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Texas Instruments THS4631DE4
- Part No.:
- THS4631DE4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4631DE4.pdf
- Description:
- HIGH SPEED FET-INPUT OPERATIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
THS4631DE4 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 current signals in optical sensing and test equipment.
For engineers reviewing the THS4631DE4 datasheet, THS4631DE4 pinout, THS4631DE4 application, or THS4631DE4 equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for photodiode transimpedance, high-impedance buffering, and wideband active filtering designs.
Technical Context
The THS4631DE4 employs a voltage-feedback architecture with FET-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 settling (<40ns to 0.1%) and low harmonic distortion (–76dB SFDR at 5MHz) under ±15V supplies.
Thermal design is enabled by PowerPAD™ integration in SOIC-8 (D) package variants, with RθJA = 120.8°C/W and RθJB = 68.2°C/W. The device operates across –40°C to +85°C and supports dual-supply (±5V to ±15V) or single-supply (10V to 30V) configurations without performance degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 210MHz - enables stable transimpedance gains ≥20 while preserving bandwidth for photodiode current-to-voltage conversion |
| Slew Rate (G = 5) | 1000V/µs - ensures <40ns 0.1% settling for 2V step outputs, critical for pulse fidelity in test & measurement systems |
| Input Voltage Noise | 7nV/√Hz - maintains high signal-to-noise ratio when amplifying sub-nA photodiode currents |
| Input Bias Current | ≤100pA - minimizes DC error in high-impedance sensor interfaces and transimpedance circuits |
| Supply Voltage Range | ±5V to ±15V - supports rail-to-rail output swing up to ±13.5V into 1kΩ, enabling wide dynamic range in analog front-ends |
| Small-Signal Bandwidth (G = 1) | 325MHz - allows direct unity-gain buffering of RF and high-speed video signals without phase loss |
| Harmonic Distortion (5MHz) | –76dBc (2nd), –94dBc (3rd) at 1kΩ load - preserves spectral purity in active filtering and DAC output buffering |
Pinout & Package
The THS4631DE4 is packaged in an 8-pin SOIC (D) with exposed thermal pad (PowerPAD™). This variant uses standard SOIC footprint (4.9mm × 6mm) and requires PCB copper pour connected to ground for optimal thermal performance (RθJB = 68.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | No internal connection | Unused pins - must be left floating or tied to ground per layout guidelines; no electrical function |
| 2 | Inverting input (VIN–) | Primary feedback node for transimpedance and inverting amplifier configurations |
| 3 | Noninverting input (VIN+) | High-impedance reference node; used for biasing, offset nulling, or noninverting gain |
| 4 | Negative supply (VS–) | Connects to negative rail (e.g., –15V); decoupling capacitor required within 1cm |
| 6 | Output (VOUT–) | Capable of ±13.5V swing into 1kΩ and sourcing/sinking ≥90mA across temperature |
| 7 | Positive supply (VS+) | Connects to positive rail (e.g., +15V); decoupling capacitor required within 1cm |
Key Features
| Feature | Design Value |
|---|---|
| FET-input topology | 10⁹ Ω || 3.9pF input impedance and ≤100pA bias current enable accurate transimpedance gain without loading high-Z sensors |
| High slew rate + GBW synergy | 1000V/µs slew rate paired with 210MHz GBW allows full-power bandwidth >100MHz at G = 5, supporting fast pulse amplification |
| Low-noise precision | 7nV/√Hz voltage noise + 20fA/√Hz current noise yields optimal SNR for sub-µV-level signal recovery in optical monitoring |
| Wide supply flexibility | Operates from ±5V to ±15V or 10V–30V single supply - simplifies system power architecture in mixed-signal test equipment |
| Thermally enhanced SOIC | PowerPAD™ thermal pad reduces junction-to-board resistance to 68.2°C/W, enabling sustained 95mA output current at 85°C ambient |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
Use Scenario: Amplifying low-current output from fast-response photodiodes in fiber-optic receivers and laser rangefinders. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal phase delay and overshoot. Use Value: 325MHz unity-gain bandwidth and 1000V/µs slew rate preserve nanosecond-scale optical pulse edges while maintaining –76dB SFDR at 5MHz. |
Use Scenario: Converting DAC output current to high-fidelity voltage in high-speed arbitrary waveform generators. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with low input bias current and high output drive capability. Use Value: ≤100pA input bias current prevents gain error in high-RF configurations; ±13.5V swing into 1kΩ supports 20Vpp signal generation. |
| Test and Measurement Systems | Active Filtering |
Use Scenario: Front-end amplification in oscilloscope channels and spectrum analyzer IF stages requiring wide dynamic range. IC Role / Device Role / Timing Role: High-linearity buffer and gain stage handling multi-Vpp signals up to 100MHz without clipping or distortion. Use Value: –94dBc third-harmonic distortion at 5MHz and 210MHz GBW enable clean frequency-domain analysis of complex waveforms. |
Use Scenario: Implementing 4th-order Sallen-Key or multiple-feedback filters in medical imaging and communications equipment. IC Role / Device Role / Timing Role: Low-noise, high-output-current op-amp serving as active filter integrator and gain element. Use Value: 7nV/√Hz noise floor and 95mA output current allow steep roll-off filters to maintain SNR and drive capacitive loads without instability. |
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 |
|---|---|---|---|
| OPA657 | Higher GBW (1600MHz) but lower supply voltage (±5V max), higher input voltage noise (4.8nV/√Hz), and no ±15V operation | Better suited for ultra-wideband RF gain where high-voltage swing is unnecessary | Select OPA657 only when bandwidth >500MHz is required and supply rails are limited to ≤±5V |
| THS4601 | Lower GBW (180MHz), lower slew rate (100V/µs), same ±15V supply and FET input, but 5.4nV/√Hz noise | Targeted at cost-sensitive, lower-speed transimpedance applications where slew-induced distortion is not critical | Choose THS4601 when 100V/µs slew rate suffices and budget constraints outweigh need for 10× faster settling |
Compared with OPA657 and THS4601, the THS4631DE4 uniquely balances ±15V operation, 210MHz GBW, and 1000V/µs slew rate - making it the only option among the three capable of driving high-voltage, high-bandwidth photodiode signals without external level-shifting or gain staging.
