OPA277U - 1MHz Precision Op Amp | Texas Instruments
料号： OPA277U ✓ 量产中OPA277U 概述
A precision operational amplifier is a voltage-input, differential signal amplifier whose internal gain and feedback network are designed to minimize error introduced by input offset voltage, bias current, noise, and drift. Within the broader semiconductor hierarchy, an operational amplifier belongs to the amplifier IC family and is used in instrumentation, control, measurement, conversion, and analog signal-conditioning systems. The OPA277U is intended for precision rather than high-speed or rail-to-rail applications.
The most important feature is its 10 µV offset voltage, supported by a specified drift characteristic of 0.1 µV/°C. These parameters make the device useful where DC accuracy must remain stable as temperature changes. Its 1 MHz gain-bandwidth product and 0.8 V/µs slew rate provide adequate bandwidth for many precision feedback networks while retaining the slow, low-noise characteristics associated with a bipolar precision amplifier.
The OPA277U operates across ±2 V to ±18 V supplies, corresponding to the documented 36 V maximum rating. This supply range supports conventional dual-supply instrumentation systems and higher-voltage bipolar rails where appropriate. Because it is not identified as a rail-to-rail input or output device in the supplied product information, system designers should verify signal-swing and common-mode limits against the manufacturer datasheet before operation.
Typical uses include precision instrumentation, low-level sensor signal conditioning, bridge and transducer amplification, laboratory measurement equipment, and analog control loops. The device can also serve as a high-gain error amplifier when its bandwidth, slew rate, output swing, and stability requirements suit the selected feedback network. Its low offset and drift are particularly valuable when the measurement path must distinguish small signals from temperature-dependent errors.
Designers should verify the exact pin functions, common-mode range, output swing, input bias current, noise density, and recommended compensation values in the manufacturer datasheet before layout. Decoupling should follow the datasheet guidance, and precision feedback traces should be kept short and away from noisy switching nodes. Stable operation also depends on selecting the correct closed-loop gain and avoiding saturation.
This product record combines verified Texas Instruments specifications, current distributor pricing, package information, sourcing links, and substitution guidance. It also separates documented drop-in candidates from options that require package or electrical verification, helping engineers identify a true replacement without treating merely similar amplifiers as interchangeable.
直接替换替代料： OPA277U ——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： OPA277U （相同外形与封装尺寸） ——差异在于 Package.
OPA207
✅ 直接替换📋 参考替代料（不在目录中）
OPA202
✅ 直接替换📋 参考替代料（不在目录中）
OP177BRC/883
✅ 直接替换联系询价
查看数据手册 →OPA277U 最大额定值与电气特性
| Amplifier Type | Precision bipolar operational amplifier |
| Number of Amplifiers | 1 circuit |
| Maximum Supply Voltage | 36 V |
| Operating Supply Voltage Range | ±2 V to ±18 V |
| Input Offset Voltage | 10 µV |
| Input Offset Voltage Drift | 0.1 µV/°C |
| Gain-Bandwidth Product | 1 MHz |
| Slew Rate | 0.8 V/µs |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
| Listed Price | $4.3723 as of 2026-10-29 |
| Manufacturer | Texas Instruments |
| Product Family | OPA277 |
| Device Type | General-purpose precision amplifier |
OPA277U 8-pin soic 引脚配置指南
OPA277U（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： OPA277U.
请参阅 数据手册 以查看完整引脚配置。
典型应用
OPA277U 适用于 6 应用s: Precision Instrumentation, Bridge and Transducer Amplification, Laboratory Measurement Equipment, Low-Noise Audio Signal Conditioning, Analog Control Loops, Sensor Interface and Data Conditioning.
Precision Instrumentation
The OPA277U fits precision instrumentation because its 10 µV offset voltage and 0.1 µV/°C drift limit errors that could obscure small differential signals. It can amplify the output of a bridge or front-end transducer while the 1 MHz gain-bandwidth product supports feedback networks that do not require wideband settling. The 0.8 V/µs slew rate provides finite large-signal response, so the selected closed-loop gain and signal amplitude must preserve stability and avoid saturation. Supplying the amplifier from ±2 V to ±18 V supports conventional laboratory and industrial analog rails. For an instrument-grade implementation, verify the manufacturer datasheet for exact common-mode range, output swing, noise density, bias current, and recommended compensation before finalizing the circuit.
推荐
Bridge and Transducer Amplification
OPA277U is appropriate for bridge or transducer amplification when the wanted measurement is small relative to the applied excitation and thermal drift could otherwise dominate the result. Its 10 µV input offset establishes a useful low-level error baseline, while the 0.1 µV/°C drift characteristic supports stable measurements as temperature changes. The 1 MHz gain-bandwidth product allows useful closed-loop bandwidth at moderate gains, although the 0.8 V/µs slew rate should be checked against large transient outputs. In a practical bridge circuit, the amplifier converts the differential bridge voltage relative to ground, after which calibration and filtering may be applied. Confirm input bias current and common-mode limits against the exact sensor bridge, especially when excitation voltage and sensor impedance differ from typical laboratory conditions.
