MC33172N - Dual 44V Low-Power Op Amp | STMicroelectronics
MPN： MC33172N ✓ 啟用中MC33172N 概覽
An operational amplifier is an analog signal-processing IC that amplifies the voltage difference between its two inputs while using feedback to control gain, bandwidth, and output behavior. The dual-amplifier configuration places two independent amplifiers in one package, reducing board area in audio, instrumentation, industrial control, and sensor-interface circuits. MC33172N belongs to the bipolar operational-amplifier family within the broader voltage-regulator-free analog IC and semiconductor hierarchy.
The headline electrical characteristics are its dual-amplifier architecture, 2.1 MHz gain-bandwidth product, 2 V/µs slew rate, and low supply current of approximately 200 µA per amplifier. These specifications make the device suitable for signals that require more bandwidth than a micropower-only amplifier but do not demand the very high speed or rail-to-rail performance of newer CMOS families. Its wide supply range also allows operation from conventional ±15 V and ±22 V analog rails.
The MC3x172 series uses a bipolar input and output architecture rather than JFET input. This family construction supports operation from very low positive supplies through relatively high industrial voltage rails. Because the amplifiers are specified for both single- and dual-supply operation, the same device can be used in grounded single-supply designs, where the signal is biased around the midpoint of the supply, or in conventional dual-rail systems.
Typical applications include low-frequency audio amplification, instrumentation-amplifier input stages, industrial sensor buffers, general-purpose signal conditioning, and power-supply feedback or monitoring circuits. The 8-pin PDIP package is mechanically straightforward for through-hole assembly and prototype work. The relatively low 200 µA-per-amplifier supply current is particularly useful when each active channel must remain powered continuously within a multi-channel measurement system.
The principal design consideration is common-mode and output-range behavior. Designers should calculate signal swing, input bias requirements, and the effect of load current before fixing external resistor values. Because this is a bipolar amplifier rather than a rail-to-rail CMOS amplifier, input and output headroom must be checked against the selected supply voltage. Stable operation also depends on correct feedback topology and suitable output-load isolation.
This product page combines the manufacturer datasheet with practical guidance for supply selection, signal conditioning, PCB implementation, and replacement assessment. It also distinguishes true pin-and-footprint-compatible options from broader functional equivalents so engineers can make a replacement decision without treating a similar amplifier as an automatic drop-in substitute.
直接替換替代品，適用於 MC33172N — 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。
此產品無可直接替換的替代品。
申請替代品MC33172N 最大額定值與電氣特性
| Amplifier Type | Dual general-purpose operational amplifier |
| Number of Amplifiers | 2 circuits |
| Transistor Technology | Bipolar |
| Single-Supply Operating Range | +4 V to +44 V |
| Dual-Supply Operating Range | ±2 V to ±22 V |
| 供應電流 | 200 µA per amplifier |
| Gain-Bandwidth Product | 2.1 MHz |
| Slew Rate | 2 V/µs |
| 封裝 | PDIP-8 |
| Package Width | 7.62 mm (0.300 inch) |
| 安裝類型 | Through-hole |
MC33172N 7.62 mm (0.300 inch) 腳位配置指南
MC33172N（7.62 mm (0.300 inch) 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： MC33172N.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC33172N 適用於 6 應用s: Low-Frequency Audio Preamplification, Industrial Sensor Signal Conditioning, Precision Instrumentation Buffering, Power-Supply Feedback Monitoring, General-Purpose Dual-Channel Amplification, Data Acquisition Interface.
Low-Frequency Audio Preamplification
The MC33172N is suitable for low-frequency audio preamplification because each bipolar channel provides a 2.1 MHz gain-bandwidth product and 2 V/µs slew rate within a low-power package. Two independent amplifiers can handle left and right channels, or one channel plus a monitoring or feedback path, while consuming approximately 200 µA per amplifier. The ±2 V to ±22 V capability permits use with conventional dual audio rails. In a non-inverting stage, the gain is set by feedback resistors, so resistor tolerance directly affects channel matching. Because the MC33172N is not rail-to-rail, verify the input and output headroom across the full signal excursion. A grounded single-supply implementation would also require an appropriate signal-bias network to prevent negative input or output excursions.
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Industrial Sensor Signal Conditioning
The MC33172N fits industrial sensor-conditioning stages that need two channels, moderate bandwidth, and operation from relatively high analog supply rails. Its 2.1 MHz gain-bandwidth product is suitable for conditioning many sensor outputs, while the approximately 200 µA current per amplifier helps limit power demand in continuously monitored systems. The +4 V to +44 V supply range can simplify designs operating from +5 V, +12 V, +15 V, or +24 V rails. Each sensor channel can use the amplifier as a buffer or a gain stage, subject to the input common-mode range. Check sensor output voltage, source impedance, amplifier bias current, and allowable offset error before finalizing the gain. Stable operation near the supply rails requires careful bias selection because the bipolar input stage does not provide rail-to-rail input coverage.
