OPA635U - 100MHz High-Speed Amplifier | Texas Instruments
料号： OPA635U ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
OPA635U 概述
A high-speed operational amplifier is a voltage-feedback amplifier designed to amplify rapidly changing signals while maintaining useful gain, bandwidth, slew rate, and signal integrity. Within the broader hierarchy, an operational amplifier is an analog IC, and the OPA635U belongs to the high-speed voltage-feedback amplifier family. Its SpeedPlus architecture targets circuits requiring wide bandwidth and fast large-signal response without relying on a complex external compensation network.
Key features include bandwidth extending to 100 MHz under the stated gain condition, 250 V/us slew rate, and 5.6 nV/sqrt(Hz) low input-voltage noise. The device supports operation to +10 V, can drive 80 mA, and can be placed in a shutdown state when the OPA635 version's power-disable function is used. Its input range extends to ground, making it relevant to single-supply systems that process signals near 0 V.
The combination of high bandwidth and slew rate is useful in video and test equipment, high-speed filters, communications interfaces, active impedance conversion, and instrumentation buffers. Low input noise is especially relevant when amplifying small signals, while the 80 mA output-current capability provides drive for downstream stages and termination networks. Actual gain bandwidth, stability, and output swing depend on the selected gain, supply voltage, load, and feedback network.
For +5 V operation, the verified data identifies a 4.8 V output swing, which leaves less headroom than the full supply rail and should be considered when designing receiver or driver interfaces. The 250 V/us slew rate supports fast transitions, but board parasitics, capacitive loading, and feedback-loop stability remain critical at high frequency. The SOIC package helps preserve the amplifier's high-frequency behavior compared with larger parasitic packages.
A practical design should use short, controlled-impedance traces, a small, symmetric feedback network, and decoupling close to the supply pins. If the application does not need shutdown, the disable function should be tied to its inactive level according to the manufacturer datasheet. Confirm stability and output swing on the completed PCB because high-speed amplifier performance is sensitive to loading, grounding, and component placement.
This page consolidates the verified OPA635U features, source links, package information, design cautions, and replacement-status assessment. It is intended to help engineers locate the datasheet, understand the core electrical limits, and plan a replacement without assuming that merely similar amplifier specifications guarantee drop-in compatibility.
直接替换替代料： OPA635U ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： OPA635U （相同外形与封装尺寸） ——差异在于 Amplifier Type, Package.
快速对比工具——选择替代料号进行并排对比：
该产品暂无直接替换替代料。
请求替代料OPA635U 最大额定值与电气特性
| Amplifier Type | Single voltage-feedback operational amplifier |
| Number of Circuits | 1 circuit |
| Gain-Bandwidth Product | 100 MHz |
| Slew Rate | 250 V/us |
| Input Voltage Noise | 5.6 nV/sqrt(Hz) |
| Maximum Supply Voltage | +10 V |
| Output Swing on +5 V Supply | 4.8 V |
| Output Current | 80 mA |
| Input Range | Includes ground |
| Power Disable | Yes, OPA635 version |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
| Temperature Grade | Industrial |
| Terminal Form | Gull wing |
| Number of Terminals | 8 |
| 输出类型 | Voltage feedback amplifier |
OPA635U 8-pin soic 引脚配置指南
OPA635U（8-pin soic 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： OPA635U.
请参阅 数据手册 以查看完整引脚配置。
典型应用
OPA635U 适用于 7 应用s: High-Speed Video Signal Conditioning, Communications Receiver Front End, Precision Instrumentation Buffer, Active Filter and Equalizer, Test and Measurement Amplifier, Single-Supply Analog Interface, Portable and Battery-Powered Signal Paths.
High-Speed Video Signal Conditioning
The OPA635U fits video-signal conditioning because the verified 100 MHz gain-bandwidth product and 250 V/us slew rate provide the basic speed needed for wideband voltage amplification. It can be used as a gain stage, buffer, or active-filter element when the selected closed-loop gain preserves stability. The 4.8 V output swing from a +5 V supply should be checked against the video interface levels. Short traces, matched feedback resistors, and controlled loading are essential because PCB capacitance can change the effective bandwidth and ringing.
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Communications Receiver Front End
The OPA635U can serve in a communications receiver when the design requires a high-speed, low-noise voltage-feedback amplifier rather than a general-purpose precision op amp. Its 5.6 nV/sqrt(Hz) input-voltage noise is useful for weak received signals, while 100 MHz bandwidth and 250 V/us slew rate help preserve fast transitions. The amplifier still requires a valid input common-mode range, adequate supply headroom, and a feedback network that remains stable at the intended gain. Cable and board capacitance should be treated as part of the signal path.
