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Texas Instruments THS4631DG4
- Part No.:
- THS4631DG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4631DG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,917
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Product details
Overview
THS4631DG4 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 amplification of weak, high-impedance current sources in optical sensing systems.
For engineers reviewing the THS4631DG4 datasheet, THS4631DG4 pinout, THS4631DG4 application, or THS4631DG4 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 equipment, and active filtering designs.
Technical Context
The THS4631DG4 employs a voltage-feedback architecture with JFET input stage, supporting unity-gain stability and wide common-mode input range (–13V to +12V) under ±15V supplies. Its 210MHz gain bandwidth product and 1000V/µs slew rate enable fast settling (<40ns to 0.1%) and low harmonic distortion (–76dB SFDR at 5MHz) in high-frequency closed-loop configurations.
Thermal design is enabled by SOIC-8 package with RθJA = 120.8°C/W and integrated thermal pad isolation in DDA/DGN variants; the DG4 suffix confirms SOIC-8 (D package) with 4.9mm × 6mm footprint and no internal thermal pad connection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 210MHz - enables stable transimpedance gains up to G = 20 while preserving >10MHz flat bandwidth with typical photodiode source capacitance. |
| Slew Rate (G = 5) | 1000V/µs - supports full-scale 10V output steps in <10ns, critical for pulse fidelity in time-of-flight and laser receiver circuits. |
| Input Voltage Noise | 7nV/√Hz - lower than comparable high-slew-rate op amps, minimizing added noise when amplifying picoamp-level photodiode currents. |
| Input Bias Current | ±100pA max - ensures minimal DC error in high-impedance transimpedance feedback networks (e.g., RF ≥ 1MΩ). |
| Supply Range | ±5V to ±15V - allows direct interfacing with legacy ±12V or industrial ±15V rails without level-shifting, supporting ±13.5V output swing into 1kΩ. |
| Harmonic Distortion | –76dB SFDR at 5MHz - maintains signal integrity in wideband test equipment front-ends and active filter passbands. |
| Common-Mode Rejection | 95dB typ - rejects power-supply ripple and board-level noise in single-ended sensor interfaces with unbalanced layout. |
Pinout & Package
THS4631DG4 is packaged in an 8-pin SOIC (D package), 4.9mm × 6mm body size, with no exposed thermal pad. Pin 1 is NC (no internal connection); pins 2 and 3 are inverting and noninverting inputs; pin 4 is VS–; pin 6 is VOUT; pin 7 is VS+; pins 1, 5, and 8 are NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No internal connection | Must be left floating or tied to ground per layout best practice; no electrical function. |
| Pin 2 (VIN–) | Inverting input | Primary node for transimpedance feedback network; low input capacitance (3.9pF) minimizes peaking with photodiode junction capacitance. |
| Pin 3 (VIN+) | Noninverting input | High-impedance reference node; typically grounded or biased to mid-supply for single-ended operation. |
| Pin 4 (VS–) | Negative supply rail | Connects to –15V (or –5V); must be decoupled locally with ≥100nF ceramic capacitor near pin. |
| Pin 5 (NC) | No internal connection | Unused; avoid routing signals or traces adjacent to prevent coupling. |
| Pin 6 (VOUT) | Amplifier output | Capable of ±13.5V swing into 1kΩ; drives 95mA load; requires series resistor (≥10Ω) if driving >100pF capacitive loads. |
| Pin 7 (VS+) | Positive supply rail | Connects to +15V (or +5V); paired decoupling with VS– ensures PSRR >95dB at DC. |
| Pin 8 (NC) | No internal connection | Electrically isolated; PCB copper pour may extend under it for thermal mass, but no solder connection required. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input topology | Enables 10⁹Ω || 3.9pF input impedance - preserves signal integrity from high-Z sources like photodiodes and piezoelectric sensors without loading. |
| High slew rate + low noise coexistence | 1000V/µs slew rate with only 7nV/√Hz voltage noise - rare combination allowing fast large-signal response without sacrificing SNR in low-level detection. |
| Wide supply range support | Operates from ±5V to ±15V - eliminates need for external charge pumps or regulators in mixed-voltage systems, simplifying power architecture. |
| Low input offset drift | ±2.5µV/°C max - ensures stable DC operating point across industrial temperature range (–40°C to +85°C), reducing calibration frequency. |
| Unity-gain stable design | Guaranteed stable at G = 1 without external compensation - enables direct use in buffer, integrator, and gain-of-one photodiode configurations. |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
|
Use Scenario: Amplifying nanoampere-level photocurrent from fiber-optic receivers or LIDAR detectors operating up to 100MHz. IC Role / Device Role / Timing Role: Primary transimpedance gain element converting photodiode current to voltage with minimal phase shift and overshoot. Use Value: 210MHz GBWP and 1000V/µs slew rate enable >50MHz usable bandwidth with 10kΩ–1MΩ feedback resistors, supporting high-data-rate optical links. |
Use Scenario: Signal conditioning in automated test equipment (ATE) where fast-rising current pulses from DUTs require precise amplitude and timing capture. IC Role / Device Role / Timing Role: High-fidelity current-to-voltage converter in front-end acquisition path, preceding ADC sampling. Use Value: Low 7nV/√Hz noise and ±100pA bias current preserve dynamic range and DC accuracy during sub-10ns pulse measurement. |
| Test and Measurement Systems | Active Filtering |
|
