LM2902KDG4 - Quad 26V 1.2MHz Op Amp | Texas Instruments
Артикул: LM2902KDG4 ✗ Снят с производстваLM2902KDG4 Обзор
An operational amplifier is an analog integrated circuit that compares voltages applied to its inverting and non-inverting inputs and produces an output voltage representing that difference. When negative feedback surrounds the amplifier, it forms the core building block of voltage amplifiers, current buffers, comparators, filters, integrators, and sensor-conditioning circuits. The LM2902K places four such channels in one package, allowing a compact design to handle several independent low-frequency analog signals.
The quad configuration provides four channels, 26 V maximum supply voltage, and 1.2 MHz gain-bandwidth product. These characteristics make the LM2902KDG4 suitable for general-purpose signal conditioning where the required signal bandwidth is below the amplifier's 1.2 MHz unity-gain capability. Its 2 kV improved ESD capability provides additional protection against electrostatic discharge encountered during handling or installation.
The 14-SOIC construction is appropriate for conventional through-hole board assembly because the leads extend from the sides of the package. A quad package also reduces the number of amplifier packages required when a design needs four channels. Channel assignment and electrical behavior should be confirmed against the manufacturer pin-description table before PCB routing, particularly for power pins, input pins, and output pins.
Typical uses include audio preamplification, instrumentation-signal conditioning, active filtering, transducer amplification, analog control loops, and general sensor interfaces. In a typical application, the LM2902KDG4 can amplify a low-level sensor signal, buffer an analog source, or implement an active filter with external resistors and capacitors. Common-mode range, input bias current, output swing, and stability requirements must be checked against the actual circuit.
A key design consideration is power-supply bypassing. Place the required bypass capacitors close to the supply pins and route the ground return directly to the device ground. Avoid long analog traces, maintain a stable reference for each feedback network, and verify that the selected feedback and compensation values support the intended closed-loop bandwidth at the 1.2 MHz gain-bandwidth product.
This product record combines the exact ordering information for LM2902KDG4 with package identification, lifecycle context, verified manufacturer characteristics, sourcing guidance, and engineering-oriented comparison information. It helps designers distinguish the discontinued orderable variant from related LM2902K products while focusing attention on the electrical and PCB implications of replacement.
Аналоги без доработки для LM2902KDG4 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
LM2902KDR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LM2902DR
✅ Прямая заменаУточнить цену
Открыть даташит →LM2902KDG4 Максимальные параметры и электрические характеристики
| Product Type | General-purpose operational amplifier |
| Number of Amplifier Channels | 4 channels |
| Maximum Supply Voltage | 26 V |
| Gain-Bandwidth Product | 1.2 MHz |
| Improved ESD Capability | 2 kV |
| Корпус | 14-SOIC |
| Package Body Width | 3.90 mm (0.154 inch) |
| Тип монтажа | Through-hole |
| Количество выводов | 14 pins |
| Channel 1 Output Pin | Pin 1 |
| Channel 2 Output Pin | Pin 7 |
| Channel 3 Output Pin | Pin 8 |
| Channel 4 Output Pin | Pin 14 |
| Positive Supply Pin | Pin 12 |
| Negative Supply Pin | Pin 4 |
Конфигурация выводов LM2902KDG4
| Контакт 1 | OUT1 — Channel 1 output |
| Контакт 2 | -IN1 — Channel 1 inverting input |
| Контакт 3 | +IN1 — Channel 1 non-inverting input |
| Контакт 4 | V- — Negative supply connection |
| Контакт 5 | +IN2 — Channel 2 non-inverting input |
| Контакт 6 | -IN2 — Channel 2 inverting input |
| Контакт 7 | OUT2 — Channel 2 output |
| Контакт 8 | OUT3 — Channel 3 output |
| Контакт 9 | -IN3 — Channel 3 inverting input |
| Контакт 10 | +IN3 — Channel 3 non-inverting input |
| Контакт 11 | NC — Not connected |
| Контакт 12 | V+ — Positive supply connection |
| Контакт 13 | -IN4 — Channel 4 inverting input |
| Контакт 14 | +IN4 — Channel 4 non-inverting input |
Типичное применение
LM2902KDG4 подходит для 6 применениеs: Audio Preamplification, Sensor Signal Conditioning, Active Filtering, Industrial Instrumentation, Analog Control Loops, Data Acquisition Front End.
Audio Preamplification
The LM2902KDG4 can provide four independent general-purpose amplifier channels for low-frequency audio preamplification in a single 14-SOIC package. Its 1.2 MHz gain-bandwidth product is suitable for audio-band signal paths, while the quad organization can reduce board area compared with four separate single amplifiers. The designer must select resistor and capacitor values that establish the required gain and frequency response without exceeding the amplifier's output-swing and load-current limits. Decoupling capacitors should be placed close to the supply pins, and analog traces should remain short and away from high-current switching paths.
