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Texas Instruments INA2331AIPWT
- Part No.:
- INA2331AIPWT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA2331AIPWT.pdf
- Description:
- IC INST AMP 2 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:636
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Product details
Overview
INA2331AIPWT from Texas Instruments is a dual-channel, rail-to-rail output, low-power CMOS instrumentation amplifier in TSSOP-14 package, delivering 5 V/V fixed internal gain (extendable to 1000 V/V with external resistors), ±250 µV input offset voltage, and 2.0 MHz bandwidth at G = 25 - optimized for precision sensor signal conditioning in battery-powered industrial and medical systems.
For engineers reviewing the INA2331AIPWT datasheet, INA2331AIPWT pinout, INA2331AIPWT application, or INA2331AIPWT equivalent, this page provides verified technical context, real-world design meaning of key specs, validated dual-channel pin configuration, application-specific use cases, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The INA2331AIPWT implements a modified three-op-amp instrumentation architecture with an integrated gain stage, enabling high common-mode rejection (94 dB DC) and low input bias current (0.5 pA) while maintaining rail-to-rail output swing down to 25 mV from rails at G ≥ 10. Its shutdown pin reduces quiescent current to 0.01 µA per channel, supporting microsecond wake-up in multi-channel portable systems.
Designed for single-supply operation from +2.7 V to +5.5 V, it features internally trimmed gain accuracy (±0.02% at G = 5), low temperature drift (±2 ppm/°C), and stable performance across –55°C to +125°C - making it suitable for field utility meters and automotive instrumentation where supply headroom and thermal robustness are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy (G = 5) | ±0.02% max - ensures <0.5 mV error in 2.5 V full-scale bridge outputs without calibration. |
| Input Offset Voltage | ±250 µV max - enables sub-10 µV resolution in RTD or thermocouple amplification with 10× gain. |
| CMRR (DC) | 94 dB - rejects >99.99% of 50/60 Hz line noise in industrial sensor front-ends. |
| Bandwidth (G = 25) | 2.0 MHz - supports direct interface to 1 MSPS ADCs like ADS7818 without external buffering. |
| Quiescent Current / Chan | 415 µA max - allows 10+ channels on a 5 V, 5 mA supply in portable data loggers. |
| Shutdown Current / Chan | 0.01 µA - extends battery life in intermittent-sampling applications such as smart meter wake cycles. |
| Operating Temp Range | –55°C to +125°C - qualified for under-hood automotive and outdoor industrial deployment. |
Pinout & Package
TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad optional, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | Shutdown A / Shutdown B | Active-low enable pins; pull below 0.8 V (at V+ = 5 V) to enter 0.01 µA sleep mode per channel. |
| 2, 13 | VOUTA / VOUTB | Rail-to-rail outputs; swing within 25 mV of rails at G ≥ 10 and RL ≥ 10 kΩ - directly drives SAR ADC reference inputs. |
| 3, 12 | REFA / REFB | Reference inputs defining zero-output level; require low-impedance source (<160 Ω) to maintain >80 dB CMRR. |
| 4, 11 | V+ | Positive supply rail; accepts 2.7 V to 5.5 V; decoupling with 0.1 µF capacitor required near pin for noise immunity. |
| 5, 10 | V– | Negative supply rail; tied to ground in single-supply configs; establishes common-mode baseline for input stage. |
| 6, 9 | VIN+A / VIN+B | Non-inverting inputs; 10¹³ Ω input impedance enables direct connection to high-Z sensors (e.g., piezoelectric transducers). |
| 7, 8 | VIN–A / VIN–B | Inverting inputs; matched with VIN+ pins for >90 dB CMRR up to 45 kHz - critical for differential line receivers. |
Key Features
| Feature | Design Value |
|---|---|
| Internally set G = 5 with external resistor scaling | Enables precise gain >5 V/V using only two matched resistors - avoids trimming errors in discrete IA designs. |
| Laser-trimmed input offset | ±250 µV max eliminates need for external nulling circuitry in ECG or strain-gauge signal chains. |
| Rail-to-rail output (G ≥ 10) | Delivers full dynamic range into 10 kΩ loads without level-shifting - simplifies interface to 3.3 V ADCs from 5 V supplies. |
| 0.5 pA input bias current | Prevents signal degradation when amplifying from megohm-level sources like pH electrodes or thermistors. |
| 114 dB crosstalk (dual channel) | Isolates Channel A and B signals in multi-sensor systems - essential for simultaneous ECG lead acquisition. |
Applications
| Industrial Sensor Amplifiers | Physiological Amplifiers |
|---|---|
|
Use Scenario: Amplifying millivolt-level differential output from a 350 Ω Wheatstone bridge in a load cell within a factory-floor weighing system. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing fixed G = 5 gain, rejecting common-mode noise from nearby VFDs and motors. Use Value: Delivers 2.5 V full-scale output with <0.02% gain error and 94 dB CMRR - eliminating need for post-amplifier digital correction. |
Use Scenario: Front-end amplification of ECG signals from limb leads in a portable fitness monitor with 5-day battery life. IC Role / Device Role / Timing Role: Dual-channel IA acquiring Lead I and Lead II simultaneously, with independent shutdown control per channel. Use Value: 415 µA/channel quiescent current and 0.01 µA shutdown current extend runtime; 114 dB crosstalk prevents inter-lead interference. |
| Differential Line Receivers with Gain | Field Utility Meters |
|
Use Scenario: Receiving isolated 4–20 mA loop signals over long cables in building automation, converting to 0–5 V for microcontroller ADC. IC Role / Device Role / Timing Role: High-CMRR differential receiver compensating for ground potential differences between field and control room. Use Value: 94 dB DC CMRR and 50 dB at 45 kHz suppress induced noise from HVAC systems and lighting ballasts. |
