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Texas Instruments INA326EA/2K5G4
- Part No.:
- INA326EA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA326EA/2K5G4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,300
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Product details
Overview
INA326EA/2K5G4 from Texas Instruments is a precision rail-to-rail input/output instrumentation amplifier in MSOP-8 package, featuring 100 µV max offset voltage, 0.4 µV/°C max drift, and 1 kHz bandwidth at G = 100. It operates from +2.7 V to +5.5 V single supply and delivers true rail-to-rail common-mode input range (20 mV below V− to 100 mV above V+), making it ideal for low-level bridge and thermocouple signal conditioning in industrial weigh scales and multi-channel data acquisition systems.
For engineers reviewing the INA326EA/2K5G4 datasheet, INA326EA/2K5G4 pinout, INA326EA/2K5G4 application, or INA326EA/2K5G4 equivalent, key selection considerations include its auto-correction architecture eliminating 1/f noise at G ≥ 100, output filter flexibility (1 kHz or 10 kHz corner), high CMR (>114 dB at DC), and verified performance over –40°C to +85°C with operation up to +125°C.
Technical Context
The INA326EA/2K5G4 employs a unique current-mode topology: differential input voltage develops current across external R1, which is mirrored and doubled into R2 to set gain (G = 2×R2/R1). Internal charge-pump supplies enable true rail-to-rail input operation beyond supply rails, decoupling CMR from resistor matching.
Its dynamic behavior is filter-limited-bandwidth remains stable across gains due to integrated auto-correction circuitry operating at 90 kHz ±20%, with output ripple spectrum showing dominant spurs at 90 kHz harmonics. Settling time (0.1% at 1 kHz filter, G = 100) is 0.95 ms, and overload recovery is 30 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage (max) | ±100 µV - ensures ≤0.1% error in 100 mV full-scale sensor outputs without trimming |
| Offset Drift (max) | ±0.4 µV/°C - guarantees <1 µV total drift over 0–70°C industrial range |
| Input Common-Mode Range | (V−) −20 mV to (V+) +100 mV - enables direct connection to shunt resistors biased near supply rails |
| Output Swing (RL = 10 kΩ) | Within 10 mV of rails - supports full-scale ADC utilization with 5 V supply |
| Gain Bandwidth Product | 1 kHz at G = 100 (filter-limited) - provides stable, predictable settling for precision DC/low-freq measurements |
| Supply Current | 2.4–3.4 mA - compatible with battery-powered portable instrumentation with minimal thermal load |
| CMR (DC) | 114 dB (typ) - rejects >3.5 MV/V common-mode interference in noisy industrial environments |
Pinout & Package
INA326EA/2K5G4 is housed in an MSOP-8 (DGK) package, 3.0 mm × 3.0 mm × 1.0 mm, with exposed thermal pad (not electrically connected). Pin 1 is marked by dot; pin numbering follows standard MSOP convention (counterclockwise from mark).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN− | Inverting input terminal; requires bias current return path (≥10¹⁰ Ω impedance compatible) |
| 2 | VIN+ | Non-inverting input terminal; same bias current requirement as Pin 1 |
| 3 | V− | Negative supply rail (GND for single-supply); internal charge pumps extend input range below this node |
| 4 | V+ | Positive supply rail (+2.7 V to +5.5 V); bypass capacitor (0.1 µF) required between Pins 4 and 7 |
| 5 | IACOMMON | Output reference node; voltage at this pin defines VO = G × (VIN+ − VIN−) + VIACOMMON |
| 6 | VO | Filtered output; connects to ROCO low-pass filter (e.g., 100 Ω + 1 µF for 1 kHz corner) |
| 7 | V+ | Positive supply rail (duplicate connection for low-inductance bypassing) |
| 8 | V− | Negative supply rail (duplicate connection for low-inductance bypassing) |
Key Features
| Feature | Design Value |
|---|---|
| Auto-correction architecture | Eliminates 1/f noise at gains ≥100, reducing 0.01–10 Hz input-referred noise to 0.8 µVp-p |
| Rail-to-rail input range | Operates linearly 20 mV below V− and 100 mV above V+, enabling direct high-side shunt monitoring |
