MC33171N - 2.1MHz Low-Power Op Amp | STMicroelectronics
MPN： MC33171N ✓ 啟用中MC33171N 概覽
An operational amplifier is an analog integrated circuit that uses high open-loop gain to amplify differences between two input voltages. The bipolar MC33171N belongs to the operational-amplifier, analog-IC, and semiconductor hierarchy. Its rail-to-rail input common-mode capability is particularly useful in single-supply systems because the input signal can approach the lower supply rail without requiring a negative power source.
The principal features are a 2.1 MHz gain-bandwidth product, a 2 V/us slew rate, and a typical supply current of 200 uA. The 2.1 MHz bandwidth provides useful bandwidth for general-purpose analog stages, while the 2 V/us slew rate limits how quickly the output can follow large voltage changes. Low 200 uA consumption supports battery-powered and distributed instrumentation designs where amplifier power can dominate the system budget.
The MC33171N uses a single bipolar amplifier architecture rather than a JFET-input implementation. This architecture combines low supply consumption with moderate operating speed and makes the device appropriate for continuous analog signal processing without the static bias current associated with higher-performance precision amplifiers. Its 4 V to 44 V single-supply range allows operation from conventional 5 V and 12 V rails as well as higher industrial supply voltages.
Typical applications include low-frequency instrumentation amplifiers, current-sensor signal conditioning, buffered sensor outputs, industrial control inputs, and low-power analog measurement systems. The input common-mode range extending to the lower rail is valuable in systems powered from a single positive supply, where input signals can be close to ground. Gain and bandwidth should be selected together so that the closed-loop noise gain remains compatible with the 2.1 MHz gain-bandwidth product.
A key design consideration is the relationship between supply voltage, output swing, and input range. Confirm that the required signal and output remain inside the operating limits before assigning a high closed-loop gain. Keep feedback routing short, place input and supply bypass capacitors close to their relevant pins, and avoid extending high-impedance input traces where leakage and interference can degrade accuracy.
This product page combines the STMicroelectronics MC33171 operating characteristics with package guidance, pin assignments, application analysis, verified drop-in alternatives, and practical circuit-design notes. It is intended to help engineers select the amplifier, confirm footprint compatibility, and plan an efficient single-supply analog implementation.
直接替換替代品，適用於 MC33171N — 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。
UA741CP
✅ 直接替換📋 參考替代品（不在目錄中）
MC33171N 最大額定值與電氣特性
| Amplifier Type | Single bipolar operational amplifier |
| Number of Channels | 1 channel |
| Gain-Bandwidth Product | 2.1 MHz |
| Slew Rate | 2 V/us |
| 供應電流 | 200 uA |
| Single-Supply Operating Voltage Range | 4 V to 44 V |
| Input Common-Mode Range | Extends to the lower supply rail |
| Input Transistor Technology | Bipolar |
| Circuit Count | 1 circuit |
| Device Class | Standard general-purpose amplifier |
| 封裝 | DIP-8 |
| Package Pin Count | 8 pins |
| 安裝類型 | Through-hole |
| Lead Pitch | 7.62 mm |
MC33171N 腳位配置
| 腳位 1 | NC — Not connected |
| 腳位 2 | IN- — Inverting input |
| 腳位 3 | IN+ — Non-inverting input |
| 腳位 4 | V- — Negative supply connection |
| 腳位 5 | NC — Offset null position not used in this configuration |
| 腳位 6 | OUT — Amplifier output |
| 腳位 7 | V+ — Positive supply connection |
| 腳位 8 | NC — Not connected |
典型應用
MC33171N 適用於 6 應用s: Industrial Sensor Signal Conditioning, Battery-Powered Measurement Front End, Process-Control Analog Input, Data-Acquisition Input Buffer, Audio and Communication Interface, Precision Bridge and Current-Sensing Amplifier.
Industrial Sensor Signal Conditioning
The MC33171N is appropriate for conditioning low-frequency industrial sensor signals because it combines a 2.1 MHz gain-bandwidth product with a 200 uA supply current. Place the amplifier in a non-inverting or differential stage between the sensor and an ADC, then confirm that the input remains within the common-mode range that extends to the lower supply rail. The 2 V/us slew rate supports reasonably fast signal changes, while the DIP-8 package simplifies through-hole assembly and serviceable industrial instrumentation.
