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Texas Instruments INA327EA/2K5
- Part No.:
- INA327EA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA327EA/2K5.pdf
- Description:
- IC INST AMP 1 CIRCUIT 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,953
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Product details
Overview
INA327EA/2K5 from Texas Instruments is a precision rail-to-rail input/output instrumentation amplifier with integrated shutdown control, designed for low-noise, high-accuracy sensor signal conditioning. It delivers 100 µV max offset voltage, 0.4 µV/°C max drift, and operates from +2.7 V to +5.5 V single supply across –40°C to +85°C - ideal for bridge-based weigh scales and multi-channel data acquisition systems.
For engineers reviewing the INA327EA/2K5 datasheet, INA327EA/2K5 pinout, INA327EA/2K5 application, or INA327EA/2K5 equivalent, key selection criteria include its true rail-to-rail input range (20 mV below V− to 100 mV above V+), 1 kHz filter-limited bandwidth, shutdown current of 2–5 µA, and MSOP-10 package compatibility with space-constrained industrial sensor nodes.
Technical Context
The INA327EA/2K5 implements a unique current-mode topology that converts differential input voltage into proportional current through R1, enabling common-mode rejection independent of external resistor matching. Its internal charge-pump supplies allow output swing within 10 mV of rails and linear input operation beyond supply rails.
Dynamic performance is governed by externally configured R2/C2 and RO/CO filters - typically set to 1 kHz or 10 kHz corner frequency - which jointly determine noise floor, settling time (0.95 ms @ 0.1% for 1 kHz filter), and overload recovery (30 µs). The enable pin (Pin 5) controls power-down with 75 µs wake-up and high-impedance output state when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage (max) | ±100 µV - ensures ≤0.1% gain error in 100 mV full-scale bridge measurements at G = 100 |
| Offset Drift (max) | ±0.4 µV/°C - supports stable calibration over industrial temperature range without recalibration |
| Input Common-Mode Range | (V−) − 20 mV to (V+) + 100 mV - enables direct connection to transducers operating near supply rails |
| Output Swing (RL = 10 kΩ) | Within 10 mV of rails - preserves dynamic range for ADCs with reference voltages near V+ or V− |
| Supply Range | +2.7 V to +5.5 V single supply - compatible with Li-ion, USB, and 3.3 V logic systems |
| Shutdown Current | 2–5 µA - extends battery life in portable medical or IoT sensor nodes during idle periods |
| Gain Equation | G = 2(R2/R1) - allows precise, resistor-set gains from 0.1× to >10,000× with external passive network |
Pinout & Package
INA327EA/2K5 is housed in a 10-pin MSOP (DGS) package with 0.5 mm pitch, optimized for high-density PCB layouts and thermal performance (θJA = 150°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN−) | Inverting input | Differential input node; requires bias current return path (≤ ±0.2 nA) for stable DC operation |
| 2 (VIN+) | Non-inverting input | Differential input node; same bias current requirement as Pin 1 |
| 3 (V−) | Negative supply | Ground or negative rail reference; must be bypassed with 0.1 µF capacitor to Pin 4 |
| 4 (V+) | Positive supply | +2.7 V to +5.5 V supply; bypassing critical for noise and CMR performance |
| 5 (Enable) | Shutdown control | Logic-high (>1.6 V) enables amplifier; logic-low (<0.25 V) disables and reduces IQ to µA range |
| 6 (VO) | Filtered output | Low-pass filtered output (RO/CO); used directly with ADCs or further buffered |
| 7 (IACOMMON) | Output reference | Reference point for VO; tied to low-side of R2 - defines output common-mode level |
| 8 (NC) | No connect | Internally unused; must remain unconnected per datasheet |
| 9 (R1) | Gain-setting resistor terminal | Connects to external R1; sets first-stage gain and influences offset/drift via equation VOS ≈ 10 µV + (50 nA)(R2)/G |
| 10 (R2) | Gain-setting resistor terminal | Connects to external R2 and C2; determines overall gain G = 2(R2/R1) and filter pole location |
Key Features
| Feature | Design Value |
|---|---|
| True rail-to-rail input | Operates linearly 20 mV below V− and 100 mV above V+, eliminating need for level-shifting in single-supply sensor interfaces |
| Auto-correction architecture | Reduces 1/f noise to <0.8 µVp-p (0.01–10 Hz) at G ≥ 100, enabling stable µV-level DC measurements |
| CMR independent of resistor matching | 114 dB typical CMR at DC (G = 100) without requiring precision external resistors - simplifies BOM and layout |
| Programmable filter bandwidth | R2/C2 and RO/CO allow trade-off between noise (↓ with lower fc) and settling time (↑ with lower fc) - configurable for 1 kHz or 10 kHz systems |
| High-impedance shutdown output | Output enters high-Z state when disabled - permits multiplexing multiple INA327EA/2K5 outputs onto shared bus without contention |
Applications
| Bridge Sensor Amplification | Multi-Channel Data Acquisition |
|---|---|
Use Scenario: Amplifying mV-level differential output from load cell or strain gauge in industrial weighing system with 3.3 V microcontroller interface. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and rail-to-rail output swing referenced to IACOMMON. Use Value: Enables direct connection to 12-bit/16-bit SAR ADCs without level-shifting; 100 µV offset ensures ≤0.01% measurement error at 10 mV full scale. | Use Scenario: Simultaneous monitoring of 8 thermocouple channels in HVAC controller using multiplexed analog front-end. IC Role / Device Role / Timing Role: Channel-isolated signal conditioner with shutdown control - individual amplifiers powered only during sampling. Use Value: Reduces system quiescent current by >99% during idle; 75 µs enable time allows synchronized channel scanning at ≥10 kSPS. |
