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Texas Instruments OPA4228UA
- Part No.:
- OPA4228UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4228UA.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:235
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Product details
Overview
OPA4228UA from Texas Instruments is a quad, 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. It operates from ±2.5 V to ±18 V supplies and is used in spectral analysis instrumentation requiring simultaneous high AC fidelity and DC stability.
For engineers reviewing the OPA4228UA datasheet, OPA4228UA pinout, OPA4228UA application, or OPA4228UA equivalent, key selection criteria include its 33 MHz bandwidth, 11 V/µs slew rate, 3 nV/√Hz noise floor, ±75 µV max input offset voltage, and SO-14 package compatibility with space-constrained multichannel signal conditioning designs.
Technical Context
The OPA4228UA implements a fully compensated, bipolar-input op-amp architecture optimized for stable operation at closed-loop gains of 5 V/V or higher. Its internal compensation eliminates need for external capacitors while enabling 33 MHz unity-gain-stable bandwidth only when configured per recommended gain constraints.
It features matched input bias current (±10 nA max), 138 dB CMRR, 160 dB open-loop gain, and rail-to-rail output swing capability limited by ±2 V headroom at ±15 V supply - all specified across –40°C to +85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 33 MHz - enables stable amplification of signals up to ~6.6 MHz at G = 5, critical for wideband sensor front-ends. |
| Slew Rate | 11 V/µs - supports fast transient response in active filter stages without distortion at 10 Vpp outputs. |
| Input Voltage Noise | 3 nV/√Hz @ 1 kHz - ensures minimal contribution to system noise floor in low-level signal chains like geophysical sensors. |
| Input Offset Voltage | ±75 µV max - guarantees <0.00075% error in 10 V full-scale precision measurement paths. |
| CMRR | 138 dB - rejects >79 million:1 common-mode interference, essential in noisy industrial power supply monitoring. |
| Supply Range | ±2.5 V to ±18 V - allows direct interfacing with legacy ±15 V systems or low-power ±5 V portable instrumentation. |
| Operating Temperature | –40°C to +85°C - qualified for deployment in telecom base station analog front-ends and outdoor spectral analyzers. |
Pinout & Package
OPA4228UA is housed in a 14-pin SOIC (SO-14) package measuring 8.65 mm × 3.91 mm, with standard quad op-amp pinout compatible with industry layout practices and thermal management requirements for multi-amplifier PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Out A) | Output channel A | Amplified signal output for first op-amp; requires local 0.1 µF decoupling to ground for stability. |
| 2 (–In A) | Inverting input channel A | Differential input node; sensitive to layout symmetry and guard ringing to minimize noise coupling. |
| 3 (+In A) | Noninverting input channel A | High-impedance input (10⁹ Ω || 3 pF); must avoid parasitic capacitance to preserve 33 MHz bandwidth. |
| 4 (V+) | Positive supply rail | Connects to highest potential supply; requires dedicated 0.1 µF ceramic capacitor to ground near pin. |
| 5 (+In B) | Noninverting input channel B | Second independent input; shares no internal nodes with Channel A - enables true isolated dual-path design. |
| 6 (–In B) | Inverting input channel B | Matched to Pin 2; differential pair matching supports <0.2 µV/V channel separation up to 100 kHz. |
| 7 (Out B) | Output channel B | Independent output; capable of driving 600 Ω loads to ±3.5 V with <0.00005% THD+N at 1 kHz. |
| 8 (Out C) | Output channel C | Third output; identical AC/DC specs to Out A/B - enables 3-channel active filtering without inter-channel crosstalk. |
| 9 (–In C) | Inverting input channel C | Third inverting input; pin-compatible with dual variants but adds channel density without footprint increase. |
