LM2902Q4T - 1.3 MHz Quad Op Amp | STMicroelectronics
부품 번호: LM2902Q4T ✓ 활성LM2902Q4T 개요
An operational amplifier, or op amp, is an analog integrated circuit that amplifies the voltage difference between its inverting and non-inverting inputs. A quad op amp combines four amplifiers in one package, allowing a PCB to implement multiple signal-conditioning, comparison, filtering, or buffering functions while reducing package count. This device belongs to the operational-amplifier hierarchy within linear and analog integrated circuits.
Key specifications include a gain-bandwidth product of 1.3 MHz, slew rate of 0.4 V/µs, large-signal voltage gain of 100 dB, and supply current of 375 µA per amplifier. Its input common-mode voltage range includes the negative supply rail, making it useful in single-supply circuits where signals approach ground. The 3 V to 30 V operating range also supports conventional industrial supply levels.
The LM2902Q4T uses a bipolar operational-amplifier architecture designed for general-purpose precision and control applications. Each amplifier has two inputs, an output, and power connections shared with the other three channels. The 100 dB open-loop gain supports closed-loop gains from unity through inverting or non-inverting configurations, while the 1.3 MHz bandwidth limits the frequency range of high-gain stages.
Typical uses include low-frequency sensor conditioning, transducer amplification, active filtering, analog signal buffering, power-supply feedback loops, and general instrumentation. In a 3 V single-supply system, the common-mode input range extending to the negative rail helps preserve signal integrity near ground. In dual-supply systems, the 30 V maximum supply supports ±15 V rails.
PCB design should prioritize short feedback paths, short output routing, and stable return connections. Place input and feedback components close to the associated amplifier pins, use a common ground plane, and connect the exposed pad to a low-impedance thermal and ground plane according to the package land pattern. Decoupling capacitors should be positioned near the power pins.
This product resource combines electrical characteristics, package details, application guidance, design notes, and cross-reference information. The comparisons also distinguish the quad op amp from nearby comparator and alternate-package LM2902-family devices, helping engineers verify footprint, function, and electrical requirements before assigning a replacement.
드롭인 대체품: LM2902Q4T — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 제품에는 사용 가능한 드롭인 대체품이 없습니다.
대체품 요청LM2902Q4T 최대 정격 & 전기적 특성
| Number of Amplifier Circuits | 4 circuits |
| Amplifier Type | General Purpose |
| 출력 유형 | Push-Pull |
| Architecture | Bipolar operational amplifier |
| Supply Voltage Range | 3 V to 30 V |
| Dual-Supply Configuration | ±15 V |
| Gain-Bandwidth Product | 1.3 MHz |
| Slew Rate | 0.4 V/µs |
| Large-Signal Voltage Gain | 100 dB |
| Supply Current per Amplifier | 375 µA |
| Input Common-Mode Range | Includes the negative supply rail |
| 패키지 | 16-QFN (3 mm × 3 mm) |
| Package Type | 16-VFQFN with exposed pad |
| 실장 유형 | Surface mount |
| Shipping Packaging | Tape and reel |
LM2902Q4T 16-vfqfn with exposed pad 핀 구성 가이드
LM2902Q4T(16-vfqfn with exposed pad 패키지)의 핀 구성입니다. 이 아날로그 부품에는 입력, 출력, 전원 공급 핀이 있습니다. 오프셋 널, 보상, 인에이블 핀 구성은 제조사 데이터시트를 참조하십시오. 신호 컨디셔닝 및 증폭기 회로에 이상적입니다.
다음에 대한 상세 핀아웃 데이터 없음: LM2902Q4T.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
LM2902Q4T 적합 용도: 6 애플리케이션s: Industrial Sensor Conditioning, Active Filtering and Gain Stages, Power-Supply Feedback Control, Portable Instrumentation, Analog Signal Buffering, General-Purpose Control Loops.
Industrial Sensor Conditioning
The LM2902Q4T fits low-frequency industrial sensor front ends requiring several amplified signals from a compact analog circuit. Its 1.3 MHz gain-bandwidth product supports moderate closed-loop gains, while the 100 dB large-signal voltage gain provides useful open-loop capability for amplifier design. The input common-mode range includes the negative rail, which helps process signals near ground in 3 V single-supply systems. Four independent channels can condition multiple sensor outputs or combine amplification with filtering and buffering. The exposed thermal pad should be connected to a low-impedance ground plane, and decoupling should be placed close to the supply pins. Confirm the sensor excitation range, required accuracy, operating temperature, and protection requirements during design validation.
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Active Filtering and Gain Stages
The LM2902Q4T is useful in active-filter and analog gain networks operating below its 1.3 MHz unity-gain bandwidth. Its 0.4 V/µs slew rate helps preserve large-signal behavior in higher-gain stages, and the four-channel configuration allows a filter, preamplifier, and output buffer to share one package. Feedback components should be positioned close to the inverting-input pins to reduce parasitic feedback and oscillation risk. Check the closed-loop gain-bandwidth relationship at the highest operating frequency, because gain reduces usable bandwidth. The negative-rail-inclusive common-mode range is particularly helpful in 3 V systems that process small signals around ground. Validate stability, output swing, and distortion against the actual filter response.
