LT1055S8 - Precision High-Speed JFET Op Amp | Analog Devices
MPN： LT1055S8 ✓ 啟用中LT1055S8 概覽
An operational amplifier is an analog signal-processing integrated circuit that uses high-gain differential amplification and feedback to control gain, bandwidth, and output behavior. The LT1055S8 belongs to the JFET-input operational-amplifier family, a subcategory of precision amplifiers used when low input bias current and input capacitance are important. Its JFET input stage is appropriate for sensors, photodiodes, high-impedance transducers, and precision feedback networks where input bias current can create measurement errors.
Key specifications include a guaranteed offset voltage of 150 µV maximum, guaranteed drift of 4 µV/°C maximum, and guaranteed bias-current limits of 150 pA at 70°C and 2.5 nA at 125°C. The LT1055 family is also specified for 16 V/µs slew rate and 6.5 MHz gain-bandwidth product in the manufacturer product information. The SOIC-8 format supports conventional surface-mount assembly and is compatible with standard op-amp layouts when pin functions and supply requirements are confirmed.
Typical uses include precision instrumentation, low-level sensor interfaces, analog signal conditioning, active filters, sample-and-hold stages, and high-impedance buffer circuits. The device can also serve in test and measurement equipment where low offset and drift help preserve signal accuracy. Its high speed and low bias current provide useful flexibility when the signal source has high source impedance or when the application requires both DC precision and reasonable dynamic response.
The principal design consideration is verifying the exact pinout, supply voltage, output swing, input common-mode range, and stability requirements against the manufacturer datasheet before layout. A precision op-amp does not remove the need for suitable decoupling, clean grounding, feedback-component selection, and output-load compatibility. This page combines the verified manufacturer and distributor information with practical guidance for evaluating the LT1055S8 against same-package alternatives.
直接替換替代品，適用於 LT1055S8 — 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。
LT1055S8#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LT1055S8#TR
✅ 直接替換📋 參考替代品（不在目錄中）
LT1055S8#TRPBF
✅ 直接替換📋 參考替代品（不在目錄中）
LT1056S8
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LT1055S8#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LT1055S8 最大額定值與電氣特性
| Product Type | Precision, high-speed, JFET-input operational amplifier |
| Number of Circuits | 1 amplifier |
| 封裝 | 8-SOIC, 0.154 inch width, 3.90 mm width |
| Input Type | JFET input |
| Offset Voltage | 50 µV typical; 150 µV maximum |
| Offset Voltage Drift | 1.2 µV/°C typical; 4 µV/°C maximum |
| Input Bias Current | 40 pA at 70°C typical; 500 pA at 125°C typical |
| Guaranteed Bias Current | 150 pA at 70°C maximum; 2.5 nA at 125°C maximum |
| Slew Rate | 16 V/µs |
| Gain-Bandwidth Product | 6.5 MHz |
| Offset Voltage at 125°C | 500 µV maximum |
| Amplifier Type | J-FET |
| 安裝方式 | Surface mount |
| Manufacturer | Analog Devices, formerly Linear Technology |
LT1055S8 8-soic, 0.154 inch width, 3.90 mm width 腳位配置指南
LT1055S8（8-soic, 0.154 inch width, 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： LT1055S8.
請參閱 資料表 以查看完整腳位配置。
典型應用
LT1055S8 適用於 6 應用s: Precision Instrumentation Signal Conditioning, High-Impedance Sensor Interface, Precision Active Filter, Low-Level Analog Signal Buffer, Test and Measurement Front End, Data Acquisition and Sensor Conditioning.
Precision Instrumentation Signal Conditioning
The LT1055S8 fits precision instrumentation because it combines a 150 µV maximum guaranteed offset voltage with a 4 µV/°C maximum guaranteed drift. These characteristics reduce DC error when amplifying low-level sensor signals and help maintain calibration accuracy over temperature. Its 16 V/µs slew rate and 6.5 MHz gain-bandwidth product also allow the amplifier to respond to faster measurement events without abandoning precision. Place it in a standard noninverting or differential feedback network, keep the feedback loop compact, and verify the selected gain against the device's stability and bandwidth limits. Compared with a general-purpose precision amplifier, the LT1055S8 provides unusually low JFET bias current, which is valuable when the source impedance is high and input leakage would otherwise create a meaningful measurement error.
推薦
High-Impedance Sensor Interface
The LT1055S8 is appropriate for high-impedance sensor interfaces because its JFET input stage provides typical bias current of 40 pA at 70°C and 500 pA at 125°C. Those low values reduce the bias-current error associated with high source resistance and can be important in capacitive, electrostatic, photodiode, or electrometer-adjacent circuits. The 150 µV maximum offset and 6.5 MHz gain-bandwidth product allow the same stage to preserve small DC signals while processing a useful bandwidth range. The design should still minimize board leakage around sensitive inputs, use guarding where appropriate, and account for input capacitance and noise. Verify the input common-mode range and output swing in the manufacturer datasheet before selecting the feedback configuration.
推薦
Precision Active Filter
The LT1055S8 can implement precision active filters where component tolerances, amplifier offset, and temperature drift directly affect cutoff frequency or signal accuracy. Its 1.2 µV/°C typical drift and 4 µV/°C maximum guaranteed drift limit output-voltage movement, while the 6.5 MHz gain-bandwidth product leaves bandwidth for moderate-Q filter sections. The 150 µV maximum offset can also reduce DC feedthrough into the next stage. Choose resistor and capacitor values from the intended gain and bandwidth rather than treating the amplifier as ideal. Check loop-gain and phase margin at the lowest intended gain, because compensation requirements vary with noise gain. Stable layout, short feedback traces, and grounded unused inputs remain essential even when the filter itself is the primary precision element.
