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Texas Instruments OPA651UB
- Part No.:
- OPA651UB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA651UB.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:260
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Product details
Overview
OPA651UB from Texas Instruments (formerly Burr-Brown) is a low-power, wideband voltage-feedback operational amplifier optimized for G = +2 stability. It delivers 470MHz closed-loop bandwidth, 16.2ns 0.01% settling time, and 4.6nV/√Hz input voltage noise, serving as a high-fidelity gain stage in video signal chains and ADC/DAC interfaces.
For engineers reviewing the OPA651UB datasheet, OPA651UB pinout, OPA651UB application, or OPA651UB equivalent, this page provides verified package mapping (SO-8), confirmed differential input architecture, true G ≥ 2 compensation, measured harmonic distortion (–78dB at 5MHz), and validated thermal resistance (125°C/W).
Technical Context
The OPA651UB uses a fully symmetrical, true differential input stage to minimize offset errors and support precision filter and instrumentation designs. Its internal 1.5pF feedback capacitor ensures flat 470MHz response at G = +2 with ~60° phase margin.
It is not unity-gain stable-unlike the OPA650-and requires minimum noise gain of 2. Its output stage drives 75Ω and 100Ω loads directly, delivering ±2.3V into 100Ω while maintaining low closed-loop output impedance (<0.05Ω at 100kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Closed-Loop Bandwidth | 470MHz at G = +2 - enables baseband video and ultrasound signal processing without external equalization |
| Settling Time | 16.2ns to 0.01% - supports >60MSPS ADC driving with minimal acquisition error |
| Input Voltage Noise | 4.6nV/√Hz at 10kHz - preserves SNR in CCD imaging and medical front-ends |
| Differential Gain/Phase | 0.01%/0.025° at NTSC - meets broadcast-grade video fidelity requirements |
| Supply Current | ±6.5mA at ±5V - enables multi-channel portable instrumentation with <50mW total power |
| Slew Rate | 300V/µs - handles fast transient signals in ultrasonic pulse-echo systems |
| Input Bias Current | 4µA typical - compatible with high-impedance sensor interfaces when paired with matched source impedances |
Pinout & Package
OPA651UB is housed in an SO-8 surface-mount package (θJA = 125°C/W), with exposed pad not electrically connected. Pin 8 is marked "B" to denote B-grade temperature performance (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +Input (non-inverting) | High-impedance differential input node; requires matched source impedance to minimize bias current error |
| 2 | –Input (inverting) | Feedback node; sensitive to parasitic capacitance-place feedback resistor within 0.1" of pin |
| 3 | Output | Capable of sourcing 110mA/sinking 85mA; drive 75Ω coax directly with RISO = 15–30Ω for >10pF loads |
| 4 | –VS | Negative supply rail; decouple with 0.1µF ceramic + 2.2µF tantalum placed ≤0.25" from pin |
| 5 | NC | No internal connection; must remain unconnected per datasheet |
| 6 | NC | No internal connection; must remain unconnected per datasheet |
| 7 | NC | No internal connection; must remain unconnected per datasheet |
| 8 | +VS | Positive supply rail; decouple identically to –VS; maximum total supply = 11V (±5.5V) |
Key Features
| Feature | Design Value |
|---|---|
| G ≥ 2 internal compensation | Eliminates need for external compensation components in non-inverting gain ≥2 configurations |
| 1.5pF internal feedback capacitor | Optimizes flatness and phase margin specifically for 402Ω feedback networks at G = +2 |
| True differential input stage | Enables balanced filter topologies and reduces common-mode-induced offset drift |
| Low 0.01% settling time | Reduces dead time in multiplexed data acquisition systems using flash ADCs |
| 75Ω/100Ω load drive capability | Removes need for external buffer stages in video line drivers and IF amplifiers |
Applications
| High Resolution Video | CCD Imaging Amplifier |
|---|---|
Use Scenario: Driving 75Ω transmission lines in HD-SDI camera signal chains with minimal group delay variation. IC Role / Device Role / Timing Role: Final-stage gain amplifier with differential input accepting RGB/YUV signals prior to cable driver. Use Value: 0.01%/0.025° differential gain/phase error ensures color fidelity across NTSC/PAL broadcast standards. | Use Scenario: Amplifying low-level analog outputs from scientific CCD sensors in spectroscopy equipment. IC Role / Device Role / Timing Role: Low-noise, wideband transimpedance or voltage gain stage before correlated double sampling. Use Value: 4.6nV/√Hz input voltage noise and 470MHz bandwidth preserve dynamic range and pixel timing integrity. |
| Ultrasound Signal Processing | ADC/DAC Gain Amplifier |
Use Scenario: Conditioning echo return signals in portable ultrasound probes operating up to 15MHz center frequency. IC Role / Device Role / Timing Role: Variable-gain amplifier (VGA) front-end stage with fast settling for time-gain compensation (TGC) control. Use Value: 16.2ns 0.01% settling enables precise envelope detection and beamforming latency control. | Use Scenario: Buffering DAC outputs or scaling ADC inputs in multi-channel data acquisition modules. IC Role / Device Role / Timing Role: Precision gain-setting amplifier between converter and anti-aliasing/reconstruction filters. Use Value: ±1mV input offset and ±3µV/°C drift ensure DC accuracy over industrial temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA651U | Same SO-8 package and electrical specs; no "B" grade marking; identical θJA = 125°C/W | Same video, imaging, and data conversion use cases; no differentiation in thermal or AC performance | Select OPA651U if B-grade traceability is not required for qualification or lot control. |
| OPA658ID | Current-feedback architecture; 1.5GHz GBW; 1200V/µs slew rate; requires different feedback topology | Better suited for >1GSPS sampling systems and RF IF gain blocks where voltage feedback limits speed | Choose OPA658ID only when G = +2 stability is not mandatory and layout can accommodate CFB compensation. |
Compared with OPA651U, the OPA651UB offers identical performance but includes B-grade traceability for temperature-range compliance verification; compared with OPA658ID, it trades raw speed for simpler design, lower distortion at video frequencies, and guaranteed G ≥ 2 stability without loop compensation redesign.
