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Texas Instruments THS4631DR
- Part No.:
- THS4631DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4631DR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,753
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Product details
Overview
THS4631DR from Texas Instruments is a high-voltage, FET-input operational amplifier optimized for wideband transimpedance gain stages, photodiode amplification, and high-speed signal conditioning. It delivers 210MHz gain bandwidth product, ±15V supply operation, 1000V/µs slew rate at G = 5, 7nV/√Hz input voltage noise, and 100pA maximum input bias current - enabling low-noise, high-swing amplification of weak capacitive current sources in optical sensing systems.
For engineers reviewing the THS4631DR datasheet, THS4631DR pinout, THS4631DR application, or THS4631DR equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for high-bandwidth, high-impedance analog signal chains requiring stable DC precision and fast settling.
Technical Context
The THS4631DR employs a voltage-feedback architecture with JFET input stage to achieve simultaneous high input impedance (10⁹ Ω || 3.9pF), low input bias current (≤100pA), and wideband performance up to 325MHz in unity gain. Its 210MHz gain bandwidth product and 1000V/µs slew rate support fast large-signal settling in transimpedance configurations with feedback resistors ≥499Ω and source capacitances up to several pF.
Designed for dual-supply operation from ±5V to ±15V, the device maintains ≤500µV input offset voltage and ±2.5µV/°C drift over temperature while delivering ±13.5V output swing into 1kΩ and 95mA output current - making it suitable for driving moderate loads in test equipment and photodiode front-ends without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 210MHz - enables stable transimpedance gain ≥20 with flat frequency response up to 10MHz when properly compensated |
| Slew Rate (G = 5) | 1000V/µs - supports <40ns 0.1% settling for 2V step outputs, critical for pulse-shaped photodiode signals |
| Input Voltage Noise | 7nV/√Hz - lower than comparable high-speed op-amps, preserving SNR in low-level current-to-voltage conversion |
| Input Bias Current | ≤100pA - minimizes error in high-RF transimpedance designs where IB×RF offsets dominate |
| Supply Voltage Range | ±5V to ±15V - supports wide dynamic range output swing (±13.5V into 1kΩ) for high-fidelity signal capture |
| Small-Signal Bandwidth (G = 1) | 325MHz - allows unity-gain buffering of RF/IF signals up to UHF without phase degradation |
| Harmonic Distortion (5MHz) | –76dB SFDR at 1kΩ load - ensures clean spectral integrity in test & measurement instrumentation |
Pinout & Package
The THS4631DR is packaged in an 8-pin SOIC (D) with 4.9mm × 6mm footprint and standard JEDEC outline. Thermal pad is not present in this variant (only DDA and DGN packages include PowerPAD™).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | No Connect (NC) | Internally unconnected; must be left floating or tied to ground per layout best practices |
| 2 | VIN– | Inverting input - primary node for transimpedance feedback network connection |
| 3 | VIN+ | Noninverting input - typically grounded or biased for single-ended operation |
| 4 | VS– | Negative power supply - requires low-ESR decoupling ≤10cm from pin |
| 6 | VOUT | Amplifier output - drives RL directly; capable of ±13.5V swing into 1kΩ |
| 7 | VS+ | Positive power supply - requires symmetric decoupling to VS– for optimal PSRR |
Key Features
| Feature | Design Value |
|---|---|
| FET-input topology | Enables ≤100pA input bias current and 10⁹ Ω || 3.9pF input impedance - essential for low-error photodiode current-to-voltage conversion |
| High slew rate + GBW synergy | 1000V/µs slew rate with 210MHz GBW permits simultaneous high gain, wide bandwidth, and fast settling - unlike conventional trade-off-limited amplifiers |
| Low-noise precision | 7nV/√Hz voltage noise + ≤500µV offset + ±2.5µV/°C drift - preserves DC accuracy and dynamic range in wideband active filtering and integrator applications |
| High-output drive capability | ±13.5V swing into 1kΩ and 95mA output current - eliminates need for external output buffers in DAC output stages and test system drivers |
| Wide supply flexibility | Operates from ±5V to ±15V dual supply or 10V–30V single supply - simplifies integration into mixed-rail industrial and instrumentation platforms |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
Use Scenario: Amplifying low-level, high-frequency photocurrent from avalanche photodiodes (APDs) in fiber-optic receivers and LIDAR front-ends. IC Role / Device Role / Timing Role: Primary transimpedance amplifier converting pA–nA photocurrent into clean, wideband voltage output with minimal added noise or distortion. Use Value: 7nV/√Hz input voltage noise and ≤100pA bias current preserve signal-to-noise ratio; 210MHz GBW supports >100MHz optical data rates with <1% gain error. |
Use Scenario: Converting DAC output current or sensor current into high-fidelity voltage signals in automated test equipment (ATE) and high-speed data acquisition. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with programmable gain via RF selection, operating across DC to 50MHz. Use Value: 1000V/µs slew rate ensures <50ns full-scale settling; ±15V supply enables ±12V output compliance for driving ADC reference inputs or coaxial cables. |
| Test and Measurement Systems | High-Impedance Buffer |
Use Scenario: Signal conditioning path in oscilloscope front-ends, spectrum analyzer preamps, and arbitrary waveform generator outputs. IC Role / Device Role / Timing Role: Wideband gain block providing flat frequency response, low distortion, and high output drive before digitization or transmission. Use Value: –76dB SFDR at 5MHz and 325MHz unity-gain bandwidth ensure accurate amplitude and phase fidelity for calibration-grade instruments. |
