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Texas Instruments THS4631DDAR
- Part No.:
- THS4631DDAR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4631DDAR.pdf
- Description:
- IC OPAMP GP 1 CIRC 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:1,371
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Product details
Overview
THS4631DDAR 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-mode signals in optical and test equipment.
For engineers reviewing the THS4631DDAR datasheet, THS4631DDAR pinout, THS4631DDAR application, or THS4631DDAR equivalent, this page provides verified specifications, SOIC-8 package details, real-world photodiode and DAC buffer use cases, and two validated alternative op-amps with documented functional trade-offs.
Technical Context
The THS4631DDAR employs a unity-gain-stable voltage-feedback architecture with JFET input stage, supporting stable operation up to 325MHz at G = 1 while maintaining 1000V/µs slew rate and –76dB SFDR at 5MHz. Its 10⁹Ω || 3.9pF input impedance minimizes loading on high-impedance sources like photodiodes and piezoelectric sensors.
Designed for ±5V to ±15V dual-supply operation (or 10V–30V single-supply), it achieves 95mA output drive into 1kΩ and ±13.5V swing, with thermal performance characterized by RθJA = 120.8°C/W in SOIC-8. The device features trimmed DC precision: ±500µV max input offset voltage and ±2.5µV/°C drift over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 210MHz - enables stable transimpedance gain ≥20 with >100MHz closed-loop bandwidth |
| Slew Rate (G = 5) | 1000V/µs - supports <40ns settling to 0.1% for 2V step, critical for fast pulse response |
| Input Voltage Noise | 7nV/√Hz - low enough to preserve SNR when amplifying µA-level photodiode currents |
| Input Bias Current | 100pA max - ensures minimal error in high-Z transimpedance circuits with RF ≥1MΩ |
| Supply Voltage Range | ±5V to ±15V - allows ±13.5V output swing into 1kΩ, supporting wide dynamic range |
| Small-Signal Bandwidth (G = 1) | 325MHz - supports ultra-wideband AC-coupled signal paths without peaking compensation |
| Harmonic Distortion (5MHz) | –76dBc (2nd), –94dBc (3rd) at RL = 1kΩ - maintains fidelity in high-frequency instrumentation |
Pinout & Package
THS4631DDAR is housed in an 8-pin SOIC (D) package (4.9mm × 6mm), with exposed thermal pad electrically isolated and recommended for grounding. Pin 1, 5, and 8 are no-connect terminals; active pins follow standard op-amp configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No internal connection | Unused; must be left floating or tied to ground per layout best practice |
| Pin 2 (VIN–) | Inverting input | Primary node for transimpedance feedback network (RF/CF); high-Z, low-bias path |
| Pin 3 (VIN+) | Noninverting input | DC bias reference point; typically connected to VBIAS or ground in photodiode circuits |
| Pin 4 (VS–) | Negative power supply | Accepts –5V to –15V; requires low-ESR bypass capacitor near pin |
| Pin 5 | No internal connection | Unused; no internal silicon connection |
| Pin 6 (VOUT) | Amplifier output | Capable of ±13.5V swing into 1kΩ; drives capacitive loads up to 100pF with RISO |
| Pin 7 (VS+) | Positive power supply | Accepts +5V to +15V; decoupling critical for stability above 100MHz |
| Pin 8 | No internal connection | Unused; not bonded internally |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | 10⁹Ω || 3.9pF input impedance enables accurate transimpedance conversion without bias-current-induced gain error |
| High slew rate + GBW synergy | 1000V/µs slew rate with 210MHz GBW allows simultaneous high gain and wide bandwidth - e.g., 100× gain with >2MHz flat response |
| Low-noise, high-voltage operation | 7nV/√Hz voltage noise + ±15V supplies support high-fidelity amplification of low-level signals while delivering large output swings |
| Trimmed DC precision | ±500µV max input offset and ±2.5µV/°C drift ensure stable baseline in long-duration optical monitoring applications |
| Robust output drive | 95mA continuous output current and ±13.5V swing into 1kΩ enable direct driving of ADC inputs or coaxial cables without buffering |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
|
Use Scenario: Amplifying nanoampere-level photocurrent from fast-response PIN photodiodes in fiber-optic receivers or LIDAR front-ends. IC Role / Device Role / Timing Role: Transimpedance amplifier converting diode current to voltage with minimal added noise and phase distortion. Use Value: 100pA input bias current prevents gain error in high-RF configurations; 325MHz G=1 bandwidth preserves rise time of sub-nanosecond optical pulses. |
Use Scenario: Converting DAC output current (e.g., from high-speed current-steering DACs) into clean, wideband voltage signals for RF waveform generation. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with fast settling and low harmonic distortion. Use Value: 1000V/µs slew rate ensures <40ns 0.1% settling for 2V steps; –76dB SFDR at 5MHz maintains spectral purity in IF/RF synthesis. |
| Test and Measurement Systems | Active Filtering |
|
Use Scenario: Front-end gain block in oscilloscope channels, spectrum analyzers, or arbitrary waveform generators requiring wide dynamic range and low distortion. IC Role / Device Role / Timing Role: High-fidelity signal conditioner providing gain, buffering, and drive capability before digitization or further processing. Use Value: ±15V supplies enable ±13.5V output swing into 1kΩ, supporting full-scale analog input ranges; 210MHz GBW supports >100MHz measurement bandwidth. |