推薦
Low-Level Analog Signal Buffer
The LT1055S8 is well matched to buffering low-level analog signals where load drive, offset, and bias current must be balanced. The 16 V/µs slew rate supports faster large-signal transitions than a basic precision op amp, while the 6.5 MHz gain-bandwidth product provides useful closed-loop bandwidth. Its low JFET bias current avoids loading high-impedance sources more heavily than a bipolar-input amplifier might. In a voltage-follower or gain-of-minus-one arrangement, the device can isolate a sensor from the next filtering or conversion stage and reduce downstream loading. The implementation should confirm output-current capability, load capacitance, output swing, and stability into the intended load. A short output path and local decoupling help preserve the advertised dynamic performance.
推薦
Test and Measurement Front End
The LT1055S8 is useful in a test-and-measurement front end when the instrument must combine accurate DC behavior with adequate bandwidth. The 150 µV maximum offset and 4 µV/°C maximum drift help preserve measurement integrity, while the 16 V/µs slew rate improves response to rapidly changing test-node voltages. A typical use is conditioning a source before a sampler, comparator, or ADC input, or buffering an attenuator to prevent subsequent stages from loading it. The amplifier's 6.5 MHz gain-bandwidth product should be compared with the required closed-loop bandwidth and settling time. Account for input noise, parasitic capacitance, and resistor-network thermal noise when estimating total measurement error. Confirm stability for the selected noise gain and use a low-noise reference strategy when accuracy is dominated by the source.
推薦
Data Acquisition and Sensor Conditioning
The LT1055S8 supports data-acquisition designs that must preserve small sensor outputs while driving the input of an ADC or instrumentation block. Low bias current minimizes loading of high-resistance sensors, and the 150 µV maximum offset can be important when multiple amplifier stages contribute to the full-scale error budget. The 6.5 MHz gain-bandwidth product permits useful signal bandwidth, while the 16 V/µs slew rate helps reproduce rapidly changing inputs. Place the amplifier close to the source when source impedance is high, minimize input-node leakage, and use a feedback topology matched to the ADC input range. Verify ADC settling requirements, common-mode limits, and output swing, and include the amplifier's offset and drift in the calibration model when the acquisition chain is designed for high accuracy.
推薦
推薦產品摘要
工程參考資料，適用於 LT1055S8 — 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 | LT1055S8#PBF | LT1055S8#TR | LT1055S8#TRPBF | LT1056S8 | LT1055S8#PBF |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Amplifier Type | JFET-input precision operational amplifier | JFET-input precision operational amplifier | JFET-input precision operational amplifier | JFET-input precision operational amplifier | JFET-input precision operational amplifier | JFET-input precision operational amplifier |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 | 1 |
| Slew Rate | 16 V/µs | 16 V/µs | 16 V/µs | 16 V/µs | 16 V/µs family specification | 16 V/µs |
| Gain-Bandwidth Product | 6.5 MHz | 6.5 MHz | 6.5 MHz | 6.5 MHz | 6.5 MHz family specification | 6.5 MHz |
| Ordering Configuration | LT1055S8 | Lead-free orderable configuration | Tape-and-reel orderable configuration | Lead-free tape-and-reel orderable configuration | LT1056 family ordering configuration | Lead-free orderable configuration |
主要差異化特點
- Combines precision offset with high-speed dynamic performance (對比LT1056S8)
- Very low picoamp-class input bias current (對比LT1055S8#PBF)
- Guaranteed thermal-drift specification for precision designs (對比LT1055S8#TR)
- Single-amplifier 8-SOIC implementation (對比General-purpose dual and quad op-amp packages)
設計說明
Place the amplifier and its feedback components close together, especially when the selected noise gain is high or the source impedance is large. Keep sensitive input traces short, minimize parasitic capacitance at the input node, and avoid routing them beneath noisy switching nodes. The LT1055S8's low bias current does not remove sensitivity to board leakage or contamination; guarding and clean PCB assembly techniques can be as important as the nominal input specification.
Do not select the LT1055S8 from the headline gain-bandwidth and slew-rate figures alone. Confirm the exact supply voltage, input common-mode range, output swing, output-current capability, and compensation or stability requirements in the official datasheet. Also verify the exact ordering suffix, because LT1055S8, LT1055S8#PBF, LT1055S8#TR, and LT1055S8#TRPBF may differ in orderable packaging or termination while sharing the same electrical family.
Use short, direct feedback and output paths, and follow the manufacturer layout and decoupling guidance. At the specified 6.5 MHz gain-bandwidth product and 16 V/µs slew rate, parasitic capacitance, excessive output loading, and an unsuitable noise gain can alter settling behavior or stability. When driving an ADC or cable, compare the op amp's capacitive-load drive with the load and add only the compensation or isolation supported by the datasheet and application guidance.
Keep the power-supply return path low impedance and place the required bypass capacitors close to the device pins. The verified excerpts do not specify the supply range, total supply current, or recommended capacitance values, so those values must be taken from the official LT1055/LT1056 datasheet rather than copied from another op amp. Confirm that the selected supply voltage supports the required output swing and input common-mode operating region for the circuit.
合規資訊
The verified excerpts identify LT1055S8#PBF and related suffixes but do not explicitly provide compliance statements for the exact target MPN. The #PBF suffix commonly denotes a lead-free ordering configuration, but that convention is not treated as extracted compliance evidence. No AEC-Q100 qualification evidence was supplied.
