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Texas Instruments INA327EA/250
- Part No.:
- INA327EA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA327EA/250.pdf
- Description:
- IC INST AMP 1 CIRCUIT 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:442
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Product details
Overview
INA327EA/250 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 offset voltage, 0.4 µV/°C max drift, and operates from +2.7 V to +5.5 V over –40°C to +85°C - enabling high-accuracy bridge, load cell, and thermocouple amplification in industrial weighing and medical instrumentation.
For engineers reviewing the INA327EA/250 datasheet, INA327EA/250 pinout, INA327EA/250 application, or INA327EA/250 equivalent, this page provides verified technical context, MSOP-10 package mapping, real-world use-value analysis for transducer interfaces, and validated alternative options for multi-channel data acquisition and battery-powered sensor nodes.
Technical Context
The INA327EA/250 implements a unique current-mode topology that converts differential input voltage into proportional current across R1, eliminating dependence on resistor matching for common-mode rejection. Its internal charge-pump supplies enable true rail-to-rail input operation - linear down to 20 mV below V− and up to 100 mV above V+ - unlike conventional three-op-amp architectures.
It integrates an auto-correction circuit operating at 90 kHz ±20% to suppress 1/f noise, especially effective at gains ≥100. The Enable pin (Pin 5) controls shutdown, reducing quiescent current from 3.4 mA to 5 µA typical while placing the output in high-impedance state - critical for time-multiplexed analog buses and ultra-low-power portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage (max) | 100 µV - ensures ≤0.1% error in 100 mV full-scale bridge outputs without trimming |
| Offset Drift (max) | 0.4 µV/°C - supports stable 16-bit-equivalent resolution over industrial temperature range |
| Input Common-Mode Range | (V−) −20 mV to (V+) +100 mV - enables direct connection to shunt-based current sensors referenced to negative rails |
| Output Swing (RL = 10 kΩ) | Within 10 mV of rails - preserves dynamic range in 3.3 V or 5 V ADC front-ends |
| Supply Voltage Range | +2.7 V to +5.5 V - compatible with Li-ion, USB, and regulated 3.3 V/5 V system rails |
| Shutdown Current (typ) | 2 µA - extends battery life in intermittent-sampling sensor nodes by >1000× vs active mode |
| Gain Equation | G = 2(R₂/R₁) - external resistor ratio sets precise, temperature-stable gain without internal trimming |
Pinout & Package
INA327EA/250 is housed in a 10-pin MSOP (DGS) package with 0.5 mm pitch, optimized for compact PCB layouts and thermal performance (θJA = 150°C/W). Pin 5 must be connected to V+ for proper enable functionality.
| 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+; matched input impedance to Pin 1 |
| 3 (V−) | Negative supply | Ground or negative rail reference; input common-mode extends 20 mV below this pin |
| 4 (V+) | Positive supply | +2.7 V to +5.5 V supply; input common-mode extends 100 mV above this pin |
| 5 (Enable) | Shutdown control | Logic high (>1.6 V) enables amplifier; logic low (<0.25 V) disables output and reduces IQ to ~2 µA |
| 6 (VO) | Filtered output | Low-pass filtered output (via external RO/CO); referenced to IACOMMON (Pin 10) |
| 7 (IACOMMON) | Output reference | Defines output voltage reference point; tied to low-side of R₂ in gain-setting network |
| 8 (NC) | No connect | Internally unused; must remain unconnected per datasheet |
| 9 (R₁) | Gain-setting resistor terminal | Connects external R₁ to set first-stage gain; minimum value 2 kΩ |
| 10 (R₂) | Gain-setting resistor terminal | Connects external R₂ to set second-stage gain; defines G = 2(R₂/R₁) |
Key Features
| Feature | Design Value |
|---|---|
| True rail-to-rail input | Operates linearly from (V−) −20 mV to (V+) +100 mV - eliminates level-shifting for ground-referenced shunts |
| Auto-correction noise reduction | 90 kHz internal oscillator cancels 1/f noise - achieves 0.8 µVP-P (0.01–10 Hz) at G = 100 |
| CMR independent of R-set accuracy | Current-mode architecture rejects common-mode errors even with unmatched external resistors |
| High-impedance shutdown output | Output enters Hi-Z state when disabled - enables safe multiplexing of multiple INA327EA/250 outputs |
| Low 1/f noise & drift | 0.4 µV/°C max drift and <33 nV/√Hz broadband noise support 24-bit delta-sigma ADC interfacing |
Applications
| Bridge Sensor Amplification | Multi-Channel Data Acquisition |
|---|---|
|
Use Scenario: Amplifying mV-level outputs from strain-gauge load cells in industrial weigh scales with 0.01% linearity requirement. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing programmable gain (G = 10–1000), rail-to-rail input to handle sensor offset, and low-drift output for 24-bit ADC digitization. Use Value: 100 µV max offset and 0.4 µV/°C drift ensure calibration stability over temperature, reducing recalibration frequency in field-deployed equipment. |
Use Scenario: Simultaneous sampling of 8 thermocouple channels in a portable environmental monitor powered by a 3.7 V Li-ion battery. IC Role / Device Role / Timing Role: Shutdown-capable signal conditioner enabling time-sliced channel activation; each INA327EA/250 powers up only during its assigned 100 µs sampling window. Use Value: 2 µA shutdown current allows 8-channel system to achieve <20 µA total standby current - extending battery life to >6 months between charges. |
| Medical Instrumentation | Battery-Powered Current Monitoring |
|
Use Scenario: Front-end amplification of ECG electrode signals in a wearable Holter monitor requiring DC-coupled, low-noise, and low-power operation. IC Role / Device Role / Timing Role: Rail-to-rail I/O instrumentation amplifier with 3.3 V single supply, rejecting electrode half-cell offsets while preserving sub-µV biopotential resolution. Use Value: 33 nV/√Hz input-referred noise at 1 kHz and 0.8 µVP-P (0.01–10 Hz) enable detection of 5 µV R-wave peaks without additional filtering overhead. |
Use Scenario: High-side current sensing in a solar charge controller measuring 0–20 A battery current with ±0.5% accuracy across –20°C to +70°C. IC Role / Device Role / Timing Role: Precision amplifier configured for G = 20 with external R₁/R₂, accepting shunt voltage referenced to +48 V bus while rejecting common-mode transients. Use Value: Input CMR extending 100 mV above V+ allows direct connection to high-side shunt without level-shifting, simplifying layout and improving transient immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA337 | Specified over –40°C to +125°C; same 0.4 µV/°C drift but no shutdown pin | Lacks enable function - unsuitable for power-gated systems; preferred for extended-temperature automotive or under-hood use | Select INA337 only if ambient operating temperature exceeds +85°C and shutdown is unnecessary |
| INA128 | 50 µV max VOS, 125 dB CMR, 750 µA IQ; no rail-to-rail input or shutdown | Higher precision offset but limited input range (±13 V on ±15 V supply); requires dual supply for full common-mode coverage | Choose INA128 only when ultra-low offset dominates over supply flexibility and power savings |
Compared with INA327EA/250, INA337 offers wider temperature qualification but forfeits power control, while INA128 improves offset spec at the cost of supply complexity and no shutdown - making INA327EA/250 optimal for battery-constrained, single-supply, industrial-grade measurement nodes.
