LT1639IS - 1.2MHz Micropower Rail-to-Rail Op Amp | Analog Devices
MPN： LT1639IS ✓ 啟用中LT1639IS 概覽
An operational amplifier is an active semiconductor component that uses external feedback to amplify voltage differences. The LT1639 belongs to the precision operational-amplifier family, combining low quiescent-current operation with over-the-top input and output capability. This makes it useful when the signal can move close to either supply rail while the circuit must remain compact and power efficient.
The LT1639IS provides four amplifier channels in one 14-pin package. Its rail-to-rail input stage supports signal ranges near the positive and negative supply rails, while the rail-to-rail output stage improves output swing flexibility. The 1.2 MHz unity-gain bandwidth is suitable for low-frequency instrumentation, sensor interfaces, audio support circuits, buffer stages, and general-purpose analog signal conditioning. The 0.4 V/us slew rate supports moderate-amplitude signal transitions without requiring a high-speed amplifier.
Because the LT1639 is intended for low-power applications, circuit design should account for supply voltage, load current, input common-mode range, output swing, noise, and stability. The SO package requires appropriate PCB land patterns and adequate thermal pathways when several channels operate continuously. Decoupling capacitors should be placed close to the supply pins, and feedback networks should be selected to preserve stability across the intended gain and load conditions.
Typical uses include battery-powered sensing, low-voltage instrumentation, audio preamplification, analog filtering, ADC or DAC interface buffering, and portable measurement equipment. Its four-channel configuration reduces board area compared with separate single or dual amplifiers when the same amplifier family is used throughout a design.
This product page combines the manufacturer product information, technical descriptions, package data, and practical design guidance into a focused reference for engineers evaluating the LT1639IS. It also records the available sourcing channel and identifies replacement candidates only when the package and functional requirements remain compatible.
直接替換替代品，適用於 LT1639IS — 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： LT1639IS （相同外形與佔位） — 差異在於 Package, Power Class.
LT1639IS#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LT1639IS#TR
✅ 直接替換📋 參考替代品（不在目錄中）
LT1639IS#TRPBF
✅ 直接替換📋 參考替代品（不在目錄中）
LT1639IS 最大額定值與電氣特性
| Product Type | Quad operational amplifier |
| Number of Amplifier Channels | 4 channels |
| Unity-Gain Bandwidth | 1.2 MHz |
| Slew Rate | 0.4 V/us |
| Input Common-Mode Range | Rail-to-rail input |
| Output Swing | Rail-to-rail output |
| Power Class | Micropower |
| Over-The-Top Operation | Yes |
| Nominal Operating Temperature Range | -40C to +85C |
| Common-Mode Rejection Ratio | 88 dB |
| 封裝 | 14-SO surface-mount package |
| Package Pin Count | 14 pins |
| 安裝類型 | Surface mount |
| AEC-Q100 Qualification | Not applicable |
LT1639IS 14 pins 腳位配置指南
LT1639IS（14 pins 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： LT1639IS.
請參閱 資料表 以查看完整腳位配置。
典型應用
LT1639IS 適用於 6 應用s: Low-Voltage Sensor Conditioning, Portable Measurement Instrumentation, Audio Preamplification, ADC and DAC Interface Buffering, Active Filtering and Signal Conditioning, Industrial Control Signal Conditioning.
Low-Voltage Sensor Conditioning
The LT1639IS is suitable for conditioning outputs from resistive, capacitive, and voltage-based sensors in compact battery-powered equipment. Rail-to-rail input operation helps preserve signal range when the sensor output lies close to a supply rail, while the 0.4 V/us slew rate is sufficient for many slowly changing or moderate-bandwidth measurements. Four channels allow related sensor, reference, and filtering functions to share one package. Designers should verify the exact common-mode and output-swing limits against the LT1638/LT1639 datasheet, keep the input network close to the amplifier, and use stable feedback values for the intended gain.
推薦
Portable Measurement Instrumentation
The LT1639IS can provide four low-power amplifier stages in portable meters, data loggers, and handheld analyzers. Its 1.2 MHz unity-gain bandwidth supports signal conditioning across many slow and medium-speed measurement paths without requiring a large high-speed package. The quad configuration reduces component count and PCB area when the instrument needs several buffered inputs or active filters. Because the exact supply range and quiescent-current limits are not stated in the product-page extract, the design should begin with the manufacturer datasheet and include local bypass capacitors, defined return paths, and gain-bandwidth checks for the fastest instrument channel.
推薦
Audio Preamplification
The LT1639IS can serve as a four-channel low-level audio preamplifier in compact consumer or instrumentation equipment. Rail-to-rail input and output operation is useful when the available signal and load ranges leave limited headroom, while the 1.2 MHz bandwidth comfortably covers the audio band in typical signal paths. The 0.4 V/us slew rate can reproduce moderate-level sinusoidal waveforms, though very large signals may require a faster amplifier. Layout should keep feedback resistors and input coupling paths compact, and the output load should be checked against the amplifier's capacitive-drive and stability characteristics.
