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Texas Instruments INA326EA/250G4
- Part No.:
- INA326EA/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA326EA/250G4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,837
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Product details
Overview
INA326EA/250G4 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 ±100 mV beyond rails input common-mode range - ideal for low-level bridge and thermocouple signal conditioning in industrial weigh scales and multi-channel data acquisition systems.
For engineers reviewing the INA326EA/250G4 datasheet, INA326EA/250G4 pinout, INA326EA/250G4 application, or INA326EA/250G4 equivalent, key selection criteria include its true rail-to-rail I/O capability, ultra-low 1/f noise performance, guaranteed industrial temperature operation (–40°C to +85°C), and external gain-setting architecture requiring only two resistors with G = 2(R₂/R₁).
Technical Context
The INA326EA/250G4 uses a unique current-mode topology with internal charge-pump supplies enabling true rail-to-rail input operation - linear down to 20 mV below V⁻ and up to 100 mV above V⁺ - unlike conventional resistor-ratio-based instrumentation amplifiers. Its auto-correction circuitry eliminates 1/f noise at gains ≥100, with output ripple centered at 90 kHz.
Gain is set externally via R₁ and R₂ (G = 2R₂/R₁); stability and drift depend on resistor TCR and layout. The device features an IACOMMON reference terminal (Pin 5) that defines output voltage reference, and requires RO/CO filtering to suppress auto-correction noise - filter corner directly trades off noise vs. bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage (max) | ±100 µV over –40°C to +85°C - ensures ≤0.1% error in 100 mV full-scale sensor outputs without trimming. |
| Offset Drift (max) | ±0.4 µV/°C - enables stable DC accuracy in unregulated industrial environments across temperature swings. |
| Input Common-Mode Range | (V⁻) – 20 mV to (V⁺) + 100 mV - supports direct connection to shunt resistors and transducers operating near supply rails. |
| Output Swing | Within 10 mV of rails (RL = 100 kΩ) - maximizes dynamic range for ADCs with 0–VCC input ranges. |
| Supply Voltage | +2.7 V to +5.5 V single supply - compatible with Li-ion, USB, and 3.3 V/5 V embedded systems without dual supplies. |
| Bandwidth (G = 100) | 1 kHz (with 1 kHz filter) - optimized for low-frequency sensor signals like load cells and RTDs. |
| Quiescent Current | 2.4–3.4 mA - balances precision and power in always-on measurement nodes. |
Pinout & Package
INA326EA/250G4 is housed in an 8-pin MSOP (DGK) package with 0.65 mm pitch, 3.0 mm × 3.0 mm footprint, and exposed thermal pad (not electrically connected). Pin 1 is marked by a dot or beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN− | Inverting input - forms differential pair with VIN+; requires matched bias path for stable operation. |
| 2 | VIN+ | Non-inverting input - high-impedance (10¹⁰ Ω || 14 pF); must provide return path for ±0.2 nA bias current. |
| 3 | V− | Negative supply - connects to ground or negative rail; bypass with 0.1 µF capacitor adjacent to pin. |
| 4 | V+ | Positive supply - connects to +2.7 V to +5.5 V; bypass with 0.1 µF capacitor between Pins 4 and 7. |
| 5 | IACOMMON | Output reference node - output voltage is referenced to this pin; ties to low-side of R₂ in gain network. |
| 6 | VO | Filtered output - buffered voltage referenced to IACOMMON; includes internal auto-correction ripple. |
| 7 | V+ | Positive supply (duplicate connection) - tied internally to Pin 4; used for supply decoupling. |
| 8 | VIN− | Non-inverting input (duplicate label) - same as Pin 2; both pins are electrically identical per TI SBOS222D. |
Key Features
| Feature | Design Value |
|---|---|
| True rail-to-rail input | Operates linearly 20 mV below V⁻ and 100 mV above V⁺ - eliminates level-shifting circuits for shunt monitors. |
| Auto-correction noise reduction | Eliminates 1/f noise at G ≥ 100; residual broadband noise is 33 nV/√Hz - critical for µV-level thermocouple resolution. |
| Current-mode topology | Rejects CMR errors from resistor mismatch and socket/contact resistance - no external laser-trimmed resistors needed. |
| External gain setting | G = 2(R₂/R₁) with R₁ ≥ 2 kΩ - enables flexible, temperature-stable gain tuning using standard thin-film resistors. |
| Output filter interface | RO/CO and R₂/C₂ form configurable 2-pole filter - allows optimization of noise vs. settling time (e.g., 0.95 ms to 0.1%). |
Applications
| Bridge Sensor Amplification | High-Resolution Data Acquisition |
|---|---|
Use Scenario: Amplifying mV-level differential output from Wheatstone bridge pressure sensors in HVAC controllers. IC Role / Device Role / Timing Role: Precision instrumentation amplifier with rail-to-rail I/O and low drift - conditions signal before 24-bit sigma-delta ADC. Use Value: 100 µV offset and 0.4 µV/°C drift ensure <0.02% FS error over –25°C to +70°C ambient without calibration. |
Use Scenario: Multi-channel front-end for portable test equipment measuring thermocouples, RTDs, and strain gauges. IC Role / Device Role / Timing Role: Channel-isolated gain stage with programmable external resistors - enables unified hardware for multiple sensor types. Use Value: External R₁/R₂ configuration allows software-selectable gains (10–1000) without changing BOM or layout. |
| Weigh Scale Signal Chain | Medical Instrumentation |
Use Scenario: Load cell interface in Class III legal-for-trade bench scales with 10,000:1 resolution. IC Role / Device Role / Timing Role: Primary gain block with 1 kHz bandwidth and ultra-low 1/f noise - preserves low-frequency weight stability. Use Value: 0.8 µVP-P (0.01–10 Hz) noise floor enables sub-gram resolution on 10 kg platforms. |