推荐
Precision Instrumentation Buffer
OPA635U is applicable to instrumentation buffers that need more bandwidth and slew rate than a conventional precision amplifier, especially when sensor outputs change quickly. Its low input voltage noise helps preserve small signals, while the 80 mA output-current capability provides drive for subsequent analog stages. Instrumentation use still demands attention to offset, bias current, common-mode range, stability, and resistor noise, which are not fully specified in the supplied verified snippets. A unity-gain or inverting configuration should be checked against the manufacturer datasheet before layout release.
推荐
Active Filter and Equalizer
The OPA635U can implement wideband active filters or equalizer stages because its 100 MHz bandwidth and 250 V/us slew rate support fast signal movement. The ground-inclusive input range is useful in single-supply analog circuits, although the output swing of 4.8 V on +5 V must remain within the signal-chain limits. Component tolerances, feedback-ratio stability, and the amplifier's interaction with capacitive loads can materially alter filter response. Simulate the complete network and verify it with a prototype using controlled-impedance routing and adequate decoupling.
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Test and Measurement Amplifier
OPA635U is useful in test equipment when a sensor or source requires a wideband amplifier with faster response than a conventional precision op amp. The 5.6 nV/sqrt(Hz) input noise and 100 MHz bandwidth provide useful starting performance for small-signal measurement paths, while shutdown can help control power in repeated test cycles. Measurement accuracy still depends on offset, drift, bias current, common-mode range, and resistor selection, none of which can be inferred from the supplied snippets. Use short guarded traces and verify calibration behavior over temperature.
推荐
Single-Supply Analog Interface
The OPA635U is appropriate for single-supply interface designs whose signals operate near ground because the verified input range includes ground. It can buffer or amplify low-side analog signals while operating from a supply as high as +10 V, subject to the exact common-mode and output limits in the datasheet. The 4.8 V swing on a +5 V supply leaves margin limitations for logic thresholds, so level-shift or rail-to-rail devices may be preferable in some interfaces. Decoupling and return-current layout should be selected for the operating bandwidth.
推荐
Portable and Battery-Powered Signal Paths
OPA635U can be considered for portable signal paths when the OPA635 shutdown function helps reduce power during inactive intervals. The 250 V/us slew rate supports fast transient handling, and the 80 mA output capability can drive a moderate downstream load, but battery designs must account for supply-current behavior and output-swing limits at low voltage. The verified data does not provide a complete current-consumption curve or battery-voltage range, so those values must be checked in the datasheet. Battery operation should also be evaluated for noise, startup behavior, and thermal rise.
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推荐产品汇总
工程参考数据： OPA635U ——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 |
|---|---|
| Package | 8-pin SOIC |
| Brand | Texas Instruments |
| Gain-Bandwidth Product | 100 MHz |
| Slew Rate | 250 V/us |
| Input Voltage Noise | 5.6 nV/sqrt(Hz) |
| Maximum Supply Voltage | +10 V |
| Output Swing on +5 V Supply | 4.8 V |
| Output Current | 80 mA |
| Input Range | Includes ground |
| Shutdown Function | Yes, OPA635 version |
关键差异点
- High-speed signal conditioning in a compact SOIC （对比 OPA633)
- Shutdown support in the OPA635 version （对比 Generic high-speed op amp)
- Ground-inclusive single-supply input operation （对比 Rail-to-rail-input amplifier)
设计说明
Use short, controlled-impedance traces for the input, output, feedback, and supply connections. Place the feedback network close to the OPA635U and use resistor values that preserve the intended closed-loop gain and stability. At high frequency, even a small parasitic capacitance at a feedback node or output can introduce peaking, ringing, or oscillation. Prototype with the intended load, connector, and grounding arrangement.
Place supply-decoupling capacitors immediately adjacent to the amplifier's supply pins and provide a low-impedance return path. The verified data emphasizes high-bandwidth operation and ground-inclusive input range, but those specifications do not remove the need for clean supply distribution. Keep analog signal routing away from noisy switching nodes and high-current return paths. Validate the PCB with a high-impedance probe or suitable test equipment because package and fixture capacitance can alter the result.
Do not treat the 4.8 V output swing on a +5 V supply as a full-rail-to-rail capability, and do not assume that every input near ground is acceptable without checking the complete common-mode range. The shutdown pin must be driven to a defined state even when shutdown is unused. Also avoid selecting a replacement based only on 100 MHz bandwidth; confirm supply range, pinout, output swing, stability, and disable behavior.
合规信息
The verified search results do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The component is an industrial-grade 8-pin SOIC according to the Partstack listing, but that does not establish AEC-Q100 qualification.