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Texas Instruments INA331AIDGKTG4
- Part No.:
- INA331AIDGKTG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA331AIDGKTG4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,647
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Product details
Overview
INA331AIDGKTG4 from Texas Instruments is a rail-to-rail output, low-power CMOS instrumentation amplifier optimized for single-supply sensor signal conditioning. It delivers 5 V/V fixed internal gain (±0.02% accuracy), 2.0 MHz bandwidth, 94 dB DC CMRR, ±250 µV max input offset voltage, and operates from –55°C to +125°C - enabling precision bridge, RTD, and ECG front-ends in battery-powered industrial and medical systems.
For engineers reviewing the INA331AIDGKTG4 datasheet, INA331AIDGKTG4 pinout, INA331AIDGKTG4 application, or INA331AIDGKTG4 equivalent, key selection criteria include its 415 µA quiescent current, shutdown mode (0.01 µA), MSOP-8 package compatibility, and verified performance at 2.7–5.5 V supply with rail-to-rail output swing within 25 mV of rails under 10 kΩ load.
Technical Context
The INA331AIDGKTG4 implements a modified two-op-amp instrumentation architecture with an integrated third gain stage, enabling accurate differential-to-single-ended conversion while maintaining high common-mode rejection up to 45 kHz. Its CMOS input stage provides 0.5 pA bias current and 10¹³ Ω input impedance, supporting high-impedance sensors without loading.
Gain is internally set to 5 V/V but scalable beyond via external resistors using G = 5 + (5R₂/R₁); the reference pin defines output zero level and directly impacts common-mode input range. Shutdown activation occurs when the dedicated pin drops below 0.8 V (at 5 V supply), reducing current to 0.01 µA with microsecond wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7 V to +5.5 V - supports direct integration into 3.3 V and 5 V embedded systems without level-shifting. |
| Quiescent Current | 415 µA max per channel - enables multi-channel, battery-operated data acquisition with minimal power budget impact. |
| Input Offset Voltage | ±250 µV max - ensures sub-0.1% error in 100 mV full-scale bridge measurements without trimming. |
| CMRR | 94 dB at DC, 50 dB at 45 kHz - rejects line-frequency interference and harmonics in noisy industrial environments. |
| Bandwidth & Slew Rate | 2.0 MHz @ G = 25, 5 V/µs - sufficient for direct driving of sampling ADCs like ADS7818 at ≤100 kHz update rates. |
| Rail-to-Rail Output | Swings to within 25 mV of V+ and V− under 10 kΩ load - maximizes dynamic range in single-supply configurations. |
| Operating Temperature | –55°C to +125°C - qualified for under-hood automotive, downhole, and industrial control applications. |
Pinout & Package
The INA331AIDGKTG4 is housed in an 8-pin MSOP (DGK) package - 3.0 mm × 3.0 mm, 0.65 mm pitch, exposed thermal pad - optimized for space-constrained PCB layouts and thermal performance in compact sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RG) | Gain-setting resistor connection | Shorted to VOUT for G = 5; connects external R₁/R₂ network for G > 5 per G = 5 + (5R₂/R₁). |
| 2 (VIN–) | Inverting input | Differential input terminal; requires matched bias current return path for optimal CMRR and offset stability. |
| 3 (VIN+) | Non-inverting input | Differential input terminal; high-impedance CMOS node (10¹³ Ω) minimizes source loading on bridges or thermistors. |
| 4 (V–) | Negative supply | Connects to ground or negative rail; input common-mode range extends to (V–) – 0.5 V with diode clamping. |
| 5 (Shutdown) | Active-low enable control | Pulled high to V+ for normal operation; driven <0.8 V to enter 0.01 µA shutdown with microsecond wake-up. |
| 6 (V+) | Positive supply | Accepts 2.7–5.5 V; requires local 0.1 µF decoupling for noise immunity in high-impedance sensor interfaces. |
| 7 (VOUT) | Amplified output | Single-ended output referenced to REF; capable of driving 10 kΩ loads with <0.1% gain error and rail-to-rail swing. |
| 8 (REF) | Output reference level | Sets zero-output voltage; must be low-impedance (<160 Ω series) to preserve 94 dB CMRR; influences input common-mode range. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed gain accuracy | ±0.02% at G = 5 ensures stable calibration over temperature (2 ppm/°C drift), reducing system-level trimming effort. |
| Ultra-low input bias current | 0.5 pA typical enables use with >1 MΩ source impedances (e.g., piezoelectric sensors, pH electrodes) without signal degradation. |
| Integrated shutdown mode | 0.01 µA quiescent current during sleep allows duty-cycled operation in portable ECG or IoT edge nodes. |
| Wide common-mode input range | 0.35 V to (V+) – 1.2 V at 2.7 V supply - accommodates unbuffered bridge outputs and thermocouple signals without level-shifting. |
| High-frequency CMRR retention | 50 dB at 45 kHz maintains noise rejection for switched-mode power supply harmonics and motor drive emissions. |
Applications
| Industrial Sensor Amplifier | Physiological Signal Acquisition |
|---|---|
Use Scenario: Amplifying mV-level differential output from a 350 Ω strain-gauge Wheatstone bridge in a factory-floor load cell. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing fixed 5× gain, rejecting 50/60 Hz line noise, and driving 16-bit SAR ADC with minimal settling time. Use Value: Achieves <0.05% nonlinearity and 120 dB SNR at 1 kHz due to 2.0 MHz bandwidth and 94 dB CMRR, eliminating need for external filtering stages. | Use Scenario: Front-end amplification of differential ECG signals from limb electrodes in a wearable fitness monitor. IC Role / Device Role / Timing Role: Low-noise, low-power IA conditioning biopotential signals while rejecting common-mode motion artifacts and RF interference. Use Value: 0.5 pA bias current prevents electrode polarization; 415 µA IQ enables >7-day battery life in continuous 250 SPS monitoring mode. |