Use Scenario: Biopotential signal conditioning in ECG/EMG modules where electrode offsets vary widely. IC Role / Device Role / Timing Role: Input-stage IA with extended common-mode range - handles ±300 mV electrode DC offsets while rejecting 50/60 Hz interference. Use Value: (V⁻) – 20 mV to (V⁺) + 100 mV input range accepts unbalanced electrode potentials without clamping or saturation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA337EA/250 | Same MSOP-8 package; specified over –40°C to +125°C; 0.4 µV/°C drift (same), but 250 µV max offset (vs. 100 µV). | Targeted at automotive under-hood use; higher temp range but looser initial offset spec. | Select when extended temperature operation is mandatory and system calibration compensates for higher VOS. |
| INA128UA/2K5 | SO-8 package; 50 µV max offset, 125 dB CMR, 750 µA IQ - lower power but no rail-to-rail input (CM range = V⁻ + 1.5 V to V⁺ – 1.5 V). | Suited for mid-accuracy industrial PLC analog inputs where supply headroom permits. | Choose when ultra-low quiescent current matters more than rail-to-rail input and board space allows SO-8. |
Compared with INA326EA/250G4, INA337EA/250 offers wider temperature coverage at the cost of initial offset accuracy, while INA128UA/2K5 reduces power by 75% but sacrifices input range and requires ≥1.5 V headroom - making INA326EA/250G4 optimal for compact, rail-referenced, high-precision sensor interfaces.
Availability
INA326EA/250G4 is available at Aetrix Electronics and suitable for industrial weigh scales, medical biopotential monitoring, and multi-channel data acquisition systems requiring stable component supply with guaranteed long-term availability and traceable lot history.
Supply support for INA326EA/250G4 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 INA326 belongs to TI's precision instrumentation amplifier product line, designed specifically for low-drift, low-noise amplification of microvolt-level sensor outputs in harsh industrial and medical environments.
FAQ
What is the maximum recommended gain for stable operation of the INA326EA/250G4?
The INA326EA/250G4 supports gains from <0.1 to >10,000 V/V per datasheet SBOS222D. However, stability and noise performance are optimized for gains ≥10 with proper RO/CO filtering. At G = 100, the device achieves 1 kHz bandwidth and minimal 1/f noise; gains >1000 require careful attention to R₂/C₂ values to avoid peaking and maintain 0.1% settling within 160 µs.
Does the INA326EA/250G4 require external capacitors for basic operation?
Yes - the INA326EA/250G4 requires a 0.1 µF ceramic capacitor placed directly between Pins 4 (V+) and 7 (V+) for supply decoupling. Additionally, RO/CO and R₂/C₂ form essential output and gain-filter networks; omitting them results in 90 kHz auto-correction ripple and degraded noise performance. TI Figure 1 specifies 100 Ω / 1 µF for RO/CO and 200 kΩ / 0.5 nF for R₂/C₂ at G = 100.
Can the INA326EA/250G4 operate from a 3.3 V supply?
Yes - the INA326EA/250G4 is fully specified from +2.7 V to +5.5 V single supply. At +3.3 V, it maintains rail-to-rail input (down to –20 mV below GND and up to +3.4 V), 10 mV output swing margin, and 2.4–3.4 mA quiescent current. Gain accuracy and bandwidth remain consistent; however, output headroom shrinks, so VO filter design must ensure signal stays within 0–3.3 V range.
How does the IACOMMON pin (Pin 5) function in the INA326EA/250G4?
The IACOMMON pin (Pin 5) serves as the output voltage reference node - the VO pin voltage is measured relative to IACOMMON, not ground. In standard configurations, IACOMMON connects to the low-side of R₂, establishing a virtual reference that enables output swing beyond the supply rails. This architecture allows precise offset adjustment (e.g., adding 100 mV DC bias) and simplifies level-shifting in single-supply systems.
Is the INA326EA/250G4 pin-compatible with the INA327 series?
No - the INA326EA/250G4 (MSOP-8) is not pin-compatible with the INA327 (MSOP-10). The INA327 adds an Enable pin (Pin 5) and relocates V−, V+, and IACOMMON to different positions. Attempting to substitute either device without PCB revision will result in incorrect connections, including floating enable logic and misrouted supply pins. TI explicitly states separate pin configurations in SBOS222D Figure 1 and Figure 2.
INA326EA/250G4 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/250G4 FAQ
1.How can I place an order for INA326EA/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA326EA/250G4 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/250G4 reliable?
The price and inventory of INA326EA/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA326EA/250G4 is usually 5 days.
3.What payment methods are accepted for INA326EA/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA326EA/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA326EA/250G4?
INA326EA/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA326EA/250G4 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/250G4?
For technical support, including INA326EA/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA326EA/250G4 requirements.
6.How does Aetrix verify that INA326EA/250G4 is sourced from the original manufacturer or authorized distributors?
All INA326EA/250G4 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/250G4 meets industry standards.
7.What is the process for return or replacement of INA326EA/250G4?
All INA326EA/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA326EA/250G4, 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/250G4 part is unused and in its original packaging.
Return procedure for INA326EA/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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