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Texas Instruments THS4631DGNG4
- Part No.:
- THS4631DGNG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
THS4631DGNG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,382
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Product details
Overview
THS4631DGNG4 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 210 MHz gain-bandwidth product, ±15 V supply operation, 1000 V/µs slew rate (G = 5), 7 nV/√Hz input voltage noise, and 100 pA max input bias current - enabling low-noise, high-swing amplification of weak, high-impedance current sources in test equipment and optical sensing systems.
For engineers reviewing the THS4631DGNG4 datasheet, THS4631DGNG4 pinout, THS4631DGNG4 application, or THS4631DGNG4 equivalent, this page provides verified technical context, package-specific pin functions, real-world design implications of key specs, and two validated alternative op amps with documented functional trade-offs for transimpedance and high-speed buffer use cases.
Technical Context
The THS4631DGNG4 employs a voltage-feedback architecture with JFET input stage, delivering unity-gain stability and simultaneous high bandwidth (325 MHz at G = 1) and high output drive (±11 V into 100 Ω). Its 10⁹ Ω || 3.9 pF input impedance minimizes loading on capacitive sources like photodiodes, while its 2.5 µV/°C offset drift and ±500 µV max input offset voltage support precision DC-coupled gain stages.
Thermal performance is enhanced by the HVSSOP-8 (DGN) package's integrated PowerPAD™, achieving RθJB = 27.1 °C/W - critical for maintaining stability under sustained 95 mA output current and high-power dissipation in compact layouts. The device operates across −40°C to +85°C with ±5 V to ±15 V dual-supply flexibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 210 MHz - enables stable transimpedance gain ≥20 with >10 MHz flat bandwidth using typical photodiode source capacitances. |
| Slew Rate (G = 5) | 1000 V/µs - supports <40 ns 0.1% settling for 2 V step, essential for fast pulse response in time-domain optical measurements. |
| Input Voltage Noise | 7 nV/√Hz - lower than most 1 GHz-class op amps, preserving SNR when amplifying sub-µA photodiode currents. |
| Input Bias Current | Max 100 pA - ensures minimal error in high-RF transimpedance designs (e.g., 100 kΩ–10 MΩ), critical for low-light detection. |
| Supply Range | ±5 V to ±15 V - allows ±13.5 V output swing into 1 kΩ, supporting wide dynamic range without clipping in analog front-ends. |
| Output Current | ±95 mA - drives low-impedance loads (e.g., 50 Ω cables, ADC inputs) directly, eliminating need for external buffers. |
| Harmonic Distortion (5 MHz) | −76 dBc (2nd), −94 dBc (3rd) at 2 VPP, 1 kΩ - enables clean signal reconstruction in high-fidelity test instrumentation. |
Pinout & Package
The THS4631DGNG4 is housed in an 8-pin HVSSOP (DGN) package with exposed thermal pad (PowerPAD™), measuring 3 mm × 4.9 mm. The pad is electrically isolated and must be soldered to a PCB ground plane for optimal thermal performance (RθJB = 27.1 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | No internal connection (NC) | Must remain unconnected; no routing or copper pour required - avoids parasitic coupling in high-frequency layouts. |
| 2 | Inverting input (VIN−) | Primary node for transimpedance feedback; low input capacitance (3.9 pF) reduces peaking with photodiode junction capacitance. |
| 3 | Noninverting input (VIN+) | High-impedance reference point; typically grounded or biased via high-value resistors to minimize input current error. |
| 4 | Negative supply (VS−) | Connects to −VS; requires local 0.1 µF ceramic bypass capacitor placed ≤2 mm from pin to suppress high-frequency PSRR degradation. |
| 6 | Output (VOUT−) | Delivers full-swing output; layout must minimize trace inductance when driving capacitive loads >100 pF to prevent oscillation. |
| 7 | Positive supply (VS+) | Connects to +VS; same bypassing requirement as VS−; symmetry critical for PSRR >95 dB up to 1 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input topology | Enables 10⁹ Ω input resistance and 100 pA max bias current - preserves signal integrity in high-Z sensor interfaces (e.g., photodiodes, piezoelectrics). |
| Unity-gain stable | Eliminates need for external compensation in G ≥ 1 configurations, simplifying layout for wideband buffers and active filters. |
| PowerPAD™ thermal enhancement | Reduces junction-to-board thermal resistance to 27.1 °C/W - sustains 95 mA output current at 85°C ambient without derating. |
| Low 0.1 dB bandwidth flatness | 20 MHz flatness at G = 2 ensures amplitude accuracy across multi-MHz signal bands in oscilloscope front-ends and spectrum analyzers. |
| High PSRR & CMRR | 95 dB PSRR and 95 dB CMRR at DC - rejects power rail noise and common-mode interference in mixed-signal test systems. |
Applications
| Wideband Photodiode Amplifier | High-Speed Transimpedance Gain Stage |
|---|---|
|
Use Scenario: Amplifying nanoampere-level photocurrent from fiber-optic receiver diodes operating at 10–100 MHz modulation rates. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode current to voltage with minimal added noise and phase distortion. Use Value: 7 nV/√Hz input noise and 1000 V/µs slew rate enable >70 dB SNR at 5 MHz while preserving pulse fidelity for 100 Mbps optical data recovery. |
Use Scenario: Converting DAC output current (e.g., from high-speed current-steering DACs) into single-ended voltage for ADC sampling. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with fast settling to support >50 MSPS sampling rates. Use Value: 40 ns 0.1% settling time and ±13.5 V output swing into 1 kΩ ensure accurate digitization of wide-dynamic-range analog waveforms. |
| Test & Measurement Systems | Active Filtering |
|
Use Scenario: Front-end gain block in portable oscilloscopes and signal analyzers requiring >100 MHz analog bandwidth and low harmonic distortion. IC Role / Device Role / Timing Role: High-fidelity buffer and gain stage preserving signal integrity from probe tip to ADC input. Use Value: −76 dBc 2nd-harmonic distortion at 5 MHz and 210 MHz GBWP allow clean acquisition of multi-tone test signals without spectral masking. |
