LM258AM - Dual 30V 700kHz Operational Amplifier | onsemi
MPN： LM258AM ✓ 啟用中LM258AM 概覽
An operational amplifier is a high-gain analog signal-processing IC that compares its inverting and non-inverting inputs and drives its output according to the voltage difference between them. The LM258 family belongs to the operational-amplifier category within analog amplifiers and linear integrated circuits. It is intended for general-purpose designs rather than precision, low-noise, or high-speed instrumentation, providing a practical balance of supply range, gain, common-mode capability, and output swing.
Key features include two independent channels, large DC voltage gain of 100 dB, and internal frequency compensation that supports unity-gain operation without an external compensation network. The input common-mode voltage range includes ground, supporting single-supply signal conditioning where the signal is referenced to 0 V. These characteristics make the LM258AM suitable for transducers, industrial controls, audio and communication interfaces, sensor amplification, and general feedback-control circuits.
The architecture is based on two independent high-gain amplifier sections with internal compensation. Internal compensation simplifies PCB design and improves usability at unity gain, while the wide supply range permits operation from lower-voltage single supplies through industrial supplies up to 30 V. Because this is a general-purpose bipolar-style amplifier family, engineers should verify input common-mode limits, output swing, load capability, stability, and supply-current requirements against the manufacturer datasheet for the exact operating conditions.
Typical applications include current-loop and voltage-feedback control, low-side sensing, sensor signal conditioning, audio preamplification, active filtering, threshold detection, and general industrial interface circuits. The dual arrangement is especially useful when a design needs two related functions, such as an error amplifier paired with a buffer or a comparator paired with a gain stage.
When laying out an LM258AM circuit, keep input and feedback connections compact to minimize parasitic pickup, provide adequate supply bypassing near the device, and verify that source and load impedances remain within the stability requirements of the internal compensation. The SOIC-8 package also allows a smaller footprint than a traditional through-hole dual operational amplifier.
This page consolidates the LM258AM electrical characteristics, package information, verified source links, replacement considerations, comparison parameters, and practical design guidance into one engineering-focused resource for part selection and PCB implementation.
直接替換替代品，適用於 LM258AM — 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。
此系列的變體
與下列產品可直接替換的同系列型號： LM258AM （相同外形與佔位） — 差異在於 Input Common-Mode Range, Package.
LM258DR
✅ 直接替換聯絡詢價
查看資料表 →LM258ADT
✅ 直接替換📋 參考替代品（不在目錄中）
LM358ADT
✅ 直接替換📋 參考替代品（不在目錄中）
LM258AM 最大額定值與電氣特性
| Amplifier Type | General-purpose operational amplifier |
| Number of Channels | 2 channels |
| Maximum Supply Voltage | 30 V |
| Gain-Bandwidth Product | 700 kHz |
| DC Voltage Gain | 100 dB |
| 工作溫度 | -25°C to +85°C |
| Compensation | Internally frequency compensated |
| Input Common-Mode Range | Includes ground |
| Supply Type | Single supply |
| Channel Independence | 2 independent amplifier channels |
| 封裝 | 8-SOIC, 3.90 mm width |
| 安裝類型 | Surface mount |
| 腳位數 | 8 pins |
LM258AM 8-soic, 3.90 mm width 腳位配置指南
LM258AM（8-soic, 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： LM258AM.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM258AM 適用於 6 應用s: Industrial Sensor Signal Conditioning, Low-Side Current Sensing, Audio Preamplification, Active Filtering and Signal Conditioning, Threshold Detection and Control, General-Purpose Interface Amplification.
Industrial Sensor Signal Conditioning
The onsemi LM258AM fits sensor-conditioning circuits that require two amplifier channels, a 700 kHz gain-bandwidth product, and single-supply operation up to 30 V. One channel can amplify a sensor output while the second provides filtering or an active gain stage. Its 100 dB DC voltage gain supports moderate closed-loop gain, while the input common-mode range including ground is useful for signals referenced to 0 V. The -25°C to +85°C rating suits industrial equipment. Confirm source impedance, sensor output swing, and the exact common-mode limits before calculating gain.
推薦
Low-Side Current Sensing
LM258AM can amplify the small differential voltage produced by a low-side current shunt in a control or monitoring system. The two independent channels allow one amplifier to process the shunt signal and the other to provide filtering or level conditioning for a controller input. A 30 V maximum supply voltage accommodates industrial supply transients, while the input common-mode range including ground suits low-side sensing. The 700 kHz gain-bandwidth product supports moderate-bandwidth feedback networks, but offset voltage and input bias current must be checked against the smallest expected shunt voltage.