推荐
Laboratory Measurement Equipment
The OPA277U can support laboratory measurement equipment that must preserve small signal amplitudes and reject offset error. Its 10 µV offset and 0.1 µV/°C drift are directly aligned with precision DC measurement, while its 1 MHz gain-bandwidth product is suitable for many sensor and source-measurement loops operating below full bandwidth. A conventional bipolar supply from ±2 V to ±18 V fits instrumentation that already uses positive and negative analog rails. When configuring gain, account for the 0.8 V/µs slew rate so large output steps do not create excessive settling time. Designers should also validate the selected resistor network, input filtering, grounding strategy, and output-swing margin. Manufacturer-datasheet verification remains necessary for noise density, bias current, common-mode range, and stability because those values were not included in the supplied web snippets.
推荐
Low-Noise Audio Signal Conditioning
OPA277U can be used for low-level audio signal conditioning when accuracy is prioritized over wide bandwidth and rail-to-rail swing. The device's 10 µV offset and 0.1 µV/°C drift help prevent small DC errors from limiting the usable signal range in a high-gain stage. Its 1 MHz gain-bandwidth product and 0.8 V/µs slew rate are adequate for many audio-frequency feedback networks, but output current, load, and slew-driven distortion must be reviewed for the selected topology. The ±2 V to ±18 V operating range is compatible with many traditional dual-rail audio systems. Place the amplifier where feedback traces are short, maintain a stable reference or decoupled power node, and verify the actual output swing and noise density from the manufacturer datasheet before using it in a microphone, line-level, or preamplifier signal chain.
推荐
Analog Control Loops
OPA277U is suitable for slow analog control loops in which stable error amplification and low drift are more useful than high speed. A 10 µV input offset and 0.1 µV/°C drift reduce the influence of amplifier-generated errors in a feedback controller, while the 1 MHz gain-bandwidth product provides response beyond very slow control loops. The 0.8 V/µs slew rate can support moderate actuator or set-point transitions, but the design must limit loop gain so that crossover frequency and phase margin remain acceptable. Operation from ±2 V to ±18 V is suitable for bipolar control systems with positive and negative rails. Engineer the loop around the selected compensation network rather than assuming the gain-bandwidth product alone determines stability. Also verify output swing against actuator limits and confirm that the common-mode input range includes the error signal under all operating conditions.
推荐
Sensor Interface and Data Conditioning
OPA277U is appropriate for conditioning sensor outputs where small differential signals must be amplified before conversion or comparison. Its 10 µV offset and 0.1 µV/°C drift help preserve accuracy as ambient conditions change, while the 1 MHz gain-bandwidth product covers many sensor interfaces operating well below the amplifier's upper bandwidth. The 0.8 V/µs slew rate must be considered when sensor events create abrupt changes, and the ±2 V to ±18 V supply range supports established bipolar analog systems. A practical implementation can amplify the sensor differential output, apply passive filtering, and then feed a downstream converter or comparator. Verify the source impedance, sensor excitation, input bias current, and common-mode range before selecting resistor values. Also maintain a low-noise ground reference and prevent digital or switching signals from coupling into the high-impedance input node and degrading the effective measurement noise.
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推荐产品汇总
工程参考数据： OPA277U ——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 | OPA207 | OPA202 | OP177 |
|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
关键差异点
- Documented precision offset （对比 OPA207)
- Low thermal drift （对比 OPA202)
- Modern replacement positioning for the OP177 （对比 OP177)
设计说明
Do not substitute OPA277U solely because another amplifier uses an 8-pin SOIC package. Confirm the manufacturer pinout, especially the offset-null and compensation pins, because these functions can prevent otherwise similar devices from operating correctly on the same PCB. Review the 10 µV offset and 0.1 µV/°C drift requirements together with input bias current, common-mode range, output swing, noise, bandwidth, and slew rate. A true drop-in decision requires the alternative's exact orderable MPN and datasheet rather than a family-level name.
Route precision feedback and input connections as short traces on a quiet ground plane, and place the amplifier close to the source being measured. High-impedance input nodes are particularly sensitive to leakage, contamination, and nearby switching nodes. Maintain a stable ground reference for the entire analog signal chain and keep digital return currents from crossing the input area. Although verified pin-specific decoupling values were not included in the supplied data, follow the manufacturer datasheet's recommended supply capacitors and placement requirements.
Select feedback resistors and compensation for the intended closed-loop gain while accounting for the OPA277U's 1 MHz gain-bandwidth product and 0.8 V/µs slew rate. Confirm stability with the actual source and load impedances, output capacitance, and PCB parasitics rather than relying only on a nominal gain plot. In sensor interfaces, evaluate offset drift over the full temperature range and include sensor excitation variation in the error budget. The documented 10 µV offset and 0.1 µV/°C drift are useful baselines but do not eliminate noise or gain error.
合规信息
The supplied official-page and distributor snippets do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The product is an operational amplifier rather than an automotive-qualified device; no AEC-Q100 qualification was identified in the verified data.