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Texas Instruments OPA686N/250
- Part No.:
- OPA686N/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA686N/250.pdf
- Description:
- IC OPAMP VFB 1.6GHZ SGL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,050
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Product details
Overview
OPA686N/250 from Texas Instruments (formerly Burr-Brown) is a wideband, low-noise, voltage-feedback operational amplifier optimized for high-dynamic-range signal conditioning. It delivers 250MHz bandwidth at G = +10, 1.3nV/√Hz input voltage noise, 600V/µs slew rate, and –90dBc 2nd-harmonic distortion at 5MHz into 500Ω - enabling precision ADC preamplification, ultrasound channel amplification, and VDSL line reception.
For engineers reviewing the OPA686N/250 datasheet, OPA686N/250 pinout, OPA686N/250 application, or OPA686N/250 equivalent, key selection criteria include gain stability ≥7, ±5V dual-supply operation, SOT-23-5 package thermal resistance (150°C/W), and verified transimpedance performance with photodiode interfaces up to 23MHz flat bandwidth.
Technical Context
The OPA686N/250 employs a classical differential input stage followed by two forward-gain stages and a high-power output stage, delivering exceptional linearity and DC accuracy. Its voltage-feedback architecture supports standard op-amp configurations while maintaining stability down to noise gain +7.
It achieves 1600MHz gain-bandwidth product and uses external compensation (e.g., CS/CF network) to enable stable low-gain (G = –2) operation with improved SFDR - demonstrated at 170MHz –3dB bandwidth and >5dB harmonic distortion reduction at 20MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Closed-loop bandwidth (G = +10) | 250 MHz min - ensures full-swing signal fidelity up to 200mVp-p at 5MHz without clipping or phase error. |
| Input voltage noise density | 1.3 nV/√Hz max - dominates total input-referred noise in transimpedance designs with <100pF source capacitance. |
| Slew rate | 600 V/µs min - enables clean 2V step response in ≤1.4ns, critical for fast-settling ADC driver applications. |
| Harmonic distortion (2nd, 5MHz) | –90 dBc max into 500Ω - meets 14-bit ADC SNR requirements when driving matched loads. |
| Gain-bandwidth product | 1600 MHz min - allows stable high-gain (>+40) amplification or ultra-low-distortion wideband gain-of-ten operation. |
| Supply current | 12.4 mA typ at +25°C - tightly trimmed for predictable power budgeting across temperature (±0.9mA variation from –40°C to +85°C). |
| Common-mode input range | ±2.8 V min at +85°C - supports rail-to-rail input signal swing within ±5V supply constraints. |
Pinout & Package
OPA686N/250 is housed in a 5-pin SOT-23-5 surface-mount package (JEDEC MO-178AA), with θJA = 150°C/W and marking code "A86". Pin 1 is identified by a beveled corner or dot; device orientation follows standard SOT-23 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Output) | Amplified signal output | Capable of sourcing/sinking ±50mA into 100Ω load; requires local 0.1µF decoupling to ground. |
| 2 (–VS) | Negative supply connection | Must be connected to –5V (or –6V max); not internally tied to substrate - floating violates absolute max ratings. |
| 3 (Non-Inverting Input) | Positive input node | High-impedance (2.9MΩ || 1pF) node; grounding eliminates non-inverting input current noise contribution in IF amplifier configs. |
| 4 (+VS) | Positive supply connection | Must be connected to +5V (or +6V max); shared decoupling with –VS improves PSRR above 100kHz. |
| 5 (Inverting Input) | Negative input node | Differential-mode impedance 6kΩ || 2pF; used as transimpedance summing junction or matched 50Ω termination point. |
Key Features
| Feature | Design Value |
|---|---|
| Stable for noise gains ≥7 | Enables fixed-gain +10 configurations without external compensation while preserving 250MHz bandwidth. |
| Low input voltage noise (1.3nV/√Hz) | Reduces total input-referred noise in photodiode transimpedance stages where diode capacitance dominates noise gain. |
| High slew rate (600V/µs) | Supports full-scale 2Vp-p output steps with ≤18ns 0.01% settling - essential for 12–14-bit ADC input drivers. |
| External low-gain compensation support | Allows G = –2 operation with 170MHz flat bandwidth and >5dB 2nd-harmonic improvement via CS/CF network. |
| Tightly trimmed quiescent current | 12.4mA ±0.5mA at +25°C enables accurate thermal modeling and consistent bias point across production lots. |
Applications
| High-Dynamic-Range ADC Preamplifier | Ultrasound Channel Amplifier |
|---|---|
Use Scenario: Driving the analog input of a 14-bit, 80MSPS pipeline ADC in medical imaging front-end. IC Role / Device Role / Timing Role: Final-stage gain block with 10× voltage amplification and anti-alias filtering interface. Use Value: 250MHz bandwidth and –90dBc distortion preserve ENOB >12.5 bits; 1.3nV/√Hz noise ensures SNR ≥75dB at 5MHz. | Use Scenario: Signal conditioning per-channel analog path in portable ultrasound beamformer ASICs. IC Role / Device Role / Timing Role: Time-gain-controlled (TGC) variable-gain amplifier before ADC sampling. Use Value: 600V/µs slew rate supports fast TGC ramping; 1600MHz GBP enables programmable gain without bandwidth collapse. |
| VDSL Line Receiver | Low-Noise Differential Receiver |
