OPA355UA - 200MHz CMOS Op Amp with Shutdown | Texas Instruments
料号： OPA355UA ✓ 量产中OPA355UA 概述
An operational amplifier is an active analog signal-processing component that amplifies the voltage difference between two inputs while using negative feedback to control gain, bandwidth, and output behavior. The OPA355 belongs to the CMOS operational-amplifier family and sits within the broader hierarchy of signal-chain ICs, analog ICs, and semiconductor devices. Its wide bandwidth makes it useful when signals must be amplified without severe attenuation, particularly in video, communications, instrumentation, and mixed-signal systems.
The 200 MHz gain-bandwidth product is the amplifier's principal headline specification. For a closed-loop amplifier, this value indicates the approximate bandwidth available at unity gain and helps determine how quickly the circuit can respond to changing input signals. Unity-gain stability permits direct use as a buffer, while the rail-to-rail input and output characteristics broaden the usable signal range relative to fixed-headroom implementations. A dedicated shutdown connection can reduce power consumption when the amplifier is not needed.
OPA355UA uses a voltage-feedback CMOS architecture intended for high-speed, low-voltage analog systems. As a voltage-feedback amplifier, its closed-loop response is governed by external feedback components, allowing the same device to implement inverting, non-inverting, summing, and filtering circuits. The manufacturer identifies the series as suitable for video and other wide-bandwidth applications and notes that the amplifier is unity-gain stable and capable of driving large output currents.
Typical uses include video signal conditioning, high-speed analog filtering, test and measurement front ends, communications interfaces, ADC or DAC driver stages, and precision control loops. Its 2.5 V capability and compact 8-pin SOIC package are especially useful in portable equipment and mixed-signal designs where board area and power budget are constrained. The shutdown feature also supports systems that periodically disable unused analog channels.
Circuit design must account for high-speed stability, output loading, input common-mode range, supply bypassing, and the behavior of the shutdown control. Place the bypass capacitor close to the supply pins, keep feedback-loop traces short, and provide a low-impedance reference return. When driving capacitive loads or driving a downstream converter, evaluate output stability and slew-rate requirements rather than relying only on gain-bandwidth product.
This product overview combines the manufacturer identification, package information, public technical characteristics, sourcing context, and application-oriented engineering guidance. It also organizes replacement questions and design trade-offs so engineers can evaluate the OPA355UA against other high-speed single CMOS amplifiers before committing to a PCB design.
直接替换替代料： OPA355UA ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
OPA357UA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
OPA358UA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
OPA355UA 最大额定值与电气特性
| Amplifier Type | Single voltage-feedback CMOS operational amplifier |
| Number of Circuits | 1 circuit |
| Minimum Operating Supply Voltage | 2.5 V |
| Gain-Bandwidth Product | 200 MHz |
| Common-Mode Input | Rail-to-rail |
| 输出类型 | Rail-to-rail |
| Shutdown Control | Yes |
| Gain Configuration | Unity-gain stable |
| Output Current Capability | Large output currents |
| 工作温度范围 | -40°C to +125°C |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
| Technology | CMOS |
| Application Category | Video and other wide-bandwidth applications |
OPA355UA 引脚配置
| 引脚 1 | NC — Not connected (per datasheet) |
| 引脚 2 | -IN — Inverting input |
| 引脚 3 | +IN — Non-inverting input |
| 引脚 4 | V- — Negative supply |
| 引脚 5 | SHDN — Shutdown control input |
| 引脚 6 | OUT — Output |
| 引脚 7 | V+ — Positive supply |
| 引脚 8 | NC — Not connected (per datasheet) |
典型应用
OPA355UA 适用于 6 应用s: Video Signal Conditioning, High-Speed Analog Filtering, ADC Front-End Conditioning, Communications Signal Chain, Precision Test and Measurement, Low-Power Shutdown-Controlled Analog.
Video Signal Conditioning
The OPA355UA fits video buffers and conditioning stages because the Texas Instruments OPA355 series is explicitly designed for video and other wide-bandwidth applications. Its 200 MHz gain-bandwidth product provides substantial bandwidth for high-resolution and high-frame-rate signal paths, while unity-gain stability supports direct buffering. The rail-to-rail input and output characteristics help preserve signal range in low-voltage systems. In implementation, place the device close to the source and load, keep feedback connections compact, and verify settling at the intended gain. Output-drive and stability checks remain necessary when the amplifier drives long PCB routes, cables, or converter input capacitance.
推荐
High-Speed Analog Filtering
OPA355UA is suitable for wide-bandwidth active filters built around external resistors and capacitors. Its 200 MHz gain-bandwidth product and unity-gain stability allow several common first-order and second-order signal-conditioning topologies to operate with useful bandwidth at modest closed-loop gains. The amplifier's large output-current capability is valuable when driving the next filtering or conversion stage. Component tolerances and parasitic capacitance can shift the realized response, so simulation should include the actual source and load impedances. Keep the feedback network and grounding arrangement compact, and confirm that the selected noise gain remains stable with the intended capacitive loading.