| Filter-flexible output | ROCO network sets both noise floor and bandwidth; 1 kHz filter yields 0.95 ms 0.1% settling |
| High CMR independent of layout | Current-mode topology rejects common-mode errors from reference trace resistance or socket contact |
| Low quiescent current | 2.4 mA typical at +5 V allows integration into power-constrained portable test equipment |
Applications
| Bridge Sensor Amplification | Multi-Channel Data Acquisition |
|---|---|
|
Use Scenario: Amplifying mV-level outputs from Wheatstone bridge strain gauges in industrial load cells under vibration and temperature cycling. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing fixed-gain (G = 100–1000), low-drift signal conditioning before 16-bit SAR ADC sampling. Use Value: 0.4 µV/°C drift and 100 µV max offset ensure ≤0.05% measurement error over –20°C to +70°C ambient without calibration. |
Use Scenario: Simultaneous analog front-end for 8-channel medical ECG system requiring isolated, low-noise biopotential amplification. IC Role / Device Role / Timing Role: Channelized signal conditioner with externally set gain and 1 kHz filter to anti-alias and suppress 50/60 Hz interference. Use Value: 114 dB CMR and 33 nV/√Hz broadband noise enable >90 dB SNR at 1 kHz with 100 µV p-p input signals. |
| Weigh Scale Signal Chain | High-Side Current Monitoring |
|
Use Scenario: Analog signal path in commercial retail weighing scale using 350 Ω load cell with ±5 V excitation and 20-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Primary gain stage with programmable offset (via IACOMMON) to center output within ADC's 0–5 V range. Use Value: Output swing within 10 mV of rails ensures full 20-bit dynamic range utilization; long-term stability avoids recalibration every 6 months. |
Use Scenario: Monitoring battery pack charging current in 48 V telecom power system with ±50 mV shunt drop and microcontroller ADC interface. IC Role / Device Role / Timing Role: High-common-mode-voltage amplifier referenced to shunt's high side, rejecting 48 V common-mode while resolving 10 mA steps. Use Value: Input range extending 100 mV above V+ allows direct connection to shunt without level-shifting; 1 kHz bandwidth suffices for slow-charging control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA337EA/2K5 | Specified over –40°C to +125°C; identical offset (100 µV max) and drift (0.4 µV/°C max), but adds shutdown pin (MSOP-10) | Required for extended-temperature automotive or downhole sensing where +125°C operation is mandatory | Select INA337EA/2K5 only if full –40°C to +125°C specification compliance is required; otherwise INA326EA/2K5 offers lower cost and smaller footprint |
| INA128UA/2K5 | Higher offset (50 µV typ), higher drift (0.5 µV/°C max), no rail-to-rail input (limited to V− + 1.5 V to V+ − 1.5 V), but higher CMR (125 dB) | Suitable for mid-accuracy industrial sensors where rail-to-rail input is unnecessary and higher CMR justifies trade-offs | Choose INA128UA/2K5 when legacy designs require pin-compatible upgrade with better CMR but can tolerate reduced input range and higher drift |
Compared with INA326EA/2K5, INA337EA/2K5 extends temperature coverage without sacrificing precision, while INA128UA/2K5 trades rail-to-rail input and ultra-low drift for higher CMR and broader industry acceptance-making INA326EA/2K5 optimal for new designs prioritizing input flexibility and long-term stability in 0–70°C environments.
Availability
INA326EA/2K5G4 is available at Aetrix Electronics and suitable for industrial weigh scales, medical instrumentation, and multi-channel data acquisition systems requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for INA326EA/2K5G4 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 INA326EA/2K5G4 belongs to TI's precision instrumentation amplifier product line, engineered specifically for low-drift, low-noise DC-coupled measurement of microvolt-level transducer signals in harsh industrial and medical environments.
