Texas Instruments OPA2677H/2K5

Overview

OPA2677H/2K5 from Texas Instruments is a dual, wideband current-feedback operational amplifier optimized for high-output-current line driver applications. It delivers 500mA output current, 200MHz bandwidth at G=+4, ±5V output swing into 100Ω, 1800V/µs slew rate, and operates on ±2.5V to ±6V or +5V to +12V supplies - enabling ADSL/VDSL line drivers, broadband video distribution, and high-capacitive-load I/Q channel amplifiers.

For engineers reviewing the OPA2677H/2K5 datasheet, OPA2677H/2K5 pinout, OPA2677H/2K5 application, or OPA2677H/2K5 equivalent, key selection criteria include guaranteed 380mA minimum output current at +25°C, differential gain flatness up to 80MHz (0.1dB), <–85dBc harmonic distortion at ADSL upstream peak power, and thermal performance in HSOP-8 PowerPAD™ package with θ_JA = 55°C/W.

Technical Context

The OPA2677H/2K5 employs a current-feedback architecture with transimpedance gain of 135kΩ (min) and low input impedance (250kΩ || 2pF), enabling bandwidth stability across gains. Its output stage supports symmetrical ±500mA sourcing/sinking with <1V headroom to rails, critical for single-supply +5V or +12V operation in xDSL modems.

It features matched dual channels with –92dB input-referred crosstalk at 5MHz and integrated thermal protection via exposed PowerPAD™ slug - soldered to –VS - ensuring reliable operation under sustained 1W per channel dissipation in HSOP-8 packaging.

Key Specifications

Pinout & Package

OPA2677H/2K5 is packaged in HSOP-8 PowerPAD™ (DDA) with exposed thermal slug requiring connection to –VS plane for rated thermal performance. Pin 1 is marked by dot; pin 8 is –VS; pin 4 and pin 5 are NC; pin 6 is –In B; pin 7 is +In B; pin 2 is –In A; pin 3 is +In A; pin 1 is Out A; pin 8 is –VS; pin 4 is NC; pin 5 is NC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-output-current, wideband operational amplifier applications.

Compared with OPA2677H/2K5, OPA2674IDR trades 120mA output current and 80MHz bandwidth for lower cost and SO-8 compatibility, while THS6042CD provides higher voltage headroom and peak current but lacks single-supply +5V capability and thermal efficiency in HSOP-8.

Availability

OPA2677H/2K5 is available at Aetrix Electronics and suitable for xDSL line cards, cable modem upstream transmitters, broadband video repeaters, and matched I/Q baseband amplifiers requiring stable component supply across extended product lifecycles.

Supply support for OPA2677H/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 leader specializing in analog and embedded processing solutions, with over 50 years of innovation in high-performance op amps and signal chain components.

The OPA2677H/2K5 belongs to TI's high-speed current-feedback op amp product line, engineered specifically for broadband communications infrastructure demanding high output current, low distortion, and robust thermal performance in compact packages.

FAQ

What is the maximum continuous output current specification for OPA2677H/2K5 at +85°C?

The OPA2677H/2K5 guarantees ±320mA minimum continuous output current at +85°C (per Electrical Characteristics table, VS = ±6V). This is measured at VO = 0V with both channels active and represents worst-case thermal derating. At room temperature, it delivers ≥±380mA - sufficient for ADSL Class A compliance. The device also supports ±1.2A peak sourcing and ±1.6A peak sinking for short-duration pulses, provided junction temperature remains below +150°C.

Can OPA2677H/2K5 operate from a single +5V supply, and what output swing is achievable?

Yes, OPA2677H/2K5 is fully specified for single +5V operation (see Electrical Characteristics: VS = +5V). With proper AC-coupled input biasing (e.g., 2.5V midpoint using resistive divider), it delivers ≥3V_PP output swing into 100Ω load while maintaining >100MHz large-signal bandwidth. Output voltage range is 1.0V to 3.5V (min) at +25°C, enabling direct interface to ADCs or downstream analog stages without level-shifting circuitry.

Is the HSOP-8 PowerPAD™ thermal slug on OPA2677H/2K5 required to be connected to a specific net?

Yes - the exposed thermal slug on the OPA2677H/2K5 HSOP-8 package must be soldered directly to the –VS (negative supply) plane on the PCB. TI specifies this connection to achieve the rated θ_JA = 55°C/W. If left floating or connected to GND instead of –VS, thermal resistance degrades to 75°C/W, reducing safe continuous power dissipation by ~27% and risking thermal shutdown under sustained 1W/channel load.

How does OPA2677H/2K5 differ from voltage-feedback op amps in bandwidth behavior?

Unlike voltage-feedback op amps, OPA2677H/2K5 uses current-feedback architecture, meaning its small-signal bandwidth is primarily set by the feedback resistor value (e.g., 402Ω for G=+4), not by closed-loop gain. As a result, bandwidth remains nearly constant from G=+1 (220MHz) to G=+8 (250MHz), whereas voltage-feedback devices typically lose 3dB bandwidth proportionally with increasing gain. This enables consistent high-speed performance across multiple gain configurations in a single design.

What is the recommended layout practice for minimizing crosstalk between channels in OPA2677H/2K5?

To minimize channel-to-channel crosstalk (<–92dB at 5MHz), separate ground vias must be used for each channel's –VS pin (Pin 8) and thermal slug, routed independently to a solid ground plane. Input traces for Channel A (+In A/–In A) and Channel B (+In B/–In B) must be length-matched and shielded by ground guard traces. Avoid shared feedback resistors or common-source impedances; use dedicated 453Ω RF and 113Ω RG per channel in single-supply configurations as shown in TI's Figure 3.