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Texas Instruments INA2331AIPWR
- Part No.:
- INA2331AIPWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA2331AIPWR.pdf
- Description:
- IC INST AMP 2 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,801
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Product details
Overview
INA2331AIPWR from Texas Instruments is a dual-channel, rail-to-rail output, low-power CMOS instrumentation amplifier in TSSOP-14 package, configured with internal gain of 5 V/V, 415 µA per channel quiescent current, ±250 µV input offset voltage, and 2.0 MHz bandwidth - designed for precision sensor signal conditioning in industrial and medical systems.
For engineers reviewing the INA2331AIPWR datasheet, INA2331AIPWR pinout, INA2331AIPWR application, or INA2331AIPWR equivalent, key selection criteria include dual-channel integration, shutdown capability (0.01 µA), wide –55°C to +125°C operating range, and compatibility with single-supply (2.7–5.5 V) and bipolar-supply operation.
Technical Context
The INA2331AIPWR implements a modified two-op-amp instrumentation architecture with an integrated third gain stage, enabling high common-mode rejection (94 dB DC) and precise differential amplification without external gain-setting resistors for G = 5. Its CMOS input stage delivers 0.5 pA bias current and 10¹³ Ω input impedance.
Each channel features independent shutdown control, rail-to-rail output swing (within 25 mV of rails at G ≥ 10), and operates over full industrial temperature range with guaranteed performance at ±250 µV offset and 0.02% gain accuracy at G = 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain (fixed) | 5 V/V - internally set; eliminates need for external resistors in base configuration |
| Input Offset Voltage | ±250 µV - enables accurate low-level signal amplification (e.g., bridge sensors & RTDs) |
| CMRR | 94 dB DC - rejects line noise and harmonics in noisy industrial environments |
| Bandwidth | 2.0 MHz at G = 25 - supports direct driving of sampling ADCs up to ~100 kSPS |
| Quiescent Current | 415 µA per channel - suitable for battery-powered or multi-channel portable instrumentation |
| Shutdown Current | 0.01 µA per channel - nanosecond wake-up enables power cycling in energy-constrained systems |
| Operating Temp Range | –55°C to +125°C - qualified for automotive under-hood and industrial control cabinet use |
Pinout & Package
TSSOP-14 (PW) package with 0.65 mm pitch, 5.0 mm × 4.4 mm body, and exposed thermal pad (not electrically connected). RoHS-compliant, NIPDAU lead finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | Shutdown A / Shutdown B | Digital control inputs; <0.8 V triggers sleep mode (0.01 µA IQ); >2.5 V enables normal operation |
| 2, 13 | VOUTA / VOUTB | Rail-to-rail analog outputs; swing within 25 mV of rails at G ≥ 10 and RL ≥ 10 kΩ |
| 3, 12 | REFA / REFB | Reference voltage inputs; define zero-output level and affect common-mode input range |
| 4, 11 | V+ | Positive supply rail; accepts 2.7–5.5 V single supply or bipolar rails |
| 5, 10 | V– | Negative supply rail; tied to ground in single-supply configurations |
| 6, 9 | VIN+A / VIN+B | Non-inverting inputs; high-impedance (10¹³ Ω), low-bias (0.5 pA) for sensor interfacing |
| 7, 8 | VIN–A / VIN–B | Inverting inputs; matched with non-inverting inputs for optimal CMRR |
Key Features
| Feature | Design Value |
|---|---|
| Internal Gain = 5 V/V | Eliminates external resistor network for baseline configuration, reducing BOM count and layout sensitivity |
| 0.5 pA Input Bias Current | Minimizes error from high-impedance sources (e.g., thermistors, pH electrodes, piezoelectric sensors) |
| 94 dB DC CMRR | Maintains signal integrity in presence of EMI/RFI and power-line interference (50/60 Hz + harmonics) |
| 2.0 MHz Bandwidth @ G=25 | Enables fast settling (<1.7 µs to 0.1%) for time-critical data acquisition and closed-loop control |
| Dual Independent Shutdown | Allows per-channel power gating in multi-sensor systems without cross-talk or timing skew |
Applications
| Industrial Sensor Amplifier | Medical Physiological Monitor |
|---|---|
Use Scenario: Amplifying mV-level differential signals from strain-gauge bridges in factory-floor load cells and pressure transducers. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing fixed 5× gain, high CMRR, and rail-to-rail output to interface directly with 12-bit ADCs. Use Value: Delivers stable offset (±250 µV) and gain error (±0.02%) across –55°C to +125°C, ensuring calibration retention in uncontrolled environments. | Use Scenario: Front-end amplification of ECG electrode signals in portable patient monitors and fitness wearables. IC Role / Device Role / Timing Role: Dual-channel IA acquiring left/right arm differential potentials while rejecting common-mode motion artifacts and 50/60 Hz interference. Use Value: 0.5 pA bias current prevents electrode polarization; shutdown mode reduces system power by >99% during idle periods. |
| A/D Converter Signal Conditioning | Field Utility Metering |
Use Scenario: Driving sampling ADC inputs (e.g., ADS7818) in low-power data loggers with 100 kSPS throughput requirements. IC Role / Device Role / Timing Role: High-speed, low-noise buffer with 5 V/µs slew rate and 2.0 MHz bandwidth, minimizing aperture uncertainty. Use Value: Settles to 0.1% in 1.7 µs with 100 pF load, eliminating need for external op-amp buffering in cost-sensitive designs. | Use Scenario: Isolating and scaling current/voltage sensing in smart electricity meters compliant with IEC 62053. IC Role / Device Role / Timing Role: Dual-channel signal conditioner for shunt-based current measurement and transformer-coupled voltage sensing. Use Value: Dual independent channels enable simultaneous phase-current and neutral-current monitoring with matched gain and offset specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2128UA | Single-channel, 12-pin SOIC; higher offset (±500 µV), lower CMRR (80 dB), no shutdown | Lacks dual-channel integration and power gating; requires external gain resistors for all gains | Choose when board space allows discrete channel duplication and ultra-low power is not required |
| AD8226ARMZ | Single-channel, MSOP-8; rail-to-rail output, 1.5 MHz BW, 125 µV offset, but no shutdown | Higher precision offset but no dual-channel or shutdown; different pinout and reference handling | Prefer for highest DC accuracy in single-ended sensor chains where dual-channel consolidation is unnecessary |
Compared with INA2128UA and AD8226ARMZ, the INA2331AIPWR uniquely combines dual-channel integration, integrated 5× gain, shutdown capability, and extended temperature qualification - making it optimal for compact, low-power, multi-sensor industrial and medical front-ends.
