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Texas Instruments INA826AIDGK
- Part No.:
- INA826AIDGK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA826AIDGK.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,364
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Product details
Overview
INA826AIDGK from Texas Instruments is a precision instrumentation amplifier optimized for low-power, wide-supply (3 V to 36 V), rail-to-rail output applications. It delivers 150 µV max input offset voltage, 104 dB min CMRR at G = 10, 1 MHz bandwidth at unity gain, 200 µA supply current, and operates across –40°C to +125°C - ideal for battery-powered ECG front-ends and industrial analog input modules.
For engineers reviewing the INA826AIDGK datasheet, INA826AIDGK pinout, INA826AIDGK application, or INA826AIDGK equivalent, this page provides verified technical context, validated pin functions, confirmed rail-to-rail output behavior, exact gain-setting resistor relationship (G = 1 + 49.4 kΩ/RG), and real-world alternatives with documented functional trade-offs.
Technical Context
The INA826AIDGK employs a three-op-amp architecture with separate input and output stages, enabling high common-mode rejection (≥100 dB up to 5 kHz at G = 10) and stable gain drift of only 35 ppm/°C for G > 1. Its input stage includes ±40 V overvoltage protection with current limiting to <8 mA, and its rail-to-rail output stage supports operation down to 3-V single supply.
Gain is set externally via a single resistor RG between pins 2 and 3, yielding programmable gain from 1 to 1000 per the equation G = 1 + 49.4 kΩ/RG. The REF pin (pin 6) accepts low-impedance reference voltage inputs with 1 V/V gain to output, supporting level-shifting in unipolar sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 3 V to 36 V single supply or ±1.5 V to ±18 V dual supply - enables direct interfacing with 3.3 V microcontrollers and legacy 24 V industrial rails. |
| Input Offset Voltage | 150 µV max (RTI) - ensures sub-millivolt error in precision bridge sensor amplification without trimming. |
| CMRR | 104 dB min at G = 10, DC–5 kHz - rejects line-frequency interference in noisy plant-floor environments. |
| Bandwidth | 1 MHz at G = 1, 60 kHz at G = 100 - supports fast-sampling biosignals (e.g., ECG) and moderate-speed process transmitters. |
| Quiescent Current | 200 µA - allows multi-year battery life in portable diagnostic equipment and wireless sensor nodes. |
| Rail-to-Rail Output | Swings within 150 mV of supply rails - maximizes dynamic range when using low-voltage supplies like 3.3 V or 5 V. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive sensors and industrial control cabinets. |
Pinout & Package
The INA826AIDGK is packaged in an 8-pin VSSOP (DGK) with 3.0 mm × 3.0 mm body size and exposed thermal pad connected internally to –VS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–IN) | Negative (inverting) input | Accepts differential signal's inverted side; high common-mode impedance (10 GΩ || 5 pF) minimizes loading on high-Z sources. |
| 2 (RG) | Gain-setting node | Connect external resistor RG between pin 2 and pin 3 to set gain per G = 1 + 49.4 kΩ/RG; no internal connection. |
| 3 (RG) | Gain-setting node | Completes gain-resistor path; open-circuit or shorting pins 2–3 yields G = 1; 49.4 kΩ yields G = 2. |
| 4 (+IN) | Positive (noninverting) input | Accepts differential signal's noninverted side; matched to pin 1 for optimal CMRR performance. |
| 5 (–VS) | Negative supply | Reference for internal circuitry; exposed thermal pad is internally tied to this pin - must be connected to system ground or negative rail. |
| 6 (REF) | Reference input | Drives output offset; requires low-impedance source (≤100 kΩ) to avoid gain error; adds 1× reference voltage to output. |
| 7 (VOUT) | Amplified output | Rail-to-rail capable; drives 10 kΩ loads with <150 mV headroom; stable with ≤1000 pF capacitive load. |
| 8 (+VS) | Positive supply | Primary power rail; supports wide input range up to 36 V; PSRR ≥100 dB ensures immunity to supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain programming | G = 1 to 1000 set by one external resistor (RG), eliminating complex DAC or digital interface for analog gain scaling. |
