LM359M - Dual 400 MHz Norton Amplifier | Texas Instruments
MPN： LM359M ✓ 啟用中LM359M 概覽
An operational amplifier is an active analog signal-conditioning device that amplifies the difference between two input voltages while using negative feedback to set closed-loop behavior. The LM359 uses a current-mode, or Norton, input architecture rather than the voltage-input architecture common in conventional voltage-feedback amplifiers. This topology can provide high speed and high gain-bandwidth performance when supported by suitable external current-setting and compensation networks.
The LM359 family provides two amplifiers in one package, reducing component count in dual-channel signal paths. Its high gain-bandwidth product makes it useful in video, communications, instrumentation, and active-filter circuits where signal bandwidth matters. The user-programmable gain and frequency characteristics allow circuit designers to tailor amplifier behavior with external resistors and capacitors, although stability must be checked for each selected feedback network.
The LM359M is a 14-SOIC device with two amplifier sections, separate supply pins, and exposed package leads for through-hole board assembly or compatible PCB land patterns. Because it is a current-mode amplifier, input bias current, feedback-current selection, compensation, and maximum output swing require attention during design. The 400 MHz gain-bandwidth product does not mean every closed-loop circuit will operate at 400 MHz; usable bandwidth depends on gain, noise, stability, loading, and the external network.
Typical uses include wideband video signal conditioning, pulse shaping, communications interfaces, active filters, oscillators, and instrumentation. The device is also suitable for educational and laboratory designs where a programmable high-speed analog amplifier is useful. Designers should begin with the manufacturer LM359 datasheet and verify the recommended external components for the intended gain and frequency response.
A key design consideration is that LM359M is not a universal replacement for every voltage-feedback operational amplifier. Feedback topology, input bias-current behavior, compensation, output drive, and supply requirements must be checked against the original circuit. Stable operation also requires careful PCB layout, short feedback paths, suitable bypassing, and controlled parasitic capacitance.
This page combines verified manufacturer and distributor information, package and application context, practical design guidance, and clearly identified data gaps. It is intended to help engineers evaluate LM359M for high-speed dual-amplifier designs without confusing its current-mode architecture with conventional voltage-feedback amplifier families.
直接替換替代品，適用於 LM359M — 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： LM359M （相同外形與佔位） — 差異在於 Package, Gain-Bandwidth Product, Mounting Type, Number of Circuits.
LM359M 最大額定值與電氣特性
| Product Type | Dual operational amplifier |
| Amplifier Architecture | Current-mode Norton amplifier |
| Number of Circuits | 2 circuits |
| Gain-Bandwidth Product | 400 MHz |
| Slew Rate | 60 V/µs |
| Programmability | User-programmable gain and frequency |
| 封裝 | 14-SOIC |
| Package Width | 3.90 mm |
| 安裝類型 | Through-hole compatible SOIC package |
| Standard Packaging | Tube |
LM359M 3.90 mm 腳位配置指南
LM359M（3.90 mm 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： LM359M.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM359M 適用於 6 應用s: High-Speed Video Signal Conditioning, Communications Pulse Shaping, Precision Active Filters, Test and Measurement Instrumentation, Oscillator and Waveform Generation, Industrial Sensor Signal Conditioning.
High-Speed Video Signal Conditioning
LM359M fits high-speed video signal conditioning because the verified data specifies a 400 MHz gain-bandwidth product and 60 V/µs slew rate. Its current-mode Norton input architecture can be used with external feedback and gain-setting networks to amplify or reshape signals in instrumentation and video test equipment. The circuit should be compensated for the intended closed-loop gain, source impedance, cable or load capacitance, and output amplitude. Because this is a current-mode amplifier, feedback-current selection and stability are more important than simply copying a conventional voltage-feedback layout.
