LM2902Q4T - 1.3 MHz Quad Op Amp | STMicroelectronics
MPN： LM2902Q4T ✓ 啟用中LM2902Q4T 概覽
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.
直接替換替代品，適用於 LM2902Q4T — 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LM2902Q4T 最大額定值與電氣特性
| Number of Amplifier Circuits | 4 circuits |
| Amplifier Type | General Purpose |
| 輸出類型 | 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 |
| 封裝 | 16-QFN (3 mm × 3 mm) |
| Package Type | 16-VFQFN with exposed pad |
| 安裝類型 | Surface mount |
| Shipping Packaging | Tape and reel |
LM2902Q4T 16-vfqfn with exposed pad 腳位配置指南
LM2902Q4T（16-vfqfn with exposed pad 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： LM2902Q4T.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM2902Q4T 適用於 6 應用s: 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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推薦產品摘要
工程參考資料，適用於 LM2902Q4T — 比較、設計指引及合規資訊。
選型指南
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.
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Combines four general-purpose amplifiers with a 30 V maximum supply (對比LM2901Q4T)
- Uses a compact 16-QFN exposed-pad footprint (對比LM2902MX/NOPB)
- Provides four amplifiers in a smaller package than the SOIC-8 alternative (對比LM2902DR2G)
設計說明
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.
合規資訊
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.