| ±40 V input overvoltage protection | Limits input current to <8 mA during fault conditions - eliminates need for external series resistors or clamps in field-connected sensors. |
| Low 200 µA quiescent current | Enables always-on monitoring in energy-constrained systems such as handheld medical devices and IoT edge nodes. |
| 104 dB min CMRR at G = 10 | Maintains accuracy in presence of 50/60 Hz noise and ground-loop offsets typical in industrial transmitters and flow meters. |
| Rail-to-rail output swing | Delivers full-scale output from (V–) + 0.1 V to (V+) – 0.15 V - preserves resolution when operating from 3.3 V or 5 V supplies. |
Applications
| Analog Input Module | Electrocardiogram (ECG) |
|---|---|
Use Scenario: Signal conditioning for 4–20 mA current loops and thermocouple inputs in PLC analog I/O cards. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing high CMRR, low offset, and wide supply range for industrial sensor interfacing. Use Value: Enables accurate 16-bit+ data acquisition without external calibration, even with long cable runs and shared ground references. |
Use Scenario: Front-end amplification of microvolt-level biopotential signals from dry or gel electrodes. IC Role / Device Role / Timing Role: Low-noise, low-drift instrumentation amplifier with rail-to-rail output for 3.3 V-powered portable ECG monitors. Use Value: Delivers 18 nV/√Hz input-referred noise at G ≥100 and 150 µV max offset - meets AHA clinical accuracy requirements. |
| Battery Test Equipment | Process Analytics (pH/Gas) |
Use Scenario: High-precision voltage and current sensing during charge/discharge cycling of Li-ion cells. IC Role / Device Role / Timing Role: Differential amplifier rejecting common-mode noise from switching power stages while measuring mV-level cell voltage deltas. Use Value: 100 dB PSRR and 200 µA IQ allow integration into compact, battery-operated testers with >10-hour runtime. |
Use Scenario: Amplifying low-level outputs from electrochemical pH probes and catalytic gas sensors in analytical instruments. IC Role / Device Role / Timing Role: Robust instrumentation amplifier with ±40 V input protection for direct connection to unshielded probe cables in corrosive lab environments. Use Value: Input overvoltage tolerance eliminates external protection diodes; –40°C to +125°C rating supports oven-controlled sensor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA333AIDGKR | Chopper-stabilized architecture; 25 µV VOS max, 0.1 µV/°C drift, but 50 µA IQ and 500 kHz BW at G = 100. | Better DC precision and lower drift, but lower bandwidth and no ±40 V input protection. | Select for ultra-low-offset DC measurements (e.g., strain gauge bridges); avoid where high CMRR at 5 kHz or rugged input protection is required. |
| AD8421ARMZ | 10 nV/√Hz noise, 100 dB CMRR at 10 kHz, but 1.2 mA IQ and ±15 V max supply - no 3 V operation. | Superior high-frequency CMRR and noise performance, but incompatible with low-voltage or battery-powered designs. | Select for high-speed, high-accuracy data acquisition (e.g., spectral analysis); avoid when supply flexibility or ultra-low power is mandatory. |
Compared with INA333AIDGKR and AD8421ARMZ, the INA826AIDGK uniquely balances 200 µA power, ±40 V ruggedness, 3–36 V supply range, and 104 dB CMRR up to 5 kHz - making it optimal for cost-sensitive, field-deployable industrial and medical sensors where robustness and efficiency outweigh extreme DC precision or RF-grade rejection.
Availability
INA826AIDGK is available at Aetrix Electronics and suitable for analog input modules, electrocardiogram (ECG) monitors, and battery test equipment requiring stable component supply, extended temperature support, and long-term industrial lifecycle assurance.
Supply support for INA826AIDGK 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 specializing in analog and embedded processing technologies, with decades of expertise in precision signal chain solutions.
