Texas Instruments OPA2658E

Overview

OPA2658E from Texas Instruments (formerly Burr-Brown) is a dual, ultra-wideband, low-power current feedback operational amplifier optimized for high-resolution video, medical imaging, and high-speed signal processing. It delivers 800MHz unity-gain bandwidth, 1700V/µs slew rate, and 0.01%/0.03° differential gain/phase error at ±5V supply, operating in MSOP-8 package with –40°C to +85°C temperature range.

For engineers reviewing the OPA2658E datasheet, OPA2658E pinout, OPA2658E application, or OPA2658E equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts - all grounded in the official OPA2658E datasheet (SBOS046, PDS-1269D).

Technical Context

The OPA2658E implements a current feedback architecture with low-impedance inverting input (≈50Ω) and high-impedance non-inverting input (≈500kΩ || 1pF), enabling superior large-signal bandwidth retention across gains. Its open-loop transimpedance is 150–200kΩ, and it achieves 62° phase margin at unity gain using recommended feedback resistors (560Ω for MSOP-8 in G = +1).

Stability is internally compensated for unity-gain operation; bandwidth scales predictably with gain (e.g., 800MHz at G = +1, 500MHz at G = +2, 210MHz at G = +5), and closed-loop output impedance remains below 0.1Ω up to 10MHz - critical for driving 75Ω/100Ω video loads and flash ADC inputs without external buffering.

Key Specifications

Pinout & Package

OPA2658E is housed in an 8-pin MSOP-8 package (3.0mm × 3.0mm, 0.65mm pitch), optimized for high-density PCB layouts and thermal performance (θ_JA = 150°C/W). Pin numbering follows standard MSOP top-view orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current feedback amplifier applications.

Compared with OPA2658E, OPA2652U trades 2.5× bandwidth and MSOP-8 compactness for slightly better dc precision, while LMH6702MA delivers higher SFDR at the cost of 2.5× quiescent power and no surface-mount footprint compatibility - making OPA2658E optimal for space-constrained, battery-aware, wideband dual-channel systems.

Availability

OPA2658E is available at Aetrix Electronics and suitable for medical imaging systems, high-resolution video infrastructure, and high-speed signal processing equipment requiring stable component supply, guaranteed MSOP-8 sourcing, and long-term industrial temperature support.

Supply support for OPA2658E 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, including high-speed op amps, data converters, and interface ICs for industrial, medical, and communications markets.

The OPA2658E belongs to TI's ultra-wideband current feedback op amp product line, designed specifically for broadcast video, medical imaging, and high-fidelity pulse amplification where bandwidth, slew rate, and differential linearity are non-negotiable.

FAQ

What is the recommended feedback resistor value for OPA2658E in unity-gain configuration?

The OPA2658E requires a 560Ω feedback resistor in unity-gain (G = +1) configuration when packaged in MSOP-8, as specified in the official datasheet (SBOS046, p.3, Note 3). This value ensures optimal Butterworth response and 62° phase margin. Using 402Ω - appropriate for SO-8 - with the OPA2658E will reduce phase margin and risk peaking or instability. Always verify layout parasitics, as board capacitance >2pF may require slight R_FB adjustment.

Does OPA2658E support single-supply operation?

Yes, OPA2658E supports single-supply operation provided common-mode input and output voltage headroom constraints are met. With ±5V nominal supply, the input common-mode range is ±2.9V and output swing is ±2.2V into 100Ω - meaning a +10V single supply can be used if input signals stay within 2.9V of ground and output loads allow ≥2.2V swing above ground. Figure 3 in the SBOS046 datasheet shows a practical single-supply biasing network using resistive dividers and bypass capacitors.

What is the maximum capacitive load OPA2658E can drive without isolation resistor?

The OPA2658E is internally compensated for a nominal 2pF output pin parasitic capacitance. Capacitive loads exceeding 5pF require an isolation resistor (10Ω to 35Ω) in series with the output to maintain stability, as documented in the "Capacitive Loads" section (p.11) of SBOS046. Driving a flash ADC with >10pF input capacitance without R_ISO risks oscillation or gain peaking - verified by the recommended R_ISO vs C_L curve on p.6.

How does OPA2658E's crosstalk performance impact dual-channel designs?

OPA2658E exhibits –78dB input-referred crosstalk at 5MHz (SBOS046, p.2), meaning a full-scale signal on Channel 1 induces <0.04% of its amplitude onto Channel 2's output. This level is sufficient for independent dual-path applications like stereo ultrasound receive chains or I/Q demodulation, but not for ultra-high-isolation requirements such as RF mixer LO/RF port separation. Layout best practices - including separate ground vias and >5mm inter-channel spacing - preserve this spec in production PCBs.

Is OPA2658E pin-compatible with other variants like OPA2658U or OPA2658P?

No, OPA2658E is not pin-compatible with OPA2658U (SO-8) or OPA2658P (DIP) despite identical pin function ordering - because MSOP-8 has 0.65mm pitch versus SO-8's 1.27mm and DIP's 2.54mm. The pinout mapping (1:+VS, 2:Out1, 3:–In1, 4:+In1, 5:+In2, 6:–In2, 7:Out2, 8:–VS) is identical across packages, but physical land patterns, thermal pads, and solder reflow profiles differ significantly. Migration requires PCB redesign, not just footprint swap.