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Power-Supply Feedback Control
The LM2902Q4T can implement voltage-feedback control loops in low-frequency power-supply and regulator designs. Its 100 dB large-signal voltage gain helps develop error-correction gain, while the 3 V to 30 V operating range accommodates conventional analog control rails. The 375 µA typical current per amplifier is useful where control circuitry must limit overhead. Compensation components and the feedback divider should be placed close to the amplifier to minimize loop delay and instability. The 1.3 MHz bandwidth makes the device more appropriate for slow regulation loops than high-bandwidth switch-mode compensation. Designers should also verify output-current capability, saturation behavior, and stability across input-voltage and load extremes.
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Portable Instrumentation
The LM2902Q4T supports portable measurement and instrumentation designs that need multiple analog channels without allocating four separate amplifier packages. The typical 375 µA supply current per amplifier reduces the demand of the op-amp portion of the power budget, and the 3 V minimum supply is compatible with low-energy system rails. The 16-QFN 3 mm × 3 mm package saves board area, although the exposed pad requires careful thermal-plane design. Signal inputs should remain within the common-mode limits over the complete battery range. Engineers should assess offset, input bias current, noise, and drift against the measurement resolution rather than relying only on bandwidth and supply-current figures.
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Analog Signal Buffering
Each LM2902Q4T amplifier can provide unity-gain buffering when driving downstream ADC inputs, instrumentation stages, or long PCB traces. A 1.3 MHz gain-bandwidth product is adequate for many low-bandwidth sensor and measurement paths, while the push-pull output supports source and sink current within the load limits of the device. Use short traces, a continuous reference plane, and separate input and output return paths to reduce coupling. The common-mode input range including the negative rail makes the device suitable for buffering signals referenced to ground in 3 V systems. Confirm the downstream input capacitance and required settling time, because excessive capacitive loading can reduce stability and alter effective bandwidth.
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General-Purpose Control Loops
The LM2902Q4T is suitable for general-purpose control and feedback functions where a low-frequency error amplifier must operate from a 3 V to 30 V supply. Four channels can support an outer control loop, a signal amplifier, a comparator-like threshold stage using suitable feedback, and an output buffer. Its 100 dB large-signal gain provides the headroom needed for moderate loop gain, but compensation must preserve stability under the expected load and capacitance. Keep the high-impedance feedback node compact, isolate output routing from input nodes, and connect the exposed pad to a solid ground plane. Validate startup, saturation, and recovery behavior for bipolar supply operation and for single-supply circuits whose signals approach the lower rail.
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추천 제품 요약
엔지니어링 참조 데이터: LM2902Q4T — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
Do not choose it for precision measurement chains requiring unusually low offset, noise, or drift unless those characteristics are verified against the required error budget. A dedicated precision amplifier may also be preferable when the signal bandwidth is very low but accuracy dominates. The LM2901Q4T is not an amplifier substitute because it is a comparator, while LM2902MX/NOPB and LM2902DR2G require different PCB footprints. For an exact physical replacement, verify the pin definition, exposed-pad connection, supply limits, stability, and electrical performance of a specifically qualified 16-QFN device.
대체품과의 비교
| 파라미터 | 이 제품 | LM2901Q4T | LM2902MX/NOPB | LM2902DR2G |
|---|---|---|---|---|
| Package | 16-QFN (3 mm × 3 mm) with exposed pad | QFN16 | 16-pin SOIC | SOIC-8 |
| Brand | STMicroelectronics | STMicroelectronics | Texas Instruments | onsemi |
| Device Function | Quad low-power operational amplifier | Low-power quad voltage comparator | Quad operational amplifier | Quad low-power operational amplifier |
| Number of Amplifier Circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits |
주요 차별점
- Combines four general-purpose amplifiers with a 30 V maximum supply (vs LM2901Q4T)
- Uses a compact 16-QFN exposed-pad footprint (vs LM2902MX/NOPB)
- Provides four amplifiers in a smaller package than the SOIC-8 alternative (vs LM2902DR2G)
설계 노트
Place input, feedback, and bypass components close to their associated LM2902Q4T pins. Keep the exposed-pad land connected to a low-impedance ground plane and use the manufacturer-recommended land pattern rather than substituting a generic QFN footprint. Route outputs away from high-impedance input and feedback nodes to reduce capacitive coupling. A continuous ground plane beneath the device also improves heat transfer from the exposed pad.
Treat each amplifier channel as a separate analog path even though all four share supply pins. Keep channel grounds and feedback routing compact, and avoid sharing narrow return paths between sensitive input channels and output or digital circuitry. When the common-mode input range includes the negative rail, connect the signal-source return to the same ground reference as the device; otherwise input bias current can shift the measured signal near ground.
Do not substitute a comparator or an LM2902-family device in another package as a direct replacement. LM2901Q4T is a comparator despite sharing the QFN16 format, while LM2902MX/NOPB and LM2902DR2G use different footprints. Also verify that the selected circuit does not require more bandwidth, precision, output swing, or load drive than the LM2902Q4T provides, since its 1.3 MHz bandwidth and general-purpose characteristics are not appropriate for every analog task.
Install local supply bypassing at the power pins and use a common ground plane for the four amplifier channels. The typical amplifier-array supply demand is approximately 1.5 mA when each channel operates at 375 µA, but total board current also includes load and feedback-network demand. Verify headroom across every operating mode and add a bulk capacitor only after checking its interaction with the required supply stability and control-loop behavior.
규정 준수 정보
Compliance status was not stated in the product records. Confirm RoHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive qualification status with the manufacturer for the exact production configuration.
