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Texas Instruments OPA4228UA/2K5G4
- Part No.:
- OPA4228UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4228UA/2K5G4.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,526
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Product details
Overview
OPA4228UA/2K5G4 from Texas Instruments is a quad-channel, high-precision, low-noise operational amplifier optimized for closed-loop gains ≥5, delivering 33 MHz unity-gain bandwidth, 10 V/µs slew rate, and 3 nV/√Hz input voltage noise density at 1 kHz. It operates from ±2.25 V to ±18 V supplies and supports professional audio amplification, spectrum analysis, and precision data acquisition systems.
For engineers reviewing the OPA4228UA/2K5G4 datasheet, OPA4228UA/2K5G4 pinout, OPA4228UA/2K5G4 application, or OPA4228UA/2K5G4 equivalent, key selection criteria include closed-loop gain stability requirement, 33 MHz bandwidth vs. 8 MHz (OPA4227), 10 V/µs slew rate, 138 dB CMRR, and SO-14 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The OPA4228UA/2K5G4 implements a compensated bipolar input stage optimized for minimum phase shift and stable operation at closed-loop gains of 5 V/V or higher-unlike the unity-gain-stable OPA4227. Its internal compensation enables fast settling (1.5 µs to 0.1%) and low distortion (0.00005% THD+N at 1 kHz) in high-speed precision signal conditioning paths.
It features matched quad-channel architecture with >120 dB channel separation up to 100 kHz, rail-to-rail output swing capability (±13.5 V into 10 kΩ at ±15 V supply), and robust ESD protection (1000 V HBM, 250 V CDM), making it suitable for multi-channel sensor front-ends and instrumentation-grade analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 33 MHz unity-gain bandwidth - enables accurate amplification of signals up to ~10 MHz with minimal gain error in G ≥ 5 configurations. |
| Slew Rate | 10 V/µs - supports full-scale 10-V step response within 1 µs, critical for fast-settling data acquisition and pulse amplification. |
| Input Voltage Noise | 3 nV/√Hz at 1 kHz - ensures minimal added noise in low-level signal amplification (e.g., microphone preamps, strain gauge interfaces). |
| CMRR | 138 dB - rejects common-mode interference from noisy power rails or shared ground paths in multi-stage analog systems. |
| Offset Voltage | ±75 µV max (U grade) - maintains dc accuracy in precision gain stages without frequent calibration, even over –40°C to +85°C. |
| Supply Range | ±2.25 V to ±18 V - accommodates both low-voltage portable designs and high-dynamic-range industrial systems. |
| Quiescent Current | 3.8 mA per amplifier - balances speed and power efficiency for multi-channel applications where thermal density matters. |
Pinout & Package
OPA4228UA/2K5G4 is supplied in a 14-pin SOIC (SO-14) package with standard quad op-amp pin configuration and surface-mount footprint (5.0 mm × 8.65 mm, 1.27 mm pitch). Thermal resistance RθJA = 65 °C/W enables reliable operation at full rated load under natural convection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives external load; capable of ±13.5 V swing into 10 kΩ at ±15 V supply. |
| 2 | –In A | Inverting input for channel A - forms feedback node in inverting configurations; high-impedance (1 GΩ || 3 pF). |
| 3 | +In A | Noninverting input for channel A - connects to reference or sensor; common-mode range extends to (V–)+2 V and (V+)-2 V. |
| 4 | V+ | Positive supply rail - must be decoupled with 0.1 µF ceramic capacitor near pin for high-frequency stability. |
| 5 | +In B | Noninverting input for channel B - electrically isolated from other channels; supports independent biasing. |
| 6 | –In B | Inverting input for channel B - matches channel A performance; enables dual differential input stages. |
| 7 | Out B | Amplifier B output - fully independent; channel separation >120 dB prevents crosstalk in multi-channel filtering. |
| 8 | Out C | Amplifier C output - identical specs to Out A/B; allows three simultaneous signal paths without external buffering. |
| 9 | –In C | Inverting input for channel C - supports cascaded gain stages or active filter topologies requiring multiple integrators. |
