OPA2137U - Dual 36V 1MHz J-FET Op Amp | Texas Instruments
MPN： OPA2137U ✓ 啟用中OPA2137U 概覽
A J-FET-input operational amplifier is a voltage-amplifier device whose field-effect transistor input stage provides very low input bias current. Within the broader semiconductor hierarchy, the OPA2137U belongs to the operational-amplifier family of analog ICs and supports low-impedance sensing, precision feedback networks, signal conditioning, and general-purpose analog signal paths. Unlike bipolar-input amplifiers, its J-FET inputs place minimal DC current on high-impedance sources.
The OPA2137 series is designed for low-cost and miniature applications. Important characteristics include a ±10 pA input bias current, 120 µA per channel of quiescent current, and 145 dB open-loop gain. The dual configuration provides two amplifiers in one package while maintaining identical performance between channels, making it convenient for differential, active-filter, instrumentation, and buffer circuits.
The device operates across a total supply range of ±2.25 V to ±18 V, equivalent to 4.5 V to 36 V across the supply terminals. Its 1 MHz gain-bandwidth product and 3.5 V/µs slew rate provide useful bandwidth for audio-frequency and low-frequency instrumentation applications. The input common-mode range includes the positive supply, allowing the amplifier to operate from a single supply when appropriately configured.
Typical applications include low-level signal conditioning, buffered sensor outputs, audio preamplification, active filters, sample-and-hold circuitry, and precision analog measurement systems. The low bias current is particularly valuable when driving high-impedance detectors, transducers, or measurement nodes, while the low per-channel quiescent current supports compact and power-sensitive instruments.
Designers should verify the complete input and output common-mode ranges, input bias-current behavior, output swing, and stability requirements against the manufacturer datasheet for the selected supply and load conditions. Decoupling capacitors should be placed close to the supply pins, and sensitive input nodes should use short traces, guarded routing, and a clean ground reference to minimize leakage and interference.
This page combines manufacturer specifications, package and lifecycle information, drop-in replacement candidates, application guidance, and engineering design notes. It is intended to help designers compare the OPA2137U with same-footprint alternatives while selecting a part that matches the required bandwidth, supply voltage, input impedance, and environmental conditions.
直接替換替代品，適用於 OPA2137U — 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。
OPA2990
✅ 直接替換📋 參考替代品（不在目錄中）
OPA2137UA
✅ 直接替換📋 參考替代品（不在目錄中）
OPA2137U 最大額定值與電氣特性
| Product Type | Dual J-FET-input operational amplifier |
| Number of Amplifier Channels | 2 channels |
| Gain-Bandwidth Product | 1 MHz |
| Slew Rate | 3.5 V/µs |
| Maximum Total Supply Voltage | 36 V |
| Supply Voltage Range | ±2.25 V to ±18 V |
| Input Bias Current | ±10 pA |
| 靜態電流 | 120 µA per channel |
| Open-Loop Gain | 145 dB |
| Input Common-Mode Range | Includes the positive supply |
| 工作溫度範圍 | -40 °C to +85 °C |
| 封裝 | 8-pin SOIC (D) |
| 腳位數 | 8 pins |
| 安裝類型 | Surface mount |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
OPA2137U 腳位配置
| 腳位 1 | OUTA — Amplifier A output |
| 腳位 2 | INA- — Amplifier A inverting input |
| 腳位 3 | INA+ — Amplifier A non-inverting input |
| 腳位 4 | V- — Negative supply connection |
| 腳位 5 | INB+ — Amplifier B non-inverting input |
| 腳位 6 | INB- — Amplifier B inverting input |
| 腳位 7 | OUTB — Amplifier B output |
| 腳位 8 | V+ — Positive supply connection |
典型應用
OPA2137U 適用於 6 應用s: High-Impedance Sensor Signal Conditioning, Precision Active Filters, Audio Preamplification, Industrial Data Acquisition, Buffering and Level Conditioning, Portable Test and Measurement.
High-Impedance Sensor Signal Conditioning
The OPA2137U is well suited to conditioning signals from high-impedance sensors because each J-FET input channel has a specified bias current of ±10 pA. Place one amplifier in a non-inverting configuration and use the second channel for filtering or additional gain. This arrangement limits source loading while the 1 MHz gain-bandwidth product provides bandwidth for moderate-frequency measurement nodes. The 120 µA per-channel quiescent current also supports compact, low-power measurement equipment.
