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Texas Instruments OPA656NB/250
- Part No.:
- OPA656NB/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA656NB/250.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,284
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Product details
Overview
OPA656NB/250 from Texas Instruments is a unity-gain stable, FET-input voltage-feedback operational amplifier optimized for ultra-low-noise transimpedance and high-speed data acquisition front-ends. It delivers 550MHz unity-gain bandwidth, 6nV/√Hz input voltage noise, and ±2pA input bias current, enabling precision optical signal conditioning in photodiode-based OTDR and oscilloscope front-ends.
For engineers reviewing the OPA656NB/250 datasheet, OPA656NB/250 pinout, OPA656NB/250 application, or OPA656NB/250 equivalent, key selection criteria include its JFET-input DC precision (±600μV max VOS), wideband stability at G = 1, low distortion (–100dBc HD3 @ 5MHz), and SOIC-8 packaging with industrial temperature support (–40°C to +85°C).
Technical Context
The OPA656NB/250 employs a high-speed complementary bipolar process with a low-noise JFET input stage, delivering unity-gain stability without external compensation. Its 230MHz gain-bandwidth product and 150MHz large-signal bandwidth (2VPP) support high-fidelity signal buffering and transimpedance amplification up to ~4MHz with 100kΩ feedback.
It operates from ±4V to ±6V supplies (8V–12V total), features 80–95dB CMRR, and maintains <±6μV/°C offset drift over temperature. Input impedance exceeds 1TΩ || 0.4pF common-mode and 10GΩ || 2.6pF differential, making it suitable for high-Z sensor interfaces where leakage and noise coupling must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-gain bandwidth | 550MHz - enables stable G = 1 operation with full small-signal response up to UHF range |
| Gain-bandwidth product | 230MHz - supports broadband closed-loop gains ≥10 V/V with predictable frequency roll-off |
| Input voltage noise | 6nV/√Hz - minimizes integrated noise in transimpedance applications with high RF values |
| Input bias current | ±2pA (max) - preserves signal integrity in high-impedance photodiode and probe front-ends |
| Input offset voltage | ±600μV (max) - ensures sub-mV DC accuracy in precision optical measurement systems |
| Supply voltage range | ±4V to ±6V (8V–12V total) - compatible with standard dual-rail lab and test equipment rails |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade instrumentation and field-deployable test gear |
Pinout & Package
OPA656NB/250 is supplied in an 8-pin SOIC (D package), 4.9mm × 6mm body size, with exposed pad not present. Pin functions are validated per TI SBOS196I Rev. FEBRUARY 2024.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | No connect (NC) | Internally unconnected; must remain floating or grounded per layout best practice |
| 2 | Inverting input (VIN–) | High-impedance node for feedback network connection in transimpedance or inverting configurations |
| 3 | Noninverting input (VIN+) | DC-bias reference point; typically grounded or set via high-value resistor for offset control |
| 4 | Negative supply (–VS) | Return path for negative rail; requires local 0.1μF + 6.8μF decoupling per TI layout guidelines |
| 6 | Output (VOUT) | Capable of ±3.5V swing into 100Ω; drives 50Ω test loads directly with minimal matching components |
| 7 | Positive supply (+VS) | Power entry for positive rail; decoupling identical to –VS required for stability and noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable architecture | Eliminates need for external compensation in G = 1 buffer or photodiode TIA configurations |
| JFET input stage | Enables >1TΩ input impedance and sub-pA bias current for minimal photodiode loading |
| Low harmonic distortion | –100dBc HD3 at 5MHz (RL = 200Ω, VO = 2VPP) supports clean signal digitization in DAQ front-ends |
| High DC precision grade | OPA656NB variant specifies tighter VOS (±600μV max) and drift (±6μV/°C max) vs standard OPA656 |
| Industrial temperature rating | Validated operation from –40°C to +85°C ensures reliability in benchtop and field-deployed test equipment |
Applications
| Optical Time-Domain Reflectometry (OTDR) | Oscilloscope Front-End Amplifier |
|---|---|
Use Scenario: Detecting weak backscattered light pulses from fiber optic cables over distances up to 100 km. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode current to high-bandwidth voltage signal with minimal added noise. Use Value: 6nV/√Hz input voltage noise and 550MHz bandwidth enable detection of sub-nanosecond pulses with >70dB dynamic range. |
Use Scenario: Signal conditioning stage before ADC in real-time digital storage oscilloscopes with ≥1GHz sampling. IC Role / Device Role / Timing Role: Unity-gain buffer isolating probe tip from scope input capacitance while preserving rise time fidelity. Use Value: 150MHz large-signal bandwidth (2VPP) and 1.3ns rise/fall time ensure <1% amplitude error on 500ps edges. |
| Active High-Impedance Probes | Medical Laser Pulse Detection |
Use Scenario: 10× passive/active probes requiring ultra-low input capacitance and high DC input resistance. IC Role / Device Role / Timing Role: Input-stage amplifier with >1TΩ || 0.4pF input impedance driving coaxial cable to scope input. Use Value: ±2pA input bias current prevents DC offset shift during long-duration biomedical waveform capture. |
Use Scenario: Converting pulsed photocurrent from laser diode monitoring photodiodes in surgical and diagnostic systems. IC Role / Device Role / Timing Role: Low-noise, fast-settling transimpedance amplifier for sub-μs pulse timing and energy quantification. Use Value: 19ns settling to 0.02% (2V step) and –80dBc HD2 at 5MHz ensure accurate pulse shape reconstruction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA814IDBVT | Higher GBW (250MHz), faster slew rate (750V/μs), lower voltage noise (5.3nV/√Hz), but same ±2pA IB | Better suited for higher-gain (>+5V/V) or faster edge-rate (>1V/ns) applications; less optimal for unity-gain TIA due to higher noise floor at low frequencies | Select OPA814IDBVT when gain ≥5 V/V and bandwidth >200MHz is required; retain OPA656NB/250 for G = 1–2, low-noise photodiode interfaces |
| OPA659IDBVR | Higher GBW (350MHz), much higher slew rate (2550V/μs), but higher voltage noise (8.9nV/√Hz) and minimum stable gain = 1 V/V | Targeted at high-speed ADC drivers and composite video; not recommended for precision transimpedance due to elevated noise | Choose OPA659IDBVR only for high-slew, medium-noise applications like fast pulse amplification; avoid for optical sensing where 6nV/√Hz is critical |
Compared with OPA814IDBVT and OPA659IDBVR, the OPA656NB/250 uniquely balances ultra-low input voltage noise, unity-gain stability, and tight DC specifications-making it the preferred choice for photodiode transimpedance and precision test equipment front-ends where noise and DC accuracy dominate over raw speed.
