LM2902KD - Quad 26V 1.2MHz Op Amp | Texas Instruments
MPN： LM2902KD ✓ 啟用中LM2902KD 概覽
An operational amplifier is a voltage-amplifying component whose open-loop gain is controlled by external feedback. In a closed-loop circuit, negative feedback establishes the actual gain and improves linearity, while the internal architecture provides high input impedance and low output impedance. The LM2902KD belongs to the operational-amplifier hierarchy within analog and mixed-signal semiconductors, combining four amplifier channels in one package to reduce board area and simplify multi-channel designs.
Key characteristics include four amplifier circuits, a 26 V maximum supply rating, a 1.2 MHz typical gain-bandwidth product, and 2 kV improved ESD protection. The listed input offset voltage is typically 3 mV, while typical input offset current is 2 nA. Typical supply-current drain is 0.8 mA per amplifier. These specifications make the device suitable for sensor interfaces, low-frequency signal conditioning, active filters, and industrial control applications where a robust, economical quad amplifier is preferred.
The LM2902 family uses internal frequency compensation, allowing operation as a unity-gain amplifier without external compensation components. Its common-mode input voltage range includes ground, which supports direct sensing of low-side signals near the lower rail. This characteristic is useful in battery-powered, transducer, and grounded-source systems where the input signal can approach the supply floor.
Typical applications include four-channel sensor conditioning, process-control instrumentation, current-loop receivers, audio preamplifier stages, active filters, and general buffer or gain stages. Because the device is specified for a 26 V maximum supply, it should not be treated as a 36 V part even though closely related LM2902B-family devices may support a wider supply range.
Designers should verify common-mode range, output swing, input bias behavior, and channel-to-channel variation against the exact operating conditions. Decoupling capacitors should be placed close to the supply pins, and unused amplifier channels should be configured according to the manufacturer’s stability recommendations rather than left with floating inputs.
This page organizes the LM2902KD electrical characteristics, package information, application guidance, verified source links, and documented drop-in alternatives for faster engineering selection. Use the manufacturer datasheet and pin-description table for final PCB routing, input/output assignment, and production-limit decisions.
直接替換替代品，適用於 LM2902KD — 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。
LM2902K
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM2902KV
✅ 直接替換📋 參考替代品（不在目錄中）
LM2902KDR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM2902KDB
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM2902KDBRE4
✅ 直接替換📋 參考替代品（不在目錄中）
LM2902KD 最大額定值與電氣特性
| Number of Amplifier Channels | 4 circuits |
| Amplifier Type | General-purpose operational amplifier |
| Maximum Supply Voltage | 26 V |
| Typical Gain-Bandwidth Product | 1.2 MHz |
| Improved ESD Protection | 2 kV |
| Typical Input Offset Voltage | 3 mV |
| Typical Input Offset Current | 2 nA |
| Typical Supply-Current Drain | 0.8 mA |
| Typical Input Bias Current | 20 nA |
| 工作溫度範圍 | -40 °C to +125 °C |
| Compensation | Internal frequency compensation |
| Common-Mode Input Range | Includes ground |
| 封裝 | 14-pin SOIC (D), 3.90 mm width |
| 安裝類型 | Surface mount |
| Product Family | LM2902K |
LM2902KD 14-pin soic (d), 3.90 mm width 腳位配置指南
LM2902KD（14-pin soic (d), 3.90 mm width 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： LM2902KD.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM2902KD 適用於 6 應用s: Industrial Sensor Signal Conditioning, Process Control Instrumentation, Current-Loop Receiver, Active Audio Preamplifier, Power-Supply Feedback and Monitoring, Data Acquisition Front End.
Industrial Sensor Signal Conditioning
The LM2902KD fits four-channel industrial sensor conditioning because it combines four internally compensated general-purpose amplifiers with a 26 V maximum supply and a common-mode input range that includes ground. Each channel can buffer a low-side sensor or amplify a small voltage before conversion by an ADC. Typical input offset voltage is 3 mV, so high-accuracy measurement designs must account for that error relative to the sensor signal. The 1.2 MHz typical gain-bandwidth product is adequate for many industrial process signals, while the 14-pin SOIC simplifies board partitioning. Use short input routes, place bypass capacitance near the supply pins, and configure unused channels according to the manufacturer’s stability guidance.
推薦
Process Control Instrumentation
The LM2902KD is well suited to process-control signal paths that operate from a supply compatible with the 26 V maximum rating. Its four channels can implement input buffers, gain stages, differential-to-single-ended conversion, and output-driver functions in a compact 14-pin SOIC. Internal frequency compensation simplifies unity-gain and standard inverting or non-inverting configurations. At 1.2 MHz typical gain-bandwidth product, the device supports low-bandwidth process signals rather than high-speed waveform work. Designers should check output swing under load and common-mode limits across the full control range. A short ground return and local supply decoupling are especially important when driving cables or connecting the amplifier to external transducers.
