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Texas Instruments INA327EA/250G4
- Part No.:
- INA327EA/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA327EA/250G4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,956
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Product details
Overview
INA327EA/250G4 from Texas Instruments is a precision rail-to-rail input/output instrumentation amplifier with integrated shutdown control, designed for low-drift, low-noise sensor signal conditioning in single-supply systems. It delivers 100 µV max input offset voltage, 0.4 µV/°C max offset drift, and operates from +2.7 V to +5.5 V over –40°C to +85°C. Its MSOP-10 package supports high-density PCB layouts in weigh scales and medical instrumentation.
For engineers reviewing the INA327EA/250G4 datasheet, INA327EA/250G4 pinout, INA327EA/250G4 application, or INA327EA/250G4 equivalent, key selection criteria include shutdown current (≤5 µA), enable logic thresholds (0.25 V low / 1.6 V high), rail-to-rail input range (20 mV below V− to 100 mV above V+), and 1 kHz filter–limited bandwidth at G = 100.
Technical Context
The INA327EA/250G4 implements a unique current-mode topology that converts differential input voltage into proportional current through R1, enabling true rail-to-rail input operation without matched resistor networks. Its internal charge-pump supplies power A1/A2 stages beyond the rails, allowing output swing within 10 mV of supply rails and linear input operation beyond both rails.
It integrates an auto-correction circuit operating at 90 kHz ±20% to suppress 1/f noise-especially effective at gains ≥100-while requiring external R2/C2 and RO/CO filters to manage high-frequency ripple. The Enable pin controls power state with 75 µs enable time and 100 µs disable time, placing output in high-impedance state when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage (max) | ±100 µV - ensures ≤0.1% gain error at G = 1000 for 100 mV input signals |
| Offset Drift (max) | ±0.4 µV/°C - guarantees <1 µV total drift over 0°C–70°C industrial range |
| Supply Range | +2.7 V to +5.5 V - enables direct interface with 3.3 V and 5 V microcontrollers without level shifting |
| Shutdown Current | 2–5 µA - reduces average system current by >99% in battery-powered data loggers |
| Common-Mode Rejection | 94 dB (min, over temp) - rejects >99.9% of 1 V common-mode interference at DC |
| Gain Bandwidth Product | 1 kHz (filter-limited, G = 100) - sets minimum anti-aliasing filter corner for 10 kSPS ADC sampling |
| Input Common-Mode Range | (V−) − 20 mV to (V+) + 100 mV - supports direct connection to bridge sensors biased near ground or rail |
Pinout & Package
INA327EA/250G4 is housed in a 10-pin MSOP (DGS) package with 0.5 mm pitch, 3.0 mm × 3.0 mm footprint, and 1.0 mm height-optimized for space-constrained industrial sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN−) | Inverting Input | Accepts differential input signals down to 20 mV below V−; requires bias current return path (≥10¹⁰ Ω impedance) |
| 2 (VIN+) | Non-inverting Input | Accepts differential input signals up to 100 mV above V+; same bias current requirement as Pin 1 |
| 3 (V−) | Negative Supply | Ground reference for single-supply operation; connects to system GND or negative rail in dual-supply configs |
| 4 (V+) | Positive Supply | +2.7 V to +5.5 V input; requires 0.1 µF ceramic bypass capacitor placed adjacent to pin |
| 5 (IACOMMON) | Output Reference Terminal | Defines output voltage reference point; must be connected to V+ for proper operation per datasheet Figure 11 |
| 6 (VO) | Filtered Output | Low-impedance buffered output; includes internal auto-correction ripple filtered by external RO/CO network |
| 7 (R1) | Gain-Setting Resistor Terminal | Connects to one end of R1; sets first-stage gain; R1 ≥ 2 kΩ required for stability and low noise |
| 8 (R2) | Gain-Setting Resistor Terminal | Connects to R2 and C2; defines overall gain G = 2(R2/R1); R2 value impacts offset drift per Eq. 4 |