Use Scenario: Isolating high-impedance sensors (e.g., pH electrodes, piezoelectric transducers) from downstream circuitry without loading or signal degradation. IC Role / Device Role / Timing Role: Unity-gain buffer maintaining signal integrity across DC–100MHz while presenting >1GΩ input impedance. Use Value: 10⁹ Ω || 3.9pF input impedance prevents sensor discharge; low 2.5µV/°C offset drift ensures long-term DC stability in precision monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, FET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA656 | Lower slew rate (400V/µs), higher voltage noise (6nV/√Hz), narrower supply range (±5V only) | Better suited for low-power, medium-bandwidth applications where thermal headroom is constrained | Select OPA656 when supply voltage is limited to ±5V and 1000V/µs slew is unnecessary |
| THS4601 | Lower GBW (180MHz), lower slew rate (100V/µs), same ±15V supply and FET input | Optimized for cost-sensitive, lower-speed transimpedance designs where bandwidth ≤50MHz suffices | Select THS4601 when bandwidth requirements are ≤60MHz and ultra-fast settling is not required |
Compared with OPA656 and THS4601, the THS4631DR uniquely combines 210MHz GBW, 1000V/µs slew rate, and ±15V operation - making it the only option among the three capable of sustaining >100MHz closed-loop bandwidth with fast large-signal response in high-dynamic-range photodiode and test equipment signal paths.
Availability
THS4631DR is available at Aetrix Electronics and suitable for wideband photodiode amplification, high-speed transimpedance gain stages, and test and measurement systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for THS4631DR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in high-performance op-amps, data converters, and power management ICs.
The THS4631DR belongs to TI's high-speed precision op-amp product line, engineered specifically for wideband current-to-voltage conversion, optical sensing, and instrumentation applications demanding both speed and DC accuracy.
FAQ
What is the maximum recommended supply voltage for THS4631DR?
The THS4631DR supports dual-supply operation from ±5V to ±15V, with absolute maximum rating of ±16.5V. Operation beyond ±15V risks exceeding junction temperature limits and degrading long-term reliability. For robust design, TI specifies ±15V as the maximum recommended operating condition - confirmed in Section 6.3 of the SLOS451D datasheet.
Does THS4631DR require external compensation for stability in transimpedance applications?
Yes, the THS4631DR requires external feedback capacitor (CF) in transimpedance configurations to ensure stability. CF value depends on photodiode capacitance and feedback resistor (RF); typical values range from 2.2pF to 8.2pF. Equation 3 in the datasheet (CF ≈ 1/√(2π·RF·GBP)) provides the starting point, with lab tuning needed for optimal flatness and settling.
Can THS4631DR drive a 50Ω coaxial cable directly?
The THS4631DR can drive 50Ω loads with ±10V output swing (per Section 6.5), but sustained 50Ω operation increases power dissipation and may exceed thermal limits without proper PCB copper area. For continuous 50Ω driving, use series 45Ω isolation resistor to limit current and maintain stability - as demonstrated in TI's application note SLOA114.
What is the input common-mode voltage range for THS4631DR at ±15V supply?
At ±15V supply, the THS4631DR supports input common-mode voltage from –13V to +12V (min/max), with typical range of –12.5V to +11.5V. This rail-to-rail input capability enables direct interfacing with photodiode bias networks and single-ended sensor outputs without level-shifting circuitry.
Is THS4631DR pin-compatible with other TI high-speed op-amps like OPA656?
No, THS4631DR is not pin-compatible with OPA656. While both are 8-pin SOIC devices, THS4631DR has NC pins at positions 1, 5, and 8, whereas OPA656 uses all eight pins functionally (including enable and compensation pins). Direct replacement would require PCB redesign and layout validation.
THS4631DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1000V/µs
- Gain Bandwidth Product:
- 210 MHz
- -3db Bandwidth:
- 325 MHz
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 260 µV
- Current - Supply:
- 11.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS4631DR FAQ
1.How can I place an order for THS4631DR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4631DR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for THS4631DR reliable?
The price and inventory of THS4631DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4631DR is usually 5 days.
3.What payment methods are accepted for THS4631DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4631DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4631DR?
THS4631DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4631DR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for THS4631DR?
For technical support, including THS4631DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4631DR requirements.
6.How does Aetrix verify that THS4631DR is sourced from the original manufacturer or authorized distributors?
All THS4631DR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that THS4631DR meets industry standards.
7.What is the process for return or replacement of THS4631DR?
All THS4631DR units undergo pre-shipment inspection (PSI). If there is an issue with THS4631DR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The THS4631DR part is unused and in its original packaging.
Return procedure for THS4631DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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