推薦
Battery-Powered Measurement Front End
The MC33171N fits battery-powered measurement front ends because its supply current is only 200 uA while its gain-bandwidth product remains 2.1 MHz. Use it to amplify a sensor output close to ground under a single positive supply, taking advantage of the input common-mode range that extends to the lower rail. The low 200 uA demand helps preserve battery life, although the complete front end should be evaluated for sensor bias current, leakage, and the amplifier's quiescent contribution.
推薦
Process-Control Analog Input
The MC33171N can amplify process-control signals in industrial systems requiring a general-purpose bipolar amplifier with moderate speed. Its 2.1 MHz gain-bandwidth product supports closed-loop gains below the level where bandwidth limitations dominate, and the 2 V/us slew rate handles practical signal slopes. The 4 V to 44 V single-supply range supports conventional control rails, while the lower-rail input range helps with sensors whose idle voltage is close to ground.
推薦
Data-Acquisition Input Buffer
The MC33171N serves as an input buffer or gain stage in a data-acquisition system where a 2.1 MHz bandwidth and 2 V/us slew rate provide adequate dynamic range for moderate-frequency measurements. Buffering reduces loading of the source and allows a single-supply implementation with inputs near the lower rail. Select resistor values for the intended closed-loop gain, keep the input impedance compatible with the source, and confirm output swing before the analog signal reaches the converter.
推薦
Audio and Communication Interface
The MC33171N can provide low-level signal conditioning in audio and communication interfaces when full rail-to-rail precision is unnecessary. Its 2.1 MHz gain-bandwidth product supports audio-band amplification, and the 2 V/us slew rate provides useful slew capability for moderate-level waveforms. Operation from 4 V to 44 V supports several legacy analog rails, while the lower-rail input range is useful for audio signals that remain close to the supply reference.
推薦
Precision Bridge and Current-Sensing Amplifier
The MC33171N is suitable for modest bridge or current-sense amplification when the required bandwidth is below its 2.1 MHz gain-bandwidth capability and the output swing remains within its limits. Its bipolar input stage supports conventional instrumentation arrangements, and the 200 uA supply current keeps power demand controlled. For high-resolution ratiometric measurements, verify input offset and bias-current limits in the datasheet and consider a dedicated instrumentation amplifier when bridge excitation requires greater common-mode control.
推薦
推薦產品摘要
工程參考資料，適用於 MC33171N — 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 | UA741CP |
|---|---|---|
| Package | DIP-8 | DIP-8 |
| Brand | STMicroelectronics | Texas Instruments |
| Amplifier Type | Single bipolar operational amplifier | General-purpose operational amplifier |
| Number of Channels | 1 channel | 1 channel |
主要差異化特點
- Lower-rail input common-mode capability (對比UA741CP)
- Specified low-power operation (對比UA741CP)
- Practical moderate-speed performance (對比UA741CP)
設計說明
Operate the MC33171N from a single supply within the documented 4 V to 44 V range. Because the input common-mode range reaches the lower supply rail, circuits with near-ground inputs can use a positive-only supply, but the output swing remains a separate constraint. Place the supply bypass capacitor close to pin 7, connect pin 4 to the ground reference with a short return path, and follow the manufacturer layout recommendations.
Keep the inverting-input feedback route short and use a compact resistor network around pins 2, 3, and 6. Avoid routing the high-impedance non-inverting input beside switching or digital return paths. For a closed-loop gain G, the signal bandwidth will be limited by the 2.1 MHz gain-bandwidth product, while large output transitions must also remain compatible with the 2 V/us slew rate.
Do not treat the lower-rail input common-mode specification as permission for the output to swing rail to rail. Check maximum and minimum output voltage, input common-mode limits, and load current under the intended supply voltage. When replacing MC33171N with the UA741CP, review offset voltage, bias current, bandwidth, slew rate, output swing, and supply range rather than relying only on the DIP-8 footprint.
合規資訊
No specific RoHS, REACH, halogen-free, or conflict-minerals statements are included in the manufacturer and distributor information for this MPN.