FAQ
What is the maximum recommended gain-setting resistor value for INA326EA/2K5G4 to maintain specified offset performance?
The INA326EA/2K5G4 datasheet specifies offset and drift performance at R1 = 2 kΩ and R2 = 100 kΩ. While R2 may be increased to achieve higher gains (e.g., 10 MΩ for G = 10,000), doing so raises input-referred offset per VOS = 10 µV + (50 nA)(R2)/G. For G = 100, R2 > 200 kΩ increases offset beyond 100 µV max. Thus, 100 kΩ is the maximum R2 recommended to guarantee datasheet limits for INA326EA/2K5G4.
Does INA326EA/2K5G4 require external capacitors for stable operation, and if so, what values are validated?
Yes, INA326EA/2K5G4 requires two external capacitors: a 0.1 µF ceramic capacitor placed directly between Pins 4 (V+) and 7 (V+), and an RC filter (RO + CO) from Pin 6 (VO) to Pin 5 (IACOMMON). TI validates RO = 100 Ω and CO = 1 µF for 1 kHz –3 dB corner, yielding 0.95 ms 0.1% settling. C2 (across R2) is also required-e.g., 0.5 nF for G = 100-to form the second pole and minimize auto-correction ripple.
Can INA326EA/2K5G4 be used with dual supplies, and how does that affect its input common-mode range?
Yes, INA326EA/2K5G4 operates with dual supplies (e.g., ±2.5 V), and its input common-mode range remains unchanged: (V−) −20 mV to (V+) +100 mV. With ±2.5 V supplies, this translates to –2.52 V to +2.6 V-enabling measurement of signals centered at ground while retaining 20 mV headroom below negative rail. Dual-supply operation also simplifies biasing for AC-coupled sensors and improves PSR at low frequencies.
How does the IACOMMON pin function in INA326EA/2K5G4, and what happens if it's left unconnected?
The IACOMMON pin (Pin 5) defines the reference point for the output voltage: VO = G × (VIN+ − VIN−) + VIACOMMON. It must be connected-typically to ground, V+/2, or a precision reference-to establish output DC level. If left unconnected, the pin floats, causing unpredictable output offset, saturation, or oscillation due to leakage currents. TI explicitly warns against open-circuit IACOMMON in the SBOS222D datasheet for INA326EA/2K5G4.
Is INA326EA/2K5G4 susceptible to electromagnetic interference from its internal 90 kHz auto-correction clock, and how is it mitigated?
Yes, INA326EA/2K5G4 generates spurious energy at ~90 kHz and harmonics, visible in the output ripple spectrum. This is mitigated by the recommended ROCO low-pass filter: a 1 kHz corner suppresses >99% of 90 kHz content. Layout best practices-short traces to Pins 1 and 8, ground plane under MSOP-8, and shielding sensitive analog nodes-further reduce coupling. The 10 kHz filter option trades bandwidth for additional 20 dB suppression at 90 kHz.
INA326EA/2K5G4 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:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 kHz
- Current - Input Bias:
- 200 pA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 2.4mA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
INA326EA/2K5G4 FAQ
1.How can I place an order for INA326EA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA326EA/2K5G4 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 INA326EA/2K5G4 reliable?
The price and inventory of INA326EA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA326EA/2K5G4 is usually 5 days.
3.What payment methods are accepted for INA326EA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA326EA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA326EA/2K5G4?
INA326EA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA326EA/2K5G4 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 INA326EA/2K5G4?
For technical support, including INA326EA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA326EA/2K5G4 requirements.
6.How does Aetrix verify that INA326EA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All INA326EA/2K5G4 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 INA326EA/2K5G4 meets industry standards.
7.What is the process for return or replacement of INA326EA/2K5G4?
All INA326EA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA326EA/2K5G4, 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 INA326EA/2K5G4 part is unused and in its original packaging.
Return procedure for INA326EA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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