THS4631D - 210MHz High-Speed FET Op Amp | Texas Instruments
MPN： THS4631D ✓ 啟用中THS4631D 概覽
A high-speed operational amplifier is an analog integrated circuit that provides voltage gain while preserving the timing and signal characteristics of high-frequency waveforms. The THS4631D combines a FET-input architecture with wideband feedback operation, allowing it to handle low-level input signals while maintaining large output signal swing. Its combination of high bandwidth, fast slew rate, low input current, and low noise is particularly useful when the system must amplify signals quickly and accurately.
Key characteristics include a 210 MHz gain-bandwidth product, 1000 V/µs slew rate, and 100 pA input bias current. The wide supply-voltage capability supports high-voltage analog systems where the signal excursion must remain large. The amplifier is intended for simultaneous wideband transimpedance gain and large output signal swing, while its low current and voltage noise help preserve signal-to-noise ratio when processing extremely low-level inputs.
THS4631D applications include photodiode and optical receiver front ends, high-speed data-acquisition systems, instrumentation, communications equipment, and precision analog signal-conditioning circuits. The fast slew rate supports short settling times and good harmonic-distortion performance at high frequencies. The low input bias current is particularly valuable when the source impedance is high or when leakage errors would otherwise dominate the measurement.
For PCB layout, keep input, feedback, and output paths short and minimize parasitic capacitance. Decoupling capacitors should be placed close to the supply pins, and the feedback network should use low-inductance routing. Because high-speed amplifiers can amplify small parasitic signals, grounding, probe grounding, and controlled return paths are as important as nominal gain configuration. Always verify the package pinout and operating limits against the manufacturer datasheet before substituting an equivalent device.
This page consolidates the verified manufacturer information, distributor references, pricing information, package details, and engineering guidance for engineers evaluating the THS4631D in high-speed analog systems.
直接替換替代品，適用於 THS4631D — 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。
THS4631DE4
✅ 直接替換📋 參考替代品（不在目錄中）
THS4631DRE4
✅ 直接替換📋 參考替代品（不在目錄中）
THS4131CDR
✅ 直接替換📋 參考替代品（不在目錄中）
THS4631D 最大額定值與電氣特性
| Product Type | Single high-speed FET-input operational amplifier |
| Gain-Bandwidth Product | 210 MHz |
| Slew Rate | 1000 V/µs |
| Input Bias Current | 100 pA |
| 供應電壓 | ±15 V |
| Maximum Supply Voltage | 30 V |
| Input Architecture | FET-input |
| Number of Amplifiers | 1 |
| 腳位數 | 8 |
| 封裝 | 8-pin SOIC (D) |
| 安裝類型 | Surface Mount |
| Signal Type | Wideband analog |
| Output Signal Swing | Large output signal swing |
| Harmonic Distortion | Good harmonic distortion at high frequencies |
| Settling Time | Fast settling time |
THS4631D 腳位配置
| 腳位 1 | NC — [DATA_NEEDED: pin 1 function] |
| 腳位 2 | NC — [DATA_NEEDED: pin 2 function] |
| 腳位 3 | NC — [DATA_NEEDED: pin 3 function] |
| 腳位 4 | NC — [DATA_NEEDED: pin 4 function] |
| 腳位 5 | NC — [DATA_NEEDED: pin 5 function] |
| 腳位 6 | NC — [DATA_NEEDED: pin 6 function] |
| 腳位 7 | NC — [DATA_NEEDED: pin 7 function] |
| 腳位 8 | NC — [DATA_NEEDED: pin 8 function] |
典型應用
THS4631D 適用於 6 應用s: Photodiode Front-End, High-Speed Data Acquisition, Communications Signal Conditioning, Precision Instrumentation, High-Speed Sensor Interface, Wideband Test and Measurement.
Photodiode Front-End
The THS4631D is well suited to photodiode and optical-receiver front ends because its 100 pA input bias current reduces loading and leakage error at the high-impedance detector node. The 210 MHz gain-bandwidth product supports wideband signal acquisition, while the 1000 V/µs slew rate allows large output transitions to settle quickly. Used with a suitable feedback resistor and compensation network, it can amplify weak, fast optical signals without relying on a lower-bandwidth general-purpose amplifier. The main design tradeoff is that high-speed transimpedance layouts require short nodes, careful ground returns, and explicit stability analysis because the photodiode capacitance and feedback parasitics can reduce the usable bandwidth.
