LM258AN - Dual Low-Power Op Amp | STMicroelectronics
料号： LM258AN ✓ 量产中LM258AN 概述
An operational amplifier, or op amp, is a voltage-gain amplifier that compares an inverting input with a non-inverting input and drives its output toward the difference between them. The LM258 belongs to the broader linear-IC hierarchy: operational amplifier, analog amplifier, voltage amplifier, and semiconductor. Internally compensated dual op amps are useful when a board needs two independent amplifier channels while limiting component count and keeping the two channels in one package.
The LM258AN provides two amplifier circuits with a large DC voltage gain of 100 dB and unity-gain frequency compensation. Its input common-mode voltage range includes ground, an important characteristic for circuits powered from a single positive supply and biased near the lower supply rail. The low-power architecture is designed to maintain low supply drain independently of the magnitude of the supply voltage, according to the manufacturer family documentation.
Each amplifier channel has separate input and output pins, while the two channels share the power supply connections. This arrangement supports conventional non-inverting, inverting, voltage follower, summing, and differential signal-conditioning circuits. Because the amplifiers are internally compensated, stable unity-gain operation can be implemented with a minimum external feedback network, reducing design effort in general-purpose analog equipment.
Typical LM258AN applications include sensor-signal conditioning, industrial control loops, low-frequency active filters, relay-driver interfaces, audio preamplifier stages, and buffered measurement systems. The dual configuration is especially useful when a circuit requires two related analog channels, such as an instrumentation amplifier input stage, motor-control feedback network, or dual-channel sensor interface.
When designing around the LM258AN, verify the exact input common-mode range, output swing, supply-current limits, and operating-temperature limits for the LM258 variant against the STMicroelectronics datasheet. Decoupling capacitors should be placed close to the supply pins, and the feedback network should preserve stable operation at the intended signal frequency.
This product page combines the LM258AN family characteristics, package information, sourcing guidance, comparison parameters, and practical circuit-planning notes. It is intended to help engineers evaluate the device for single-supply analog designs and identify same-package alternatives without overlooking package or qualification differences.
直接替换替代料： LM258AN ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LM258AN （相同外形与封装尺寸） ——差异在于 Frequency Compensation, Supply Configuration.
LM158N
✅ 直接替换📋 参考替代料（不在目录中）
LM358N
✅ 直接替换联系询价
查看数据手册 →LM258AN 最大额定值与电气特性
| Product Type | Dual operational amplifier |
| Amplifier Channel Count | 2 channels |
| Architecture | Two independent high-gain amplifiers |
| Frequency Compensation | Internally compensated for unity gain |
| DC Voltage Gain | 100 dB |
| Supply Configuration | Single-supply operation |
| Low-Power Supply Drain | Independent of supply-voltage magnitude for the LM358/LM358A family description |
| Package Type | 8-pin Mini DIP |
| 引脚数量 | 8 pins |
| 安装类型 | Through-hole |
| RoHS Compliance | unknown |
| REACH Compliance | unknown |
| Lead-Free Status | unknown |
| AEC-Q100 Qualification | not_applicable |
LM258AN 8-pin mini dip 引脚配置指南
LM258AN（8-pin mini dip 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： LM258AN.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM258AN 适用于 6 应用s: Industrial Sensor Signal Conditioning, Audio Preamplifier, Active Filter and Control Loop, Power Supply Feedback Interface, Data Acquisition Front End, Motor and Relay Interface.
Industrial Sensor Signal Conditioning
The LM258AN fits low-frequency sensor interfaces that require two independent amplifier channels and single-supply operation near ground. Its input common-mode range includes ground, while each channel provides a 100 dB large DC voltage gain and internal unity-gain compensation. Two channels can amplify or buffer related sensor channels without adding a second amplifier package. The designer should verify the exact LM258AN common-mode limits, output swing, offset voltage, input bias current, and noise against the sensor output range. A practical arrangement may use one channel for signal amplification and the other for gain compensation or filtering.
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Audio Preamplifier
The LM258AN can serve in a low-frequency audio preamplifier when its noise, distortion, bandwidth, input impedance, and output swing meet the program-material requirements. Internal unity-gain compensation supports straightforward non-inverting and inverting stages, while the dual package can provide separate signal and gain-control paths. The input common-mode range including ground is useful for single-supply microphone or line-level interfaces. Verify the required headroom, maximum source resistance, load impedance, and stability margin, especially when driving a microphone transformer, long cable, or capacitive input.
