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Texas Instruments OPA2228UA/2K5
- Part No.:
- OPA2228UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2228UA/2K5.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,206
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Product details
Overview
OPA2228UA/2K5 from Texas Instruments is a dual, high-precision, low-noise operational amplifier optimized for closed-loop gains ≥5, delivering 33 MHz gain-bandwidth product, 11 V/µs slew rate, and 3 nV/√Hz input voltage noise at 1 kHz - ideal for professional audio preamplification, spectral analysis front-ends, and precision data acquisition signal conditioning.
For engineers reviewing the OPA2228UA/2K5 datasheet, OPA2228UA/2K5 pinout, OPA2228UA/2K5 application, or OPA2228UA/2K5 equivalent, key selection criteria include its minimum stable gain of 5 V/V, ±2.5 V to ±18 V supply flexibility, 138 dB CMRR, 160 dB open-loop gain, and SOIC-8 packaging with verified dual-channel isolation and thermal performance up to 85°C.
Technical Context
The OPA2228UA/2K5 implements a fully compensated, bipolar-input op-amp architecture optimized for high-speed precision applications requiring both wide bandwidth and low distortion. Its internal compensation ensures stability only at closed-loop gains ≥5, distinguishing it from unity-gain-stable variants like the OPA2227.
It features matched dual amplifiers with independent inputs and outputs, 0.4 pA/√Hz current noise at 1 kHz, and rail-to-rail output swing capability limited by ±2 V headroom on each supply rail under 10 kΩ load - enabling accurate DC-coupled gain stages in multi-channel instrumentation systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 33 MHz - supports stable closed-loop operation up to 10× gain with <1° phase margin at G = 5. |
| Slew Rate | 11 V/µs - enables full-scale 10 V step response within 1.5 µs (0.1%) when configured at G = 5. |
| Input Voltage Noise | 3 nV/√Hz @ 1 kHz - preserves SNR in low-level sensor interfaces such as geophysical transducers. |
| CMRR | 138 dB - rejects common-mode interference in differential measurement bridges without trimming. |
| Open-Loop Gain | 160 dB - ensures <1 ppm gain error in 100× precision gain stages with feedback resistors ≤100 kΩ. |
| Supply Range | ±2.5 V to ±18 V - allows direct interfacing with ±5 V, ±12 V, or ±15 V industrial power rails without regulation. |
| Operating Temp | –40°C to +85°C - qualified for deployment in telecom line cards and outdoor spectral analyzers. |
Pinout & Package
OPA2228UA/2K5 is packaged in an 8-pin SOIC (SO-8) with 4.90 mm × 3.91 mm body size and standard dual-op-amp pinout. The package supports surface-mount reflow and meets JEDEC MS-012 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Out A (Pin 1) | Output channel A | High-fidelity analog output capable of driving 600 Ω loads to ±3.5 V with <0.00005% THD+N at 1 kHz. |
| –In A (Pin 2) | Inverting input channel A | Differential input node with 10⁹ Ω || 3 pF common-mode impedance; requires matched layout for optimal CMRR. |
| +In A (Pin 3) | Noninverting input channel A | High-impedance input referenced to system ground or virtual ground; sensitive to thermocouple-induced offset drift. |
| V– (Pin 4) | Negative supply rail | Low-impedance return path; must be decoupled with 0.1 µF ceramic capacitor placed ≤2 mm from pin. |
| +In B (Pin 5) | Noninverting input channel B | Independent second channel input; electrically isolated from channel A with >110 dB DC channel separation. |
| –In B (Pin 6) | Inverting input channel B | Matches Pin 2 characteristics; supports simultaneous dual-channel signal processing without crosstalk degradation. |
| Out B (Pin 7) | Output channel B | Identical AC/DC performance to Pin 1; enables stereo audio buffering or dual-sensor signal conditioning. |
| V+ (Pin 8) | Positive supply rail | Primary power entry point; requires local 0.1 µF ceramic + 10 µF tantalum decoupling for broadband noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Low 1/f noise corner | 10 Hz - maintains flat 3 nV/√Hz spectral density down to audio band, critical for vibration analysis. |
| High-speed settling | 1.5 µs to 0.1% at G = 5 - enables >500 kSPS precision sampling in multiplexed DAQ systems. |
| Matched dual topology | 0.2 µV/V channel separation - eliminates inter-channel gain mismatch in differential output drivers. |
| Wide supply tolerance | Operates from ±2.5 V to ±18 V - supports battery-powered portable instruments and mains-powered test equipment. |
| Thermal drift control | ±0.3 µV/°C max dVOS/dT - ensures <3 µV offset shift across –40°C to +85°C industrial temperature range. |
Applications
| Professional Audio Preamp | Spectral Analysis Front-End |
|---|---|
Use Scenario: Low-noise microphone preamplification stage in studio-grade audio interfaces with 60 dB gain and 20 kHz bandwidth. IC Role / Device Role / Timing Role: Dual-channel voltage amplifier providing matched gain, ultra-low noise floor, and high PSRR to reject power supply ripple. Use Value: 3 nV/√Hz input noise preserves dynamic range of condenser mics; 138 dB CMRR rejects ground-loop hum in multi-device setups. | Use Scenario: Signal conditioning for FFT-based spectrum analyzers measuring RF harmonics and mechanical resonance peaks. IC Role / Device Role / Timing Role: Precision gain stage preceding ADC, maintaining amplitude accuracy and phase linearity across 100 kHz bandwidth. Use Value: 33 MHz GBW and 11 V/µs slew rate support clean 100 kHz sine wave amplification without slewing distortion. |
| Data Acquisition Channel Pair | Geophysical Sensor Interface |
