-accuracy medical and portable test equipment where power and precision are co-constrained.
Availability
INA819ID is available at Aetrix Electronics and suitable for analog input modules, electrocardiogram (ECG) monitors, and battery test systems requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for INA819ID 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The INA819ID belongs to TI's precision instrumentation amplifier product line, engineered specifically for high-accuracy, low-power sensor signal conditioning in demanding environments such as medical diagnostics and industrial process control.
FAQ
What is the maximum gain achievable with the INA819ID?
The INA819ID 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 G = 1000, the –3 dB bandwidth drops to 30 kHz, and gain error increases to ±0.05%.
Does the INA819ID require external components for basic operation?
Yes - the INA819ID requires an external gain-setting resistor (RG) between pins 2 and 3 to define gain, plus supply decoupling capacitors (≥0.1 µF ceramic near pins 5 and 8). The REF pin (pin 6) must be driven by a low-impedance source (≤40 kΩ) to maintain specified gain accuracy; floating REF defaults output to mid-supply.
Can the INA819ID operate from a single 5-V supply?
Yes - the INA819ID operates from a single supply as low as 4.5 V. With VS = 5 V, the input common-mode range is (V–)+2 V to (V+)–2 V, i.e., 2 V to 3 V, and output swings from ~150 mV to ~4.85 V. For rail-to-rail input capability at low supply, consider adding external level-shifting or using the REF pin to bias inputs.
How does the INA819ID handle input overvoltage conditions?
The INA819ID integrates robust input protection that withstands continuous ±60 V applied to either input pin relative to the supply rails. This eliminates the need for external clamping diodes in analog input modules exposed to field wiring faults. Internal protection limits input current to safe levels without latch-up or parametric shift.
Is the INA819ID pin-compatible with other members of the INA8xx family?
No - the INA819ID is not pin-compatible with INA818ID or INA828ID. While all share the same 8-pin SOIC package, the RG pins differ: INA819ID uses pins 2 and 3 for RG, whereas INA818ID and INA828ID use pins 1 and 8. Swapping them without PCB revision will result in incorrect or no gain.
INA819ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.9V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 150 pA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 350µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA819ID FAQ
1.How can I place an order for INA819ID through Aetrix?
Please submit a Request for Quotation (RFQ) for INA819ID 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 INA819ID reliable?
The price and inventory of INA819ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA819ID is usually 5 days.
3.What payment methods are accepted for INA819ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA819ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA819ID?
INA819ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA819ID 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 INA819ID?
For technical support, including INA819ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA819ID requirements.
6.How does Aetrix verify that INA819ID is sourced from the original manufacturer or authorized distributors?
All INA819ID 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 INA819ID meets industry standards.
7.What is the process for return or replacement of INA819ID?
All INA819ID units undergo pre-shipment inspection (PSI). If there is an issue with INA819ID, 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 INA819ID part is unused and in its original packaging.
Return procedure for INA819ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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