OPA37GU - 63MHz Ultra-Low-Noise Precision Op Amp | TI
MPN： OPA37GU ✓ 啟用中OPA37GU 概覽
An operational amplifier is an analog integrated circuit that amplifies the voltage difference between its inverting and non-inverting inputs. Precision operational amplifiers add low offset, low bias current, high open-loop gain, and common-mode rejection for instrumentation, audio, sensor, and measurement systems. The OPA37 is a decompensated amplifier, so its stable operating-gain requirement must be considered when selecting feedback values.
Key verified features include 4.5 nV/√Hz maximum input noise at 1 kHz, 100 µV maximum input offset voltage, 0.4 µV/°C offset drift, 117 dB minimum open-loop gain, 100 dB minimum common-mode rejection, and 94 dB minimum power-supply rejection. The supplied product information identifies a ±4 V to ±22 V supply range and a 59 A device-level rating in distributor search data, although the exact application limits should be confirmed against the manufacturer datasheet.
OPA37 family devices use a decompensated architecture intended for higher closed-loop gain than a unity-gain-stable amplifier. The 63 MHz gain-bandwidth product and 11.9 V/µs slew rate support wideband small-signal and precision signal paths, while the low-noise specification is particularly relevant to audio and measurement front ends. Stable feedback-network design remains essential because decompensated amplifiers may require a minimum closed-loop gain.
Typical applications include professional audio equipment, low-noise microphone preamplifiers, instrumentation amplifiers, precision measurement front ends, active filters, and signal-conditioning circuits. The 8-pin SOIC package supports conventional surface-mount PCB assembly, while its low offset and noise help reduce calibration burden when the signal source is close to the input noise floor.
When laying out an OPA37GU circuit, place input, feedback, and decoupling components close to the relevant pins, maintain short ground-return paths, and verify the required minimum closed-loop gain. Use the manufacturer datasheet for complete electrical limits, compensation guidance, common-mode range, output-drive capability, and package drawings. This page combines verified source data with selection and design guidance intended to support engineering comparison rather than replace the datasheet.
直接替換替代品，適用於 OPA37GU — 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： OPA37GU （相同外形與佔位） — 差異在於 Operating Temperature Range, Manufacturer, Amplifier Type, Number of Circuits, Product Type.
OPA37GU
✅ 直接替換聯絡詢價
查看資料表 →OPA37GP
✅ 直接替換聯絡詢價
查看資料表 →OPA37GU/2K5
✅ 直接替換📋 參考替代品（不在目錄中）
OPA37GU-2K5G4
✅ 直接替換📋 參考替代品（不在目錄中）
OPA27GU
✅ 直接替換聯絡詢價
查看資料表 →AD510SH
✅ 直接替換聯絡詢價
查看資料表 →AD5174BRMZ-10
✅ 直接替換聯絡詢價
查看資料表 →OPA37GU 最大額定值與電氣特性
| Amplifier Type | Single decompensated precision operational amplifier |
| Number of Channels | 1 channel |
| Gain-Bandwidth Product | 63 MHz |
| Slew Rate | 11.9 V/µs |
| Input Noise Density | 4.5 nV/√Hz maximum at 1 kHz |
| Input Offset Voltage | 100 µV maximum |
| Input Offset Voltage Drift | 0.4 µV/°C maximum |
| Open-Loop Gain | 117 dB minimum |
| Common-Mode Rejection | 100 dB minimum |
| Power-Supply Rejection | 94 dB minimum |
| Supply Voltage Range | ±4 V to ±22 V |
| 封裝 | 8-pin SOIC |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | -40 °C to +85 °C |
OPA37GU 8-pin soic 腳位配置指南
OPA37GU（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： OPA37GU.
請參閱 資料表 以查看完整腳位配置。
典型應用
OPA37GU 適用於 6 應用s: Professional Audio Preamplifier, Precision Instrumentation Front End, Active Audio Filter, Low-Noise Sensor Signal Conditioning, Precision Measurement Amplifier, Precision Voltage Reference Buffer.
Professional Audio Preamplifier
OPA37GU fits low-noise professional audio preamplification because the verified data specifies 4.5 nV/√Hz maximum input noise density at 1 kHz and 11.9 V/µs slew rate. Place it in a closed-loop gain stage with feedback and compensation values selected according to the decompensated OPA37 architecture. The low-noise input stage can improve signal-to-noise ratio for microphone or line-level sources, while the 63 MHz gain-bandwidth product preserves bandwidth for transient-rich audio. Confirm output swing, load impedance, supply headroom, and stability before production; the headline bandwidth does not remove the need for correct gain configuration.