Use Scenario: Downstream signal recovery in Category 3 twisted-pair VDSL modems operating up to 30MHz. IC Role / Device Role / Timing Role: Single-ended to differential converter and broadband baseband amplifier. Use Value: 250MHz G=+10 bandwidth captures full VDSL spectrum; CMRR >85dB minimizes echo leakage in hybrid circuits. | Use Scenario: Instrumentation-grade differential signal acquisition from bridge sensors or RF mixers. IC Role / Device Role / Timing Role: Precision difference amplifier with matched gain and phase response. Use Value: 0.02% differential gain/0.02° differential phase error preserves video and composite signal integrity at NTSC frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband, low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2686 | Dual-channel version; identical 1.3nV/√Hz noise and 1600MHz GBP but higher 24mA total supply current. | Requires PCB real estate for second amplifier; advantageous only when dual-path signal chains exist. | Select OPA2686 only if dual-channel functionality is required - no pin compatibility with OPA686N/250. |
| OPA687 | Lower 0.95nV/√Hz noise and higher 3600MHz GBP, but unstable below G = +15 and consumes 16mA. | Not suitable for G = +10 or transimpedance use without complex compensation; better for ≥+20 fixed-gain stages. | Choose OPA687 only for ultra-low-noise, high-gain (>+15) applications where layout complexity and power are secondary. |
Compared with OPA2686 and OPA687, the OPA686N/250 uniquely balances 250MHz bandwidth at G=+10, guaranteed stability down to G=+7, and 12.4mA power - making it the optimal choice for cost-sensitive, single-channel, high-fidelity ADC driver and transimpedance designs.
Availability
OPA686N/250 is available at Aetrix Electronics and suitable for high-speed data acquisition, medical ultrasound front-ends, and broadband communications infrastructure requiring stable component supply and traceable lot history.
Supply support for OPA686N/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 acquired Burr-Brown in 2000 and maintains its precision analog portfolio with rigorous process control and long-term product commitment.
The OPA686N/250 belongs to TI's high-speed voltage-feedback op amp family, designed specifically for wideband signal chain applications demanding low noise, high linearity, and robust DC accuracy in compact SOT-23 packaging.
FAQ
What is the minimum stable gain for OPA686N/250, and does it require external compensation at G = +10?
The OPA686N/250 is guaranteed stable for noise gains ≥+7. At G = +10 (noise gain = 11), no external compensation is required - the device achieves 250MHz closed-loop bandwidth with <2dB peaking. This makes OPA686N/250 ideal for fixed-gain ADC driver applications without added passive components.
Can OPA686N/250 operate from a single +10V supply instead of ±5V?
No - the OPA686N/250 is specified only for dual-supply operation (±5V typical, ±6V absolute max). Its input common-mode range extends to ±2.8V at +85°C, and output swing is asymmetric under single-supply bias. Using +10V/0V violates the ±6.5V absolute maximum supply rating and risks latch-up or parametric failure.
What is the thermal resistance (θJA) of the OPA686N/250 in its SOT-23-5 package?
The OPA686N/250 has a junction-to-ambient thermal resistance (θJA) of 150°C/W in the 5-pin SOT-23-5 package (JEDEC MO-178AA), measured on a standard 2-layer FR-4 board with no copper pour. With 1-inch² 2oz copper pad under the exposed pad (if present), θJA improves to ~65°C/W - but the OPA686N/250 lacks an exposed thermal pad.
How does OPA686N/250 compare to CLC425 as a replacement?
The OPA686N/250 is explicitly positioned as an improved replacement for the CLC425, offering 2.5× higher gain-bandwidth (1600MHz vs 650MHz), 40% lower input voltage noise (1.3nV/√Hz vs 2.1nV/√Hz), and superior harmonic distortion (–90dBc vs –75dBc at 5MHz). Unlike the CLC425, OPA686N/250 guarantees stability down to G = +7.
Is SPICE modeling support available for OPA686N/250, and what limitations apply?
Yes - a validated SPICE macro model for OPA686N/250 is available from Texas Instruments' website and supports accurate small-signal AC and transient simulation. However, the model does not replicate harmonic distortion behavior or package-specific parasitics, and does not distinguish between SO-8 and SOT-23-5 variants in AC response.
OPA686N/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SpeedPlus™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 600V/µs
- Gain Bandwidth Product:
- 1.6 GHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 µA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 12.4mA
- Current - Output / Channel:
- 80 mA
- Voltage - Supply Span (Min):
- 9 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
OPA686N/250 FAQ
1.How can I place an order for OPA686N/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA686N/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 OPA686N/250 reliable?
The price and inventory of OPA686N/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA686N/250 is usually 5 days.
3.What payment methods are accepted for OPA686N/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA686N/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA686N/250?
OPA686N/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA686N/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 OPA686N/250?
For technical support, including OPA686N/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA686N/250 requirements.
6.How does Aetrix verify that OPA686N/250 is sourced from the original manufacturer or authorized distributors?
All OPA686N/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 OPA686N/250 meets industry standards.
7.What is the process for return or replacement of OPA686N/250?
All OPA686N/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA686N/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 OPA686N/250 part is unused and in its original packaging.
Return procedure for OPA686N/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA686N/250 Tags
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