推荐
ADC Front-End Conditioning
The OPA355UA can provide a high-speed interface between a sensor or signal source and a downstream ADC. Its 200 MHz gain-bandwidth product offers margin for amplifying signals before acquisition, and rail-to-rail operation helps maximize usable range in compact mixed-signal systems. The designer should compare amplifier settling time with the converter's acquisition window and verify output swing at the selected gain. Place the amplifier near the ADC input to reduce trace capacitance and susceptibility to interference. Supply bypassing, reference grounding, and the ADC's input-capacitance requirements should be evaluated together rather than treating the amplifier as an isolated gain block.
推荐
Communications Signal Chain
OPA355UA fits low-voltage communications blocks that require a single high-speed amplifier for gain, impedance conversion, or waveform conditioning. The 200 MHz gain-bandwidth product supports broader-band signal paths than conventional general-purpose amplifiers, while the shutdown function can disable the channel during inactive operating periods. Rail-to-rail behavior is useful when the available headroom is limited. Design the surrounding network around the amplifier's actual common-mode and output ranges, and check interference requirements according to the final carrier and clocking architecture. Short traces, a continuous return path, and local bypass capacitance are particularly important at these operating speeds.
推荐
Precision Test and Measurement
OPA355UA can serve as a fast buffer or driver in instrumentation front ends where the measured signal must cross a limited bandwidth without obvious attenuation. Its 200 MHz gain-bandwidth product supports wide-bandwidth measurement nodes, and unity-gain stability simplifies direct probe interfacing. Rail-to-rail input and output operation can improve signal utilization in compact test equipment. The critical checks are source impedance, probe capacitance, output loading, and the required measurement bandwidth. Use short connections, controlled grounding, and stable supply references. When noise dominates the measurement rather than bandwidth, a lower-noise precision amplifier may be more appropriate despite its narrower bandwidth.
推荐
Low-Power Shutdown-Controlled Analog
OPA355UA is appropriate for portable or intermittently operated systems that benefit from an explicit shutdown connection. Its 2.5 V capability supports low-voltage analog rails, and the shutdown function allows an unused amplifier section to be disabled rather than operated continuously. The 8-pin SOIC package also supports compact board layouts. Power-state sequencing must follow the manufacturer's logic-level requirements, and shutdown pins should not be left floating. Decoupling capacitors should be placed close to the supply pins with short return paths. If a system prioritizes minimum leakage over 200 MHz bandwidth, a lower-power amplifier may provide a better overall efficiency trade-off.
推荐
推荐产品汇总
工程参考数据： OPA355UA ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | OPA357UA | OPA358UA |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Amplifier Count | 1 circuit | 1 circuit | 1 circuit |
| Technology | CMOS | CMOS | CMOS |
| Gain-Bandwidth Product | 200 MHz | 200 MHz | 200 MHz |
| Minimum Supply Voltage | 2.5 V | 2.5 V | 2.5 V |
| Output Architecture | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C |
关键差异点
- Full rail-to-rail input and output operation （对比 OPA357UA)
- Identical 200 MHz-class bandwidth positioning （对比 OPA358UA)
- Explicit shutdown function for power management （对比 OPA358UA)
设计说明
Place the supply bypass capacitor immediately beside the OPA355UA positive and negative supply pins. Keep the connection to ground short and low-inductance because the amplifier has a 200 MHz gain-bandwidth product. Route the signal input, output, and feedback paths directly rather than around other circuitry. Return current should remain continuous beneath the device to reduce ground-potential differences across the analog signal path.
Do not assume that unity-gain stability guarantees unconditional stability with every load. Check the output against the impedance and capacitance of the connected cable, ADC input, probe, or next-stage device. If capacitive loading is unavoidable, use a series isolation resistor and verify the resulting response with simulation and oscilloscope measurements. Also ensure the shutdown control is never left floating.
Keep feedback components compact and use the lowest practical parasitic capacitance between the output and inverting input. At high closed-loop gain, even small board parasitics can alter bandwidth and phase margin. Use a continuous ground reference, avoid long stubs, and observe the amplifier with a short, properly terminated connection. Confirm settling time and overshoot in the final system rather than relying only on gain-bandwidth product.
Decouple the OPA355UA supply close to the device and maintain the recommended operating range for every rail state. The shutdown function can reduce consumption during inactive periods, but the transition sequence should not create an uncontrolled transient at the output. Confirm the shutdown logic threshold, input-state behavior, and startup timing against the manufacturer documentation before using the pin in a power-sequencing scheme.
合规信息
The OPA355 family is an industrial-temperature analog IC, so AEC-Q100 qualification is not indicated by the product category. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status should be confirmed from the current manufacturer product documentation.