The INA826AIDGK belongs to TI's precision instrumentation amplifier product line, designed specifically for low-power, wide-supply industrial and medical sensor signal conditioning where reliability, ruggedness, and ease of gain configuration are critical.
FAQ
What is the minimum supply voltage required for proper operation of the INA826AIDGK?
The INA826AIDGK supports a minimum single-supply voltage of 3 V and a minimum dual-supply of ±1.5 V. Operation below these levels is not guaranteed per the datasheet's Recommended Operating Conditions. At 3 V, the device maintains rail-to-rail output swing and specified CMRR, making it suitable for modern low-voltage systems. The INA826AIDGK must not be operated below 3 V to ensure functionality across the full –40°C to +125°C temperature range.
How is gain configured on the INA826AIDGK, and what resistor value sets G = 10?
Gain on the INA826AIDGK is set by an external resistor RG connected between pins 2 and 3, following the equation G = 1 + 49.4 kΩ/RG. To achieve G = 10, RG must be 5.489 kΩ (49.4 kΩ ÷ 9). Standard 1% E96 values like 5.49 kΩ or 5.62 kΩ yield G ≈ 10.00 or G ≈ 9.83, respectively. The INA826AIDGK does not support digital gain control - all gain adjustment is analog and resistor-based.
Does the INA826AIDGK require external input protection when interfacing with field sensors?
No - the INA826AIDGK integrates ±40 V input overvoltage protection on both input pins, limiting input current to less than 8 mA during fault conditions. This eliminates the need for external series resistors or clamping diodes in most industrial sensor applications. However, for sustained overvoltage beyond ±40 V or high-energy transients (e.g., lightning-induced surges), additional TVS protection remains recommended. The INA826AIDGK's built-in protection is sufficient for typical 24 V loop-powered sensor interfaces.
What is the maximum capacitive load the INA826AIDGK can drive while maintaining stability?
The INA826AIDGK is stable driving up to 1000 pF of capacitive load, as specified in the Electrical Characteristics table. Driving larger capacitances - such as ADC input capacitors or long PCB traces - may cause peaking or oscillation. For loads exceeding 1000 pF, a small series resistor (e.g., 10–50 Ω) between the INA826AIDGK output and the capacitive load restores phase margin. This requirement applies regardless of gain setting or supply voltage.
Can the REF pin of the INA826AIDGK be left floating or tied to ground?
No - the REF pin (pin 6) of the INA826AIDGK must be driven by a low-impedance source (≤100 kΩ) and must not be left floating or directly tied to ground unless intentional zero-reference operation is desired. Floating REF causes unpredictable output offset; grounding REF sets output mid-supply only if VCM is centered. For unipolar sensor interfaces, REF is commonly tied to a precision voltage (e.g., 1.25 V) to shift output into the ADC's valid range. The INA826AIDGK's REF input has 1 V/V gain and 200 kΩ input impedance - mismatched source impedances degrade CMRR.
INA826AIDGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 35 nA
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 200µA
- Current - Output / Channel:
- 16 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
INA826AIDGK FAQ
1.How can I place an order for INA826AIDGK through Aetrix?
Please submit a Request for Quotation (RFQ) for INA826AIDGK 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 INA826AIDGK reliable?
The price and inventory of INA826AIDGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA826AIDGK is usually 5 days.
3.What payment methods are accepted for INA826AIDGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA826AIDGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA826AIDGK?
INA826AIDGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA826AIDGK 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 INA826AIDGK?
For technical support, including INA826AIDGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA826AIDGK requirements.
6.How does Aetrix verify that INA826AIDGK is sourced from the original manufacturer or authorized distributors?
All INA826AIDGK 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 INA826AIDGK meets industry standards.
7.What is the process for return or replacement of INA826AIDGK?
All INA826AIDGK units undergo pre-shipment inspection (PSI). If there is an issue with INA826AIDGK, 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 INA826AIDGK part is unused and in its original packaging.
Return procedure for INA826AIDGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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