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Texas Instruments THS4631DGNRG4
- Part No.:
- THS4631DGNRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
THS4631DGNRG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,568
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Product details
Overview
THS4631DGNRG4 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, 1000V/µs slew rate (G = 5), ±15V supply operation, 7nV/√Hz input voltage noise, and 100pA maximum input bias current - enabling low-noise amplification of weak, high-impedance current sources in optical sensing systems.
For engineers reviewing the THS4631DGNRG4 datasheet, THS4631DGNRG4 pinout, THS4631DGNRG4 application, or THS4631DGNRG4 equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for high-speed, high-voltage op amp selection in photodiode, test & measurement, and active filtering designs.
Technical Context
The THS4631DGNRG4 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 stability 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 large-signal conditions.
Designed for ±5V to ±15V dual-supply operation, it maintains rail-to-rail output swing (±13.5V into 1kΩ) and high output drive capability (±95mA), while featuring low offset drift (2.5µV/°C) and robust ESD protection (±1500V CDM). Thermal performance is enhanced by the HVSSOP PowerPAD™ package's low RθJB (27.1°C/W).
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 0.1% settling for 2V step, critical for pulse fidelity in photodiode readout |
| Input Voltage Noise | 7nV/√Hz - preserves SNR when amplifying µA-level photodiode currents without dominating system noise floor |
| Input Bias Current | ≤100pA - minimizes DC error and leakage-induced drift in high-Z transimpedance feedback networks |
| Supply Range | ±5V to ±15V - allows ±13.5V output swing into 1kΩ, supporting wide dynamic range in optical front-ends |
| Small-Signal Bandwidth (G = 1) | 325MHz - ensures flat frequency response for RF/IF signal conditioning and active filter passbands |
| Harmonic Distortion (5MHz) | –76dBc (2nd), –94dBc (3rd) at 1kΩ load - maintains spectral purity in test equipment and DAC buffering |
Pinout & Package
The THS4631DGNRG4 is housed in an 8-pin HVSSOP (DGN) package with exposed thermal pad (PowerPAD™), measuring 3mm × 4.9mm. This thermally enhanced, surface-mount package enables efficient heat dissipation (RθJB = 27.1°C/W) in compact, high-density layouts typical of optical modules and portable test gear.
| 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; sensitive to parasitic capacitance |
| 3 | VIN+ | Noninverting input - referenced to ground or bias voltage; high-impedance node requiring guard ring |
| 4 | VS– | Negative power supply - connects to –15V rail; requires local 0.1µF + 10µF decoupling |
| 6 | VOUT– | Amplifier output - drives 100Ω–1kΩ loads; benefits from series resistor for capacitive load isolation |
| 7 | VS+ | Positive power supply - connects to +15V rail; shares decoupling network with VS– |
| Thermal Pad | Thermal plane | Electrically isolated copper pad; must be soldered to PCB ground plane for thermal and EMI control |
Key Features
| Feature | Design Value |
|---|---|
| FET-input topology | 10⁹ Ω || 3.9pF input impedance enables accurate transimpedance conversion of pA–nA photodiode currents |
| High slew rate + GBW synergy | 1000V/µs slew rate with 210MHz GBW permits simultaneous high gain, wide bandwidth, and large signal swing |
| Low-noise precision | 7nV/√Hz voltage noise + ≤100pA bias current achieves optimal SNR in low-level optical signal chains |
| Wide supply flexibility | Operates from ±5V to ±15V, supporting both low-power portable instruments and high-dynamic-range lab equipment |
| PowerPAD™ thermal design | HVSSOP package with exposed thermal pad reduces junction-to-board resistance to 27.1°C/W for sustained 95mA output |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
Use Scenario: Amplifying fast, low-current output from avalanche photodiodes (APDs) in fiber-optic receivers or LIDAR front-ends. IC Role / Device Role / Timing Role: Primary transimpedance amplifier converting photodiode current to voltage with minimal phase delay and overshoot. Use Value: 325MHz unity-gain bandwidth and 1000V/µs slew rate preserve nanosecond-scale pulse edges; 100pA bias current avoids signal corruption in high-RF configurations. |
Use Scenario: Converting DAC output current to precise voltage in high-speed arbitrary waveform generators. IC Role / Device Role / Timing Role: Output buffer and gain stage ensuring monotonicity, low glitch energy, and sub-40ns settling after full-scale transitions. Use Value: ±95mA output drive sustains 10Vpp into 100Ω loads; 2.5µV/°C offset drift maintains DC accuracy across instrument temperature ranges. |
| Test and Measurement Systems | Active Filtering |
Use Scenario: Signal conditioning path in oscilloscope front-ends or spectrum analyzer IF sections requiring wide dynamic range. IC Role / Device Role / Timing Role: High-fidelity gain block with low distortion and high PSRR (>95dB) rejecting power supply noise in sensitive analog paths. Use Value: –76dBc 2nd-harmonic distortion at 5MHz and 85–95dB PSRR ensure clean signal integrity during high-frequency probing and analysis. |
Use Scenario: Implementing 4th-order Butterworth or Chebyshev filters in medical imaging or communications baseband processing. IC Role / Device Role / Timing Role: Unity-gain stable voltage-feedback op amp serving as integrator or gain stage in multi-pole active filter topologies. Use Value: 325MHz small-signal bandwidth supports filter cutoff frequencies up to 100MHz; low input capacitance minimizes Q-factor degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-voltage op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4601DR | Lower GBW (180MHz), lower slew rate (100V/µs), same DGN package and ±15V supply | Not suitable for >50MHz transimpedance or fast pulse applications requiring <100ns settling | Select THS4601DR only when cost sensitivity outweighs bandwidth/slew requirements and 100pA bias current is acceptable |
| OPA657U | Higher GBW (1600MHz), higher slew rate (700V/µs), but narrower supply (±5V max) and higher voltage noise (4.8nV/√Hz) | Requires level-shifting for ±15V systems; less suitable for high-voltage photodiode biasing or wide-swing DAC buffering | Choose OPA657U for ultra-wideband, low-voltage signal chains where 7nV/√Hz noise and ±15V operation are not required |
Compared with THS4631DGNRG4, THS4601DR trades bandwidth and slew for cost and power efficiency, while OPA657U offers extreme speed at the expense of supply voltage headroom and noise performance - making THS4631DGNRG4 the balanced choice for ±15V, low-noise, wideband transimpedance applications.