推薦
ADC and DAC Interface Buffering
The LT1639IS is useful for buffering sensor, mixer, or converter outputs where the next stage requires low-impedance drive and rail-to-rail output behavior. Its four channels can implement voltage followers, difference amplifiers, gain stages, and active filters around a converter. The 1.2 MHz bandwidth gives sufficient margin for many precision and audio-rate conversion systems, while the 0.4 V/us slew rate helps preserve low-frequency waveform amplitude. The application should be verified against converter settling requirements, output loading, and the amplifier's noise specifications. Keep routing short and provide clean grounding to avoid converter coupling into sensitive analog stages.
推薦
Active Filtering and Signal Conditioning
The four LT1639IS amplifier channels can implement low-pass, high-pass, or buffered multi-stage analog filters in precision control and measurement systems. A 1.2 MHz unity-gain bandwidth is appropriate for filters whose useful corner frequencies remain comfortably below the amplifier's closed-loop bandwidth at the selected gain. Rail-to-rail output capability can improve dynamic use of the available output range, although passive component tolerance and amplifier open-loop gain still determine filter accuracy. Use the datasheet's recommended noise-gain and capacitive-load guidance, place filter components close to the relevant pins, and simulate stability before fabrication, especially when driving long PCB traces or cable capacitance.
推薦
Industrial Control Signal Conditioning
The LT1639IS is appropriate for industrial control boards that process slow sensor signals, setpoint voltages, and actuator commands close to the available supply rails. Its four-channel arrangement supports local conditioning without distributing multiple separate amplifier packages across the board. Rail-to-rail input operation improves usefulness in low-voltage control systems, while the 1.2 MHz bandwidth and 0.4 V/us slew rate are more than adequate for many process-control signals rather than high-frequency communications. Confirm industrial temperature and ESD requirements in the exact orderable part, isolate high-noise switching paths, and use a solid analog ground strategy with local supply decoupling.
推薦
推薦產品摘要
工程參考資料，適用於 LT1639IS — 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 | LT1639IS#PBF | LT1639IS#TR | LT1639IS#TRPBF |
|---|---|---|---|---|
| Package | 14-SO surface-mount | 14-SO surface-mount | 14-SO surface-mount | 14-SO surface-mount |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Amplifier Configuration | Quad | Quad | Quad | Quad |
| Unity-Gain Bandwidth | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.2 MHz |
| Slew Rate | 0.4 V/us | 0.4 V/us | 0.4 V/us | 0.4 V/us |
| Input Common-Mode Range | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail |
| Output Swing | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail |
| Order Configuration | LT1639IS | Lead-free order code | Tape-and-reel order code | Tape-and-reel lead-free order code |
主要差異化特點
- Four amplifier channels in one 14-SO package (對比LT1639IS#PBF)
- Rail-to-rail input and output operation (對比LT1639IS#TR)
- 1.2 MHz bandwidth with 0.4 V/us slew rate (對比LT1639IS#TRPBF)
設計說明
Place the supply bypass capacitors directly beside the LT1639IS supply pins, with the shortest possible ground return. Use the package footprint and land pattern specified in the manufacturer datasheet, and keep the analog signal paths separate from switching or high-current traces. This is especially important because the LT1639IS combines four amplifiers in one small surface-mount package.
Do not assume that rail-to-rail input and output wording means the amplifier can accept every input or output voltage without limits. Check the datasheet input common-mode range, output swing, supply voltage, and maximum input voltage. Also verify the actual operating temperature and order-code requirements for the selected production part before releasing the design.
For gain, filtering, or driving long PCB traces, calculate the closed-loop bandwidth and stability margin using the selected feedback network. The 1.2 MHz unity-gain bandwidth and 0.4 V/us slew rate are adequate for many low-frequency and audio-band paths, but they do not guarantee stability with every external load. Keep feedback components close to the amplifier and evaluate capacitive loading in the final layout.
Estimate total power consumption from the supply voltage, quiescent current, four-channel operating state, and load current. The listed description identifies the LT1639IS as micropower, but the exact quiescent-current and maximum-output-current values must be taken from the manufacturer datasheet. Confirm that the power budget remains valid when all four channels are active.
合規資訊
The available product and distributor extracts identify the LT1639 family and orderable suffixes but do not explicitly state the individual compliance attributes. The #PBF and #TRPBF order codes indicate lead-free ordering variants, while standalone RoHS, REACH, halogen-free, and conflict-minerals status require confirmation from the manufacturer.