推薦
Current-Loop Receiver
The LM2902KD can serve as the active element in a 4–20 mA current-loop receiver when the application does not require a rail-to-rail input or unusually low offset. Its common-mode input range includes ground, which is valuable for grounded industrial transmitters, and the four channels can be allocated to sensing, filtering, or auxiliary signal conditioning. The typical 3 mV input offset voltage and 2 nA input offset current must be included in the receiver’s error budget. The 1.2 MHz typical gain-bandwidth product supports moderate loop bandwidth and filtering. Keep the input impedance high to avoid perturbing the current loop, and use low-value, stable feedback resistors when accurate gain and temperature behavior are required.
推薦
Active Audio Preamplifier
The LM2902KD can implement low-frequency audio preamplifier and mixing stages where a general-purpose quad amplifier is adequate. Four channels allow multiple gain or summing stages in one 14-pin SOIC, and internal compensation supports straightforward closed-loop operation. The 1.2 MHz typical gain-bandwidth product provides ample bandwidth for audio-band signals, while the 26 V maximum supply permits compatibility with higher-voltage analog rails when the operating point permits. Designers should examine output-current capability into the next stage, input bias error with source impedance, and output swing at the required signal level. Place the feedback network close to the device and route audio input traces away from switching nodes to minimize coupled noise.
推薦
Power-Supply Feedback and Monitoring
The LM2902KD is suitable for low-bandwidth power-supply monitoring, soft-start comparison, and feedback conditioning where the system uses a supply below the 26 V maximum rating. Its four channels can monitor several rails, amplify sensor signals, or implement overvoltage and undervoltage functions around a switching converter. The common-mode input range includes ground supports low-side voltage sensing, while the 3 mV typical offset must be considered when thresholds require millivolt precision. The 1.2 MHz bandwidth is generally adequate for slow supervisory loops but not for compensation of high-frequency converters. Keep sensing traces away from power inductors and use filtering at the amplifier input when ripple or switching edges could exceed the input common-mode range.
推薦
Data Acquisition Front End
The LM2902KD can form the analog front end of a multiplexed data-acquisition system when signal bandwidth is moderate and the supply remains within 26 V. Four channels can buffer sensor outputs, provide programmable gain, and drive an ADC input, reducing the need for separate single-amplifier packages. The 1.2 MHz typical gain-bandwidth product supports many low-to-moderate-frequency channels, while 3 mV typical input offset voltage may limit low-level precision. The common-mode range includes ground is advantageous for grounded sensors. Engineers should verify settling behavior, ADC drive requirements, channel multiplexing transients, and noise performance. Keep sensitive nodes compact and provide a clean ground reference to minimize conversion error.
推薦
推薦產品摘要
工程參考資料，適用於 LM2902KD — 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 | LM2902K | LM2902KV | LM2902KDR | LM2902KDB | LM2902KDBRE4 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOIC (D) | 14-SOIC (D) | 14-SOIC (D) | 14-SOIC (D) | 14-SOIC (D) | 14-SOIC (D) |
| Number of Amplifier Channels | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits |
| Maximum Supply Voltage | 26 V | 26 V | 30 V | 26 V | 26 V | 26 V |
| Typical Gain-Bandwidth Product | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.2 MHz |
| Improved ESD Protection | 2 kV | 2 kV | 2 kV | 2 kV | 2 kV | 2 kV |
主要差異化特點
- Four amplifiers in one 14-pin SOIC (對比Single-amplifier alternatives)
- Defined 26 V maximum supply for the original LM2902K family (對比LM2902KV)
- Improved electrostatic-discharge robustness (對比Classic legacy LM2902 implementations)
- Ground-inclusive common-mode input operation (對比Rail-to-rail input amplifiers)
設計說明
Place the supply-bypass capacitor as close as practical to the amplifier supply pins and use a short ground return. Keep the two amplifier inputs, especially high-impedance inputs, away from switching nodes, relay contacts, and high-current return paths. If the PCB uses a split analog and power ground arrangement, follow the manufacturer’s guidance on their connection so input-referred noise is not amplified by the LM2902KD.
Do not substitute the LM2902KD with a wider-supply LM2902B or LM324B device without reviewing every electrical limit. Although related devices may share the amplifier concept and package family, the LM2902KD has a 26 V maximum supply rating. Also avoid leaving an unused amplifier input floating; configure the channel in a stable state according to the manufacturer datasheet to prevent oscillation and unexpected output transients.
For low-level sensor signals, treat the typical 3 mV input offset voltage and 2 nA input offset current as error sources. A source with high impedance can also create an offset contribution proportional to input bias current. Use low-value, low-noise feedback resistors, keep input traces short, and provide adequate filtering before amplification when sensor noise or transient interference is present.
合規資訊
Exact-orderable-part environmental declarations must be confirmed through the current Texas Instruments product and compliance documentation.