| 9 (Enable) | Shutdown Control Input | CMOS-compatible logic input; <0.25 V disables (2–5 µA IQ), >1.6 V enables (2.4–3.7 mA IQ) |
| 10 (NC) | No Connection | Internally unconnected; must remain floating-no external tie or pull-up/down |
Key Features
| Feature | Design Value |
|---|---|
| True Rail-to-Rail Input | Operates linearly with inputs 20 mV below V− and 100 mV above V+, eliminating need for level-shifting in bridge/thermocouple front-ends |
| Auto-Correction Noise Reduction | 90 kHz internal oscillator cancels 1/f noise at gains ≥100, reducing 0.01 Hz–10 Hz input-referred noise to 0.8 µVP-P |
| Shutdown-Controlled Power Gating | Reduces quiescent current from 3.4 mA to 5 µA, enabling µA-level average current in duty-cycled sensor nodes |
| High CMR Without Matched Resistors | Current-mode architecture achieves 114 dB typical CMR at 25°C independent of external resistor tolerance or layout parasitics |
| Output Filter Integration Support | Dedicated IACOMMON and VO pins simplify implementation of 2-pole RO/CO + R2/C2 filtering for optimized noise-bandwidth trade-off |
Applications
| Bridge Sensor Amplification | Medical ECG Signal Conditioning |
|---|---|
Use Scenario: Amplifying mV-level outputs from full-bridge load cells in industrial weighing systems with ±5 V excitation. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing programmable gain (G = 10–1000), rail-to-rail input to capture full bridge swing, and shutdown during idle cycles. Use Value: 100 µV offset and 0.4 µV/°C drift ensure ≤0.02% measurement error across temperature; MSOP-10 footprint saves board space in multi-channel scale controllers. |
Use Scenario: Conditioning low-amplitude, high-impedance biopotential signals from dry-electrode ECG leads in portable monitors. IC Role / Device Role / Timing Role: Front-end IA rejecting 50/60 Hz mains interference while preserving sub-µV ST-segment details; enabled only during active acquisition windows. Use Value: 94 dB min CMR over temperature rejects common-mode noise; 0.8 µVP-P 0.01–10 Hz noise enables detection of 2 µV QRS complexes without amplification-induced distortion. |
| Multi-Channel Data Acquisition | Battery-Powered Test Equipment |
Use Scenario: Simultaneous analog input conditioning for 8-channel DAQ systems measuring thermocouples, RTDs, and strain gauges. IC Role / Device Role / Timing Role: Channel-isolated IA with independent enable control per channel, synchronized to ADC sampling clock to minimize cross-talk. Use Value: 75 µs enable time allows precise timing alignment with 10 kSPS conversions; shutdown current <5 µA prevents thermal drift in unselected channels. |
Use Scenario: Portable handheld multimeter front-end amplifying µA–mA shunt voltages with autoranging and low-power sleep mode. IC Role / Device Role / Timing Role: Programmable-gain IA driving SAR ADC, entering shutdown between measurements to extend 2xAA battery life to >1 year. Use Value: Single +3.3 V supply operation eliminates need for charge pumps; 10 mV rail-to-rail output swing maximizes dynamic range into 12-bit ADC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA337AIDGSR | Same rail-to-rail I/O, but specified over –40°C to +125°C; 0.4 µV/°C drift matches INA327EA/250G4; MSOP-10 pinout identical | Required for automotive under-hood or industrial motor-control environments exceeding +85°C ambient | Select when extended temperature operation is mandatory; no PCB change needed |
| INA128UA/2K5 | Higher 50 µV max offset and 0.5 µV/°C drift; 125 dB CMR vs 114 dB typical; 750 µA IQ vs 3.4 mA; SO-8 vs MSOP-10 | Suitable for lower-accuracy, lower-power applications where 12-bit resolution suffices and board space permits SOIC | Choose for cost-sensitive designs needing <1 mW per channel; requires layout revision due to package and pinout mismatch |
Compared with INA327EA/250G4, INA337AIDGSR offers identical performance in a wider temperature grade, while INA128UA/2K5 trades precision and speed for ultra-low power and legacy SOIC compatibility-making the INA327EA/250G4 optimal for space-constrained, high-accuracy 3.3 V/5 V industrial sensor nodes.