Availability
OPA656NB/250 is available at Aetrix Electronics and suitable for high-speed data acquisition, optical time-domain reflectometry, and oscilloscope front-end designs requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA656NB/250 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 precision signal chain solutions.
The OPA656NB/250 belongs to TI's OPA high-speed precision op-amp family, engineered specifically for transimpedance amplification, optical test equipment, and high-fidelity data acquisition front-ends demanding low noise, wide bandwidth, and industrial-grade reliability.
FAQ
What is the maximum supply voltage for the OPA656NB/250?
The OPA656NB/250 has an absolute maximum supply voltage of ±6.5V (13V total), but its recommended operating range is ±4V to ±6V (8V–12V total). Operation beyond ±6V risks exceeding safe junction temperature and degrading long-term reliability. The OPA656NB/250 is fully specified and characterized at ±5V, and all key parameters-including bandwidth, noise, and distortion-are guaranteed within this range.
Is the OPA656NB/250 pin-compatible with other variants in the OPA656 family?
Yes-the OPA656NB/250 shares identical pinout, package (SOIC-8), and electrical interface with all OPA656 variants (e.g., OPA656U, OPA656UB, OPA656N). The "NB" suffix denotes the high-grade DC specification version (tighter VOS and drift), but mechanical and functional compatibility is maintained across the family. No PCB redesign is needed when upgrading from standard OPA656 to OPA656NB/250.
Can the OPA656NB/250 be used in single-supply applications?
Yes-the OPA656NB/250 supports single-supply operation when the input common-mode voltage and output swing remain within its specified rails. For example, with +Vs = 10V and –Vs = 0V, the input common-mode range extends from –3.7V to +2.75V (relative to ground), and output swing reaches ±3.5V into 100Ω. However, optimal performance-including full bandwidth and lowest distortion-is achieved under symmetric dual-supply conditions (e.g., ±5V).
How does the OPA656NB/250 differ from the standard OPA656 in terms of DC specifications?
The OPA656NB/250 is the high-grade DC version: it guarantees input offset voltage ≤ ±600μV (vs ±1.8mV for standard OPA656) and offset drift ≤ ±6μV/°C (vs ±12μV/°C). These tighter limits are verified across the full –40°C to +85°C range and make the OPA656NB/250 suitable for applications where baseline accuracy and thermal stability are critical-such as calibrated medical analyzers and metrology-grade test equipment.
What layout practices are essential for achieving specified performance with the OPA656NB/250?
To achieve the OPA656NB/250's rated 550MHz bandwidth and low distortion, TI mandates strict layout rules: use short, direct traces for VIN+, VIN–, and VOUT; place 0.1μF ceramic + 6.8μF tantalum decoupling capacitors within 2mm of each supply pin; remove ground/power planes under the input node to minimize parasitic capacitance; and isolate the feedback path from noisy traces. Failure to follow these practices results in peaking, instability, or degraded noise performance.
OPA656NB/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 295V/µs
- Gain Bandwidth Product:
- 230 MHz
- -3db Bandwidth:
- 500 MHz
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 14mA
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA656NB/250 FAQ
1.How can I place an order for OPA656NB/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA656NB/250 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 OPA656NB/250 reliable?
The price and inventory of OPA656NB/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA656NB/250 is usually 5 days.
3.What payment methods are accepted for OPA656NB/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA656NB/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA656NB/250?
OPA656NB/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA656NB/250 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 OPA656NB/250?
For technical support, including OPA656NB/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA656NB/250 requirements.
6.How does Aetrix verify that OPA656NB/250 is sourced from the original manufacturer or authorized distributors?
All OPA656NB/250 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 OPA656NB/250 meets industry standards.
7.What is the process for return or replacement of OPA656NB/250?
All OPA656NB/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA656NB/250, 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 OPA656NB/250 part is unused and in its original packaging.
Return procedure for OPA656NB/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA656NB/250 Tags
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