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Texas Instruments OPA2677U/2K5
- Part No.:
- OPA2677U/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2677U/2K5.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,449
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Product details
Overview
OPA2677U/2K5 from Texas Instruments is a dual, wideband current-feedback operational amplifier designed for high-output-current line driver applications. It delivers 500mA output current, 200MHz bandwidth at G=+4, ±5V output swing on ±6V supplies, and 1800V/µs slew rate-enabling xDSL, cable modem, and broadband video signal amplification with low harmonic distortion.
For engineers reviewing the OPA2677U/2K5 datasheet, OPA2677U/2K5 pinout, OPA2677U/2K5 application, or OPA2677U/2K5 equivalent, key selection criteria include output current capability under capacitive load, gain-flatness bandwidth at G=+4, differential distortion performance in I/Q channels, thermal resistance of SO-8 package, and single-supply operation down to +5V.
Technical Context
The OPA2677U/2K5 employs a current-feedback architecture where bandwidth and distortion are largely independent of closed-loop gain. Its transimpedance gain exceeds 135kΩ, and it maintains stable operation with feedback resistors as low as 250Ω across gains from +1 to +8.
Designed for demanding line driver roles, it supports both DC-coupled bipolar (±2.5V to ±6V) and AC-coupled single-supply (+5V to +12V) configurations. Input common-mode range extends to ±4.5V, and output can swing within 1V of either rail while sourcing/sinking >380mA at room temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +4) | 200MHz - enables full-rate VDSL and ADSL upstream signal amplification without gain-dependent bandwidth loss |
| Output Current (min) | ±380mA at +25°C - meets minimum ADSL CPE line driver requirement with margin for temperature derating |
| Slew Rate (min) | 1400V/µs - supports fast transient response for composite video and multi-tone power line modem signals |
| Harmonic Distortion (2nd, RL = 100Ω) | –68dBc at 5MHz - ensures < –85dBc upstream distortion compliance in full-rate ADSL systems |
| Supply Range | +5V to +12V single or ±2.5V to ±6V dual - allows flexible integration into legacy and new DSLAM/CPE designs |
| Quiescent Current (both ch) | 18mA max at ±6V - balances high drive capability with thermal management in dense PCB layouts |
| Input Voltage Noise | 2nV/√Hz typ above 1MHz - preserves SNR in wideband receiver front-end buffering stages |
Pinout & Package
The OPA2677U/2K5 is packaged in an SO-8 (D package) with exposed pad not present; thermal resistance θJA = 125°C/W. Pin functions are validated per TI SBOS126I Rev. July 2008.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input B | Current-summing node for Channel B; requires matched layout to minimize crosstalk and phase error in I/Q pairs |
| 2 | Noninverting Input B | High-impedance input (250kΩ || 2pF); bias current ≤ ±35µA limits resistor-based DC offset errors |
| 3 | Output B | Capable of ±500mA drive into 25Ω loads; requires local 0.1µF decoupling and thermal relief for SO-8 |
| 4 | –VS | Power return for both channels; must be low-inductance path to ground plane to prevent oscillation |
| 5 | –In A | Inverting input for Channel A; identical electrical behavior to Pin 1, enabling matched dual-channel design |
| 6 | +In A | Noninverting input for Channel A; same CMIR (±4.5V) and noise specs as Pin 2 |
| 7 | Output A | Independent high-current output; channel-to-channel crosstalk ≤ –92dB at 5MHz supports tight I/Q isolation |
| 8 | +VS | Positive supply rail; accepts up to +12.6V; requires separate 0.1µF + 6.8µF decoupling per channel |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable | 220MHz bandwidth at G = +1 - eliminates need for external compensation in unity-gain buffer or active filter stages |
| High output current | ±500mA continuous - drives 15Ω video loads in parallel or 100Ω twisted-pair lines without external boost transistors |
| Low distortion at high frequency | < –85dBc 3rd-harmonic at 5MHz, RL ≥ 500Ω - meets stringent spectral mask requirements for DOCSIS 3.1 cable upstream |
| Flexible supply operation | Operates from +5V single supply or ±6V dual - simplifies power architecture in mixed-signal DSL modems and ARB line drivers |
| Thermal-enhanced SO-8 | θJA = 125°C/W - enables 1.2A peak sourcing without heatsink in ambient ≤ +70°C with 2-layer board |
Applications
| xDSL Line Driver | Cable Modem Driver |
|---|---|
Use Scenario: Full-rate ADSL2+ line card driving 100m twisted-pair loop with >380mA peak current demand. IC Role / Device Role / Timing Role: Final-stage current-boosting amplifier delivering upstream signal to POTS splitter interface. Use Value: Delivers –85dBc distortion at peak upstream power levels while maintaining >200MHz small-signal bandwidth for echo cancellation. | Use Scenario: DOCSIS 3.1 upstream transmitter driving 75Ω coaxial cable with multi-tone OFDM signals. IC Role / Device Role / Timing Role: High-linearity, wideband driver stage preceding RF upconversion and power amplification. Use Value: Achieves < –70dBc 2nd/3rd harmonic at 5MHz with 2VPP output into 100Ω, meeting DOCSIS spectral purity requirements. |
| Matched I/Q Channel Amplifier | Broadband Video Line Driver |
Use Scenario: Quadrature demodulator output buffering in software-defined radio baseband processing. IC Role / Device Role / Timing Role: Dual-channel, phase-matched gain block preserving I/Q orthogonality across 100MHz bandwidth. Use Value: Channel-to-channel crosstalk ≤ –92dB at 5MHz and < 0.04° differential phase error ensure EVM < 1% at 64-QAM. | Use Scenario: SDI/HDMI repeater driving 10 parallel 15Ω video loads over long traces. IC Role / Device Role / Timing Role: Composite video distribution amplifier with dG/dφ < 0.05%/0.04° at NTSC frequencies. Use Value: Sustains < 0.1%/0.1° nonlinearity while delivering 5VPP into 150Ω, supporting broadcast-grade video fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband, high-output-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS6042ID | ±15V capable, lower bandwidth (150MHz @ G=+2), higher quiescent current (24mA) | Targeted at industrial instrumentation requiring wider supply range, not optimized for ADSL CPE thermal constraints | Choose THS6042ID only when ±15V rails are mandatory and bandwidth < 150MHz suffices |
| OPA2691U | Single-channel, 220MHz bandwidth, 350mA output current, lower distortion (–93dBc 3rd-harmonic) | Requires two devices for dual-channel use; better suited for precision test equipment than cost-sensitive CPE line cards | Select OPA2691U when ultra-low distortion outweighs dual-channel integration and board space savings |
Compared with THS6042ID and OPA2691U, the OPA2677U/2K5 uniquely combines dual-channel integration, 500mA drive, and ADSL-optimized thermal performance in SO-8 - making it the most space- and power-efficient solution for xDSL and broadband line driver applications.
