OPA631U - 80V 100V/us Single-Supply Op Amp | Texas Instruments
料号： OPA631U ✓ 量产中| 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 |
OPA631U 概述
An operational amplifier is an analog integrated circuit that amplifies the voltage difference between two inputs while using negative feedback to set a stable closed-loop gain. The OPA631 belongs to the voltage-feedback operational-amplifier hierarchy, combining low input noise, wide bandwidth, single-supply operation, and rail-adjacent input capability. These characteristics place it between general-purpose amplifiers and higher-speed precision signal-conditioning devices.
The verified manufacturer material highlights several performance features: high bandwidth, low 6 mA supply current, operation to +10 V, an input range that includes ground, approximately 4.8 V output swing from a +5 V supply, 100 V/us slew rate, and 6 nV/sqrt(Hz) low input-voltage noise. The zero-power disable function can reduce supply consumption when the amplifier is not needed, although the verified excerpts do not specify its exact shutdown-current value.
OPA631U is a voltage-feedback amplifier with one amplifier circuit in an 8-SOIC package. Voltage-feedback topology responds directly to differential input voltage and is suitable for general-purpose gain, filtering, buffering, and instrumentation circuits. Its fast slew rate supports larger signal transitions, while low input voltage noise benefits applications in which source resistance and amplifier noise determine the usable signal floor.
Typical uses include low-voltage sensor conditioning, audio and communication signal paths, analog measurement front ends, active filtering, and low-power instrumentation. When using it on a single supply, verify the selected gain, input range, output swing, load, and stability network against the complete manufacturer datasheet. Input and output behavior near the supply rails must be checked at the actual signal amplitude and frequency.
For PCB implementation, place the feedback network, decoupling capacitors, and input components close to the amplifier pins. Use a ground plane and minimize parasitic capacitance on high-impedance nodes. This page combines the verified distributor identification, manufacturer-family excerpts, packaging information, and design guidance while identifying parameters that require confirmation from the complete datasheet.
The practical design decision is whether the OPA631 speed and noise combination matches the required bandwidth without exceeding power or output-swing limits. Engineers should compare the complete electrical tables, pinout, and package details before production release, especially where input signals approach ground or the output approaches the supply rails.
直接替换替代料： OPA631U ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
OPA631N/250
✅ 直接替换📋 参考替代料（不在目录中）
OPA631N/3K
✅ 直接替换📋 参考替代料（不在目录中）
OPA631U/2K5
✅ 直接替换📋 参考替代料（不在目录中）
OPA631U/2K5
✅ 直接替换📋 参考替代料（不在目录中）
OPA631N
✅ 直接替换📋 参考替代料（不在目录中）
OPA631U 最大额定值与电气特性
| Product Type | Voltage-feedback operational amplifier |
| Number of Amplifier Circuits | 1 circuit |
| 电源电流 | 6 mA |
| Maximum Supply Voltage | +10 V operation |
| Slew Rate | 100 V/us |
| Input Voltage Noise | 6 nV/sqrt(Hz) |
| Input Range | Includes ground |
| Output Swing | 4.8 V from +5 V supply |
| Amplifier Topology | Voltage feedback |
| 封装 | 8-SOIC |
| 安装类型 | Surface mount |
| Zero Power Disable | Supported; current value not provided |
| Supplier Identification | Burr Brown / Rochester Electronics listing |
OPA631U 8-soic 引脚配置指南
OPA631U（8-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： OPA631U.
请参阅 数据手册 以查看完整引脚配置。
典型应用
OPA631U 适用于 8 应用s: Low-Voltage Sensor Signal Conditioning, Active Filtering and Signal Shaping, Audio and Low-Level Analog Signal Paths, Battery-Powered Measurement Equipment, Industrial Control and Instrumentation, Communications and RF-Control Interfaces, Data Acquisition Front Ends, General-Purpose Voltage-Feedback Amplification.
Low-Voltage Sensor Signal Conditioning
OPA631U fits low-voltage sensor front ends where a fast voltage-feedback amplifier can preserve small signal changes without adding excessive supply current. The verified 6 mA supply current supports power-conscious instrumentation, while the 6 nV/sqrt(Hz) input-noise figure is relevant when the sensor source impedance does not dominate amplifier noise. Place the amplifier near the sensor input, use short traces, and verify the actual input common-mode range, offset voltage, bias current, and bias resistor network against the complete datasheet. The 100 V/us slew rate can help when the conditioned signal contains rapid transitions, but sensor bandwidth and noise must be checked before selecting the gain.
推荐
Active Filtering and Signal Shaping
OPA631U can be used in active filters and small-signal conditioning blocks where a voltage-feedback amplifier provides adjustable closed-loop response. Its verified 100 V/us slew rate and single-supply operation are useful when filter outputs must handle changing signal levels, while the approximately 4.8 V output swing on +5 V gives a concrete starting point for headroom analysis. The exact gain-bandwidth value, output-current capability, and stability requirements are not supplied, so component values must be calculated from the complete manufacturer datasheet rather than estimated. Check filter settling, phase margin, output loading, and the interaction between the 6 mA supply current and the rest of the analog system.
