LM258DT - Dual 30V Low-Power Op Amp | STMicroelectronics
Артикул: LM258DT ✓ АктивенLM258DT Обзор
An operational amplifier is an analog signal-conditioning IC that uses high open-loop gain and negative feedback to amplify, buffer, filter, or compare voltages. The LM258DT belongs to the bipolar operational-amplifier family and combines two amplifiers in one package, reducing board area when a circuit needs matched general-purpose gain stages. Its internally frequency-compensated architecture simplifies closed-loop design because the compensation network is integrated rather than added externally.
Each amplifier offers a unity-gain bandwidth of 1.1 MHz and a slew rate of 0.6 V/us, making the device suitable for audio-frequency signal paths, sensor conditioning, active filtering, voltage amplification, and general feedback-control blocks. The low-power supply drain is approximately 500 uA per amplifier and is essentially independent of supply-voltage magnitude. The low input bias current of approximately 20 nA also helps minimize source-loading errors in high-impedance sensing circuits.
The dual architecture supports independent signal paths, including two noninverting stages, two inverting stages, mixed gain stages, or a buffer paired with an active filter. Both amplifiers share the same supply pins but operate independently. Their common supply range allows them to use a single rail in portable instrumentation, industrial control, sensor interfaces, and low-voltage embedded systems. The 8-SOIC package is suitable for conventional surface-mount PCB assembly and temperature-controlled lead-free manufacturing processes.
Designers should account for input and output voltage limitations when using a single positive supply. The LM258DT is not a rail-to-rail input or output device, so the usable signal range must remain inside the common-mode and output-swing limits stated in the manufacturer datasheet. Place bypassing capacitors close to the supply pins and maintain adequate PCB copper for heat dissipation. Stable operation also depends on selecting appropriate feedback components and avoiding capacitive loading directly at the amplifier output.
This product page combines the LM258DT electrical characteristics, package and pin information, application guidance, comparison criteria, and practical design considerations into a compact engineering reference for initial design decisions.
Аналоги без доработки для LM258DT — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с LM258DT (тот же форм-фактор и посадочное место) — отличается по Input Bias Current, Package, Slew Rate.
LM258ADT
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LM258DR2G
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LM358DT
✅ Прямая замена✗ Нет в наличии
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Открыть даташит →LM358ST
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Открыть даташит →LM258DT Максимальные параметры и электрические характеристики
| Amplifier Type | Dual low-power operational amplifier |
| Number of Amplifiers | 2 amplifiers |
| Circuit Count | 2 circuits |
| Supply Voltage Range | 3 V to 30 V |
| Unity-Gain Bandwidth | 1.1 MHz |
| Slew Rate | 0.6 V/us |
| DC Voltage Gain | 100 dB |
| Supply Current per Amplifier | 500 uA |
| Input Bias Current | 20 nA |
| Compensation | Internally frequency compensated |
| Корпус | 8-pin SOIC |
| Количество выводов | 8 pins |
| Тип монтажа | Surface mount |
| Рабочая температура | -40 C to +105 C |
| Amplifier Configuration | Two independent operational amplifiers |
| Supply Drain Dependence | Essentially independent of supply-voltage magnitude |
Конфигурация выводов LM258DT
| Контакт 1 | OUT1 — Amplifier 1 output |
| Контакт 2 | -IN1 — Inverting input of amplifier 1 |
| Контакт 3 | +IN1 — Noninverting input of amplifier 1 |
| Контакт 4 | V- — Negative supply or ground connection for a single-supply circuit |
| Контакт 5 | +IN2 — Noninverting input of amplifier 2 |
| Контакт 6 | -IN2 — Inverting input of amplifier 2 |
| Контакт 7 | OUT2 — Amplifier 2 output |
| Контакт 8 | V+ — Positive supply input |
Типичное применение
LM258DT подходит для 6 применениеs: Low-Power Sensor Signal Conditioning, Industrial Control and Actuator Interfaces, Audio-Frequency Amplification, Active Filters and Signal Conditioning, Portable and Battery-Powered Instrumentation, Power-Supply Feedback and Reference Conditioning.
Low-Power Sensor Signal Conditioning
The LM258DT fits low-level sensor interfaces that use one positive supply because its specified 3 V to 30 V operating range covers both compact embedded systems and higher-voltage industrial inputs. The approximately 20 nA input bias current minimizes loading of high-impedance sensors, while 1.1 MHz unity-gain bandwidth provides more bandwidth than required by many temperature, pressure, and position sensors. The two amplifiers can implement separate gain and buffering stages. Designers must verify that the sensor voltage stays inside the LM258's input common-mode range and leaves sufficient output headroom, because the device is not rail-to-rail at its input or output.
Рекомендуется
Industrial Control and Actuator Interfaces
The LM258DT is appropriate for industrial control blocks that amplify control-error signals or buffer sensor outputs while operating from a single supply. Its 1.1 MHz bandwidth and 0.6 V/us slew rate support ordinary control and feedback signals without the power consumption of a faster dual amplifier. Two independent channels can process related inputs or implement gain and filtering functions in one 8-SOIC package. A key design consideration is the output-swing limit: an actuator command near either supply rail may require a higher-headroom driver, even though the supply itself remains within the 3 V to 30 V range.