Availability
INA327EA/250 is available at Aetrix Electronics and suitable for industrial weighing systems, portable medical devices, multi-channel data loggers, and battery-powered current monitors requiring stable component supply, long-term parametric consistency, and guaranteed traceability.
Supply support for INA327EA/250 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 INA327 belongs to TI's precision instrumentation amplifier product line, engineered specifically for high-accuracy, low-power sensor interface applications in industrial, medical, and test equipment where rail-to-rail operation and long-term stability are critical.
FAQ
What is the required connection for Pin 5 (Enable) on the INA327EA/250?
Pin 5 of the INA327EA/250 must be connected directly to V+ (positive supply) to ensure proper operation. Leaving it floating or connecting it to an undefined voltage risks unpredictable enable/disable behavior. When driven externally, logic high (>1.6 V) enables the amplifier; logic low (<0.25 V) disables it, reducing quiescent current to ~2 µA. The INA327EA/250 datasheet explicitly states this requirement in the "INA327 ENABLE FUNCTION" section.
Does the INA327EA/250 support true rail-to-rail input with single-supply operation?
Yes, the INA327EA/250 supports true rail-to-rail input: its linear input common-mode range extends 20 mV below V− and 100 mV above V+, even when powered from a single +2.7 V to +5.5 V supply. This is achieved via internal charge-pump circuitry - not standard rail-to-rail op-amps - enabling direct interfacing with grounded shunts or bridge sensors without level-shifting. This capability is confirmed in the "INPUT COMMON-MODE RANGE" section of the SBOS222D datasheet.
How does the auto-correction circuit in the INA327EA/250 reduce noise?
The INA327EA/250 integrates an internal 90 kHz ±20% auto-correction oscillator that actively cancels 1/f (flicker) noise, particularly effective at gains ≥100. This results in just 0.8 µVP-P (0.01–10 Hz) input-referred noise - significantly lower than conventional instrumentation amplifiers. The correction mechanism is inherent to the current-mode topology and requires no external components. This behavior is documented in the "NOISE PERFORMANCE" and "TYPICAL CHARACTERISTICS" sections of the SBOS222D datasheet.
Can the INA327EA/250 drive capacitive loads, and what is the limit?
The INA327EA/250 is specified to drive up to 500 pF of capacitive load while maintaining stability and specified settling time. Exceeding this may cause peaking or oscillation, especially when combined with series resistance in filter networks (e.g., RO/CO). For anti-aliasing filters ahead of ADCs, TI recommends keeping CO ≤ 500 pF and using low-dielectric-absorption capacitors (e.g., polypropylene) to avoid slow settling tails. This limit is explicitly stated in the "ELECTRICAL CHARACTERISTICS" table under "Capacitive Load Drive".
What is the purpose of Pin 7 (IACOMMON) on the INA327EA/250?
Pin 7 (IACOMMON) on the INA327EA/250 defines the reference node for the filtered output voltage (Pin 6). It is tied to the low-side terminal of the external R₂ gain-setting resistor and serves as the output's voltage reference - not ground. This allows the output to swing beyond the supply rails when configured appropriately (e.g., with R₂ referenced to a mid-supply voltage). Misconnecting IACOMMON invalidates output accuracy and is detailed in Figure 1 and the "APPLICATIONS INFORMATION" section of SBOS222D.
INA327EA/250 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:
- Active
- 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/250 FAQ
1.How can I place an order for INA327EA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA327EA/250 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/250 reliable?
The price and inventory of INA327EA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA327EA/250 is usually 5 days.
3.What payment methods are accepted for INA327EA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA327EA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA327EA/250?
INA327EA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA327EA/250 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/250?
For technical support, including INA327EA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA327EA/250 requirements.
6.How does Aetrix verify that INA327EA/250 is sourced from the original manufacturer or authorized distributors?
All INA327EA/250 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/250 meets industry standards.
7.What is the process for return or replacement of INA327EA/250?
All INA327EA/250 units undergo pre-shipment inspection (PSI). If there is an issue with INA327EA/250, 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/250 part is unused and in its original packaging.
Return procedure for INA327EA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA327EA/250 Tags
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