MCP618-I/SN - 190 kHz Micropower Op Amp | Microchip
부품 번호: MCP618-I/SN ✓ 활성MCP618-I/SN 개요
An operational amplifier, commonly called an op amp, is an analog integrated circuit that uses high open-loop gain to amplify differences between two input voltages. The MCP618 belongs to the micropower amplifier hierarchy, combining low operating current with a gain-bandwidth product suitable for low-frequency signal conditioning. Its rail-to-rail inputs support signals near either supply rail, while rail-to-rail outputs improve dynamic range in low-voltage systems.
The principal features of the MCP618-I/SN include a 190 kHz gain-bandwidth product, 19 µA typical operating current, offset voltage below 150 µV, and a 2.3 V to 5.5 V supply range. The device is available in an 8-pin SOIC package, providing a conventional surface-mount footprint for compact analog and mixed-signal equipment. Its micropower operating current is particularly useful in portable instrumentation and other systems where continuous analog amplification must consume little energy.
The MCP618 uses Bi-CMOS input circuitry and provides rail-to-rail input and output operation. Its 190 kHz gain-bandwidth product is adequate for low-frequency amplification, filtering, buffering, and general-purpose analog signal conditioning rather than high-speed waveform or communications channels. The less-than-150 µV typical input offset supports precision-oriented operation when combined with suitable resistor networks and careful layout.
Typical applications include battery-powered sensor interfaces, portable medical and industrial measurement equipment, low-frequency active filters, audio preamplification, and general-purpose analog buffers. The chip-select feature visible in the MCP618 family documentation also makes the amplifier suitable for systems that require an active-low or controlled operating state, subject to the connection details in the manufacturer datasheet.
Designers should provide stable supply decoupling, route sensitive input and feedback paths away from switching nodes, and account for input common-mode range, output swing, noise, and bias current. The 8-SOIC footprint requires adequate copper for thermal dissipation, although the low 19 µA typical operating current generally limits self-heating in low-power applications.
This page combines the manufacturer-family operating characteristics, package information, verified drop-in alternatives, comparative electrical parameters, and practical implementation guidance. It also identifies where application-specific values must be checked in the MCP618 datasheet before a design is released for production.
드롭인 대체품: MCP618-I/SN — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
MCP618T-I/SN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MCP616T-I/SN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MCP616-I/SN
✅ 드롭인가격 문의
데이터시트 보기 →MCP617-I/SN
✅ 드롭인가격 문의
데이터시트 보기 →MCP6291-E/SN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MCP618-I/SN 최대 정격 & 전기적 특성
| Amplifier Type | Single operational amplifier |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Gain-Bandwidth Product | 190 kHz |
| Typical Operating Current | 19 µA |
| Typical Input Offset Voltage | Less than 150 µV |
| Input Common-Mode Range | Rail-to-rail |
| Output Swing | Rail-to-rail |
| Input Circuitry | Bi-CMOS |
| Chip Select | Yes |
| Number of Channels | 1 circuit |
| 패키지 | 8-pin SOIC |
| 실장 유형 | Surface mount |
MCP618-I/SN 핀 구성
| 핀 1 | NC — Not connected (per datasheet) |
| 핀 2 | IN- — Inverting input |
| 핀 3 | IN+ — Non-inverting input |
| 핀 4 | V- — Negative supply |
| 핀 5 | CS — Chip select |
| 핀 6 | OUT — Analog output |
| 핀 7 | V+ — Positive supply |
| 핀 8 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
MCP618-I/SN 적합 용도: 6 애플리케이션s: Battery-Powered Sensor Signal Conditioning, Portable Medical Monitoring, Low-Frequency Active Filtering, Industrial Process Measurement, Low-Power Audio Preamp, Portable Data Acquisition.
Battery-Powered Sensor Signal Conditioning
The MCP618-I/SN fits battery-powered sensor interfaces because it operates from 2.3 V to 5.5 V while drawing only 19 µA typical operating current. Place it in a non-inverting or differential amplifier stage to raise a sensor output to a level suitable for an ADC or comparator. Rail-to-rail inputs help preserve usable signal range near the supply rails, and rail-to-rail outputs improve headroom on low-voltage rails. Check the sensor output range against the input common-mode limits, and select resistor values so closed-loop bandwidth remains suitable for the 190 kHz gain-bandwidth product.
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Portable Medical Monitoring
The MCP618-I/SN can provide low-power amplification for portable medical monitoring when the selected system rail remains within 2.3 V to 5.5 V. Its 19 µA typical operating current reduces the amplifier’s contribution to continuous battery drain, while the typical input offset below 150 µV is useful for conditioning low-level physiological sensor signals. The device is placed between the sensor and an ADC or analog front end, with feedback resistors setting the gain. Designers must verify the required medical qualification, input noise, isolation strategy, and electrode-specific safety requirements separately; the amplifier qualification status itself is not established by the product family description.