| 10 | +In C | Noninverting input for channel C - enables parallel sensor inputs (e.g., 4-wire RTD excitation and sensing). |
| 11 | V– | Negative supply rail - referenced to system ground in single-supply use; requires local 0.1 µF decoupling. |
| 12 | +In D | Noninverting input for channel D - completes quad functionality; supports 4-channel programmable gain amplifier (PGA) designs. |
| 13 | –In D | Inverting input for channel D - matches input impedance and noise profile of other channels. |
| 14 | Out D | Amplifier D output - enables full 4-channel analog signal processing on one IC, reducing board area and interconnect noise. |
Key Features
| Feature | Design Value |
|---|---|
| Closed-loop gain optimization | Stable at G ≥ 5 - eliminates need for external compensation in high-speed inverting/noninverting amplifiers. |
| Low 1/f noise corner | 90 nVPP (0.1–10 Hz) - preserves signal integrity in dc-coupled sensor interfaces like thermocouple amplifiers. |
| High open-loop gain | 160 dB - ensures <0.001% gain error in precision instrumentation amplifiers using moderate feedback ratios. |
| Input bias current | ±10 nA max - minimizes voltage error across high-impedance sources (e.g., pH electrodes, piezoelectric sensors). |
| Output short-circuit protection | ±45 mA continuous - prevents latch-up during transient overloads in motor control or actuator driver circuits. |
Applications
| Professional Audio Signal Chain | Spectrum Analyzer Front-End |
|---|---|
Use Scenario: Rack-mount audio preamplifier with 4-channel balanced input stage and variable gain control. IC Role / Device Role / Timing Role: Quad OPA4228UA/2K5G4 provides simultaneous low-noise amplification, DC-coupled level shifting, and anti-alias filtering for stereo L/R plus auxiliary channels. Use Value: 3 nV/√Hz noise floor and 138 dB CMRR preserve dynamic range and channel separation in high-fidelity recording systems. | Use Scenario: Real-time RF signal digitization path with 100-MHz bandwidth analog front-end and programmable gain. IC Role / Device Role / Timing Role: Four independent OPA4228UA/2K5G4 channels condition IF signals before ADC sampling, each configured as G=10 bandpass amplifier. Use Value: 33 MHz GBW and 10 V/µs slew rate enable accurate reproduction of fast-rising spectral components without phase distortion. |
| Precision Data Acquisition System | Industrial Condition Monitoring Sensor Hub |
Use Scenario: 16-bit, 1 MSPS DAQ module acquiring voltage, current, and temperature from 4 industrial sensors simultaneously. IC Role / Device Role / Timing Role: OPA4228UA/2K5G4 serves as configurable gain stage and anti-alias filter driver for SAR ADC inputs. Use Value: ±75 µV offset and 0.6 µV/°C drift ensure <0.01% measurement error across –40°C to +85°C ambient without per-channel calibration. | Use Scenario: Vibration and temperature monitoring node deployed on rotating machinery with limited PCB space. IC Role / Device Role / Timing Role: Single OPA4228UA/2K5G4 processes accelerometer, gyroscope, thermistor, and current-sense outputs in parallel. Use Value: Quad integration reduces component count by 75% vs. discrete op-amps, lowering assembly cost and improving channel-to-channel timing alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4227UA/2K5 | Unity-gain stable; 8 MHz GBW, 2.3 V/µs slew rate, same noise and offset specs. | Suitable for G = 1–4 configurations (e.g., buffers, integrators); not recommended for G ≥ 5 high-speed amplifiers. | Select OPA4227UA/2K5 only when unity-gain stability is required and bandwidth ≤8 MHz suffices. |
| AD8676ARZ-REEL | Single-supply capable (2.7–36 V), lower quiescent current (2.3 mA), but narrower 10 MHz GBW and higher 4.8 nV/√Hz noise. | Better for battery-powered precision instruments; less suitable for wideband AC-coupled signal chains above 5 MHz. | Choose AD8676ARZ-REEL when single-supply operation or ultra-low power dominates over bandwidth and noise performance. |
Compared with OPA4227UA/2K5 and AD8676ARZ-REEL, the OPA4228UA/2K5G4 uniquely delivers 33 MHz bandwidth with 3 nV/√Hz noise in a quad SO-14 package-enabling high-fidelity, multi-channel signal conditioning where speed, noise, and integration density are jointly critical.