推薦
Precision Instrumentation Front End
OPA37GU is suitable for precision instrumentation when low offset and high rejection improve signal integrity. The verified values include 100 µV maximum input offset voltage, 0.4 µV/°C maximum offset drift, 117 dB minimum open-loop gain, and 100 dB minimum common-mode rejection. Use the amplifier in a gain stage that respects the OPA37 minimum closed-loop gain, with short input traces and a quiet reference or sensor return. The 63 MHz bandwidth provides margin for measurement bandwidth, but designers must still evaluate noise bandwidth, source impedance, input bias current, and common-mode limits with the complete manufacturer datasheet.
推薦
Active Audio Filter
OPA37GU can be used in active filtering where low noise and wideband signal capability are valuable. Its verified 63 MHz gain-bandwidth product and 11.9 V/µs slew rate provide dynamic range for filter stages operating above audio frequencies, while the 4.5 nV/√Hz maximum noise density at 1 kHz helps limit added circuit noise. Because the device is decompensated, choose the closed-loop gain and feedback values required by the OPA37 family rather than copying a unity-gain filter. Simulate component tolerances and verify phase margin, output drive, and supply headroom at the intended load.
推薦
Low-Noise Sensor Signal Conditioning
OPA37GU is appropriate for sensor signal conditioning when the sensor output is small and system noise is important. The verified specifications of 100 µV maximum input offset voltage and 0.4 µV/°C maximum drift help reduce fixed and temperature-related error, while 100 dB minimum common-mode rejection can suppress common-mode disturbances in the measurement path. Use a gain stage above the required decompensated minimum, keep sensor and amplifier grounds short, and control leakage around high-impedance inputs. Verify input bias current and common-mode behavior because those values are not provided in the supplied source data.
推薦
Precision Measurement Amplifier
OPA37GU can serve in precision measurement amplifiers where small differential signals must be amplified while rejecting supply and common-mode disturbances. The verified 117 dB minimum open-loop gain, 94 dB minimum power-supply rejection, and 94 dB-class supply-noise performance support accurate signal recovery, while the 63 MHz bandwidth allows higher-bandwidth instrumentation than a slow precision-only amplifier. The decompensated topology requires deliberate gain selection and stability verification. Keep input and feedback components compact, use low-noise supplies, and confirm output current and settling behavior against the complete manufacturer datasheet.
推薦
Precision Voltage Reference Buffer
OPA37GU can be used to buffer a precision reference when the load requires low added noise and accurate drive. Its 100 µV maximum input offset voltage, 0.4 µV/°C maximum offset drift, 94 dB minimum power-supply rejection, and high open-loop gain are useful for reducing reference-chain error. Configure the amplifier at a closed-loop gain permitted by the OPA37 decompensated architecture and confirm that the output reference current, capacitive loading, and supply range remain within the manufacturer’s limits. The source data does not provide output-current or settling-time values, so those requirements must not be assumed.
推薦
推薦產品摘要
工程參考資料，適用於 OPA37GU — 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 | OPA37GU/2K5 | OPA37GU-2K5G4 | OPA27GU | AD510 |
|---|---|---|---|---|---|
| Package | 8-pin SOIC | SOIC-8 family variant | SOIC-8 family variant | SOIC-8 related family variant | SOIC-8 cross-reference candidate |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
主要差異化特點
- Verified low-noise performance for precision audio and measurement (對比OPA27GU)
- High-bandwidth decompensated precision architecture (對比AD510)
- Precision DC error specifications (對比AD517)
設計說明
OPA37GU is decompensated, so stability begins with selecting the intended closed-loop gain and a feedback network that satisfies the OPA37 family’s minimum-gain requirement. Do not design it as an unrestricted unity-gain buffer. Check phase margin across the intended noise and signal bandwidth, especially when capacitive loading is present. The verified 63 MHz gain-bandwidth product is a useful bandwidth indicator, but it does not establish stability without the correct topology.
Keep the non-inverting and inverting input paths short, particularly when source impedance is high. Place feedback resistors and compensation-related components close to the amplifier pins, use a continuous low-impedance ground return, and place supply bypass capacitance at the device supply pins. These layout practices reduce parasitic capacitance, leakage, and supply-impedance effects that can degrade a low-noise precision amplifier.
Design the power rails around the verified ±4 V to ±22 V supply range while separately checking absolute maximum limits, common-mode range, output swing, and dissipation in the manufacturer datasheet. A dual-supply notation of ±22 V describes a rail-to-rail span of 44 V, not a 44 V output capability. Use local decoupling and keep the amplifier’s supply current within the package and thermal design limits; those current and thermal figures are not included in the supplied data.
Do not approve a substitute solely because it has the same 8-pin SOIC outline. Confirm exact pin functions, decompensation or minimum-gain behavior, supply range, input common-mode range, noise, offset, bandwidth, slew rate, output drive, and temperature grade. The provided cross-reference material identifies OPA37 family socket candidates but does not supply complete verified electrical data for every candidate, so each substitution requires datasheet review and bench validation.
合規資訊
The supplied verified data does not state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status for OPA37GU. These fields remain unknown rather than being inferred.