| A/D Converter Driver | Field Utility Meter Interface |
Use Scenario: Directly driving ADS7818 12-bit sampling ADC in a portable multimeter with 100 kHz update rate. IC Role / Device Role / Timing Role: High-slew-rate (5 V/µs), rail-to-rail output buffer ensuring full-scale step response settles within 1.7 µs (0.1%) to avoid aperture uncertainty. Use Value: Eliminates need for external op-amp buffer; 25 mV rail margin preserves 4.95 V output swing at 5 V supply for maximum ADC utilization. | Use Scenario: Isolating and amplifying current-sense shunt voltage in a smart electricity meter with Class 0.5 accuracy requirement. IC Role / Device Role / Timing Role: High-precision, temperature-stable IA rejecting common-mode transients from switching power supplies and relay coils. Use Value: ±250 µV offset and 2 ppm/°C drift ensure <0.1% gain error across –25°C to +70°C operating range, meeting IEC 62053 metrology standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA333AIDGKT | Lower IQ (175 µA), improved offset (±50 µV), same MSOP-8 package and pinout. | Better suited for ultra-low-power, high-accuracy applications where 2.0 MHz bandwidth is sufficient. | Select INA333AIDGKT if system prioritizes lowest possible power and tighter offset spec; retains identical layout and gain configuration. |
| AD8221ARMZ | Higher bandwidth (850 kHz @ G=1000), bipolar supply only, SOIC-8 package, no shutdown pin. | Preferred for high-gain, wide-bandwidth industrial DAQ where dual supply is available and shutdown is unnecessary. | Choose AD8221ARMZ when >1 MHz bandwidth at G≥100 is required and board space allows SOIC-8; not drop-in due to different pinout and no shutdown. |
Compared with INA333AIDGKT, the INA331AIDGKTG4 offers higher bandwidth and lower cost but consumes more current; versus AD8221ARMZ, it enables single-supply operation and shutdown capability at the expense of maximum gain-bandwidth product and bipolar-only support.
Availability
INA331AIDGKTG4 is available at Aetrix Electronics and suitable for industrial sensor amplifiers, physiological signal acquisition, and A/D converter driver applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for INA331AIDGKTG4 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 components.
The INA331 family was designed specifically for low-cost, low-power, single-supply instrumentation amplifier applications in industrial sensing, medical diagnostics, and portable test equipment - emphasizing rail-to-rail output, shutdown capability, and wide temperature operation.
FAQ
What is the gain configuration of the INA331AIDGKTG4?
The INA331AIDGKTG4 features a fixed internal gain of 5 V/V, laser-trimmed to ±0.02% accuracy. Gain can be increased beyond 5 V/V by connecting external resistors between pins 1 (RG), 5, and 6 using the equation G = 5 + (5R₂/R₁). No external resistors are needed for G = 5 - simply short RG to VOUT (pin 7).
Does the INA331AIDGKTG4 support true rail-to-rail output swing?
Yes - the INA331AIDGKTG4 achieves rail-to-rail output swing within 25 mV of both V+ and V− when driving ≥10 kΩ loads. This capability holds across the full –55°C to +125°C temperature range and enables full utilization of 3.3 V or 5 V ADC input ranges without level-shifting circuitry.
How does the shutdown feature of the INA331AIDGKTG4 operate?
The INA331AIDGKTG4 enters ultra-low-power shutdown mode (0.01 µA IQ) when the Shutdown pin (pin 5) is driven below 0.8 V (at 5 V supply). Wake-up time is under 1 µs, making it ideal for duty-cycled sensor nodes. During shutdown, the output enters high-impedance state - useful for multiplexed analog front-ends.
What is the recommended power supply decoupling for the INA331AIDGKTG4?
Texas Instruments specifies 0.1 µF ceramic capacitors placed as close as possible to both V+ (pin 6) and V– (pin 4), with short traces to minimize inductance. For noisy environments or high-impedance sensor sources, adding a 10 µF bulk capacitor nearby further stabilizes supply rails and improves PSRR above 10 kHz.
Can the INA331AIDGKTG4 drive capacitive loads such as ADC inputs directly?
Yes - the INA331AIDGKTG4 is characterized to drive up to 100 pF capacitive loads while maintaining stability and 0.1% settling in ≤1.7 µs. For heavier capacitive loads (>100 pF), a small series resistor (10–50 Ω) between VOUT and the ADC input is recommended to isolate the capacitance and prevent peaking or oscillation.
INA331AIDGKTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 415µA
- Current - Output / Channel:
- 48 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
INA331AIDGKTG4 FAQ
1.How can I place an order for INA331AIDGKTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA331AIDGKTG4 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 INA331AIDGKTG4 reliable?
The price and inventory of INA331AIDGKTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA331AIDGKTG4 is usually 5 days.
3.What payment methods are accepted for INA331AIDGKTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA331AIDGKTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA331AIDGKTG4?
INA331AIDGKTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA331AIDGKTG4 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 INA331AIDGKTG4?
For technical support, including INA331AIDGKTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA331AIDGKTG4 requirements.
6.How does Aetrix verify that INA331AIDGKTG4 is sourced from the original manufacturer or authorized distributors?
All INA331AIDGKTG4 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 INA331AIDGKTG4 meets industry standards.
7.What is the process for return or replacement of INA331AIDGKTG4?
All INA331AIDGKTG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA331AIDGKTG4, 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 INA331AIDGKTG4 part is unused and in its original packaging.
Return procedure for INA331AIDGKTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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