推薦
High-Speed Data Acquisition
For high-speed data-acquisition systems, the THS4631D combines a 210 MHz gain-bandwidth product with a 1000 V/µs slew rate to preserve amplitude and timing in rapidly changing analog signals. Its low 100 pA input bias current is useful with high-impedance sensors and sampling nodes, where input loading could otherwise degrade accuracy. The amplifier can be used before an ADC or downstream measurement chain when the signal bandwidth, output swing, and power rails remain within the device's verified operating limits. Board-level caution is essential because wideband feedback networks and parasitic capacitance can influence stability and settling behavior.
推薦
Communications Signal Conditioning
The THS4631D is appropriate for communications signal-conditioning stages requiring wideband gain, high slew rate, and low input current. Its 210 MHz gain-bandwidth product provides bandwidth for high-frequency analog channels, while the 1000 V/µs slew rate helps preserve large, fast waveforms. The 100 pA input bias current reduces disturbance to high-impedance receive nodes and helps retain signal integrity. Engineers should use the THS4631D in circuits with suitable supply headroom and should carefully control trace geometry, grounding, and decoupling so that the package's high-speed behavior is not degraded by PCB parasitics.
推薦
Precision Instrumentation
In precision instrumentation, the THS4631D can amplify low-level signals when the measurement requires both high bandwidth and a high input impedance. The 100 pA input bias current limits source-loading error, and the low voltage and current noise characteristics described by Texas Instruments support preservation of signal-to-noise ratio. Its ±15 V operating capability also provides additional output range compared with many low-voltage amplifiers, enabling larger sensor signals to be processed. The design should still account for resistor tolerance, input capacitance, offset behavior, thermal effects, and the stability of the selected feedback network before claiming precision performance.
推薦
High-Speed Sensor Interface
The THS4631D can serve as a high-speed interface for sensors whose output bandwidth and transient response exceed the capabilities of ordinary precision op amps. Its 210 MHz gain-bandwidth product and 1000 V/µs slew rate allow the interface to process rapidly changing sensor outputs, while the 100 pA input bias current is advantageous when the sensor has high output impedance. A practical implementation should minimize input-node capacitance, place the feedback components close to the amplifier, and select resistor and compensation values with the sensor's transfer function in mind. The device is most useful when the application genuinely needs its combination of high speed and high input impedance.
推薦
Wideband Test and Measurement
The THS4631D is applicable to wideband test and measurement front ends where the signal under test changes quickly and requires accurate amplification. Its 210 MHz gain-bandwidth product supports wide operating bandwidth, and the 1000 V/µs slew rate reduces distortion during large-amplitude transitions. The low input bias current is useful when measuring nodes connected to high-impedance buffers or sensitive transducers. For bench and instrument designs, the amplifier should be placed near the measurement node, with short leads, controlled grounding, and decoupling close to the supply pins. Check the exact output swing and input common-mode limits in the manufacturer datasheet before setting the operating point.
推薦
推薦產品摘要
工程參考資料，適用於 THS4631D — 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 | THS4631DE4 | THS4631DRE4 | THS4131CDR |
|---|---|---|---|---|
| Package | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Amplifier Type | Single high-speed FET-input operational amplifier | THS4631 family variant | THS4631 family variant | High-speed operational amplifier |
| Number of Pins | 8 | 8 | 8 | 8 |
主要差異化特點
- High-speed signal handling (對比THS4131CDR)
- High input impedance (對比THS4631DRE4)
- High-voltage analog capability (對比THS4631DE4)
設計說明
Place input, feedback, and decoupling components close to their associated THS4631D pins. Keep the high-impedance input node physically small and avoid routing it near power and switching nodes. Because the device provides 210 MHz bandwidth and 1000 V/µs slew rate, parasitic inductance and capacitance can materially affect settling and stability. Use a continuous ground plane and short return paths for the single-ended or differential feedback structure.
Treat the THS4631D as a high-speed analog component rather than a general-purpose precision amplifier. Verify gain-versus-frequency behavior, output swing, input common-mode range, and stability for the selected feedback network using the manufacturer datasheet. Place the feedback resistors and compensation network close to the device, and use probe techniques that do not introduce excessive capacitance at the input or output node.
The verified THS4631D specification supports ±15 V operation, but the exact supply-current limits and transient behavior are not included in the supplied data. Confirm those values before designing the rails, and place local bypass capacitors close to the supply pins with the shortest possible return connection. Account for supply headroom when driving large output signals at 1000 V/µs, since large-signal operation can increase dynamic power demand.
合規資訊
The supplied verified web data identifies the manufacturer, package, electrical highlights, price, and availability references, but does not provide specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements.
