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Texas Instruments OPA2228U/2K5
- Part No.:
- OPA2228U/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2228U/2K5.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,821
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Product details
Overview
OPA2228U/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 - used in professional audio preamplifiers, spectral analysis front-ends, and precision data acquisition systems.
For engineers reviewing the OPA2228U/2K5 datasheet, OPA2228U/2K5 pinout, OPA2228U/2K5 application, or OPA2228U/2K5 equivalent, key selection criteria include closed-loop stability at G ≥ 5, thermal drift performance (±0.3 µV/°C max), rail-to-rail output swing capability under ±15 V supply, and SOIC-8 package compatibility with space-constrained analog signal chains.
Technical Context
The OPA2228U/2K5 implements a fully compensated, bipolar-input op-amp architecture with internal frequency compensation tailored for stable operation at closed-loop gains of 5 V/V or higher. Its 33 MHz GBW and 11 V/µs slew rate enable fast settling (1.5 µs to 0.1% at G = 5) without external compensation components.
It features matched dual-channel topology with 0.2 µV/V channel separation, differential input impedance of 10⁷ Ω || 12 pF, and common-mode rejection of 138 dB at DC - enabling high-fidelity differential signal conditioning in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 33 MHz - supports stable closed-loop amplification up to 33 MHz at unity gain, but designed for optimal performance at G ≥ 5. |
| Slew Rate | 11 V/µs - enables accurate reproduction of fast transient signals (e.g., audio transients, pulse edges) without slew-induced distortion. |
| Input Voltage Noise | 3 nV/√Hz @ 1 kHz - ensures minimal added noise in low-level sensor signal amplification (e.g., piezoelectric, strain gauge). |
| Input Bias Current | ±10 nA max - compatible with high-impedance source networks (e.g., photodiode transimpedance stages) without significant offset error. |
| CMRR | 138 dB - rejects common-mode interference in differential measurement setups (e.g., bridge sensors, ECG front-ends). |
| Supply Range | ±2.5 V to ±18 V - supports operation from low-power portable systems (±2.5 V) to high-dynamic-range instrumentation (±18 V). |
| Offset Voltage | ±75 µV max - guarantees sub-100 µV DC error in precision DC-coupled gain stages without trimming. |
Pinout & Package
OPA2228U/2K5 is housed in an 8-pin SOIC (SO-8) package measuring 4.90 mm × 3.91 mm, optimized for surface-mount assembly and thermal performance (RθJA = 101.9 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Out A | Output channel A | Amplified signal output for first op-amp channel; drives loads ≥ 600 Ω with ±3.5 V swing under ±15 V supply. |
| –In A | Inverting input channel A | Negative feedback node for channel A; accepts input signals within (V–)+2 V to (V+)-2 V common-mode range. |
| +In A | Noninverting input channel A | Positive input node for channel A; high-impedance (10⁹ Ω || 3 pF) interface for reference or sensor signals. |
| V– | Negative power supply | Lowest potential rail; must be decoupled with 0.1 µF capacitor near pin for stable high-frequency operation. |
| +In B | Noninverting input channel B | Independent positive input for second op-amp channel; electrically isolated from channel A with 0.2 µV/V crosstalk. |
| –In B | Inverting input channel B | Independent negative feedback node for channel B; supports identical configuration as channel A. |
| Out B | Output channel B | Second independent output; matches Out A in AC/DC performance and load drive capability. |
| V+ | Positive power supply | Highest potential rail; requires local 0.1 µF ceramic decoupling to suppress supply noise coupling into analog signal path. |
Key Features
| Feature | Design Value |
|---|---|
| Closed-loop gain optimization | Stable operation at G ≥ 5 eliminates need for external compensation, reducing BOM count and layout complexity. |
| Ultra-low 1/f noise corner | Sub-10 Hz voltage noise corner enables high-precision DC + AC measurements without notch filtering. |
| Matched dual-channel performance | 0.2 µV/V channel separation and <±0.6 µV/°C drift matching ensure consistent behavior across both amplifiers in mixed-signal systems. |
| Wide supply flexibility | Operates from ±2.5 V to ±18 V with full specification compliance - supports battery-powered and mains-powered designs without redesign. |
| High open-loop gain | 160 dB AOL ensures <0.001% gain error in precision instrumentation amplifier configurations using external resistors. |
Applications
| Professional Audio Preamp | Spectral Analysis Front-End |
|---|---|
Use Scenario: Low-noise microphone preamplification stage in studio-grade audio interfaces requiring >120 dB dynamic range. IC Role / Device Role / Timing Role: Dual-channel voltage amplifier providing 40 dB gain with <0.00005% THD+N at 1 kHz and 3.5 Vrms output. Use Value: 3 nV/√Hz input noise preserves signal integrity of weak mic-level signals; dual configuration enables stereo or differential input processing. | Use Scenario: Signal conditioning for FFT-based vibration analyzers measuring mechanical resonance in rotating equipment. IC Role / Device Role / Timing Role: High-speed, low-drift gain stage preceding 16-bit ADC sampling at 100 kSPS. Use Value: 33 MHz GBW and 11 V/µs slew rate support clean amplification of wideband transducer outputs up to 100 kHz without phase distortion. |
| Data Acquisition System | Geophysical Sensor Interface |