Use Scenario: Implementing 4th-order Bessel or Chebyshev filters in medical ultrasound receivers and radar IF chains. IC Role / Device Role / Timing Role: Active filter section providing precise pole placement and gain control with minimal group delay variation. Use Value: Unity-gain stability and 325 MHz small-signal bandwidth support filter corner frequencies up to 50 MHz with <0.1 dB passband ripple. |
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 1.6 GHz GBWP but lower 700 V/µs slew rate; 4.8 nV/√Hz noise; ±5 V only supply. | Better for ultra-wideband AC-coupled RF gain; unsuitable for ±15 V or high-output-swing DC-coupled transimpedance. | Choose OPA657IDBVR when bandwidth >500 MHz is mandatory and supply headroom is limited to ±5 V. |
| THS4601IDGNR | Lower 180 MHz GBWP and 100 V/µs slew rate; same DGN package; 5.4 nV/√Hz noise; 100 pA bias current. | Cost-optimized for <50 MHz transimpedance; insufficient slew for fast-pulse applications requiring <100 ns settling. | Choose THS4601IDGNR for lower-cost, lower-bandwidth photodiode amps where 100 MHz bandwidth suffices. |
Compared with OPA657IDBVR and THS4601IDGNR, the THS4631DGNG4 uniquely balances 210 MHz GBWP, 1000 V/µs slew rate, ±15 V operation, and 7 nV/√Hz noise - making it the only option among the three capable of high-swing, high-precision transimpedance amplification across −40°C to +85°C industrial environments.
Availability
THS4631DGNG4 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 consistent parametric performance across temperature.
Supply support for THS4631DGNG4 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 high-performance op amps and precision signal-chain solutions.
The THS4631DGNG4 belongs to TI's high-voltage, high-speed FET-input op amp product line, engineered specifically for transimpedance amplification, optical sensing, and wideband instrumentation where low noise, high slew rate, and rail-to-rail output swing are critical.
FAQ
What is the maximum supply voltage rating for THS4631DGNG4?
The THS4631DGNG4 has an absolute maximum supply voltage of ±16.5 V, with recommended operating range of ±5 V to ±15 V. Operation beyond ±15 V risks exceeding junction temperature limits and degrading long-term reliability - always observe derating curves in Section 6.1 of the datasheet. The THS4631DGNG4 is rated for continuous operation at ±15 V across −40°C to +85°C.
Does THS4631DGNG4 require external compensation for unity-gain stability?
No, the THS4631DGNG4 is internally compensated for unity-gain stability. It achieves stable operation with closed-loop gains ≥1 without external capacitors, simplifying design of wideband buffers and transimpedance amplifiers. However, feedback capacitor (CF) selection remains critical in photodiode applications to counteract source capacitance-induced peaking - refer to Equation 3 in Section 8.2.1.1.1 of the THS4631DGNG4 datasheet.
What is the thermal pad connection requirement for THS4631DGNG4?
The THS4631DGNG4's exposed thermal pad (PowerPAD™) is electrically isolated and must be soldered to a solid PCB ground plane to achieve specified RθJB = 27.1 °C/W. Use ≥6 thermal vias (0.3 mm diameter) connecting the pad to inner ground layers. Failure to connect the pad results in >2× higher junction temperature rise under 95 mA load, risking thermal shutdown or accelerated parameter drift.
Can THS4631DGNG4 drive a 50 Ω coaxial cable directly?
Yes, the THS4631DGNG4 delivers ±11 V output swing into 100 Ω and can source/sink ±95 mA, enabling direct 50 Ω cable driving with appropriate series termination. For best signal integrity, place a 49.9 Ω series resistor at the output pin and route the cable differentially if possible. Avoid unterminated 50 Ω loads above 20 MHz due to potential ringing from output impedance mismatch - verify stability with network analyzer S-parameter measurements.
How does input bias current affect transimpedance accuracy in THS4631DGNG4?
The THS4631DGNG4's max 100 pA input bias current introduces ≤10 µV error across a 100 kΩ feedback resistor - negligible compared to its ±500 µV input offset voltage. In high-gain transimpedance designs (e.g., 10 MΩ RF), bias current contributes ≤1 mV error, which remains within typical calibration tolerances. For sub-picoampere precision, use guard traces and low-leakage PCB materials - the THS4631DGNG4's JFET input inherently minimizes this error source relative to bipolar-input alternatives.
THS4631DGNG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- 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-HVSSOP
THS4631DGNG4 FAQ
1.How can I place an order for THS4631DGNG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4631DGNG4 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 THS4631DGNG4 reliable?
The price and inventory of THS4631DGNG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4631DGNG4 is usually 5 days.
3.What payment methods are accepted for THS4631DGNG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4631DGNG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4631DGNG4?
THS4631DGNG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4631DGNG4 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 THS4631DGNG4?
For technical support, including THS4631DGNG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4631DGNG4 requirements.
6.How does Aetrix verify that THS4631DGNG4 is sourced from the original manufacturer or authorized distributors?
All THS4631DGNG4 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 THS4631DGNG4 meets industry standards.
7.What is the process for return or replacement of THS4631DGNG4?
All THS4631DGNG4 units undergo pre-shipment inspection (PSI). If there is an issue with THS4631DGNG4, 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 THS4631DGNG4 part is unused and in its original packaging.
Return procedure for THS4631DGNG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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