推薦
Precision Active Filters
The OPA2137U supports second-order active-filter implementations using its two matched amplifier channels. Its 145 dB open-loop gain helps reduce closed-loop gain error, while the 3.5 V/µs slew rate supports dynamic signals within the filter bandwidth. The J-FET input stage is useful when filter nodes connect to high-impedance sources. Component tolerances and the amplifier’s noise and open-loop response should be included in the filter error and stability analysis.
推薦
Audio Preamplification
The OPA2137U can provide low-level audio preamplification with 1 MHz gain-bandwidth product and 3.5 V/µs slew rate. Its ±10 pA input bias current places minimal DC load on high-impedance source devices, and the dual package allows separate channels for preamplification and output buffering. A design must verify output swing, distortion, noise, and stability for the selected load. The low 120 µA per-channel quiescent current also benefits portable audio equipment.
推薦
Industrial Data Acquisition
The OPA2137U provides two low-bias-current amplifier channels for conditioning sensor, divider, or instrumentation outputs in industrial data-acquisition systems. The ±2.25 V to ±18 V supply range accommodates multiple conventional analog rails, while 145 dB open-loop gain supports accurate closed-loop amplification. Use both channels for differential or referenced measurement paths. Protection, grounding, and input filtering remain important when external cables introduce transients or common-mode voltage.
推薦
Buffering and Level Conditioning
The OPA2137U can buffer a high-impedance source before it drives a sampling, display, or control circuit. The dual architecture supports one buffer channel and one gain or offset-conditioning channel, reducing the number of separate amplifier packages. Its ±10 pA bias current is especially helpful for source impedances that would create significant DC error with a bipolar-input amplifier. Output loading and capacitive stability must be checked when the load includes long PCB traces or cable capacitance.
推薦
Portable Test and Measurement
The OPA2137U fits portable test and measurement equipment where low input bias current, modest bandwidth, and low standby consumption are valuable. Its 120 µA per-channel quiescent current supports two analog channels without the current demand of a higher-bandwidth amplifier family. The 36 V maximum supply rating also permits operation on higher-voltage analog rails. Select external resistors and capacitors for the target accuracy, and account for input-referred noise when establishing the smallest measurable signal.
推薦
推薦產品摘要
工程參考資料，適用於 OPA2137U — 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 | OPA2990 | OPA2137UA |
|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Amplifier Configuration | Dual operational amplifier | Dual operational amplifier | Dual operational amplifier |
主要差異化特點
- Lower supply rating creates a meaningful distinction from the documented upgrade (對比OPA2990)
- Lower bandwidth can reduce unnecessary response and power in audio-frequency circuits (對比OPA2990)
- Same-family suffix option retains the original OPA2137 electrical positioning (對比OPA2137UA)
設計說明
Place the supply-decoupling network immediately between pins 4 and 8, with the shortest possible ground return and the smallest practical loop area. Route sensitive inputs on the opposite side of the package from switching or high-current circuitry. The OPA2137U's ±10 pA input bias current reduces DC loading, but PCB contamination can still create much larger leakage paths, so clean boards and guarded input traces remain important.
Do not assume that the ±10 pA input bias current guarantees operation beyond the input common-mode range. The input common-mode range includes the positive supply, but output swing and supply limits must also be respected. Check the required signal amplitude and bias points against the manufacturer data sheet for the selected supply. For single-supply designs, establish the signal reference before assigning the non-inverting input.
The 3.5 V/µs slew rate and 1 MHz gain-bandwidth product make OPA2137U appropriate for many low- and mid-frequency analog paths, but they do not guarantee stability with every load. Keep feedback loops compact, avoid placing large capacitive loads directly on the output, and add an isolation resistor if the next stage presents significant capacitance. Evaluate the complete gain, bandwidth, and stability specification against the required signal bandwidth.
Estimated: at an 18 V total supply, the two amplifier channels draw 240 µA because 120 µA per channel multiplied by two channels equals 240 µA. The corresponding quiescent supply power is 4.32 mW, calculated as 18 V multiplied by 240 µA. This estimate excludes output-current dissipation and load-dependent supply current; add those terms when calculating total system power.
合規資訊
The manufacturer product and ordering pages were identified, but explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals declarations were not included in the technical excerpts. Confirm current declarations with Texas Instruments before production release.
