LT1639IN - Low-Power Quad Rail-to-Rail Op Amp | Analog Devices
Артикул: LT1639IN ✓ АктивенLT1639IN Обзор
An operational amplifier is an analog integrated circuit that uses high-gain differential feedback to amplify or buffer a voltage signal. Rail-to-rail input operation allows the amplifier to accept input voltages close to the supply rails, while rail-to-rail output operation supports output swings near those limits. Within the broader hierarchy, the LT1639IN is a precision amplifier, analog IC, and semiconductor designed for signal-chain applications.
Key characteristics include four amplifier channels, a 1.2 MHz gain-bandwidth product, 0.4 V/us slew rate, and a typical input bias current of 0.05 uA. These values position the device for low-power precision applications where low bias current, broad input range, and compact channel density are important. The operating temperature range is -40 C to +85 C.
The manufacturer describes the LT1639 family as a micropower, Over-The-Top rail-to-rail input and output operational amplifier family. Its low-power operating characteristics are valuable in battery-powered instrumentation, portable measurement systems, sensor interfaces, and low-voltage signal-processing equipment where every amplifier channel must operate from limited power budgets.
Typical applications include sensor-signal conditioning, low-frequency active filtering, instrumentation buffering, audio preamplification, and general-purpose analog gain stages. Four integrated channels can reduce the number of packages needed when several independent low-frequency signals must be amplified, buffered, or filtered on the same board.
Designers should pay close attention to unity-gain stability, load capacitance, output-current limits, input common-mode behavior, and the effects of the power-supply bypass network. Place input, output, and supply decoupling capacitors close to the device and maintain the required stability network values from the manufacturer datasheet.
This product page combines the LT1639IN manufacturer specifications with package information, design guidance, application patterns, and verified drop-in candidate analysis. It is intended to help engineers determine whether the low-power, four-channel, 14-pin PDIP amplifier fits a board-level replacement or new design.
Аналоги без доработки для LT1639IN — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
LT1639IN#PBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LT1639IN#TRPBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LT1639IN Максимальные параметры и электрические характеристики
| Amplifier Type | Low-power rail-to-rail input and output operational amplifier |
| Number of Channels | 4 channels |
| Gain-Bandwidth Product | 1.2 MHz |
| Slew Rate | 0.4 V/us |
| Input Bias Current | 0.05 uA |
| Common-Mode Rejection Ratio | 88 dB |
| Напряжение питания | 15 V |
| Input Common-Mode Range | Rail-to-rail |
| Output Swing | Rail-to-rail |
| Диапазон рабочих температур | -40 C to +85 C |
| Корпус | 14-PDIP, 0.300 inch, 7.62 mm |
| Terminal Count | 14 terminals |
| Способ монтажа | Through-hole |
| Product Category | Standard general-purpose amplifier |
| Temperature Grade | Industrial |
Конфигурация выводов LT1639IN
| Контакт 1 | OUTA — Amplifier A output |
| Контакт 2 | -INA — Amplifier A inverting input |
| Контакт 3 | +INA — Amplifier A non-inverting input |
| Контакт 4 | V- — Negative power supply |
| Контакт 5 | +INB — Amplifier B non-inverting input |
| Контакт 6 | -INB — Amplifier B inverting input |
| Контакт 7 | OUTB — Amplifier B output |
| Контакт 8 | OUTC — Amplifier C output |
| Контакт 9 | -INC — Amplifier C inverting input |
| Контакт 10 | +INC — Amplifier C non-inverting input |
| Контакт 11 | V+ — Positive power supply |
| Контакт 12 | -IND — Amplifier D inverting input |
| Контакт 13 | +IND — Amplifier D non-inverting input |
| Контакт 14 | OUTD — Amplifier D output |
Типичное применение
LT1639IN подходит для 6 применениеs: High-Impedance Sensor Signal Conditioning, Portable Battery-Powered Instrumentation, Low-Frequency Active Filtering, Audio Preamplification, Industrial Control Signal Conditioning, General-Purpose Analog Signal Buffering.
High-Impedance Sensor Signal Conditioning
The LT1639IN fits low-frequency sensor-conditioning chains where input loading must remain small. Its published 0.05 uA input bias current helps a high-impedance sensor retain usable signal amplitude, while the 1.2 MHz gain-bandwidth product provides more bandwidth than is normally required for slow temperature, pressure, or position measurements. Four channels allow related sensor signals to be amplified or buffered without using four separate packages. Rail-to-rail input operation is useful when the sensor output can move close to a supply rail. The amplifier remains best suited to low-frequency precision paths rather than wideband sensing.
Рекомендуется
Portable Battery-Powered Instrumentation
The LT1639IN is appropriate for portable instrumentation because it combines four amplifier channels with low-power characteristics in a 14-pin PDIP package. The 0.05 uA input bias current limits the load presented to battery-powered sensing circuits, while the 1.2 MHz gain-bandwidth product is suitable for many low-frequency measurement channels. Rail-to-rail input and output behavior provides useful signal range in systems where supply voltage is constrained. The design should still include local supply bypassing and verify actual supply and load-current limits for the selected operating conditions.