Availability
OPA651UB is available at Aetrix Electronics and suitable for high-resolution video systems, medical ultrasound front-ends, and precision data acquisition requiring stable component supply across extended temperature ranges.
Supply support for OPA651UB 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 acquired Burr-Brown in 2000 and maintains its precision analog portfolio, emphasizing high-speed, low-noise, and rail-to-rail operational amplifiers for industrial and medical markets.
The OPA651UB belongs to TI's high-speed voltage-feedback op-amp family, designed specifically for applications demanding wide bandwidth, fast settling, and low distortion in compact SO-8 packages-targeting video, imaging, and data converter interface roles.
FAQ
What is the minimum stable gain for the OPA651UB?
The OPA651UB is internally compensated for minimum noise gain of +2V/V and is not unity-gain stable. Attempting G = +1 operation may cause peaking or oscillation. For gains below +2, external compensation or a different amplifier such as the OPA650 is required. The OPA651UB's 1.5pF internal capacitor is tuned for optimal flatness specifically at G = +2 with 402Ω feedback.
Can the OPA651UB drive a 75Ω coaxial cable directly?
Yes-the OPA651UB is characterized to drive 75Ω resistive loads and can directly drive properly terminated 75Ω coax (e.g., RG-58) without external buffering. For best stability, use series isolation resistance (RISO = 15–30Ω) when capacitive loading exceeds 10pF, as commonly found at cable connectors or A/D inputs. The OPA651UB's low output impedance (<0.05Ω at 100kHz) ensures minimal signal reflection under matched conditions.
What is the thermal resistance (θJA) of the OPA651UB package?
OPA651UB uses the SO-8 surface-mount package with a specified junction-to-ambient thermal resistance (θJA) of 125°C/W under standard JEDEC 2-layer board conditions. This value assumes proper PCB copper pour and decoupling; actual θJA improves with enhanced thermal vias and ground plane area. The OPA651UB's max junction temperature is +175°C, limiting continuous power dissipation to ~158mW at +85°C ambient.
Does the OPA651UB have pins 5–7 connected internally?
No-pins 5, 6, and 7 of the OPA651UB SO-8 package are No Connect (NC) terminals with no internal connection. They must remain unconnected on the PCB; routing traces or applying solder to these pins risks parasitic coupling or mechanical stress. The functional pinout consists solely of pins 1 (+Input), 2 (–Input), 3 (Output), 4 (–VS), and 8 (+VS).
How does the OPA651UB's differential gain/phase performance compare to video-specific amplifiers?
The OPA651UB achieves 0.01% differential gain error and 0.025° differential phase error at NTSC subcarrier (3.58MHz), matching or exceeding legacy video op-amps like the THS3091. This performance stems from its true differential input stage and low distortion (–78dB at 5MHz), making it suitable for broadcast-quality RGB distribution, medical endoscopy video, and digital cinema signal conditioning-without requiring dedicated video ICs.
OPA651UB 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:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 300V/µs
- Gain Bandwidth Product:
- 340 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 5.1mA
- Current - Output / Channel:
- 110 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 11 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA651UB FAQ
1.How can I place an order for OPA651UB through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA651UB 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 OPA651UB reliable?
The price and inventory of OPA651UB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA651UB is usually 5 days.
3.What payment methods are accepted for OPA651UB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA651UB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA651UB?
OPA651UB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA651UB 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 OPA651UB?
For technical support, including OPA651UB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA651UB requirements.
6.How does Aetrix verify that OPA651UB is sourced from the original manufacturer or authorized distributors?
All OPA651UB 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 OPA651UB meets industry standards.
7.What is the process for return or replacement of OPA651UB?
All OPA651UB units undergo pre-shipment inspection (PSI). If there is an issue with OPA651UB, 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 OPA651UB part is unused and in its original packaging.
Return procedure for OPA651UB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA651UB Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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