OPA177GP - 25uV Precision Op Amp | Texas Instruments
MPN： OPA177GP ✓ 啟用中OPA177GP 概覽
A precision operational amplifier is a voltage-amplifier IC designed to minimize input offset voltage and its temperature-dependent drift. This low-error capability places the OPA177GP within the operational-amplifier hierarchy of analog signal-chain ICs, where accurate amplification of small sensor, reference, or measurement signals is more important than high output-current capability. Its bipolar architecture also provides continuous operation without the periodic ripple and frequency artifacts associated with chopper-stabilized amplifiers.
The principal features of the OPA177GP include 25 uV maximum offset voltage, 0.3 uV/°C maximum voltage drift, and 130 dB minimum open-loop gain. Its 1.5 mA typical quiescent current supports power-conscious precision systems when the signal bandwidth and load requirements are moderate. The manufacturer identifies the device as a low-noise bipolar operational amplifier and describes it as an effective alternative to chopper-stabilized amplifiers.
The combination of low offset, low drift, and high open-loop gain improves closed-loop accuracy in amplifier configurations where gain and feedback resistors establish the nominal gain. High open-loop gain reduces the contribution of input-referred error to the output, while low offset drift limits calibration changes over temperature. Because the OPA177GP uses a bipolar input stage, engineers can evaluate its bias-current and noise characteristics against the source impedance and bandwidth of the selected sensor or signal source.
Typical uses include precision instrumentation, low-level sensor signal conditioning, current measurement, laboratory equipment, and analog signal buffers. It is also suitable for applications requiring accurate DC amplification without the periodic output disturbance of a chopper-stabilized amplifier. The 8-pin PDIP package is appropriate for through-hole prototype, industrial control, and test-equipment layouts where sufficient board space is available.
When designing around the OPA177GP, verify the complete electrical limits, supply range, common-mode range, output swing, and stability conditions in the manufacturer datasheet. Input bias-current return paths, source impedance, feedback resistance, and output loading can materially affect accuracy and noise. Decoupling should follow the application guidance in the manufacturer data sheet, and unused inputs should be handled according to the recommended circuit arrangement.
This page combines the OPA177GP operating characteristics, a documented drop-in comparison with the Analog Devices OP177, and practical guidance for precision amplifier selection. It helps engineers distinguish offset, drift, gain, noise, and packaging considerations before committing a high-accuracy analog design to a through-hole operational-amplifier footprint.
直接替換替代品，適用於 OPA177GP — 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： OPA177GP （相同外形與佔位） — 差異在於 Amplifier Type, Package.
OP177BRC/883
✅ 直接替換聯絡詢價
查看資料表 →OPA177GP 最大額定值與電氣特性
| Product Type | Precision operational amplifier |
| Amplifier Type | Single amplifier |
| Input Offset Voltage | 25 uV maximum |
| Offset Voltage Drift | 0.3 uV/°C maximum |
| Open-Loop Gain | 130 dB minimum |
| 靜態電流 | 1.5 mA typical |
| Input Architecture | Bipolar |
| Circuit Count | 1 circuit |
| 封裝 | 8-pin PDIP |
| 安裝類型 | Through-hole |
OPA177GP 8-pin pdip 腳位配置指南
OPA177GP（8-pin pdip 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： OPA177GP.
請參閱 資料表 以查看完整腳位配置。
典型應用
OPA177GP 適用於 6 應用s: Precision Sensor Signal Conditioning, Laboratory Instrumentation, Precision Current Measurement, Precision Voltage Reference Buffering, Low-Level DC Amplification, Industrial Control and Measurement.
Precision Sensor Signal Conditioning
The OPA177GP fits low-level sensor front ends that require accurate amplification of small DC signals. Its 25 uV maximum input offset voltage and 0.3 uV/°C maximum drift limit errors created when a sensor output passes through a high-gain amplifier, while 130 dB minimum open-loop gain supports accurate closed-loop behavior. Place the device close to the sensor or bridge network and keep sensitive input traces short. The principal design check is input bias current, because current flowing through a high source resistance can create an error larger than the amplifier's offset voltage. Stable feedback resistors and suitable supply bypassing also help preserve the intended precision over temperature.
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Laboratory Instrumentation
Laboratory instruments benefit from the OPA177GP's combination of low offset, low temperature drift, and high open-loop gain. It can amplify thermocouple, strain-gauge, or buffered-reference signals where error introduced by the amplifier would limit measurement resolution. The 25 uV maximum offset and 0.3 uV/°C maximum drift are especially useful in equipment expected to maintain calibration across temperature changes. Use clean grounding, low-leakage input protection, and a shielded enclosure when measuring microvolt-level signals. Because the OPA177GP is a bipolar amplifier, verify input bias current against the transducer resistance and evaluate the input noise contribution at the measurement bandwidth.