Use Scenario: Measuring voltage and current in a three-phase smart electricity meter operating continuously at 85°C ambient. IC Role / Device Role / Timing Role: Dual-channel sensor conditioner for voltage sensing (Phase A/B) and shunt-based current sensing (Phase C). Use Value: –55°C to +125°C rating and 600 µA max IQ over temperature ensure metrology-grade stability without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2128UA | Dual-channel, G = 5 fixed, but higher 1.2 mA IQ and no shutdown function; SOIC-16 package. | Not suitable for battery-powered designs requiring microamp shutdown; better for high-speed AC-coupled audio. | Select INA2128UA only if board space allows SOIC-16 and power budget permits 3× higher quiescent draw. |
| AD8226ARMZ | Single-channel, rail-to-rail output, 1.2 mA IQ, G = 5–1000 via single RG resistor; MSOP-8. | Lacks dual-channel integration and 114 dB crosstalk; requires two units for dual-sensor systems. | Choose AD8226ARMZ when single-channel density and lower cost outweigh need for integrated dual-channel timing alignment. |
Compared with INA2128UA and AD8226ARMZ, the INA2331AIPWT uniquely combines dual-channel operation, 0.01 µA shutdown, TSSOP-14 footprint, and guaranteed 94 dB CMRR over temperature - making it the only option for space-constrained, ultra-low-power, multi-sensor industrial metering.
Availability
INA2331AIPWT is available at Aetrix Electronics and suitable for industrial sensor amplifiers, physiological monitoring devices, differential line receivers with gain, and field utility meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for INA2331AIPWT 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 INA2331AIPWT belongs to TI's precision instrumentation amplifier product line, engineered specifically for low-power, wide-temperature industrial and medical sensor interfaces where accuracy, noise immunity, and supply flexibility are critical.
FAQ
What is the maximum gain achievable with the INA2331AIPWT?
The INA2331AIPWT has an internally set gain of 5 V/V and supports external gain programming up to 1000 V/V using the equation G = 5 + (5R₂/R₁). This is confirmed in the SBOS215C datasheet Electrical Characteristics table and Applications Information section. The INA2331AIPWT maintains specified performance - including bandwidth and CMRR - across this full gain range when external resistors are properly selected and layout parasitics minimized.
Does the INA2331AIPWT support true rail-to-rail input common-mode range?
No. The INA2331AIPWT supports rail-to-rail *output* swing (within 25 mV of rails at G ≥ 10), but its input common-mode range is limited: at VS = 5 V, it operates from 0.55 V to 3.8 V - i.e., 1.2 V below V+ and above V–. This is explicitly defined in the Electrical Characteristics table and Applications Information section of SBOS215C. Exceeding these bounds degrades CMRR and may cause saturation.
Can both channels of the INA2331AIPWT be independently shut down?
Yes. The INA2331AIPWT features separate shutdown pins: Pin 1 (Shutdown A) controls Channel A, and Pin 14 (Shutdown B) controls Channel B. Each pin is active-low and pulls quiescent current per channel down to 0.01 µA when driven below 0.8 V (at V+ = 5 V), as verified in the Absolute Maximum Ratings and Typical Characteristics sections of SBOS215C. This enables independent power gating in multi-sensor systems.
What is the thermal resistance (θJA) of the INA2331AIPWT in its TSSOP-14 package?
The thermal resistance θJA for the INA2331AIPWT in TSSOP-14 (PW) package is 150°C/W, as specified in the Electrical Characteristics table of SBOS215C. This value assumes standard JEDEC 2-layer board conditions (1 in² copper, 2 oz) and is critical for junction temperature estimation in high-ambient environments like enclosed utility meters or automotive ECUs.
Is the INA2331AIPWT RoHS-compliant and lead-free?
Yes. The INA2331AIPWT is RoHS-compliant and uses NiPdAu (NIPDAU) lead finish, as confirmed in the Package Option Addendum of SBOS215C. It carries MSL Level-2-260°C-1 Year rating and is qualified for lead-free reflow soldering per JEDEC J-STD-020. All active orderable variants (including INA2331AIPWT) meet current RoHS Directive 2011/65/EU requirements.
INA2331AIPWT 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
INA2331AIPWT FAQ
1.How can I place an order for INA2331AIPWT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2331AIPWT 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 INA2331AIPWT reliable?
The price and inventory of INA2331AIPWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2331AIPWT is usually 5 days.
3.What payment methods are accepted for INA2331AIPWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2331AIPWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2331AIPWT?
INA2331AIPWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2331AIPWT 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 INA2331AIPWT?
For technical support, including INA2331AIPWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2331AIPWT requirements.
6.How does Aetrix verify that INA2331AIPWT is sourced from the original manufacturer or authorized distributors?
All INA2331AIPWT 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 INA2331AIPWT meets industry standards.
7.What is the process for return or replacement of INA2331AIPWT?
All INA2331AIPWT units undergo pre-shipment inspection (PSI). If there is an issue with INA2331AIPWT, 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 INA2331AIPWT part is unused and in its original packaging.
Return procedure for INA2331AIPWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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