推薦
Audio Preamplification
The LM258AM is suitable for modest audio preamplification and active filter stages that do not require rail-to-rail operation or low-noise performance beyond general-purpose levels. Its dual-channel organization can amplify one signal path while handling a second related channel, and internal frequency compensation simplifies unity-gain feedback layouts. The 700 kHz gain-bandwidth product is adequate for many voice-band and control-signal applications. Designers should verify output swing into the intended load, input bias behavior, supply-noise coupling, and the achievable bandwidth at the selected closed-loop gain.
推薦
Active Filtering and Signal Conditioning
LM258AM fits active filter and analog conditioning designs where two channels can form a cascaded or parallel signal path. The 700 kHz gain-bandwidth product provides useful bandwidth for low- to moderate-frequency filters, and the 100 dB DC voltage gain helps preserve loop performance in precision-gain sections. Internal frequency compensation removes the need for an external dominant-pole capacitor in compatible configurations. Component tolerances and amplifier parasitics remain important at high Q, so engineers should use the datasheet gain-bandwidth and open-loop-response information to validate stability and expected response.
推薦
Threshold Detection and Control
The dual LM258AM can implement threshold detection and feedback control without requiring two separate packages. One channel can compare a feedback-adjusted signal with a reference, while the other buffers the reference or amplifies the returned control signal. Single-supply operation up to 30 V supports industrial control systems, and the common-mode range including ground is helpful when signals remain near the lower rail. The designer must confirm output-swing limits, input offset, and response speed so the comparator-like function does not suffer from noise or overload near the threshold.
推薦
General-Purpose Interface Amplification
LM258AM can condition inputs and outputs at the interface between sensors, transducers, and higher-level control electronics. Its two amplifier channels provide economical channel density in an 8-SOIC package, while the broad single-supply capability supports both low-voltage and industrial 24 V class environments when the exact operating limits are respected. The 700 kHz bandwidth is suitable for many control and communications signals but not high-speed data channels. Confirm supply bypass requirements, allowable input common-mode range, output loading, and channel-to-channel usage against the manufacturer documentation.
推薦
推薦產品摘要
工程參考資料，適用於 LM258AM — 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 | LM258DR | LM258ADT | LM358ADT |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | SOIC-8 | SOIC-8 |
| Brand | onsemi | Texas Instruments | STMicroelectronics | STMicroelectronics |
| Number of Channels | 2 channels | 2 channels | 2 channels | 2 channels |
| Mounting Type | Surface mount | Surface mount | Surface mount | Surface mount |
主要差異化特點
- Combines two independent channels with single-supply operation (對比LM358ADT)
- Provides a lower nominal gain-bandwidth product than the faster LM358ADT candidate (對比LM358ADT)
- Matches the broad SOIC package and dual-channel organization of the TI candidate (對比LM258DR)
設計說明
Place the supply-bypass capacitor close to the LM258AM supply pins and connect it to the ground reference using a short, low-impedance path. Keep the two channels physically separate when one handles a low-level signal and the other drives a larger load. Route input and feedback traces away from the supply, output, and clocked digital lines to reduce parasitic coupling into the high-gain amplifier inputs.
Do not assume that a dual SOIC amplifier is automatically interchangeable with the LM258AM. Before substituting a candidate, compare pin assignments, supply range, input common-mode range, output swing, offset voltage, input bias current, gain-bandwidth product, slew rate, and load behavior. In particular, the LM358ADT is identified as a 1.1 MHz part, 0.4 MHz or 57% faster than the LM258AM, so its stability and output behavior can differ.
Use the internal frequency compensation only within the gain and load conditions supported by the manufacturer documentation. For low-frequency precision applications, select feedback resistors that keep the effective noise gain and closed-loop gain within the stable operating region. If the source has high impedance, account for input bias-current error and capacitance, and avoid very long PCB traces that add leakage and coupling.
The LM258AM is specified for -25°C to +85°C operation, and its internal power dissipation varies with supply voltage, output swing, load current, and the number of active channels. Estimate worst-case dissipation using the actual rail and load conditions, then confirm the 8-SOIC copper area and ambient temperature provide adequate junction-temperature margin. Two channels dissipating simultaneously require separate attention to each amplifier’s output current.
合規資訊
Compliance declarations are not stated in the cited LM258AM product information. Check the current manufacturer product page or applicable declaration before treating the component as RoHS, REACH, lead-free, halogen-free, or conflict-minerals compliant.