| 10 (+In C) | Noninverting input channel C | Third noninverting input; supports independent gain-setting resistors per channel for mixed-sensitivity sensor arrays. |
| 11 (V–) | Negative supply rail | Connects to lowest potential supply; must be routed with equal impedance to V+ for PSRR optimization. |
| 12 (+In D) | Noninverting input channel D | Fourth input; enables full quad-channel synchronous acquisition in vibration analysis systems. |
| 13 (–In D) | Inverting input channel D | Fourth inverting input; completes quad configuration with matched offset drift (<±0.6 µV/°C) across all channels. |
| 14 (Out D) | Output channel D | Final output; delivers same 11 V/µs slew rate and 33 MHz GBW as other channels - no performance trade-off for integration. |
Key Features
| Feature | Design Value |
|---|---|
| Low 1/f noise corner | 10 Hz - maintains flat 3 nV/√Hz noise density down to audio band, critical for DC-coupled seismic sensors. |
| High-speed settling | 1.5 µs to 0.1% at G = 5 - enables 1 MSPS multichannel data acquisition with guaranteed accuracy. |
| Thermal drift control | ±0.6 µV/°C max dVOS/dT - limits offset drift to <50 µV over full –40°C to +85°C range, reducing calibration frequency. |
| Robust ESD protection | ±2000 V HBM - survives handling in uncontrolled assembly environments without latch-up or parameter shift. |
| Channel isolation | 110 dB @ 1 kHz - prevents crosstalk between adjacent channels in 4-channel active filter banks. |
Applications
| Professional Audio Equipment | Spectral Analysis |
|---|---|
Use Scenario: Low-distortion microphone preamplification and analog summing in studio-grade mixing consoles. IC Role / Device Role / Timing Role: Quad-channel precision gain stage with matched noise and THD+N performance across all four channels. Use Value: Delivers 0.00005% THD+N at 1 kHz and 3.5 Vrms output, preserving harmonic integrity in high-fidelity signal paths. | Use Scenario: Simultaneous multi-band FFT processing front-end in portable spectrum analyzers. IC Role / Device Role / Timing Role: Four independent, phase-matched amplifier channels for parallel analog bandpass filtering before ADC sampling. Use Value: 33 MHz GBW and 11 V/µs slew rate support accurate reconstruction of signals up to 6.6 MHz at G = 5. |
| Geophysical Analysis | Vibration Analysis |
Use Scenario: Seismometer signal conditioning where sub-µV-level signals require ultra-low-noise amplification. IC Role / Device Role / Timing Role: First-stage low-noise amplifier with 3 nV/√Hz voltage noise and 0.1 Hz to 10 Hz integrated noise of 15 nVrms. Use Value: Enables detection of microseismic events below 20 nV amplitude in field-deployed instrumentation. | Use Scenario: Multi-axis accelerometer signal conditioning in predictive maintenance systems monitoring rotating machinery. IC Role / Device Role / Timing Role: Quad-channel synchronized gain block for X/Y/Z + reference axis signals with matched offset and drift. Use Value: ±75 µV max offset and ±0.6 µV/°C drift ensure consistent amplitude scaling across axes over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, low-noise operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4227UA | Unity-gain stable; 8 MHz GBW, 2.3 V/µs slew rate, same 3 nV/√Hz noise and ±75 µV offset. | Better suited for G = 1–2 active filters and DC-coupled integrators where stability at low gain is required. | Select OPA4227UA when circuit topology demands unity-gain stability or lower bandwidth suffices. |
| AD8676ARUZ | Rail-to-rail output; 10 MHz GBW, 2.5 V/µs slew rate, 2.8 nV/√Hz noise, ±12.5 µV offset (typ), SO-8 package. | Optimized for single-supply, low-voltage systems; lacks quad SO-14 footprint and 33 MHz bandwidth. | Choose AD8676ARUZ for battery-powered, single-supply precision applications where quad channel count is secondary. |
Compared with OPA4227UA and AD8676ARUZ, the OPA4228UA uniquely delivers 33 MHz bandwidth and 11 V/µs slew rate in a quad SO-14 package - enabling high-speed, multi-channel signal conditioning without sacrificing DC precision or noise performance.