| Portable Medical Instrumentation | Battery-Powered Test Equipment |
Use Scenario: Low-power ECG front-end where electrode signals require high CMR and minimal DC drift over 8-hour clinical use. IC Role / Device Role / Timing Role: Single-supply instrumentation amplifier with shutdown for intermittent measurement cycles. Use Value: 0.4 µV/°C drift prevents baseline wander; 2 µA shutdown current extends AA battery life to >6 months in sleep mode. | Use Scenario: Handheld multimeter measuring µV-level thermopile outputs while maintaining 100-hour battery runtime. IC Role / Device Role / Timing Role: Precision gain stage preceding auto-ranging ADC, enabled only during active measurement. Use Value: Eliminates need for external power-gating FETs; integrated enable pin reduces component count and PCB area by 30% vs discrete solutions. |
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 | Same architecture; extended temp range (–40°C to +125°C); identical offset/drift specs | Required for under-hood automotive or high-temp industrial environments | Select when operating ambient exceeds +85°C - no layout change needed |
| INA128UA/2K5 | Higher offset (50 µV typ), higher IQ (750 µA), no shutdown, SO-8 package | Lacks rail-to-rail input; limited to mid-rail common-mode applications | Choose only if cost sensitivity outweighs precision and power requirements |
Compared with INA337EA/2K5, the INA327EA/2K5 offers identical precision but lower temperature rating; versus INA128UA/2K5, it provides superior DC accuracy, rail-to-rail capability, and 300× lower shutdown current - making it optimal for battery-powered, high-fidelity sensor nodes.
Availability
INA327EA/2K5 is available at Aetrix Electronics and suitable for weigh scales, medical instrumentation, and multi-channel data acquisition systems requiring stable component supply, long-term calibration integrity, and low-power shutdown capability.
Supply support for INA327EA/2K5 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 INA327EA/2K5 belongs to TI's precision instrumentation amplifier product line, engineered specifically for low-drift, low-noise amplification of weak sensor signals in single-supply industrial and medical systems.
FAQ
What is the maximum allowable input voltage beyond the supply rails for INA327EA/2K5?
The INA327EA/2K5 supports an input common-mode range from (V−) − 20 mV to (V+) + 100 mV under normal operation. Input signals exceeding (V−) − 0.5 V or (V+) + 0.5 V must be current-limited to ≤10 mA to protect internal clamp diodes. This safe overvoltage margin enables robust interfacing with transducers whose outputs may transiently exceed rails.
How does the Enable pin on INA327EA/2K5 affect output behavior during shutdown?
When the Enable pin of INA327EA/2K5 is driven low (<0.25 V), the amplifier disables and its output enters a high-impedance state - not a tri-state or forced-rail condition. This allows safe multiplexing of multiple INA327EA/2K5 outputs onto a shared bus without contention or loading. Output resumes normal operation 75 µs after Enable returns high.
Can INA327EA/2K5 achieve gains less than 1, and what are the limitations?
Yes, INA327EA/2K5 supports gains as low as 0.1× using the G = 2(R2/R1) equation. However, gains <1 require R2 < R1, reducing output drive capability and increasing susceptibility to noise. At G = 0.1, output swing is limited to ~1 Vpp due to internal stage headroom - verify against load and filter requirements in the target application.
What is the role of the IACOMMON pin (Pin 7) in INA327EA/2K5 circuit operation?
The IACOMMON pin (Pin 7) of INA327EA/2K5 defines the reference point for the filtered output voltage VO. It connects to the low-side of the external R2 resistor and establishes the output common-mode level. Unlike conventional instrumentation amplifiers, this pin decouples output referencing from supply rails - enabling flexible level-shifting and accurate measurement near ground or V+ without additional op-amps.
Why does INA327EA/2K5 specify different R2/C2 values for single-supply vs dual-supply configurations?
INA327EA/2K5 specifies different R2/C2 values because single-supply operation (e.g., +5 V only) requires larger R2 to maintain output current ≤±25 µA while preserving full rail-to-rail swing - otherwise, excessive current degrades offset and drift. Dual-supply designs (e.g., ±2.5 V) permit smaller R2, yielding lower input-referred offset. The datasheet tables explicitly separate these cases to ensure optimal performance in each topology.
INA327EA/2K5 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/2K5 FAQ
1.How can I place an order for INA327EA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA327EA/2K5 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/2K5 reliable?
The price and inventory of INA327EA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA327EA/2K5 is usually 5 days.
3.What payment methods are accepted for INA327EA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA327EA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA327EA/2K5?
INA327EA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA327EA/2K5 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/2K5?
For technical support, including INA327EA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA327EA/2K5 requirements.
6.How does Aetrix verify that INA327EA/2K5 is sourced from the original manufacturer or authorized distributors?
All INA327EA/2K5 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/2K5 meets industry standards.
7.What is the process for return or replacement of INA327EA/2K5?
All INA327EA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA327EA/2K5, 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/2K5 part is unused and in its original packaging.
Return procedure for INA327EA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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