推薦
Communications Pulse Shaping
LM359M is applicable to communications pulse-shaping circuits when fast voltage transitions and programmable amplifier behavior are required. The verified 60 V/µs slew rate supports high-speed edge handling, while the 400 MHz gain-bandwidth product provides a useful starting point for wideband stages. Use the LM359 current-mode feedback topology to set pulse amplitude and bandwidth, and include termination, bias-current compensation, and stability compensation appropriate to the line interface. Verify timing, overshoot, and distortion against the actual source and load.
推薦
Precision Active Filters
LM359M can support active-filter designs where the filter requires a high-speed amplifier and user-programmable compensation. The 400 MHz gain-bandwidth product and 60 V/µs slew rate provide bandwidth and transition-speed headroom, but the actual filter response depends on the selected feedback resistors and capacitors. Because the LM359 is a Norton current-mode amplifier, design equations and stability checks must match its input and feedback behavior. Simulate the complete filter and include source, load, and PCB parasitic capacitance before fabrication.
推薦
Test and Measurement Instrumentation
LM359M is appropriate for laboratory and test-instrument front ends that need wideband amplification or signal conditioning. Its dual-circuit configuration allows two related channels to share one package, and the verified high gain-bandwidth product supports fast signal paths. The amplifier should be configured with current-mode-compatible feedback and suitable bypass capacitors. Calibration, input protection, output isolation, and bandwidth measurements are important because a broad amplifier specification does not guarantee the same accuracy at every frequency or gain setting.
推薦
Oscillator and Waveform Generation
LM359M can be used in oscillator and waveform-generation circuits because its high slew rate and programmable gain support fast signal development. The Norton topology permits external current-setting elements to influence amplifier behavior, which is useful in tuned or feedback oscillator experiments. Component tolerances, phase margin, output loading, and supply bypassing will determine frequency and waveform quality. Start with the manufacturer's application guidance and verify oscillation startup and amplitude on the final PCB rather than relying only on nominal gain-bandwidth figures.
推薦
Industrial Sensor Signal Conditioning
LM359M may be useful in industrial sensor signal-conditioning paths where sensor signals require amplification before measurement or control. The dual package can reduce board area, and the verified 60 V/µs slew rate supports signals with rapid transitions. However, sensor interfaces may require low input bias current, low offset, noise performance, and protection that are not established by the supplied snippets. Confirm those specifications in the official datasheet, and include filtering, shielding, grounding, and supply bypass in the sensor front end.
推薦
推薦產品摘要
工程參考資料，適用於 LM359M — 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 | LM358M |
|---|---|---|
| Package | 14-SOIC | 14-SOIC |
| Brand | Texas Instruments | Texas Instruments |
| Number of Circuits | 2 circuits | 2 circuits |
主要差異化特點
- Current-mode Norton input architecture with programmable behavior (對比LM358M)
- High verified gain-bandwidth product (對比LM358M)
- High verified slew rate (對比LM358M)
設計說明
Use LM359M as a current-mode Norton amplifier and follow the manufacturer's feedback-current and compensation guidance. Keep the feedback loop short, place gain-setting and compensation components close to the device pins, and avoid long traces that add parasitic capacitance. Do not reuse a conventional voltage-feedback op-amp layout without rechecking stability and bias-current behavior.
Route supply connections with low loop area and place bypass capacitors close to the relevant supply pins. Keep high-speed signal traces short and provide a controlled ground-return path. Because the verified package is 14-SOIC, check the manufacturer's package drawing and pin numbering against the actual PCB footprint before fabrication.
The 400 MHz gain-bandwidth product is not a guaranteed closed-loop bandwidth. Gain, feedback resistance, compensation capacitance, source impedance, load capacitance, and supply conditions can reduce usable bandwidth or cause instability. Verify the complete circuit with the actual load and include an output protection network when driving cables or external test equipment.
合規資訊
Compliance information was not included in the supplied verified snippets. Confirm current material declarations and product documentation from Texas Instruments for the exact orderable part.