Availability
OPA4228UA is available at Aetrix Electronics and suitable for professional audio equipment, spectral analysis instruments, geophysical sensing platforms, and vibration monitoring systems requiring stable component supply across extended production lifecycles.
Supply support for OPA4228UA 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPAx22x product line was designed specifically for applications demanding simultaneous high AC bandwidth and precision DC performance - bridging the gap between general-purpose and ultra-high-end op-amps in test & measurement, instrumentation, and industrial sensing.
FAQ
What is the minimum closed-loop gain required for stable operation of the OPA4228UA?
The OPA4228UA is optimized for stable operation at closed-loop gains of 5 V/V or greater. Operating below G = 5 may cause peaking or instability due to its internal compensation tailored for higher gain configurations. For unity-gain or G = 2 applications, the pin-compatible OPA4227UA is the recommended alternative. The OPA4228UA datasheet explicitly specifies "Minimum Closed-Loop Gain: 5 V/V" under Electrical Characteristics.
Does the OPA4228UA support rail-to-rail output swing?
No, the OPA4228UA does not provide rail-to-rail output. Its output voltage swing is specified as (V–)+2 V to (V+)-2 V at 10 kΩ load and (V–)+3.5 V to (V+)-3.5 V at 600 Ω load. This 2–3.5 V headroom requirement means it cannot drive signals within 2 V of either supply rail. For true rail-to-rail output, consider alternatives like the AD8676 series - but note they lack the OPA4228UA's 33 MHz bandwidth and quad SO-14 form factor.
What is the maximum capacitive load the OPA4228UA can drive without compensation?
The OPA4228UA can safely drive up to 100 pF without external compensation, as verified in typical characteristics (Figure 26). Driving >100 pF - such as long cables or high-C ADC inputs - requires a series resistor (typically 20–100 Ω) between the OPA4228UA output and the load to maintain phase margin. The device's open-loop output impedance is 27 Ω at 1 MHz, making it susceptible to instability with purely capacitive loads above its rated limit.
How does the OPA4228UA's noise performance compare between 0.1 Hz–10 Hz and 1 kHz?
The OPA4228UA exhibits 15 nVrms integrated input voltage noise over 0.1 Hz–10 Hz and maintains a flat 3 nV/√Hz spectral density at 1 kHz. This indicates a low 1/f noise corner (~10 Hz), meaning its low-frequency noise is dominated by flicker effects but transitions to white noise behavior above 10 Hz. This profile makes it suitable for both DC-coupled precision measurements (where 0.1–10 Hz noise matters) and wideband AC applications (where 1 kHz density dominates).
Is the OPA4228UA pin-compatible with older industry-standard op-amps?
Yes, the OPA4228UA in SO-14 package is a pin-for-pin replacement for the industry-standard OP-37 quad variant (e.g., OP437) and LT1037-based quads, as confirmed in the TI datasheet SBOS110B. It provides substantial improvements in bandwidth (33 MHz vs. 63 MHz for OP-37, but with better DC specs), slew rate (11 V/µs vs. 17 V/µs), and noise (3 nV/√Hz vs. 3.5 nV/√Hz), while maintaining identical pin functions and layout compatibility for drop-in upgrades in legacy designs.
OPA4228UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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 (x4 Channels)
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -55°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA4228UA FAQ
1.How can I place an order for OPA4228UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4228UA 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 OPA4228UA reliable?
The price and inventory of OPA4228UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4228UA is usually 5 days.
3.What payment methods are accepted for OPA4228UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4228UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4228UA?
OPA4228UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4228UA 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 OPA4228UA?
For technical support, including OPA4228UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4228UA requirements.
6.How does Aetrix verify that OPA4228UA is sourced from the original manufacturer or authorized distributors?
All OPA4228UA 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 OPA4228UA meets industry standards.
7.What is the process for return or replacement of OPA4228UA?
All OPA4228UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA4228UA, 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 OPA4228UA part is unused and in its original packaging.
Return procedure for OPA4228UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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