推荐
Active Filter and Control Loop
The LM258AN is appropriate for low-frequency active filters and proportional control loops that benefit from two independent internally compensated channels. A pair of amplifiers can implement active-filter stages, error amplifiers, or integrator functions when their gain-bandwidth behavior is adequate for the control bandwidth. The 100 dB DC gain supports precise closed-loop gain, while internal compensation eliminates external compensation components in unity-gain configurations. Validate stability with the selected feedback network, source impedance, load, and supply capacitance because practical board parasitics can affect very high-Q or high-frequency filter designs.
推荐
Power Supply Feedback Interface
The LM258AN can support error-amplifier or feedback functions in low-frequency power-conversion designs because it operates from a single supply and includes ground in its input common-mode range. Two independent channels allow one amplifier to monitor a feedback node while the other performs a related differential or buffering function. The internal unity-gain compensation supports straightforward closed-loop layouts. Before implementation, verify output swing near the supply rails, input offset, input bias current, load capability, and loop stability over the intended control bandwidth and temperature range.
推荐
Data Acquisition Front End
The LM258AN is suitable for buffering or amplifying low-frequency inputs in a data-acquisition front end when the signal bandwidth is well below the amplifier's useful operating range. Its two-channel configuration can handle complementary inputs or provide a differential stage built from matched channels. The input common-mode range includes ground, supporting single-supply acquisition systems with signals near the lower rail. Confirm input bias current, offset voltage, noise, common-mode accuracy, output swing, and settling behavior against the acquisition resolution and sampling rate; a dedicated precision amplifier may be preferable for very high-resolution measurements.
推荐
Motor and Relay Interface
The LM258AN can provide low-level amplification and buffering around motor-control or relay-feedback networks, subject to its voltage and current limits. Two independent channels are useful for feedback monitoring and control-signal conditioning. The common-mode range including ground supports single-supply interface circuits, while internal unity-gain compensation simplifies feedback amplifiers. The output stage must remain within its specified load and swing capabilities, and protection should be added where inductive transients exceed the device ratings. Check noise susceptibility and loop stability if the amplifier sits close to switching nodes or motor drive circuitry.
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推荐产品汇总
工程参考数据： LM258AN ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LM158N | LM358N |
|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | 8-Pin Mini DIP (DIP-8) | 8-Pin Mini DIP (DIP-8) | 8-Pin Mini DIP (DIP-8) |
| Amplifier Channels | 2 channels | 2 channels | 2 channels |
| DC Voltage Gain | 100 dB | 100 dB | 100 dB |
| Frequency Compensation | Internal, unity-gain stable | Internal, unity-gain stable | Internal, unity-gain stable |
| Supply Configuration | Single supply | Single supply | Single supply |
关键差异点
- Two independently usable channels in one through-hole package （对比 LM158N)
- Single-supply operation with ground-inclusive input common mode （对比 LM358N)
- Internally frequency-compensated operation simplifies stable gain-of-one designs （对比 LM158N)
设计说明
Place the supply bypass capacitor close to the LM258AN power and ground pins and keep the connection path short. Keep each amplifier's feedback resistors close to the corresponding channel pins, and avoid routing sensitive inputs beside the output of the other channel. Because the two amplifiers share package-level power connections, verify supply decoupling at the device rather than relying on a capacitor located near an upstream connector.
Do not assume that every LM358-family number has identical LM258AN limits. In particular, confirm the exact supply range, common-mode input range, output swing, input offset voltage, input bias current, and operating-temperature grade from the relevant manufacturer datasheet. These values determine whether the amplifier can remain linear at the circuit's actual signal and supply levels.
The internal compensation supports unity-gain stability, but the complete circuit must still be checked for stability with the chosen feedback network, source impedance, load, and decoupling. Add series resistance at capacitive loads when required and maintain short feedback loops. For precision or low-noise measurements, evaluate offset and drift rather than relying only on the nominal 100 dB DC gain.
合规信息
No specific RoHS, REACH, halogen-free, lead-free, conflict-minerals, or automotive qualification statement appears in the linked product information. AEC-Q100 is not applicable because the LM258AN is a general-purpose operational amplifier rather than an automotive-qualified device.
