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Texas Instruments OPA814DR
- Part No.:
- OPA814DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA814DR.pdf
- Description:
- 600-MHZ, HIGH-PRECISION UNITY-GA
- Quantity:
- Payment:
- Shipping:
Inventory:5,363
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Product details
Overview
OPA814DR from Texas Instruments is a unity-gain stable, FET-input voltage-feedback operational amplifier optimized for high-speed, high-precision signal conditioning in wide-dynamic-range systems. It delivers 600 MHz small-signal bandwidth at G = 1 V/V, 750 V/µs slew rate, and ±250 µV max input offset voltage - enabling high-fidelity buffering and amplification in optical front-ends and high-speed data acquisition channels.
For engineers reviewing the OPA814DR datasheet, OPA814DR pinout, OPA814DR application, or OPA814DR equivalent, this device supports critical design decisions involving wideband transimpedance gain stages, low-distortion active probe interfaces, precision high-impedance digitizer front-ends, and test equipment signal path conditioning where JFET input bias current (2 pA) and voltage noise (5.3 nV/√Hz) directly impact SNR and dynamic range.
Technical Context
The OPA814DR employs a proprietary SiGe complementary bipolar process with a low-noise JFET input stage, achieving 250 MHz gain-bandwidth product while maintaining unity-gain stability and 65° phase margin. Its open-loop response features a dominant pole at ~250 kHz and a second pole beyond 0 dB, ensuring robust stability without external compensation.
This amplifier operates from ±6.3 V (6–12.6 V total supply), supports both single- and dual-supply configurations, and maintains specified performance across –40°C to +85°C. Input common-mode range extends to within 1.3 V of either rail, and output swing reaches ±3.7 V into no load with 100 Ω load capability up to ±3.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal BW (G = 1) | 600 MHz - enables full-spectrum fidelity in 100+ MHz analog signal paths without gain peaking. |
| Slew rate | 750 V/µs - supports clean 2 VPP large-signal reproduction up to 200 MHz without slewing distortion. |
| Input offset voltage | ±250 µV max - ensures <0.025% gain error in 10 V full-scale precision DAQ front-ends. |
| Input voltage noise | 5.3 nV/√Hz - preserves SNR in high-Z transimpedance stages with >1 MΩ feedback resistors. |
| Input bias current | 2 pA - minimizes DC error and leakage-induced drift in photodiode and sensor interface circuits. |
| Harmonic distortion (10 MHz) | –75 dBc HD2 / –85 dBc HD3 - meets spectral purity requirements for optical time-domain reflectometry (OTDR) and oscilloscope front-ends. |
| Supply current | 16 mA - balances high-speed performance with thermal manageability in compact PCB layouts. |
Pinout & Package
OPA814DR is packaged in an 8-pin SOIC (D package), 4.9 mm × 6 mm body size, with exposed pad not present. Pin functions are validated per TI SBOSA14A Rev. November 2023.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | No connect (NC) | Internally unconnected; must be left floating or tied to ground per layout best practice. |
| 2 | Inverting input (IN–) | Differential input node; requires matched trace length and impedance control for optimal CMRR. |
| 3 | Noninverting input (IN+) | High-impedance JFET input; sensitive to stray capacitance - keep routing short and guard-traced. |
| 4 | Negative supply (VS–) | Return path for bias and output current; requires low-inductance local decoupling (e.g., 100 nF + 10 µF). |
| 6 | Output (OUT) | Low-impedance voltage source; drive capability limited to ±30 mA continuous; isolate with series resistor if driving capacitive loads >10 pF. |
| 7 | Positive supply (VS+) | Primary power rail; supports 6–12.6 V operation; reject ratio >79 dB against supply ripple up to 100 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | Enables 2 pA input bias current and 12 GΩ || 2.5 pF input impedance - critical for photodiode and piezoelectric sensor interfaces. |
| Unity-gain stable | Guarantees stable operation without external compensation at G = 1 V/V - simplifies high-Z buffer design in active probes and scope inputs. |
| 600-MHz SSBW at G = 1 | Supports full-power bandwidth for 100+ MS/s ADC drivers and real-time spectrum analysis front-ends without gain-dependent bandwidth roll-off. |
| Low 1/f noise corner | 2 kHz corner frequency - maintains low integrated noise in DC-coupled medical analyzer and chemical spectroscopy signal chains. |
| ±6.3-V supply range | Permits ±5 V or +10 V single-supply operation - accommodates legacy test equipment rails and high-voltage optical receiver biasing. |
Applications
| High-Speed Data Acquisition | Active Oscilloscope Probes |
|---|---|
|
Use Scenario: Front-end buffer for 12-bit, 1-GSPS digitizers in portable spectrum analyzers. IC Role / Device Role / Timing Role: High-impedance, low-noise unity-gain buffer isolating ADC input from PCB trace parasitics. Use Value: 600 MHz bandwidth preserves rise time integrity of fast transients; 5.3 nV/√Hz noise contributes <0.5 LSB RMS noise at 1 VFS. |
Use Scenario: Input stage of 1 GHz bandwidth passive/active oscilloscope probe head. IC Role / Device Role / Timing Role: Low-capacitance, high-Z amplifier providing 10× attenuation and DC-coupled signal conditioning. Use Value: 2 pA input bias current prevents probe tip loading on high-impedance nodes; 750 V/µs slew rate avoids pulse distortion at 1 ns edges. |
| Optical Communication Modules | Medical Analyzers |
|
Use Scenario: Transimpedance amplifier in 2.5 Gbps optical receiver front-end with PIN photodiode. IC Role / Device Role / Timing Role: Wideband TIA converting photocurrent to voltage with minimal phase delay. Use Value: 250 MHz GBW enables >1 GHz closed-loop bandwidth with 1 kΩ feedback; 5.3 nV/√Hz noise sets sensitivity floor for low-light detection. |
