Texas Instruments OPA2677H

Overview

OPA2677H from Texas Instruments is a dual, wideband, high-output-current current-feedback operational amplifier designed for demanding line driver applications. It delivers 500mA output current, 200MHz bandwidth at G = +4, ±5V output swing, 1800V/µs slew rate, and operates on ±2.5V to ±6V or +5V to +12V supplies - enabling ADSL/VDSL, broadband video, and power-line modem driver stages.

For engineers reviewing the OPA2677H datasheet, OPA2677H pinout, OPA2677H application, or OPA2677H equivalent, this page provides verified package mapping (HSOP-8 PowerPAD™), confirmed dual-channel current-feedback architecture, thermal performance data (θ_JA = 55°C/W), distortion specs (–85dBc at ADSL peak power), and real-world load-driving capability (10× 15Ω video loads with <0.1%/0.1° dG/dP).

Technical Context

The OPA2677H uses a current-feedback topology where bandwidth and distortion remain stable across gain settings - unlike voltage-feedback op amps. Its transimpedance gain of 135kΩ (min) and low input impedance (250kΩ || 2pF) enable fast settling and minimal gain-dependent peaking.

It features a thermally enhanced HSOP-8 PowerPAD™ package with exposed slug tied to –V_S, delivering 55°C/W junction-to-ambient thermal resistance. The output stage supports ±500mA continuous current and ±1.6A peak sinking, with rail-to-rail output swing limited to within 1V of either supply under load.

Key Specifications

Pinout & Package

OPA2677H is packaged in an HSOP-8 PowerPAD™ (DDA) with exposed thermal slug requiring connection to –V_S plane for optimal thermal performance. Pin numbering follows standard SO-8 convention with functional duplication across both channels.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2677H, OPA2674 offers reduced thermal load but insufficient current for full-rate VDSL, while THS6042 supports higher voltage swings but cannot operate from +5V - making OPA2677H the sole option meeting simultaneous requirements of +5V compatibility, 500mA drive, and 200MHz bandwidth.

Availability

OPA2677H is available at Aetrix Electronics and suitable for xDSL line cards, broadband video distribution systems, and power-line modem designs requiring stable component supply with guaranteed long-term manufacturability and TI's extended product lifecycle support.

Supply support for OPA2677H 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, embedded processing, and connectivity technologies with over 50 years of precision amplifier innovation.

The OPA2677H belongs to TI's high-speed current-feedback op amp product line, engineered specifically for broadband communications infrastructure where high output current, low distortion, and thermal robustness are non-negotiable.

FAQ

What is the maximum continuous output current specification for the OPA2677H?

The OPA2677H is specified for ±500mA minimum continuous output current at +25°C with ±6V supplies and RL = 100Ω. At elevated temperatures (+85°C), it maintains ±320mA minimum. This rating applies to both channels simultaneously when properly heatsinked via the HSOP-8 PowerPAD™ slug connected to –V_S. Peak sinking current reaches –1.6A, enabling transient-heavy line driver waveforms.

Can the OPA2677H operate from a single +5V supply, and what are the key design constraints?

Yes, the OPA2677H supports single +5V operation with verified performance: 150MHz bandwidth at G = +4, 3V_PP output swing, and >200mA drive into 100Ω. Critical constraints include biasing the noninverting inputs at VS/2 (2.5V) using a resistive divider, AC-coupling the gain-setting network, and maintaining input signal within 1.3V of either rail. The OPA2677H datasheet Figure 3 provides the validated reference circuit.

How does the OPA2677H achieve low harmonic distortion in xDSL applications?

The OPA2677H achieves –85dBc 3rd-harmonic distortion at ADSL upstream peak power through its linear current-feedback output stage, which minimizes crossover distortion during zero-crossing transitions. Combined with precise matching between channels (<–92dB crosstalk) and optimized feedback resistor selection (e.g., 402Ω for G = +4), it meets ITU-T G.992.5 spectral emission limits without external filtering - a key advantage over traditional voltage-feedback amplifiers.

What thermal management practices are required for reliable OPA2677H operation at full output current?

Reliable OPA2677H operation at ±500mA requires soldering the exposed thermal slug (pin 7, –V_S) directly to a solid copper plane connected to the system ground. With this implementation, θ_JA drops to 55°C/W, allowing 1W/channel dissipation at ambient ≤70°C. Without slug connection, θ_JA degrades to 75°C/W, limiting safe continuous output to ~350mA. Thermal vias under the slug (≥6× 0.3mm) are strongly recommended.

Is the OPA2677H pin-compatible with other devices in the OPA267x family, such as the OPA2674 or OPA2691?

No, the OPA2677H is not pin-compatible with OPA2674 or OPA2691. While all three use HSOP-8 packages, OPA2677H (DDA) has unique pin assignments: pins 1/4/5/6/8/10 are NC, whereas OPA2674 uses pin 1 for +In A and OPA2691 assigns pin 1 to –In A. Substituting without PCB revision will cause functional failure. Always verify pinout against SBOS126I Rev. July 2008 for OPA2677H.