Рекомендуется
Audio-Frequency Amplification
The LM258DT can serve as a general-purpose audio-frequency gain stage when the signal bandwidth remains modest. Its 1.1 MHz unity-gain bandwidth is substantially above the upper audio band, and the 0.6 V/us slew rate can reproduce many low-to-mid-frequency waveforms without obvious slew distortion. The dual package allows left and right channel processing in an 8-SOIC footprint. Audio designs must still account for common-mode range, output swing, load capability, and channel matching, particularly when the amplifier is powered from a single low-voltage rail and drives a higher-impedance load.
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Active Filters and Signal Conditioning
The LM258DT is suitable for first-order and simple second-order active-filter stages because both amplifiers are internally frequency compensated. A 1.1 MHz unity-gain bandwidth gives ample headroom over many audio, control, and sensor-filter applications, while approximately 500 uA supply current per amplifier supports low-power designs. The two amplifiers can form two filter sections or one filter plus a buffer. Resistor and capacitor selection determine the actual bandwidth, while input bias current, common-mode range, output loading, and power-supply bypass capacitance should be evaluated during prototype validation.
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Portable and Battery-Powered Instrumentation
The LM258DT suits portable measurement equipment because it provides two amplifier channels in an 8-SOIC package while drawing approximately 500 uA per amplifier. The low-power supply drain is essentially independent of supply-voltage magnitude, helping simplify power planning across different battery and regulated-rail conditions. Its 20 nA input bias current is valuable when the source impedance is high. The device can amplify thermocouple, strain-gauge, or resistive-sensor signals only when common-mode and output-swing requirements are satisfied, so instrument designers should calculate worst-case input and output voltages before finalizing the circuit.
Рекомендуется
Power-Supply Feedback and Reference Conditioning
The LM258DT can implement error-amplifier, voltage-feedback, or reference-conditioning stages in low-frequency power-supply control loops. Its 100 dB DC voltage gain provides substantial open-loop gain for regulation, while the internally compensated 1.1 MHz amplifier is appropriate for loops with bandwidth well below the unity-gain frequency. One channel can amplify the error signal and the other can provide a buffered reference or feed-forward path. Stability, output-current demand, minimum load, and maximum output swing must be checked against the specific power-converter topology rather than inferred solely from the amplifier headline bandwidth.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LM258DT — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LM258ADT | LM258DR2G | LM358DT | LM358ST | LM258DT |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same |
| Amplifier Count | 2 amplifiers | 2 amplifiers | 2 amplifiers | 2 amplifiers | 2 amplifiers | 2 amplifiers |
| Supply Voltage Range | 3 V to 30 V | 3 V to 30 V | 3 V to 30 V | 3 V to lower maximum rating | 3 V to lower maximum rating | Up to 30 V |
| Unity-Gain Bandwidth | 1.1 MHz | Approximately 1.1 MHz | Approximately 1.1 MHz | Approximately 1.0 MHz | Approximately 1.0 MHz | 700 kHz |
| Operating Temperature | -40 C to +105 C | Temperature grade requires confirmation | Temperature grade requires confirmation | Temperature grade requires confirmation | Temperature grade requires confirmation | -25 C to +85 C |
Ключевые отличия
- Higher supply capability than the LM358 alternatives (против LM358DT)
- Higher listed bandwidth than the cross-brand LM258 (против Texas Instruments LM258DT)
- Explicit slew-rate suitability for higher-frequency audio and control signals (против LM358DT)
Заметки по проектированию
Check the actual signal range before treating the 3 V to 30 V supply rating as complete input-output capability. The LM258DT is not rail-to-rail, so a 5 V single-supply design must keep both input voltages within the common-mode range and leave the output below the positive swing limit. In dual-supply operation, include the negative-rail headroom as well. This is especially important when the amplifier is used directly at the output of a sensor or converter.
Place the supply-bypass capacitor close to pins 8 and 4 and connect it with a short, low-inductance path. Because both amplifier channels use the same supply pins, bypassing helps prevent output-current transients in one channel from modulating the other. Maintain a quiet return path and avoid routing sensitive input traces beneath the op-amp or switching-converter area. Use the manufacturer pin layout as the basis for the footprint.
Do not assume that the 8-SOIC pin arrangement makes every LM258 or LM358 ordering code an automatic functional substitute. Confirm input common-mode range, output swing, supply-current rating, minimum load behavior, input-bias-current limits, temperature grade, and stability with the intended feedback network. The LM358 family's lower supply ceiling can be decisive in circuits operating above 30 V, even when the package and basic dual-amplifier architecture match.
Информация о соответствии
No explicit RoHS, REACH, halogen-free, lead-free, conflict-minerals, or automotive-qualification statement was identified for the exact LM258DT orderable MPN. The LM258ADT ordering code should not be assumed to provide automotive qualification without its individual product documentation.