Sensor Signal Conditioning
A 14-SOIC quad operational amplifier is useful when several sensor outputs require amplification or buffering. The LM2902KDG4 offers four channels, a 26 V maximum supply rating, and a 1.2 MHz gain-bandwidth product for conditioning signals well below the megahertz range. Each channel can implement a non-inverting or inverting stage, a unity-gain buffer, or an active filter. Before selection, verify the sensor output range against the input common-mode limits and calculate the required gain, output swing, and bias network to prevent saturation.
Active Filtering
The four channels in the LM2902KDG4 can implement multiple first-order or cascaded active-filter sections within one package. Its 1.2 MHz gain-bandwidth product provides ample bandwidth for many low-frequency audio, measurement, and control filters, although the exact usable bandwidth depends on closed-loop gain, noise gain, phase margin, and component tolerances. Confirm resistor and capacitor values against the desired cutoff and Q, keep feedback loops compact, and place bypass capacitance at the device to limit supply-impedance effects within each filter section.
Industrial Instrumentation
The LM2902KDG4 fits general industrial instrumentation blocks that need several low-frequency analog channels but do not require rail-to-rail inputs or outputs. Four channels in one 14-SOIC package can support amplifier, comparator, buffer, and integrator functions around low-level transducers. The 26 V supply ceiling and 1.2 MHz gain-bandwidth product are central selection criteria, while common-mode range, offset, input bias current, and output capability must be checked for the actual transducer interface. Use a stable low-impedance reference and protect sensitive input nodes from electrostatic exposure and nearby switching noise.
Analog Control Loops
The LM2902KDG4 can implement analog error amplifiers, transconductance stages, integrators, and control-loop elements when the required loop bandwidth is compatible with the 1.2 MHz gain-bandwidth product. The quad package allows several control functions to share one 14-SOIC footprint, which can simplify board partitioning. Designers should verify phase margin, loop gain, output swing, and load behavior, then keep compensation and feedback components close to the relevant pins. The 26 V maximum supply voltage also requires a deliberate system-level overvoltage assessment.
Data Acquisition Front End
Four LM2902KDG4 channels can provide programmable-gain, buffering, or channel-conditioning stages ahead of an analog-to-digital converter. The device's 1.2 MHz gain-bandwidth product supports signal paths below the megahertz range, making it relevant for slowly varying industrial, instrumentation, and embedded measurements. The key design checks are input common-mode range, input offset, output swing referenced to the converter's input range, noise gain, and the ADC's sampling characteristics. Keep sensitive inputs short and use separate local bypassing to prevent coupling between analog channels.
Справочные инженерные данные для LM2902KDG4 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LM2902KDR | LM2902DR |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | STMicroelectronics |
| Package | 14-SOIC | 14-SOIC - same | 14-SOIC - same |
| Product Type | General-purpose operational amplifier | General-purpose quad operational amplifier | Quad general-purpose operational amplifier |
| Amplifier Channels | 4 channels | 4 channels | 4 channels |
Ключевые отличия
- Exact discontinued Texas Instruments ordering code (против LM2902KDR)
- Four channels in one 14-SOIC package (против LM2902DR)
- 26 V family supply ceiling with improved ESD protection (против LM2902DR)
Заметки по проектированию
Treat the 14-SOIC footprint as a through-hole layout and assign pins 12 and 4 to the positive and negative supply rails. Place the required bypass capacitors close to those pins, with short, low-inductance paths to the device ground. Check the manufacturer's pin-description table before final routing because neighboring signal pins carry the four amplifier channels.
Keep each op-amp feedback loop physically small and connect non-inverting inputs directly to the signal source where practical. Long feedback traces can add phase lag and reduce stability margin, particularly as closed-loop gain increases. Route sensitive input and feedback nets away from inductors, switching nodes, high-current returns, and other sources of coupled noise.
The 26 V maximum supply rating is an absolute constraint, not a recommended operating point. Also do not assume that a 14-SOIC footprint guarantees interchangeability: verify input polarity, channel assignment, common-mode range, output swing, slew rate, bias current, offset voltage, temperature range, and ESD rating for every proposed replacement before releasing production artwork.
The 1.2 MHz gain-bandwidth product is not automatically the usable closed-loop bandwidth. Calculate the closed-loop response from the selected noise gain and feedback topology, and add phase-margin margin for component tolerance. For filtering applications, include amplifier and resistor parasitics when setting cutoff frequency and Q, especially at the upper end of the intended signal range.
Информация о соответствии
No definitive RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration was established for the exact LM2902KDG4 ordering code. This general-purpose operational amplifier is not presented as an automotive-qualified AEC-Q100 device.