Availability
OPA4228UA/2K5G4 is available at Aetrix Electronics and suitable for professional audio equipment, spectrum analyzers, precision data acquisition systems, and industrial condition monitoring sensors requiring stable component supply and guaranteed long-term manufacturability.
Supply support for OPA4228UA/2K5G4 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 op-amp design and manufacturing.
The OPAx228 product line was engineered specifically for high-speed, high-accuracy analog signal chains in test & measurement, professional audio, and industrial instrumentation-balancing bandwidth, noise, and dc precision in a single platform.
FAQ
What is the minimum closed-loop gain required for stable operation of the OPA4228UA/2K5G4?
The OPA4228UA/2K5G4 is internally compensated for stable operation at closed-loop gains of 5 V/V or greater. Using it at gains below 5 may cause peaking or oscillation due to insufficient phase margin. For unity-gain or G = 2–4 applications, the pin-compatible OPA4227UA/2K5 is the recommended alternative.
Does the OPA4228UA/2K5G4 support single-supply operation?
Yes, the OPA4228UA/2K5G4 supports single-supply operation from 4.5 V to 36 V (as specified in Recommended Operating Conditions). Its input common-mode range extends to (V–)+2 V and (V+)-2 V, and output swings to within 2 V of each rail-enabling use in 5 V, 12 V, or 24 V systems with appropriate level-shifting.
What is the thermal performance of the OPA4228UA/2K5G4 in SO-14 package?
The OPA4228UA/2K5G4 in SO-14 package has a junction-to-ambient thermal resistance (RθJA) of 65 °C/W under standard JEDEC PCB conditions. At maximum quiescent current (3.8 mA per amplifier × 4 = 15.2 mA) and ±15 V supply, total power dissipation is ~456 mW, resulting in ~30°C junction rise above ambient-well within safe operating limits at +85°C ambient.
How does the OPA4228UA/2K5G4 compare to the industry-standard OP37 in terms of noise and speed?
The OPA4228UA/2K5G4 improves upon the OP37 with 3 nV/√Hz input voltage noise (vs. 3.5 nV/√Hz for OP37) and 33 MHz bandwidth (vs. 63 MHz for OP37, but with higher distortion). More critically, OPA4228UA/2K5G4 offers superior dc precision: ±75 µV offset (vs. ±125 µV for OP37) and 138 dB CMRR (vs. 110 dB), making it better suited for mixed-signal applications demanding both ac fidelity and dc accuracy.
Can the OPA4228UA/2K5G4 drive capacitive loads directly?
The OPA4228UA/2K5G4 can drive moderate capacitive loads (≤100 pF) without external isolation, as confirmed by typical overshoot data in Figure 6-31. For loads >100 pF, a series resistor (10–50 Ω) between output and capacitance is recommended to maintain phase margin and prevent ringing-especially in high-gain configurations.
OPA4228UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/2K5G4 FAQ
1.How can I place an order for OPA4228UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4228UA/2K5G4 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/2K5G4 reliable?
The price and inventory of OPA4228UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4228UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA4228UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4228UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4228UA/2K5G4?
OPA4228UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4228UA/2K5G4 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/2K5G4?
For technical support, including OPA4228UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4228UA/2K5G4 requirements.
6.How does Aetrix verify that OPA4228UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA4228UA/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA4228UA/2K5G4?
All OPA4228UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4228UA/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for OPA4228UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA4228UA/2K5G4 Tags
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