Availability
THS4631DE4 is available at Aetrix Electronics and suitable for wideband photodiode amplifiers, high-speed transimpedance gain stages, and active filtering applications requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.
Supply support for THS4631DE4 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 leader specializing in analog and embedded processing technologies, with over 50 years of innovation in precision amplifiers and high-speed signal chain solutions.
The THS4631DE4 belongs to TI's high-voltage, high-speed FET-input op-amp product line, engineered specifically for photodiode transimpedance, optical sensing, and test equipment front-ends demanding wide bandwidth, low noise, and rail-compatible output swing.
FAQ
What is the maximum supply voltage rating for THS4631DE4?
The THS4631DE4 has an absolute maximum supply voltage of ±16.5V, with recommended operating range of ±5V to ±15V for dual supply or 10V to 30V for single supply. Operation beyond ±15V reduces reliability and is not characterized; sustained use at ±16.5V violates recommended conditions and risks permanent damage per TI's SLOS451D datasheet Section 6.1.
Does THS4631DE4 support unity-gain stable operation?
Yes, the THS4631DE4 is unity-gain stable, delivering 325MHz small-signal bandwidth at G = 1 with RF = 0Ω and VO = 200mVPP. Its voltage-feedback architecture and internal compensation ensure stability without external components across all gains ≥1, as confirmed in Section 6.5 of the SLOS451D datasheet.
What is the purpose of pins 1, 5, and 8 on THS4631DE4?
Pins 1, 5, and 8 on the THS4631DE4 are no-connect (NC) terminals with no internal silicon connection. They must remain unconnected or be tied to ground for mechanical stability and EMI reduction - but they serve no electrical function in signal path, power, or control. This is explicitly documented in Section 5 (Pin Configuration Functions) of the TI datasheet.
How does THS4631DE4 perform in transimpedance applications with photodiodes?
The THS4631DE4 excels in photodiode transimpedance applications due to its 100pA max input bias current, 7nV/√Hz input voltage noise, and 210MHz gain bandwidth product - enabling high-gain, wideband current-to-voltage conversion with minimal DC error and preserved pulse fidelity. Application note SLOS451D Section 8.2.1 validates its use with CF-optimized layouts achieving flat bandwidth up to 105MHz.
Is thermal pad connection required for THS4631DE4 in SOIC-8 (D) package?
Yes, the THS4631DE4 in SOIC-8 (D) package includes an exposed thermal pad (PowerPAD™) that must be soldered to a PCB copper pour connected to ground. This reduces RθJB from 120.8°C/W to 68.2°C/W, enabling reliable 95mA continuous output current at 85°C ambient - as specified in Section 6.4 Thermal Information of the official datasheet.
THS4631DE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- 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:
- 98 mA
- 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
THS4631DE4 FAQ
1.How can I place an order for THS4631DE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4631DE4 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 THS4631DE4 reliable?
The price and inventory of THS4631DE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4631DE4 is usually 5 days.
3.What payment methods are accepted for THS4631DE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4631DE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4631DE4?
THS4631DE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4631DE4 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 THS4631DE4?
For technical support, including THS4631DE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4631DE4 requirements.
6.How does Aetrix verify that THS4631DE4 is sourced from the original manufacturer or authorized distributors?
All THS4631DE4 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 THS4631DE4 meets industry standards.
7.What is the process for return or replacement of THS4631DE4?
All THS4631DE4 units undergo pre-shipment inspection (PSI). If there is an issue with THS4631DE4, 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 THS4631DE4 part is unused and in its original packaging.
Return procedure for THS4631DE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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