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Precision Instrumentation Buffering
The MC33172N can serve as the input-buffer and gain stage of a general-purpose instrumentation system. Two amplifiers in one 8-pin PDIP package allow balanced-signal buffering or separate amplification of sensor and reference signals. The 2 V/µs slew rate supports moderate-frequency waveforms, while the 2.1 MHz gain-bandwidth product is adequate for many low-to-medium-bandwidth measurement paths. Its bipolar architecture and broad supply range are useful in laboratory equipment built around ±15 V rails. For instrumentation applications, calculate noise gain, common-mode error, offset drift, and resistor-network matching rather than relying only on bandwidth. Place the amplifier close to the high-impedance input to minimize parasitic capacitance and interference pickup. Add an output isolation resistor when driving capacitive loads that could reduce stability margin.
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Power-Supply Feedback Monitoring
The MC33172N is suitable for monitoring and feedback functions around higher-voltage power systems because it supports single supplies up to +44 V and dual supplies up to ±22 V. Two channels can monitor an output voltage and a reference or control signal, subject to the amplifier’s input common-mode limits. Its approximately 200 µA current per amplifier is useful for supervisory circuitry that cannot be switched off completely. The 2.1 MHz gain-bandwidth product is more than adequate for slow regulation-error signals and general supervisory waveforms. In a power-supply feedback path, ensure that the divider ratio keeps the amplifier input within its permitted range over startup, shutdown, and fault conditions. Provide adequate decoupling near the supply pins and maintain clean grounding so the feedback amplifier does not inject supply ripple into the control node.
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General-Purpose Dual-Channel Amplification
The MC33172N reduces board area in designs that require two separate general-purpose analog channels. The two amplifiers can amplify different sensor signals, form a noninverting and inverting pair, or implement a buffer plus active-filter stage. With a 2.1 MHz gain-bandwidth product and 2 V/µs slew rate, the device addresses low-frequency and moderate-bandwidth signals without the power envelope of a high-speed precision amplifier. Its dual bipolar implementation and broad supply compatibility are useful in educational, industrial-control, and legacy-system designs. Each channel requires its own feedback network, and the two channels do not automatically share offset or gain behavior. Use matched resistor networks when channel-to-channel matching matters. Check output current, capacitive-load stability, and the input bias-current error of each source before finalizing the circuit.
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Data Acquisition Interface
The MC33172N can provide analog gain and buffering ahead of a data-conversion system in laboratory and industrial instrumentation. Two channels can condition bipolar or differential-related signals before they reach an ADC, while the 2.1 MHz gain-bandwidth product supports many low-frequency measurement systems. The device’s ±2 V to ±22 V operating range is particularly useful when the acquisition electronics use conventional dual rails and the source signals are not rail-to-rail. Determine the required gain from the ADC input range and apply the manufacturer’s recommended feedback values. Keep the amplifier’s offset, bias-current, and common-mode contributions inside the acquisition error budget. Place input and feedback components away from digital clock and switching nodes, and use a short, grounded return path to limit common-mode pickup. The companion converter must preserve the bipolar signal through suitable scaling or level shifting.
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推薦產品摘要
工程參考資料，適用於 MC33172N — 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 |
|---|---|
| Brand | STMicroelectronics |
| Package | PDIP-8 |
| Number of Amplifiers | 2 circuits |
| Input Stage | Bipolar |
| Single-Supply Range | +4 V to +44 V |
| Dual-Supply Range | ±2 V to ±22 V |
| Supply Current per Amplifier | 200 µA |
| Gain-Bandwidth Product | 2.1 MHz |
| Slew Rate | 2 V/µs |
| Mounting Type | Through-hole |
主要差異化特點
- Wide operating supply range (對比TLV9302)
- Moderate bandwidth with low channel power (對比LM358)
- Two-channel integration in a through-hole package (對比UA741)
設計說明
Verify the signal path against the MC33172N input-common-mode and output-swing limits before using the amplifier near a supply rail. The device is bipolar rather than rail-to-rail, so a signal centered near ground may require dual supplies or a mid-supply bias network in a single-supply circuit. Also check whether the selected gain creates an output condition that exceeds the available output-current capability.
Place each amplifier’s feedback resistors and compensation-related components close to the corresponding IC pins to minimize parasitic capacitance and feedback-loop length. Keep the two channels physically separated when they carry high-impedance or widely different signals. Route the MC33172N ground connection directly to the circuit ground plane, and place supply-decoupling capacitance close to the supply terminals with a short, low-inductance return path.
Use the minimum practical feedback resistance to reduce bias-current-induced offset and thermal-noise contributions, but confirm that the amplifier can drive the resulting capacitive and resistive load. If the output drives a long cable, capacitive load, or isolation network, add a series output resistor and test stability with the complete output harness. Keep high-impedance input traces short and shield them from switching-node fields.
Estimated: at a nominal 5 µA input-bias condition, each input contributes 5 nA of error across a 1 MΩ source resistance, equivalent to 5 mV before amplifier offset is considered. Actual bias current and the resulting error must be taken from the manufacturer datasheet. Use a lower source resistance or bias compensation when the calculated error exceeds the signal budget.
合規資訊
The manufacturer datasheet identifies the package and electrical characteristics, but no explicit RoHS, REACH, halogen-free, or conflict-minerals declaration is stated in the cited product information.