Availability
THS4631DGNRG4 is available at Aetrix Electronics and suitable for optical sensing, automated test equipment, and high-speed data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for THS4631DGNRG4 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 innovation in high-performance op amps and precision signal chain solutions.
The THS4631DGNRG4 belongs to TI's high-speed FET-input op amp product line, engineered specifically for wideband transimpedance amplification, photodiode interfacing, and high-fidelity signal conditioning in demanding optical and instrumentation applications.
FAQ
What is the maximum operating supply voltage for the THS4631DGNRG4?
The THS4631DGNRG4 supports dual-supply operation from ±5V to ±15V, with absolute maximum ratings of ±16.5V. Operation beyond ±15V risks exceeding junction temperature limits and degrading long-term reliability. The THS4631DGNRG4 delivers optimal performance - including ±13.5V output swing into 1kΩ and 1000V/µs slew rate - within the recommended ±15V range.
Does the THS4631DGNRG4 require external compensation for stability in transimpedance configurations?
Yes, the THS4631DGNRG4 requires careful feedback capacitor (CF) selection to stabilize transimpedance circuits. Stability depends on source capacitance (CS) and feedback resistor (RF). Equation CF = 1/(2π·RF·GBP) provides a starting point, but final CF must be tuned empirically to suppress peaking and ensure flat bandwidth - especially critical given the THS4631DGNRG4's 210MHz GBP and high-speed response.
How does the THS4631DGNRG4 compare to standard bipolar-input op amps in photodiode applications?
The THS4631DGNRG4's FET input delivers ≤100pA bias current - over 1000× lower than typical bipolar-input op amps - eliminating significant DC error and drift in high-RF transimpedance stages. Its 10⁹ Ω || 3.9pF input impedance also preserves signal integrity from high-impedance photodiodes, whereas bipolar inputs load the source and degrade bandwidth. The THS4631DGNRG4 thus enables higher gain, wider bandwidth, and better SNR in optical front-ends.
Can the THS4631DGNRG4 drive heavy capacitive loads directly?
No - the THS4631DGNRG4 is not unity-gain stable into purely capacitive loads and exhibits ringing or oscillation when driving >10pF without isolation. For loads >50pF (e.g., coaxial cables or ADC inputs), a 10–50Ω series resistor between VOUT– and the load is mandatory. Layout best practices - including short traces, ground guard rings, and proper PowerPAD™ soldering - are essential to maintain stability and bandwidth in the THS4631DGNRG4.
Is the thermal pad of the THS4631DGNRG4 electrically connected to any internal node?
No - the thermal pad on the THS4631DGNRG4 is electrically isolated from all internal circuitry. It serves solely for thermal conduction and must be soldered to a PCB copper pour tied to system ground. This connection improves thermal resistance (RθJB = 27.1°C/W), reduces junction temperature under 95mA output current, and enhances EMI immunity - but introduces no electrical coupling or signal path risk in the THS4631DGNRG4.
THS4631DGNRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-HVSSOP
THS4631DGNRG4 FAQ
1.How can I place an order for THS4631DGNRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4631DGNRG4 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 THS4631DGNRG4 reliable?
The price and inventory of THS4631DGNRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4631DGNRG4 is usually 5 days.
3.What payment methods are accepted for THS4631DGNRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4631DGNRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4631DGNRG4?
THS4631DGNRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4631DGNRG4 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 THS4631DGNRG4?
For technical support, including THS4631DGNRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4631DGNRG4 requirements.
6.How does Aetrix verify that THS4631DGNRG4 is sourced from the original manufacturer or authorized distributors?
All THS4631DGNRG4 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 THS4631DGNRG4 meets industry standards.
7.What is the process for return or replacement of THS4631DGNRG4?
All THS4631DGNRG4 units undergo pre-shipment inspection (PSI). If there is an issue with THS4631DGNRG4, 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 THS4631DGNRG4 part is unused and in its original packaging.
Return procedure for THS4631DGNRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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