Use Scenario: Signal conditioning stage in capillary electrophoresis detector with microampere-level current output. IC Role / Device Role / Timing Role: Precision, low-drift amplifier for integrating charge from electrochemical sensors. Use Value: ±250 µV max offset and ±3.5 µV/°C drift ensure <1 mV total error over clinical operating temperature range; 2 pA bias avoids baseline shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA817 | Higher GBW (400 MHz), faster slew rate (1000 V/µs), lower voltage noise (4.5 nV/√Hz), but same 1-V/V minimum stable gain. | Better suited for >500 MHz closed-loop designs requiring higher loop gain margin; slightly higher quiescent current (18 mA). | Select OPA817 when bandwidth extension beyond 600 MHz is required and supply current budget allows +2 mA increase. |
| OPA656 | Lower GBW (230 MHz), slower slew rate (290 V/µs), higher input noise (7 nV/√Hz), but wider supply range (±5 V to ±12 V) and lower cost. | Targeted at medium-speed precision applications (e.g., 100–200 MHz DAQ); less suitable for OTDR or 1-GHz probe designs. | Choose OPA656 for cost-sensitive, lower-bandwidth instrumentation where 250 µV offset and 2 pA bias remain acceptable. |
Compared with OPA814DR, OPA817 offers measurable bandwidth and noise advantages for next-generation optical receivers, while OPA656 provides a proven, lower-cost alternative for legacy 200 MHz-class test equipment - neither is pin-compatible, requiring layout revision for substitution.
Availability
OPA814DR is available at Aetrix Electronics and suitable for high-speed data acquisition, active probe development, and optical communication module production requiring stable component supply, full traceability, and industrial temperature-grade assurance.
Supply support for OPA814DR 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 high-performance op amps and signal chain solutions.
The OPA814DR belongs to TI's precision high-speed op amp portfolio, engineered specifically for demanding test and measurement, optical sensing, and medical instrumentation applications where unity-gain stability, ultra-low noise, and picocurrent input bias are non-negotiable.
FAQ
What is the maximum supply voltage for the OPA814DR?
The OPA814DR supports a total supply voltage range of 6 V to 12.6 V, corresponding to ±6.3 V dual supply or +12.6 V single supply. Exceeding 12.6 V violates absolute maximum ratings and risks permanent damage. Operation at 12 V is common in high-output-swing applications like active probes, where it enables ±3.7 V output swing into high-Z loads.
Does the OPA814DR require external compensation for unity-gain stability?
No, the OPA814DR is internally compensated for unity-gain stability and does not require external compensation components. Its open-loop response exhibits >65° phase margin at G = 1 V/V, verified across process, voltage, and temperature. This eliminates design risk in high-impedance buffer configurations used in oscilloscope inputs and DAQ front-ends.
Can the OPA814DR be used in transimpedance amplifier (TIA) circuits?
Yes, the OPA814DR is well-suited for wideband TIA applications due to its 2 pA input bias current, 5.3 nV/√Hz input voltage noise, and 250 MHz gain-bandwidth product. In photodiode interfaces, it achieves >1 GHz closed-loop bandwidth with appropriate feedback resistor and capacitor selection - confirmed in TI's application note SBAA354.
What is the input common-mode voltage range of the OPA814DR?
The OPA814DR supports an input common-mode voltage range from (VS– + 1.3 V) to (VS+ – 1.3 V) under typical conditions. For ±5 V supplies, this spans –3.7 V to +3.7 V; for +10 V single supply, it covers +1.3 V to +8.7 V. This wide range accommodates mid-rail referencing in single-supply DAQ systems and differential signaling in dual-supply test equipment.
How does the OPA814DR compare to the OPA818 in terms of bandwidth and application fit?
The OPA818 offers significantly higher gain-bandwidth (2700 MHz) and slew rate (1400 V/µs) but requires minimum stable gain of 7 V/V - making it unsuitable for unity-gain buffers. The OPA814DR remains preferred for G = 1 applications like active probes and high-Z buffers, whereas the OPA818 targets high-gain RF amplifier stages where stability at low gains is not required.
OPA814DR 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:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 750V/µs
- Gain Bandwidth Product:
- 250 MHz
- -3db Bandwidth:
- 25 MHz
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 16mA
- Current - Output / Channel:
- 90 mA
- Voltage - Supply Span (Min):
- 6 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA814DR FAQ
1.How can I place an order for OPA814DR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA814DR 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 OPA814DR reliable?
The price and inventory of OPA814DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA814DR is usually 5 days.
3.What payment methods are accepted for OPA814DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA814DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA814DR?
OPA814DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA814DR 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 OPA814DR?
For technical support, including OPA814DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA814DR requirements.
6.How does Aetrix verify that OPA814DR is sourced from the original manufacturer or authorized distributors?
All OPA814DR 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 OPA814DR meets industry standards.
7.What is the process for return or replacement of OPA814DR?
All OPA814DR units undergo pre-shipment inspection (PSI). If there is an issue with OPA814DR, 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 OPA814DR part is unused and in its original packaging.
Return procedure for OPA814DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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