Availability
INA2331AIPWR is available at Aetrix Electronics and suitable for industrial sensor amplifiers, medical physiological monitors, and field utility metering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for INA2331AIPWR 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 INA2331 belongs to TI's instrumentation amplifier product line, engineered for high-accuracy, low-power differential signal conditioning in harsh environments - targeting industrial automation, medical diagnostics, and energy metering.
FAQ
What is the gain configuration of the INA2331AIPWR?
The INA2331AIPWR is internally configured for a fixed gain of 5 V/V. External resistors can be added to increase gain beyond 5 using the equation G = 5 + (5R₂/R₁), but the default operation requires no external components. This simplifies design for standard sensor interfaces while retaining flexibility for higher-gain needs. The INA2331AIPWR maintains ±0.02% gain accuracy at G = 5 across temperature.
Does the INA2331AIPWR support single-supply operation?
Yes, the INA2331AIPWR operates from a single supply of +2.7 V to +5.5 V. Its rail-to-rail output stage swings within 25 mV of both rails when gain ≥ 10 and load ≥ 10 kΩ. The reference pins (REFA/REFB) must be biased within the common-mode range - typically at mid-supply for optimal performance. The INA2331AIPWR is fully specified across this range and over –55°C to +125°C.
How does the shutdown feature work on the INA2331AIPWR?
The INA2331AIPWR has independent shutdown pins (Pin 1 for Channel A, Pin 14 for Channel B). Pulling either pin below 0.8 V (at 5 V supply) places that channel into sleep mode, reducing quiescent current to 0.01 µA. Wake-up occurs in microseconds upon returning the pin above 2.5 V. This enables dynamic power management in multi-sensor systems without affecting the active channel. The INA2331AIPWR datasheet specifies shutdown behavior across supply and temperature.
What is the maximum common-mode input voltage for the INA2331AIPWR?
The upper limit of the common-mode input range for the INA2331AIPWR is V+ – 1.2 V, determined by the second-stage amplifier's input range. The lower limit depends on reference voltage and is defined by VOA1 = 5/4 VCM – 1/4 VREF. At VS = 5 V and VREF = 2.5 V, the usable common-mode range is approximately 0.55 V to 3.8 V. These limits are validated across –55°C to +125°C and documented in the INA2331AIPWR electrical characteristics table.
Can the INA2331AIPWR drive capacitive loads like ADC inputs directly?
Yes, the INA2331AIPWR is optimized to drive capacitive loads up to 100 pF with stable settling (1.7 µs to 0.1%). For heavier loads (e.g., >1 nF), external isolation or buffering (e.g., OPA340) is recommended. Its 5 V/µs slew rate and low output impedance at high frequencies make it suitable for direct connection to sampling ADCs such as the ADS7818. The INA2331AIPWR typical characteristics include load capacitance vs. overshoot and settling time plots.
INA2331AIPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 2
- 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:
- 1 mV
- Current - Supply:
- -
- 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:
- 14-TSSOP
INA2331AIPWR FAQ
1.How can I place an order for INA2331AIPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2331AIPWR 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 INA2331AIPWR reliable?
The price and inventory of INA2331AIPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2331AIPWR is usually 5 days.
3.What payment methods are accepted for INA2331AIPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2331AIPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2331AIPWR?
INA2331AIPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2331AIPWR 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 INA2331AIPWR?
For technical support, including INA2331AIPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2331AIPWR requirements.
6.How does Aetrix verify that INA2331AIPWR is sourced from the original manufacturer or authorized distributors?
All INA2331AIPWR 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 INA2331AIPWR meets industry standards.
7.What is the process for return or replacement of INA2331AIPWR?
All INA2331AIPWR units undergo pre-shipment inspection (PSI). If there is an issue with INA2331AIPWR, 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 INA2331AIPWR part is unused and in its original packaging.
Return procedure for INA2331AIPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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