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Texas Instruments OPA209AID
- Part No.:
- OPA209AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA209AID.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:614
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Product details
Overview
OPA209AID from Texas Instruments is a single-channel, precision, low-noise operational amplifier in an 8-pin SOIC package. It delivers 2.2 nV/√Hz voltage noise at 1 kHz, 130 nVPP 0.1-Hz to 10-Hz noise, 18 MHz gain bandwidth, 6.4 V/µs slew rate, and rail-to-rail output swing - enabling high-fidelity signal conditioning in low-power, high-accuracy data acquisition systems.
For engineers reviewing the OPA209AID datasheet, OPA209AID pinout, OPA209AID application, or OPA209AID equivalent, this page provides verified specifications, SOIC-8 pin mapping, real-world use cases in instrumentation and ADC driving, and two validated alternative op amps with documented functional and parametric distinctions.
Technical Context
The OPA209AID uses a SiGe bipolar process to achieve unity-gain stability without phase reversal, supporting supply voltages from ±2.25 V to ±18 V (or 4.5 V to 36 V single-ended). Its input stage features back-to-back diodes for differential overvoltage protection, and its output drives ±65 mA short-circuit current while maintaining rail-to-rail swing into 10 kΩ loads.
It achieves 16-bit settling in 2.6 µs for a 10-V step with 100 pF load, and exhibits 120–132 dB open-loop gain and 120–130 dB CMRR across –40°C to 125°C. Input offset voltage is specified ≤150 µV (max), with drift ≤3 µV/°C, making it suitable for precision DC-coupled amplification where long-term stability matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 2.2 nV/√Hz at 1 kHz - enables ultra-low-noise amplification of microvolt-level sensor signals without dominating source resistance noise. |
| 0.1–10 Hz Noise | 130 nVPP - critical for precision DC and low-frequency measurements (e.g., strain gauges, thermopiles) where flicker noise impacts accuracy. |
| Gain Bandwidth Product | 18 MHz - supports stable closed-loop operation up to ~1.8 MHz at G = 10, sufficient for fast-settling ADC drivers and active filters. |
| Slew Rate | 6.4 V/µs - ensures faithful reproduction of 1-MHz, 6.4-VPP sine waves and rapid transient response in control loop feedback paths. |
| Supply Range | ±2.25 V to ±18 V (or 4.5 V to 36 V) - allows flexible integration into industrial 24-V systems, battery-powered portable instruments, and dual-rail lab equipment. |
| Output Swing | Rail-to-rail - maximizes dynamic range by delivering output within 200 mV of each rail at 10 kΩ load, preserving SNR in low-voltage systems. |
| Quiescent Current | 2.5 mA per channel (max) - balances low-noise performance with power efficiency in always-on monitoring circuits. |
Pinout & Package
OPA209AID is housed in an 8-pin SOIC (D package) with 4.90 mm × 3.91 mm body size and standard 1.27-mm pitch. The package is RoHS-compliant, surface-mountable, and rated for operation from –40°C to +125°C.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - drives external load or next-stage input; capable of ±65 mA short-circuit current and rail-to-rail swing. |
| 2 | –IN | Inverting input - forms feedback node in inverting configurations; accepts input signals referenced to system ground or virtual ground. |
| 3 | +IN | Noninverting input - used for direct signal injection in buffer or noninverting gain stages; high common-mode rejection applies here. |
| 4 | V– | Negative supply terminal - must be decoupled with 0.1-µF capacitor close to pin; sets lower voltage rail for dual-supply operation. |
| 5 | NC | No internal connection - left unconnected; no routing or thermal relief required on PCB. |
| 6 | NC | No internal connection - unused pin; electrically and thermally isolated from die. |
| 7 | NC | No internal connection - not bonded; may be used as thermal pad anchor if needed, but carries no signal or power. |
| 8 | V+ | Positive supply terminal - supplies bias current and output drive capability; requires local 0.1-µF ceramic decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable, no phase reversal | Eliminates risk of oscillation or output inversion during overdrive or common-mode transients - essential for reliable PLL loop filters and safety-critical monitoring. |
| Low 1/f noise corner | 0.1-Hz to 10-Hz noise of 130 nVPP confirms minimal flicker contribution - directly improves DC accuracy in weigh scales and medical front-ends. |
| High PSRR & CMRR | ≥120 dB PSRR and ≥120 dB CMRR over full temperature range suppresses supply ripple and ground bounce in noisy industrial environments. |
| Fast 16-bit settling | 2.6 µs to 0.0015% (16-bit) for 10-V step ensures compatibility with 1 MSPS+ SAR ADCs without timing margin loss. |
| Robust ESD protection | ±3000 V HBM and ±1000 V CDM ratings reduce field failure risk during handling and board assembly in automated manufacturing. |
Applications
| PLL Loop Filter | High-Performance ADC Driver |
|---|---|
Use Scenario: Filtering reference spurs and VCO phase noise in frequency synthesizers for wireless base stations. IC Role / Device Role / Timing Role: Integrator in 2nd- or 3rd-order passive/active loop filter; maintains loop stability while minimizing integrated jitter. Use Value: 2.2 nV/√Hz noise and 18 MHz GBW enable sub-0.1° RMS jitter contribution below 100 kHz loop bandwidth. |
Use Scenario: Driving the input of a 16-bit, 1-MSPS SAR ADC in precision data loggers for environmental sensing. IC Role / Device Role / Timing Role: Buffer and gain stage preceding ADC sample-and-hold; provides low-impedance, low-noise source matching. Use Value: 2.6 µs 16-bit settling and rail-to-rail output ensure full-scale utilization and <0.5 LSB missing codes across temperature. |
| Low-Noise Instrumentation Amplifier | Ultrasound Amplifier |