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Low-Frequency Active Filtering
The MCP618-I/SN is suitable for first-stage active filtering in low-frequency sensor and measurement systems. With a 190 kHz gain-bandwidth product, the amplifier can implement practical low-pass, high-pass, or buffered filter stages when the closed-loop bandwidth is kept below the device’s stability limits. Its 19 µA typical operating current supports compact, low-energy instrumentation, while rail-to-rail output swing allows stronger filtering of signals near the lower supply rail. Select feedback and balancing resistors according to the desired pole and quality factor, then verify capacitor tolerances, noise, and phase margin in the final circuit.
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Industrial Process Measurement
The MCP618-I/SN can condition low-level signals from industrial sensors when the process interface operates on a 2.3 V to 5.5 V rail. The 190 kHz gain-bandwidth product is appropriate for slow process variables such as temperature, pressure, or position rather than high-speed communications. Place the amplifier between the sensor and an ADC, using a high-impedance input stage to limit sensor loading. The 19 µA typical operating current is useful when the interface must operate continuously, but grounding, shielding, transient protection, and input filtering should be designed for the industrial environment rather than inferred from the amplifier specifications alone.
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Low-Power Audio Preamp
The MCP618-I/SN can serve as a low-power preamplifier for low-frequency audio or microphone signals when supply and output swing requirements fit the device. Its rail-to-rail input and output characteristics improve signal utilization in a 2.3 V to 5.5 V system, while the 190 kHz gain-bandwidth product covers the audio band and limited guard margin. The 19 µA typical operating current supports long-duration portable operation. Keep the gain-bandwidth product in mind for bass and treble shaping, check input-noise requirements for microphone work, and verify that the selected chip-select state leaves the amplifier operating normally.
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Portable Data Acquisition
The MCP618-I/SN is applicable to compact data-acquisition front ends that sample slow analog signals from a 2.3 V to 5.5 V supply. Place the amplifier in front of an ADC to provide gain or differential conversion without introducing appreciable quiescent-current demand; its 19 µA typical operating current is a useful starting point for battery budget calculations. The 190 kHz gain-bandwidth product supports low-frequency acquisition rather than high-speed waveform capture. Choose the closed-loop gain carefully, confirm ADC input range, and verify that the amplifier’s offset, noise, settling behavior, and chip-select timing meet the measurement specification.
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추천 제품 요약
엔지니어링 참조 데이터: MCP618-I/SN — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MCP618T-I/SN | MCP616T-I/SN | MCP616-I/SN | MCP617-I/SN | MCP6291-E/SN |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Supply Voltage Range | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 1.8 V to 5.5 V |
| Number of Channels | 1 circuit | 1 circuit | 1 circuit | 1 circuit | 1 circuit | 1 circuit |
주요 차별점
- Combines micropower operation with a 190 kHz gain-bandwidth product (vs MCP616-I/SN)
- Retains chip-select control (vs MCP616T-I/SN)
- Allows operation down to 1.8 V (vs MCP618-I/SN)
설계 노트
Place the input bypass capacitor and the amplifier supply connection close to pins 7 and 4 of the 8-pin SOIC. Keep the OUT connection at pin 6 away from clock, switching, and high-current return paths. Because rail-to-rail input and output behavior gives useful signal range near the supply limits, inadequate supply decoupling can consume that margin through transient ground bounce.
Route the IN− and IN+ paths together and minimize their exposed length, especially when amplifying microvolt-level sensor signals. Place high-value feedback resistors close to the input and inverting pins to reduce parasitic capacitance and leakage sensitivity. Connect the two NC terminals, pins 1 and 8, as unused pins and verify the orientation using the package drawing rather than relying only on the schematic symbol.
Do not substitute an amplifier solely because it fits an 8-pin SOIC footprint. Confirm the 2.3 V to 5.5 V operating range, input common-mode behavior, output swing, gain-bandwidth product, offset, noise, and chip-select state. The MCP616-family options omit the MCP618 chip-select feature, while MCP6291-E/SN changes the minimum supply voltage, so either change can alter system behavior.
The 190 kHz gain-bandwidth product limits practical closed-loop bandwidth and affects phase margin. Avoid operating the amplifier as a high-gain comparator, and check feedback-network impedance and parasitic capacitance. For filters or sensor amplifiers, calculate the closed-loop bandwidth at the intended noise gain and confirm settling time separately if the downstream ADC samples the output.
규정 준수 정보
Compliance and automotive-qualification declarations are not established by the available product-family information. Verify the current declarations on the manufacturer product page before production release.