推荐
Audio and Low-Level Analog Signal Paths
OPA631U is suitable for audio or communications signal paths that need more slew rate than a general-purpose slow amplifier while operating from a compact supply. The verified 6 nV/sqrt(Hz) input voltage noise supports low-noise signal-chain design, and the 100 V/us slew rate helps preserve larger-amplitude transitions. The reported 4.8 V output swing from +5 V does not guarantee full rail-to-rail operation, so the output load, frequency, and headroom must be verified. Use short feedback paths, keep the output load within the datasheet limits, and avoid relying on unspecified output-current or distortion figures. In microphone or line-level circuits, compare input bias current and noise behavior with the source impedance.
推荐
Battery-Powered Measurement Equipment
OPA631U can fit portable measurement equipment because the verified 6 mA supply current helps limit amplifier power consumption, and the device supports single-supply operation. Its input range that includes ground is useful for signals referenced near 0 V, while the stated operation to +10 V gives a documented supply ceiling to evaluate in the design. Battery applications should still check supply voltage tolerance, disable-state current, input offset, noise integrated over the measurement bandwidth, and output swing. Place bypass capacitors close to the supply pins and use a clean ground return to prevent battery and converter noise from entering the high-impedance signal path.
推荐
Industrial Control and Instrumentation
OPA631U is applicable to industrial instrumentation where a fast, low-supply-current amplifier processes control, feedback, or diagnostic signals. The voltage-feedback architecture is straightforward for closed-loop gain blocks, and the 100 V/us slew rate can accommodate rapidly changing control waveforms. Industrial designs must account for supply transients, common-mode limits, noise coupling, grounding, and the unspecified operating-temperature range. Keep sensitive input nodes away from switching nodes and power-loop currents, use a continuous ground reference, and validate the amplifier against the full datasheet at the highest expected signal frequency. A zero-power disable function may help reduce consumption when the channel is inactive, subject to timing verification.
推荐
Communications and RF-Control Interfaces
OPA631U can be used in communications equipment for low-level control, envelope, or interface amplification where its slew rate is more useful than ordinary slow general-purpose performance. The 6 nV/sqrt(Hz) input noise specification provides a useful starting point for noise budgeting, while the single-supply architecture simplifies systems that operate from a compact rail. RF-control circuits require special attention to input capacitance, layout return paths, output drive, and frequency response; those values are not supplied in the verified excerpts and must be checked in the complete datasheet. Do not place the input directly beside high-energy RF routing without shielding or filtering, and confirm that the amplifier bandwidth supports the intended control-loop bandwidth.
推荐
Data Acquisition Front Ends
OPA631U is relevant to data-acquisition front ends that amplify or buffer sensor outputs before conversion. Its 6 mA supply current and single-supply operation can simplify portable ADC input stages, and the 6 nV/sqrt(Hz) input noise helps establish the amplifier-noise contribution when source resistance is moderate. The input offset, bias current, common-mode range, settling behavior, and ADC drive capability are not available in the supplied data and must be verified before release. Keep the amplifier-to-ADC path short, place anti-aliasing capacitors according to the complete design guidance, and include adequate local bypassing to prevent supply ripple from becoming measurement error.
推荐
General-Purpose Voltage-Feedback Amplification
OPA631U can serve as a general voltage-feedback amplifier in gain, buffer, and reference-conditioning blocks when the design benefits from the verified 6 mA supply current and 100 V/us slew rate. The amplifier is not presented as a rail-to-rail precision part, and the supplied material does not establish offset voltage, bias current, gain bandwidth, or maximum output current. Therefore, use it where those parameters are acceptable only after checking the complete manufacturer datasheet. For non-inverting and inverting configurations, verify resistor values, feedback-loop stability, input and output headroom, and load capacitance. A clean layout and local decoupling are especially important when the amplifier follows a switching converter or drives a long cable.
推荐
推荐产品汇总
工程参考数据： OPA631U ——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 | OPA631N/250 | OPA631N/3K | OPA631U/2K5 | OPA631U | OPA631N |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
关键差异点
- High slew rate in a low-power single-supply amplifier （对比 LM358D)
- Low input-voltage noise specification （对比 NE5532D)
- Single-supply operation with ground-inclusive input range （对比 OPA631N/250)
设计说明
Use the verified 6 mA supply current as the starting operating point for power budgeting, but confirm the actual quiescent current across the selected supply voltage and temperature from the complete datasheet. Estimate amplifier dissipation as PD = (VIN - VOUT) × IOUT plus quiescent overhead when the amplifier is used in a linear signal path. The verified material does not provide output-current limits, absolute-maximum ratings, or disable-state current, so do not use those values as design assumptions.
Place the bypass capacitor and feedback components close to the relevant OPA631U pins, and route high-impedance input traces away from switching nodes and supply-current loops. The verified 6 nV/sqrt(Hz) input-noise figure does not remove PCB leakage, contamination, or ground-current coupling. For single-supply designs, keep the ground return continuous and check the actual signal return path; use the manufacturer pinout and layout guidance before finalizing the 8-SOIC footprint.
Do not treat operation from a single supply as automatic rail-to-rail operation. The verified material states that the input range includes ground and that output swing is approximately 4.8 V on a +5 V supply, so input and output headroom must be checked at the actual gain and load. Also verify whether the zero-power disable function changes timing, output state, and supply current before using it for power gating.
合规信息
The supplied web results do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for OPA631U. These fields must be confirmed from the current manufacturer product documentation or distributor compliance records.