Use Scenario: Input buffer and gain stage in oscilloscope vertical amplifiers or spectrum analyzer IF chains requiring wideband linearity. IC Role / Device Role / Timing Role: First-stage amplifier handling ±10V input signals with minimal distortion and group delay variation. Use Value: –76dB SFDR at 5MHz and 95dB CMRR ensure accurate amplitude representation of complex waveforms without harmonic contamination. |
Use Scenario: Implementing 4th-order Chebyshev or Bessel filters in medical imaging front-ends where phase linearity and transient response are critical. IC Role / Device Role / Timing Role: Active gain block in multiple-feedback (MFB) or state-variable filter topologies. Use Value: Unity-gain stability and 325MHz small-signal bandwidth allow filter corner frequencies up to 20MHz with predictable roll-off and minimal Q-sensitivity. |
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 GBWP but narrower ±5.5V supply range; 4.8nV/√Hz noise; 700V/µs slew rate. | Better for ultra-wideband RF sampling; less suitable for ±12V/±15V industrial systems or high-voltage output swing requirements. | Select OPA657IDBVR when bandwidth >500MHz is mandatory and supply rails are limited to ±5V. |
| THS4601CD | Lower 180MHz GBWP, 100V/µs slew rate, same ±15V supply and SOIC-8 package; higher 5.4nV/√Hz noise. | Cost-optimized for moderate-speed transimpedance applications where 100MHz bandwidth suffices and slew rate <200V/µs is acceptable. | Select THS4601CD when system bandwidth requirement is ≤100MHz and budget constraints outweigh need for highest slew rate. |
Compared with OPA657IDBVR and THS4601CD, THS4631DG4 uniquely balances 210MHz GBWP, 1000V/µs slew rate, ±15V operation, and 7nV/√Hz noise - making it the only option among the three capable of sustaining >50MHz transimpedance bandwidth with ±13V output swing and low distortion in industrial-grade optical receivers.
Availability
THS4631DG4 is available at Aetrix Electronics and suitable for wideband photodiode amplifiers, high-speed test equipment front-ends, and active filtering circuits requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.
Supply support for THS4631DG4 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 THS4631DG4 belongs to TI's high-voltage, high-speed FET-input op amp product line, engineered specifically for wideband transimpedance amplification, optical sensing, and test instrumentation demanding simultaneous high slew rate, low noise, and rail-to-rail output drive capability.
FAQ
What is the maximum recommended supply voltage for THS4631DG4?
The absolute maximum supply voltage for THS4631DG4 is ±16.5V, but the recommended operating range is ±5V to ±15V. Operation at ±15V enables full ±13.5V output swing into 1kΩ and optimal slew rate performance. Exceeding ±15V risks accelerated parametric drift and reduced long-term reliability, even if within absolute maximum ratings.
Does THS4631DG4 require external compensation for unity-gain stability?
No, THS4631DG4 is internally compensated for unity-gain stability. It remains stable with closed-loop gains ≥1 without external capacitors or feedback network adjustments. This allows direct use in photodiode transimpedance configurations with G = 1, though CF is still required to control bandwidth and suppress peaking caused by photodiode capacitance.
What is the input bias current specification for THS4631DG4 at 85°C?
The maximum input bias current for THS4631DG4 is ±2000pA at TA = –40°C to +85°C. At 25°C, it is specified as ±100pA max. The increase reflects JFET input stage behavior; designers must account for this drift when using high-value feedback resistors (>100kΩ) in wide-temperature-range applications.
Can THS4631DG4 drive a 50Ω load directly?
THS4631DG4 can source/sink up to ±95mA, enabling direct 50Ω drive with ±10V swing (at RL = 100Ω). For sustained 50Ω operation, derating is advised: output swing reduces to ±10V, and thermal considerations require careful PCB layout with copper pour. Use a series 25Ω resistor to isolate the op amp from reactive 50Ω loads and prevent instability.
How does the THS4631DG4 compare to THS4631D in pinout and functionality?
THS4631DG4 and THS4631D share identical pinout, electrical specifications, and SOIC-8 (D) package dimensions. The "G4" suffix denotes TI's green packaging standard (lead-free, RoHS-compliant), while "D" is the base orderable part number. Both are functionally and mechanically interchangeable in existing designs.
THS4631DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
THS4631DG4 FAQ
1.How can I place an order for THS4631DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4631DG4 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 THS4631DG4 reliable?
The price and inventory of THS4631DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4631DG4 is usually 5 days.
3.What payment methods are accepted for THS4631DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4631DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4631DG4?
THS4631DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4631DG4 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 THS4631DG4?
For technical support, including THS4631DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4631DG4 requirements.
6.How does Aetrix verify that THS4631DG4 is sourced from the original manufacturer or authorized distributors?
All THS4631DG4 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 THS4631DG4 meets industry standards.
7.What is the process for return or replacement of THS4631DG4?
All THS4631DG4 units undergo pre-shipment inspection (PSI). If there is an issue with THS4631DG4, 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 THS4631DG4 part is unused and in its original packaging.
Return procedure for THS4631DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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