Use Scenario: Precision analog front-end in portable environmental monitoring units measuring temperature, pressure, and gas concentration. IC Role / Device Role / Timing Role: Dual-channel programmable-gain amplifier (PGA) core with selectable gain paths (G = 5, 10, 100). Use Value: ±75 µV max offset and ±0.3 µV/°C drift minimize calibration burden; SOIC-8 footprint enables compact multi-channel PCB layouts. | Use Scenario: Seismic sensor signal conditioning in oil exploration equipment operating across –40°C to +85°C ambient range. IC Role / Device Role / Timing Role: Low-drift, high-CMRR amplifier for geophone or accelerometer outputs buried in high-common-mode noise. Use Value: 138 dB CMRR rejects ground loop interference; ±10 nA input bias current avoids loading high-impedance geophone coils. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA228UA | Same die, SOIC-8 package, identical electrical specs - differs only in tape-and-reel packaging (U vs U/2K5) and test screening. | No functional difference; both rated for –40°C to +85°C operation and share identical qualification data. | Select OPA2228U/2K5 for standard 2k-unit reel; choose OPA228UA for single-unit sampling or alternate packaging requirements. |
| AD827ARZ | Higher input bias current (±500 nA), lower CMRR (100 dB), wider noise floor (6 nV/√Hz), but unity-gain stable and faster (50 MHz GBW). | Better suited for unity-gain video buffers or wideband non-inverting stages where speed outweighs DC precision. | Choose AD827ARZ only when unity-gain stability is mandatory and 3 nV/√Hz noise is not required; not drop-in for OPA2228U/2K5 in precision DC-coupled designs. |
Compared with OPA2228U/2K5, OPA228UA offers identical performance in a different packaging format, while AD827ARZ trades DC precision and noise for broader bandwidth and unity-gain stability - making it unsuitable as a direct replacement in closed-loop G ≥ 5 precision applications.
Availability
OPA2228U/2K5 is available at Aetrix Electronics and suitable for professional audio equipment, spectral analysis instruments, and geophysical sensing systems requiring stable component supply with guaranteed long-term manufacturability.
Supply support for OPA2228U/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 90 years of innovation in precision analog ICs.
The OPAx22x product line was engineered for high-fidelity signal conditioning in applications demanding simultaneous excellence in AC bandwidth, DC accuracy, and low-noise performance - targeting audio, instrumentation, and scientific measurement markets.
FAQ
What is the minimum closed-loop gain for stable operation of the OPA2228U/2K5?
The OPA2228U/2K5 is optimized for stable operation at closed-loop gains of 5 V/V or greater. It is not unity-gain stable; attempting G = 1 may cause peaking or oscillation. For unity-gain applications, TI recommends the OPA227 series instead. The 5-V/V minimum ensures phase margin remains >60° across temperature and process variations, as verified in the SBOS110B datasheet.
Does the OPA2228U/2K5 require external compensation capacitors?
No, the OPA2228U/2K5 does not require external compensation capacitors when used at closed-loop gains of 5 V/V or higher. Its internal compensation is factory-set for this gain range. Adding external capacitance may degrade stability or bandwidth. Decoupling capacitors (0.1 µF ceramic) are required on V+ and V– pins, but these serve power integrity - not frequency compensation.
What is the maximum capacitive load the OPA2228U/2K5 can drive without instability?
The OPA2228U/2K5 can safely drive up to 100 pF capacitive load in unity-gain follower configuration, but for closed-loop gains ≥5, it supports ≥1000 pF with proper layout (short traces, ground plane). Figure 26 in SBOS110B shows <10% overshoot at G = 10 with 1000 pF. For >1000 pF, isolation resistor (10–50 Ω) between output and load is recommended to maintain stability.
How does the OPA2228U/2K5 compare to the OPA2227U/2K5 in terms of noise and bandwidth?
The OPA2228U/2K5 delivers 33 MHz GBW and 11 V/µs slew rate versus the OPA2227U/2K5's 8 MHz GBW and 2.3 V/µs - a 4× speed increase. Both share identical 3 nV/√Hz input voltage noise at 1 kHz and 90 nVP-P 0.1–10 Hz noise. The OPA2228U/2K5 achieves higher speed without sacrificing noise, making it ideal for wideband precision applications where the OPA2227U/2K5 would limit system bandwidth.
Is the OPA2228U/2K5 pin-compatible with legacy OP-37 op-amps?
Yes, the OPA2228U/2K5 is a pin-for-pin replacement for the OP-37 in SOIC-8 and PDIP-8 packages, as confirmed in the SBOS110B datasheet. It improves upon the OP-37 with lower input offset voltage (±75 µV vs ±125 µV), lower noise (3 nV/√Hz vs 4.5 nV/√Hz), and higher slew rate (11 V/µs vs 10 V/µs), while maintaining identical pin functions and supply voltage compatibility.
OPA2228U/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:
- 5 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
OPA2228U/2K5 FAQ
1.How can I place an order for OPA2228U/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2228U/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 OPA2228U/2K5 reliable?
The price and inventory of OPA2228U/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2228U/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2228U/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2228U/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2228U/2K5?
OPA2228U/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2228U/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 OPA2228U/2K5?
For technical support, including OPA2228U/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2228U/2K5 requirements.
6.How does Aetrix verify that OPA2228U/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2228U/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 OPA2228U/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2228U/2K5?
All OPA2228U/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2228U/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 OPA2228U/2K5 part is unused and in its original packaging.
Return procedure for OPA2228U/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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