Availability
OPA2677U/2K5 is available at Aetrix Electronics and suitable for xDSL line driver, cable modem upstream amplifier, and broadband video distribution applications requiring stable component supply, consistent parametric performance across temperature, and long-term production continuity.
Supply support for OPA2677U/2K5 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 company specializing in analog and embedded processing technologies, with leadership in high-performance op amps and signal chain solutions.
The OPA2677U/2K5 belongs to TI's high-speed current-feedback op amp product line, engineered specifically for broadband communications infrastructure requiring high output current, low distortion, and robust thermal performance in compact packages.
FAQ
What is the maximum safe operating voltage for the OPA2677U/2K5?
The absolute maximum supply voltage for the OPA2677U/2K5 is ±6.5V DC per the TI SBOS126I datasheet. Operation beyond ±6.3V (maximum specified operating voltage) risks permanent damage. For reliable long-term use, TI specifies ±6V as the recommended maximum operating condition, especially under full output current load where junction temperature must remain below +150°C.
Does the OPA2677U/2K5 support single-supply operation?
Yes, the OPA2677U/2K5 supports true single-supply operation from +5V to +12V. At +5V, it delivers >100MHz bandwidth with 2VPP output into 100Ω and maintains >300mA output current. The input common-mode range extends to 1.3V above ground and 3.7V below VS, enabling AC-coupled configurations with simple resistive biasing - as verified in Figure 3 of the SBOS126I datasheet.
What is the thermal resistance (θJA) of the OPA2677U/2K5 in its SO-8 package?
The OPA2677U/2K5 in SO-8 (package D) has a typical junction-to-ambient thermal resistance (θJA) of 125°C/W, as specified in the Thermal Characteristics table of SBOS126I. This value assumes standard JEDEC 2-layer board conditions; no exposed thermal pad is present in the SO-8 variant, so no soldering of slug is required or possible.
Can the OPA2677U/2K5 drive capacitive loads without instability?
The OPA2677U/2K5 can drive moderate capacitive loads but requires series output resistance (RS) for stability. Per Figure 7 and related text in SBOS126I, RS = 40Ω is recommended for 100pF loads, increasing to 90Ω for 1000pF. Without RS, oscillation may occur due to phase shift introduced by the load capacitance interacting with the amplifier's current-feedback topology.
Is the OPA2677U/2K5 pin-compatible with other TI dual op amps like the OPA2674?
No, the OPA2677U/2K5 is not pin-compatible with the OPA2674 or other TI dual op amps. Its SO-8 pinout (In–B, In+B, OutB, –VS, In–A, In+A, OutA, +VS) differs from standard voltage-feedback dual op amp layouts. Substitution would require PCB redesign; the OPA2674 uses different internal architecture (voltage-feedback) and lacks the OPA2677U/2K5's 500mA output capability and current-feedback bandwidth characteristics.
OPA2677U/2K5 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:
- Current Feedback
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 2000V/µs
- Gain Bandwidth Product:
- 2 GHz
- -3db Bandwidth:
- 250 MHz
- Current - Input Bias:
- 10 µA
- Voltage - Input Offset:
- 800 µV
- Current - Supply:
- 18mA (x2 Channels)
- Current - Output / Channel:
- 500 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2677U/2K5 FAQ
1.How can I place an order for OPA2677U/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2677U/2K5 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 OPA2677U/2K5 reliable?
The price and inventory of OPA2677U/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2677U/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2677U/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2677U/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2677U/2K5?
OPA2677U/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2677U/2K5 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 OPA2677U/2K5?
For technical support, including OPA2677U/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2677U/2K5 requirements.
6.How does Aetrix verify that OPA2677U/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2677U/2K5 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 OPA2677U/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2677U/2K5?
All OPA2677U/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2677U/2K5, 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 OPA2677U/2K5 part is unused and in its original packaging.
Return procedure for OPA2677U/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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