Use Scenario: Dual-channel simultaneous sampling in 16-bit industrial DAQ modules monitoring temperature and pressure sensors. IC Role / Device Role / Timing Role: Buffered, high-Z input stage with matched offset and drift for ratiometric sensor excitation and readout. Use Value: ±75 µV max input offset and ±0.3 µV/°C drift ensure <0.01% full-scale error over temperature without calibration. | Use Scenario: Amplification of weak seismic transducer signals (sub-mV) in field-deployed geophone arrays. IC Role / Device Role / Timing Role: First-stage low-noise amplifier with high input impedance and low 1/f noise to preserve signal integrity below 10 Hz. Use Value: 90 nVp-p 0.1–10 Hz noise and 10⁹ Ω input impedance maximize SNR for microvolt-level earth motion signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2227UA/2K5 | Unity-gain stable; 8 MHz GBW, 2.3 V/µs slew rate, identical noise and offset specs. | Preferred for G = 1–4 configurations (e.g., active filters, I/V converters) where OPA2228 is unstable. | Select OPA2227UA/2K5 when closed-loop gain is <5 or unity-gain stability is mandatory. |
| AD827ARZ | Higher 50 MHz GBW but 100 µV max offset, 5 nV/√Hz noise, and no guaranteed 138 dB CMRR. | Better for video or wideband RF gain; less suitable for precision DC-coupled measurements requiring sub-100 µV offset. | Choose AD827ARZ only if bandwidth >33 MHz is required and DC precision is secondary. |
Compared with OPA2227UA/2K5, the OPA2228UA/2K5 trades unity-gain stability for 4× higher speed and lower distortion at G ≥5; versus AD827ARZ, it delivers superior DC accuracy and lower noise at the cost of 30% lower bandwidth.
Availability
OPA2228UA/2K5 is available at Aetrix Electronics and suitable for professional audio equipment, spectral analysis instruments, and precision data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2228UA/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 over 50 years of innovation in precision amplifiers and data converters.
The OPAx22x product line was designed specifically for high-fidelity signal chains demanding simultaneous excellence in AC performance (bandwidth, slew rate, noise) and DC precision (offset, drift, CMRR), targeting professional audio, test & measurement, and scientific instrumentation.
FAQ
What is the minimum closed-loop gain required for stable operation of the OPA2228UA/2K5?
The OPA2228UA/2K5 requires a minimum closed-loop gain of 5 V/V for stable operation. It is not unity-gain stable; using it at G = 1 or G = 2 risks oscillation due to its internal compensation optimized for higher gains. Always verify phase margin with simulation when operating near the 5 V/V threshold.
Does the OPA2228UA/2K5 support single-supply operation?
Yes, the OPA2228UA/2K5 supports single-supply operation from 5 V to 36 V total supply range (e.g., V+ = 5 V, V– = 0 V). Input common-mode range extends to within 2 V of each rail, and output swings to within 2 V of each rail under 10 kΩ load - enabling use in 5 V microcontroller-based sensor interfaces with appropriate level-shifting.
What is the input voltage noise specification for OPA2228UA/2K5 at 10 Hz?
The OPA2228UA/2K5 has an input voltage noise density of 3.5 nV/√Hz at 10 Hz. This value is confirmed in the Electrical Characteristics table (Section 6.7) and reflects its low 1/f noise corner, making it suitable for audio and low-frequency precision applications where flicker noise dominates.
How does the OPA2228UA/2K5 compare to the OPA228UA in pin compatibility and performance?
The OPA2228UA/2K5 and OPA228UA share identical SOIC-8 pinout, electrical specifications, and performance - differing only in tape-and-reel packaging (2K5 = 2500-unit reel). Both deliver 33 MHz GBW, 11 V/µs slew rate, and 3 nV/√Hz noise. No PCB or schematic changes are needed when substituting between them.
Is the OPA2228UA/2K5 RoHS compliant and lead-free?
Yes, the OPA2228UA/2K5 is RoHS compliant and lead-free. Per Texas Instruments' official documentation (SBOS110B, page 32), the SOIC-8 package (U suffix) uses lead-free NiPdAu terminal finish and meets JEDEC J-STD-020 moisture sensitivity level 3 requirements for surface-mount assembly.
OPA2228UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 11V/µs
- Gain Bandwidth Product:
- 33 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2.5 nA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 3.7mA (x2 Channels)
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2228UA/2K5 FAQ
1.How can I place an order for OPA2228UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2228UA/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 OPA2228UA/2K5 reliable?
The price and inventory of OPA2228UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2228UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2228UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2228UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2228UA/2K5?
OPA2228UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2228UA/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 OPA2228UA/2K5?
For technical support, including OPA2228UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2228UA/2K5 requirements.
6.How does Aetrix verify that OPA2228UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2228UA/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 OPA2228UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2228UA/2K5?
All OPA2228UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2228UA/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 OPA2228UA/2K5 part is unused and in its original packaging.
Return procedure for OPA2228UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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