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Precision Current Measurement
The OPA177GP is suitable for current-to-voltage and shunt-amplifier circuits where small differential signals must be amplified accurately. Its 25 uV maximum offset voltage limits the output error introduced by the amplifier, and 130 dB minimum open-loop gain supports high closed-loop accuracy in a typical inverting configuration. The 1.5 mA typical quiescent current also makes the device practical for compact multi-channel measurement equipment. Match resistor ratios carefully to control gain error, and observe the output-swing limits at the selected supply voltage. Input protection should limit differential voltage during fault conditions without adding excessive leakage to the shunt or sense-resistor node.
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Precision Voltage Reference Buffering
OPA177GP can buffer a low-impedance reference voltage for an analog measurement chain without adding substantial offset or drift error. Its 130 dB minimum open-loop gain improves voltage-following accuracy, while the 25 uV maximum input offset voltage is small relative to millivolt-level reference nodes. The amplifier's bipolar input stage also makes it suitable for DC-oriented reference buffering, subject to bias-current error in the source. Keep the feedback loop short and avoid placing large capacitive loads directly on the output. For references requiring very low noise or very low bias current, compare those specifications before selecting the amplifier, since the OPA177GP is optimized primarily for precision rather than minimum-power operation.
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Low-Level DC Amplification
The OPA177GP supports low-level DC amplification in test fixtures, bridge amplifiers, and analog monitoring systems where converter ripple and offset drift must remain below the signal of interest. Its 0.3 uV/°C maximum offset drift limits temperature-induced calibration error, and the 130 dB minimum open-loop gain improves loop accuracy. A bipolar precision device can also provide continuous low-frequency operation without the periodic disturbance associated with a chopper-stabilized amplifier. Place supply bypass capacitors near the device, maintain a low-impedance ground reference, and use matched feedback resistors for good common-mode rejection. Confirm output headroom and stability with the actual source and load impedances before finalizing the gain stage.
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Industrial Control and Measurement
OPA177GP is applicable to industrial measurement modules that combine slow-changing sensor signals with relatively high accuracy requirements. The 25 uV maximum offset voltage, 0.3 uV/°C maximum drift, and 130 dB minimum open-loop gain support accurate signal conditioning in temperature, pressure, and strain acquisition channels. Its through-hole 8-pin PDIP package is convenient for industrial controller boards and through-hole prototype assemblies. Engineer the input stage for the sensor's source impedance, add protection against industrial transients, and isolate analog and digital return currents where possible. Verify the operating-temperature grade and electrical limits in the manufacturer orderable information before using the device in an enclosure with elevated internal temperature.
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推薦產品摘要
工程參考資料，適用於 OPA177GP — 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 | OP177 |
|---|---|---|
| Package | 8-pin PDIP | 8-pin PDIP |
| Brand | Texas Instruments | Analog Devices |
| Product Type | Precision bipolar operational amplifier | Precision operational amplifier |
| Input Offset Voltage | 25 uV maximum | 25 uV maximum |
| Offset Voltage Drift | 0.3 uV/°C maximum | 0.3 uV/°C maximum |
| Open-Loop Gain | 130 dB minimum | 12 V/uV, approximately 121.6 dB |
| Quiescent or Supply Current | 1.5 mA typical quiescent current | 2 mA maximum supply current |
| Noise Architecture | Low-noise bipolar operational amplifier | Precision low-offset operational amplifier |
主要差異化特點
- Higher specified open-loop gain (對比OP177)
- Matched precision offset performance (對比OP177)
- Low typical quiescent current (對比OP177)
設計說明
Route the two input pins as a short, closely spaced pair and keep them away from switching nodes, high-current return paths, and digital clock traces. The OPA177GP's 25 uV maximum offset specification is valuable only when the PCB does not add thermal gradients or leakage-induced errors at the input. Place input protection components close to the package and verify their leakage and capacitance against the intended source impedance.
Apply the supply bypassing and grounding arrangement described in the Texas Instruments OPA177 data sheet, with short return paths to the device. Keep the bypass capacitor and amplifier ground connection compact so supply ripple does not convert into output error. The stated 1.5 mA typical quiescent current excludes the load current and the supply-bypass current, so calculate total channel power from the actual operating state rather than the quiescent value alone.
Do not select the amplifier from offset voltage alone. Check input bias current against the sensor resistance, input noise over the required bandwidth, common-mode range, output swing, supply range, and capacitive-load stability. For the OP177 cross-brand replacement, the published open-loop gain is approximately 121.6 dB versus 130 dB minimum for OPA177GP, so re-evaluate closed-loop error in the highest-gain channel before substitution.
合規資訊
Compliance details were not established by the cited product pages and data-sheet snippets. Confirm current environmental and material declarations with the manufacturer orderable information before production release.