Рекомендуется
Low-Frequency Active Filtering
The LT1639IN can implement several low-frequency active-filter stages when a design needs rail-to-rail signal handling and low input bias current. Its 1.2 MHz gain-bandwidth product leaves bandwidth available for moderate closed-loop gains and filter corner frequencies, while the 0.4 V/us slew rate helps support small-signal waveform reproduction. Four channels make cascading sections or parallel filter paths practical in one package. Component tolerances and amplifier noise determine achievable filter accuracy, so the gain network should be calculated against the manufacturer’s recommended operating region.
Рекомендуется
Audio Preamplification
The LT1639IN is suitable for audio preamplifier and line-stage applications operating within its low-frequency bandwidth. The rail-to-rail input stage accepts signals near the supply limits, and the 0.4 V/us slew rate provides useful dynamic behavior for low-level audio signals. Its four channels can support mixer inputs, microphone preamplifiers, or line-level buffers within one DIP package. Actual signal bandwidth, output swing, load, and distortion requirements should be checked against the manufacturer data before deployment in high-fidelity equipment.
Рекомендуется
Industrial Control Signal Conditioning
The LT1639IN supports industrial control boards that must amplify low-level signals from sensors, transducers, or conditioning networks. The -40 C to +85 C industrial temperature range and four independent channels suit equipment requiring several precision amplifier functions. Its 88 dB common-mode rejection ratio can help reduce rejection of equal-magnitude interference when the signal is referenced to a common ground. Rail-to-rail operation increases usable range near the supply limits. Designers should preserve the ground-reference architecture and use suitable filtering and shielding for electrically noisy environments.
Рекомендуется
General-Purpose Analog Signal Buffering
The LT1639IN is well suited to buffering four low-frequency analog nodes when the existing PCB uses a 14-pin PDIP footprint. Its rail-to-rail input and output behavior reduces restrictions on source and destination voltage levels, and the 1.2 MHz gain-bandwidth product is ample for many measurement and control signals. The four-channel arrangement simplifies board partitioning and can reduce the number of amplifier packages. Use unity-gain or low-gain configurations only where the selected feedback network maintains stable operation under the actual load capacitance.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LT1639IN — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LT1639IN#PBF | LT1639IN#TRPBF |
|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Package | 14-PDIP (0.300, 7.62 mm) | 14-PDIP (0.300, 7.62 mm) | 14-PDIP (0.300, 7.62 mm) |
| Number of Channels | 4 | 4 | 4 |
| Gain-Bandwidth Product | 1.2 MHz | 1.2 MHz | 1.2 MHz |
| Slew Rate | 0.4 V/us | 0.4 V/us | 0.4 V/us |
| Input Bias Current | 0.05 uA | 0.05 uA | 0.05 uA |
| Common-Mode Rejection Ratio | 88 dB | 88 dB | 88 dB |
| Operating Temperature Range | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Input and Output Range | Rail-to-rail input and output | Rail-to-rail input and output | Rail-to-rail input and output |
| Orderable Packaging Form | 14-PDIP | 14-PDIP, lead-free ordering option | 14-PDIP, tape-and-reel ordering option |
Ключевые отличия
- Four amplifier channels in one through-hole package (против LT1639IN#PBF)
- Rail-to-rail input and output operation (против LT1639IN#TRPBF)
- Low input bias current for precision signal paths (против LT1639IN#PBF)
- 1.2 MHz gain-bandwidth product with 0.4 V/us slew rate (против LT1639IN#TRPBF)
Заметки по проектированию
Place the supply bypass capacitor adjacent to the V+ and V- pins and keep the feedback, input, and output traces short. A long ground return beneath the amplifier can add disturbance to a low-level signal path. Because the LT1639IN uses a through-hole PDIP footprint, route the four amplifier channels in logical channel order and preserve clearances around adjacent pins to simplify assembly and inspection.
The 1.2 MHz gain-bandwidth product makes the LT1639IN primarily suitable for low-frequency and moderate-bandwidth precision stages. Select feedback values that provide the intended closed-loop gain without placing the amplifier near its stability boundary. Check output drive against the connected load and use an isolation resistor when driving capacitive loads; the manufacturer characteristic curves should guide compensation or gain adjustment.
Do not treat rail-to-rail input and output as an unlimited range. The usable input and output range still depends on supply voltage, common-mode limits, output load, and channel-to-channel behavior. Verify those conditions in the electrical-characteristics tables. For high-impedance sensors, guard routing, clean grounding, and the published 0.05 uA input bias current remain important because input leakage can create errors comparable to the sensor signal.
The LT1639IN supports a published 15 V supply condition, but a robust design should use separate local bypass paths for the positive and negative supplies. Confirm the exact operating supply range, quiescent current, output-current capability, and stability requirements in the manufacturer datasheet before committing the power architecture. This is especially important when a single supply is transformed into split rails for bipolar-style signal conditioning.
Информация о соответствии
The target ordering code is not identified as an automotive-qualified AEC-Q100 device. Compliance fields remain unknown because the verified product excerpts do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status.