Use Scenario: First-stage amplification of µV-level bio-potential signals (e.g., ECG, EEG) in portable diagnostics. IC Role / Device Role / Timing Role: Gain-setting amplifier in 3-op-amp IA topology; defines input-referred noise floor and common-mode rejection. Use Value: 130 nVPP 0.1–10 Hz noise and ≤150 µV offset minimize baseline wander and improve diagnostic confidence. |
Use Scenario: Time-gain compensation (TGC) amplifier in handheld ultrasound probes receiving weak echoes from deep tissue. IC Role / Device Role / Timing Role: Variable-gain, low-noise preamplifier with wide dynamic range; interfaces piezoelectric transducer to ADC. Use Value: 6.4 V/µs slew rate supports >1 MHz echo bursts; rail-to-rail swing preserves SNR across 120-dB TGC range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA211AID | Lower 1/f noise (110 nVPP), higher GBW (45 MHz), higher IQ (3.6 mA), FET input (lower IB). | Better for high-source-impedance sensors (>10 kΩ) and faster settling; less optimal for ultra-low-voltage-noise (<2.5 nV/√Hz) requirements. | Select OPA211AID when current noise dominates (e.g., photodiode amps); retain OPA209AID for lowest voltage noise at low ZS. |
| OPA189AID | Zero-drift architecture, 0.005 µV/°C drift, 5.2 nV/√Hz noise, 10 MHz GBW, 1.3 mA IQ. | Superior DC accuracy and drift stability; trades voltage noise and speed for near-zero offset drift over temperature. | Choose OPA189AID for millivolt-level DC measurements over wide temperature ranges; choose OPA209AID for AC-coupled, wideband, low-noise signal chains. |
Compared with OPA211AID and OPA189AID, the OPA209AID uniquely balances sub-2.5 nV/√Hz voltage noise, 18 MHz bandwidth, and 2.5 mA quiescent current - making it the preferred choice for battery-powered, wideband, precision analog front-ends where voltage noise is the dominant error source.
Availability
OPA209AID is available at Aetrix Electronics and suitable for high-precision data acquisition, medical instrumentation, and industrial sensor signal conditioning requiring stable component supply and long-term manufacturability.
Supply support for OPA209AID 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 innovation in precision amplifiers and signal chain solutions.
The OPA209AID belongs to TI's OPAx209 series of low-noise, precision op amps designed specifically for high-resolution data acquisition, test equipment, and professional audio signal paths where voltage noise, bandwidth, and DC accuracy are co-critical.
FAQ
What is the maximum supply voltage for OPA209AID?
The absolute maximum supply voltage for OPA209AID is 40 V total (i.e., V+ – V– ≤ 40 V). Operation beyond this risks permanent damage. The recommended operating range is ±2.25 V to ±18 V dual supply or 4.5 V to 36 V single supply. At ±18 V, OPA209AID delivers full specified performance including 6.4 V/µs slew rate and rail-to-rail output swing.
Does OPA209AID require external compensation for unity-gain stability?
No, OPA209AID is internally compensated and unity-gain stable without external components. Its design eliminates phase reversal and ensures stable operation in G = 1 buffer, inverting, and noninverting configurations - confirmed across all load conditions up to 100 pF and temperatures from –40°C to +125°C.
What is the input offset voltage specification for OPA209AID?
OPA209AID has a maximum input offset voltage of ±150 µV at 25°C, with typical value of ±35 µV. Over the full –40°C to +125°C temperature range, offset drift is guaranteed ≤3 µV/°C. This level of DC precision supports 16-bit system accuracy without frequent calibration in applications like weigh scales and precision DAC buffers.
Can OPA209AID drive capacitive loads?
Yes, OPA209AID is characterized for stable operation with capacitive loads up to 100 pF in G = –1 configuration and up to 300 pF in G = +1, per typical characteristics. For loads >100 pF, adding a small series resistor (e.g., 10–50 Ω) between amplifier output and capacitance restores phase margin without degrading DC accuracy.
Is OPA209AID suitable for single-supply operation?
Yes, OPA209AID operates from a single supply as low as 4.5 V and as high as 36 V. Its rail-to-rail output and input common-mode range extending to within 1.5 V of each rail (V– +1.5 V to V+ –1.5 V) allow robust signal handling in 5-V or 24-V systems - ideal for industrial PLC analog I/O modules and portable battery-powered instruments.
OPA209AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 6.4V/µs
- Gain Bandwidth Product:
- 18 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 nA
- Voltage - Input Offset:
- 35 µV
- Current - Supply:
- 2.2mA
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA209AID FAQ
1.How can I place an order for OPA209AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA209AID 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 OPA209AID reliable?
The price and inventory of OPA209AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA209AID is usually 5 days.
3.What payment methods are accepted for OPA209AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA209AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA209AID?
OPA209AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA209AID 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 OPA209AID?
For technical support, including OPA209AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA209AID requirements.
6.How does Aetrix verify that OPA209AID is sourced from the original manufacturer or authorized distributors?
All OPA209AID 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 OPA209AID meets industry standards.
7.What is the process for return or replacement of OPA209AID?
All OPA209AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA209AID, 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 OPA209AID part is unused and in its original packaging.
Return procedure for OPA209AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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