Use Scenario: Implementing 4th-order active low-pass or band-pass filters in medical imaging or communications equipment where phase linearity and stopband rejection matter. IC Role / Device Role / Timing Role: High-speed, low-noise op-amp in multiple feedback (MFB) or state-variable filter topologies. Use Value: Unity-gain stability and 325MHz bandwidth allow filter corner frequencies up to 50MHz with minimal passband ripple; 7nV/√Hz noise avoids degrading SNR in multi-stage designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed FET-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA657IDBVR | Higher 1.6GHz GBW but lower 700V/µs slew rate; 4.8nV/√Hz noise; ±5V max supply | Better for GHz-range small-signal amplification; unsuitable for ±15V systems or high-swing transimpedance | Select OPA657IDBVR only when bandwidth >500MHz is required and supply is limited to ±5V |
| THS4601ID | 180MHz GBW, 100V/µs slew rate, 5.4nV/√Hz noise, same ±15V supply range | Lower speed and slew limit use in >10MHz photodiode or DAC buffer applications | Choose THS4601ID for cost-sensitive, lower-bandwidth designs where 100V/µs slew suffices |
Compared with THS4631DDAR, OPA657IDBVR trades supply voltage headroom and slew rate for extreme bandwidth, while THS4601ID sacrifices speed and slew for lower noise and cost - making THS4631DDAR the balanced choice for ±15V, >100MHz transimpedance and high-fidelity signal conditioning.
Availability
THS4631DDAR is available at Aetrix Electronics and suitable for wideband photodiode amplifiers, high-speed DAC output buffering, and test-and-measurement front-ends requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for THS4631DDAR 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 decades of expertise in high-performance op-amps and precision signal-chain solutions.
The THS4631DDAR belongs to TI's high-speed FET-input op-amp product line, engineered specifically for wideband transimpedance amplification, optical sensing, and high-fidelity instrumentation where low bias current, high slew rate, and wide supply range are essential.
FAQ
What is the maximum supply voltage rating for THS4631DDAR?
The THS4631DDAR has an absolute maximum supply voltage of ±16.5V, with recommended operating range of ±5V to ±15V. Operation beyond ±15V risks exceeding junction temperature limits and reducing long-term reliability. At ±15V, it delivers ±13.5V output swing into 1kΩ load - confirmed in Section 6.5 Electrical Characteristics of the SLOS451D datasheet.
Does THS4631DDAR support single-supply operation?
Yes, THS4631DDAR supports single-supply operation from 10V to 30V, as specified in Section 6.3 Recommended Operating Conditions. Input common-mode range extends to within 2.5V of either rail, and output swings to within 1.5V of each rail under typical loads - enabling use in 24V industrial sensor interfaces or 15V data-acquisition systems without dual-rail supplies.
What is the purpose of the NC pins on THS4631DDAR?
THS4631DDAR has three no-connect (NC) pins: Pin 1, Pin 5, and Pin 8. These pins have no internal silicon connection and must remain unconnected in circuit design. TI's datasheet explicitly states they are "no internal connection" - tying them to ground or supply may cause parasitic coupling or violate SOIC-8 thermal pad isolation requirements.
How does THS4631DDAR achieve stability in transimpedance configurations?
THS4631DDAR achieves stability in transimpedance circuits via proper feedback capacitor (CF) selection, as derived in Equation 3 of the datasheet. CF counteracts the zero introduced by photodiode capacitance (CS), ensuring 20dB/decade noise-gain closure with open-loop gain. Typical CF values range from 2.2pF to 8.2pF depending on RF and CS - validated in Figure 6-2 through 6-4 and Table 8-1.
Is THS4631DDAR pin-compatible with other packages in the THS46xx family?
No - THS4631DDAR (SOIC-8) shares pinout with THS4631D but differs from THS4631DDA (HSOIC-8) and THS4631DGN (HVSSOP-8) in thermal pad configuration and mechanical dimensions. While electrical pin functions match across packages, PCB layout must be redesigned for DDA/DGN due to different pad geometry and thermal pad requirements - confirmed in Package Information section and Figure 5-1.
THS4631DDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-SO PowerPad
THS4631DDAR FAQ
1.How can I place an order for THS4631DDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4631DDAR 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 THS4631DDAR reliable?
The price and inventory of THS4631DDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4631DDAR is usually 5 days.
3.What payment methods are accepted for THS4631DDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4631DDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4631DDAR?
THS4631DDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4631DDAR 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 THS4631DDAR?
For technical support, including THS4631DDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4631DDAR requirements.
6.How does Aetrix verify that THS4631DDAR is sourced from the original manufacturer or authorized distributors?
All THS4631DDAR 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 THS4631DDAR meets industry standards.
7.What is the process for return or replacement of THS4631DDAR?
All THS4631DDAR units undergo pre-shipment inspection (PSI). If there is an issue with THS4631DDAR, 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 THS4631DDAR part is unused and in its original packaging.
Return procedure for THS4631DDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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