OPA277U - 1MHz Precision Op Amp | Texas Instruments
MPN： OPA277U ✓ 啟用中OPA277U 概覽
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.
直接替換替代品，適用於 OPA277U — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： OPA277U （相同外形與佔位） — 差異在於 Package.
OPA207
✅ 直接替換📋 參考替代品（不在目錄中）
OPA202
✅ 直接替換📋 參考替代品（不在目錄中）
OP177BRC/883
✅ 直接替換聯絡詢價
查看資料表 →OPA277U 最大額定值與電氣特性
| 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 |
| 封裝 | 8-pin SOIC |
| 安裝類型 | 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 腳位配置指南
OPA277U（8-pin soic 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： OPA277U.
請參閱 資料表 以查看完整腳位配置。
典型應用
OPA277U 適用於 6 應用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.
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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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 OPA277U — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Documented precision offset (對比OPA207)
- Low thermal drift (對比OPA202)
- Modern replacement positioning for the OP177 (對比OP177)
設計說明
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.
合規資訊
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.