Availability
INA327EA/250G4 is available at Aetrix Electronics and suitable for weigh scales, medical instrumentation, multi-channel data acquisition systems, and portable test equipment requiring stable component supply and guaranteed long-term manufacturability.
Supply support for INA327EA/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 INA327EA/250G4 belongs to TI's precision instrumentation amplifier product line, engineered specifically for high-accuracy, low-drift sensor interfacing in single-supply industrial and medical systems.
FAQ
What is the absolute maximum supply voltage for the INA327EA/250G4?
The absolute maximum supply voltage for the INA327EA/250G4 is +5.5 V. Exceeding this rating-even momentarily-may cause permanent damage. Operation is specified from +2.7 V to +5.5 V, with optimal performance observed at +5 V. The device includes internal diode clamping on input terminals, but supply rails themselves must not exceed +5.5 V to avoid junction breakdown.
How does the Enable pin function on the INA327EA/250G4?
The Enable pin (Pin 9) of the INA327EA/250G4 is a CMOS-compatible digital control input. A logic HIGH (>1.6 V) enables normal operation with 2.4–3.7 mA quiescent current; a logic LOW (<0.25 V) places the device in shutdown mode, reducing supply current to 2–5 µA. The output enters high-impedance state during shutdown. Leaving this pin floating is prohibited-it must be actively driven or tied to V+ or V−.
Can the INA327EA/250G4 operate with input signals beyond the supply rails?
Yes-the INA327EA/250G4 supports true rail-to-rail input operation: its linear input common-mode range extends 20 mV below V− and 100 mV above V+. This allows direct connection to transducers whose outputs swing slightly beyond the rails, such as grounded-load current-sense configurations. However, absolute input voltage must remain within (V−) − 0.5 V to (V+) + 0.5 V to avoid forward-biasing internal clamp diodes.
What external components are required for stable operation of the INA327EA/250G4?
Stable operation of the INA327EA/250G4 requires: (1) a 0.1 µF ceramic capacitor between V+ (Pin 4) and V− (Pin 3), placed as close as possible to the pins; (2) external gain-setting resistors R1 and R2 (R1 ≥ 2 kΩ); and (3) optional RO/CO and R2/C2 filter networks to suppress auto-correction ripple. No compensation capacitors are needed on the amplifier itself-stability is inherent to the current-mode architecture.
Is the INA327EA/250G4 pin-compatible with the INA326EA/250?
No-the INA327EA/250G4 is not pin-compatible with the INA326EA/250. While both share functional similarity, the INA327EA/250G4 uses an MSOP-10 package with dedicated Enable (Pin 9) and IACOMMON (Pin 5) pins, whereas the INA326EA/250 uses an MSOP-8 package with no shutdown functionality. Direct replacement would require PCB redesign, new footprint, and updated routing for the two additional pins and altered pin assignments.
INA327EA/250G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-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:
- 10-VSSOP
INA327EA/250G4 FAQ
1.How can I place an order for INA327EA/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA327EA/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 INA327EA/250G4 reliable?
The price and inventory of INA327EA/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA327EA/250G4 is usually 5 days.
3.What payment methods are accepted for INA327EA/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA327EA/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA327EA/250G4?
INA327EA/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA327EA/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 INA327EA/250G4?
For technical support, including INA327EA/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA327EA/250G4 requirements.
6.How does Aetrix verify that INA327EA/250G4 is sourced from the original manufacturer or authorized distributors?
All INA327EA/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 INA327EA/250G4 meets industry standards.
7.What is the process for return or replacement of INA327EA/250G4?
All INA327EA/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA327EA/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 INA327EA/250G4 part is unused and in its original packaging.
Return procedure for INA327EA/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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