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Texas Instruments THS4631DGN
- Part No.:
- THS4631DGN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
THS4631DGN.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,358
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Product details
Overview
THS4631DGN from Texas Instruments is a high-voltage, FET-input operational amplifier optimized for wideband transimpedance gain stages, photodiode amplification, and high-slew-rate 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-dynamic-range amplification of weak current signals in optical sensing and test equipment.
For engineers reviewing the THS4631DGN datasheet, THS4631DGN pinout, THS4631DGN application, or THS4631DGN equivalent, this page provides verified specifications, HVSSOP-8 package details, real-world photodiode and DAC buffer use cases, thermal performance data, and two validated alternative op-amps with documented functional trade-offs.
Technical Context
The THS4631DGN 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 internal compensation supports stable operation with capacitive loads up to 100pF when isolated via RISO, and its ±15V supply range enables ±13.5V output swing into 1kΩ.
Designed for transimpedance applications, it features low 2.5µV/°C offset drift and −76dB SFDR at 5MHz, allowing accurate amplification of low-level photodiode currents while maintaining signal integrity across temperature and frequency. The device's 95mA output drive capability supports direct driving of moderate-impedance loads without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 210MHz - enables stable transimpedance gain ≥20 with >10MHz flat bandwidth using typical photodiode source capacitances. |
| Slew Rate (G = 5) | 1000V/µs - ensures sub-100ns settling for 10V step outputs, critical for fast pulse detection in LIDAR and time-of-flight systems. |
| Input Voltage Noise | 7nV/√Hz - lower than comparable high-speed FET op-amps, preserving SNR when amplifying µA-level photodiode currents. |
| Input Bias Current | ≤100pA - minimizes DC error in high-impedance transimpedance circuits, reducing offset drift caused by feedback resistor leakage. |
| Supply Range | ±5V to ±15V - supports rail-to-rail output swing up to ±13.5V into 1kΩ, accommodating wide dynamic range in industrial analog front-ends. |
| Output Current | ±95mA - drives 100Ω loads directly, eliminating need for external output buffers in high-speed DAC output stages. |
| Common-Mode Rejection | 95dB (typ) - maintains accuracy in single-ended configurations with noisy power supplies or ground shifts. |
Pinout & Package
The THS4631DGN is housed in an 8-pin HVSSOP (DGN) package measuring 3mm × 4.9mm with exposed thermal pad. This thermally enhanced package achieves 54.6°C/W junction-to-ambient resistance and requires connection of the thermal pad to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | No-connect (NC) | Internally unconnected; must be left floating or tied to ground per layout guidelines - no routing required. |
| 2 | Inverting Input (VIN–) | Primary node for transimpedance feedback; low input capacitance (3.9pF) minimizes peaking with photodiode junction capacitance. |
| 3 | Noninverting Input (VIN+) | High-impedance reference node; typically grounded or biased to mid-supply for single-ended operation. |
| 4 | Negative Supply (VS–) | Connects to −15V (or −5V); decoupling capacitor (≥0.1µF) required within 5mm for stability at high frequencies. |
| 6 | Output (VOUT–) | Amplifier output capable of ±13.5V swing into 1kΩ; layout must minimize trace inductance to preserve 1000V/µs slew rate. |
| 7 | Positive Supply (VS+) | Connects to +15V (or +5V); paired decoupling with VS– ensures PSRR >95dB up to 100kHz. |
| Thermal Pad | Thermal Interface | Electrically isolated copper pad; must be soldered to solid ground plane for thermal dissipation - not connected to any signal net. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input topology | Enables ≤100pA input bias current and 10⁹Ω input impedance - essential for minimizing DC error in high-RF transimpedance designs. |
| 1000V/µs slew rate at G = 5 | Supports <100ns settling for full-scale 10V pulses, meeting timing requirements in high-speed data acquisition and pulsed laser receivers. |
| −76dB SFDR at 5MHz | Ensures clean amplification of small-signal photodiode outputs without harmonic contamination in spectral analysis applications. |
| ±15V supply capability | Permits ±13.5V output swing into 1kΩ, increasing dynamic range by >12dB versus ±5V op-amps - critical for ADC input buffering. |
| Thermally enhanced HVSSOP | 54.6°C/W RθJA with thermal pad grounded - allows continuous 12.5mA quiescent current operation at 85°C ambient without derating. |
Applications
| Wideband Photodiode Amplifier | High-Speed DAC Output Buffer |
|---|---|
|
Use Scenario: Amplifying nanoampere-level photocurrent from avalanche photodiodes in fiber-optic receivers or LIDAR front-ends. IC Role / Device Role / Timing Role: Transimpedance gain stage converting photodiode current to voltage with minimal added noise and phase distortion. Use Value: 7nV/√Hz input voltage noise and 100pA bias current preserve signal-to-noise ratio for weak optical signals; 210MHz GBWP supports >50MHz modulation bandwidth. |
Use Scenario: Driving 50Ω coaxial cables or ADC inputs from high-speed current-steering DACs in arbitrary waveform generators. IC Role / Device Role / Timing Role: High-slew-rate output buffer isolating DAC core from reactive loads while maintaining fast edge fidelity. Use Value: 1000V/µs slew rate ensures <1ns edge degradation on 10V transitions; ±95mA output current drives 50Ω loads directly without external stages. |
| Test & Measurement Signal Conditioning | Active Wideband Filtering |
|
Use Scenario: Front-end amplification in oscilloscope channels or spectrum analyzer preselectors requiring wide dynamic range and low distortion. IC Role / Device Role / Timing Role: First-stage gain block providing high-Z input, low-noise amplification, and rail-to-rail output swing before digitization. Use Value: 95dB CMRR and 95dB PSRR suppress common-mode interference from switching power supplies; ±13.5V output swing maximizes ADC utilization. |
Use Scenario: Implementing 2nd-order active low-pass or band-pass filters in RF instrumentation with cutoff frequencies up to 100MHz. IC Role / Device Role / Timing Role: Unity-gain-stable voltage-feedback amplifier serving as integrator or gain element in filter topologies. Use Value: 325MHz unity-gain bandwidth ensures filter response remains flat to 100MHz; low 2.5µV/°C drift maintains passband accuracy over temperature. |
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 1600MHz GBWP but narrower ±5V supply range; 4.8nV/√Hz noise, 700V/µs slew rate. | Better suited for ultra-wideband AC-coupled applications below 10V output swing; unsuitable for ±12V systems. | Select OPA657 only when bandwidth >500MHz is required and supply rails are limited to ±5V. |
| THS4601 | Lower 180MHz GBWP, 100V/µs slew rate, same ±15V supply and HVSSOP-8 package. | Cost-optimized alternative for transimpedance applications where 10MHz bandwidth suffices and slew rate is non-critical. | Choose THS4601 when system timing budget allows >100ns settling and photodiode bandwidth is <5MHz. |
Compared with THS4631DGN, OPA657 trades supply flexibility and output drive for extreme bandwidth, while THS4601 reduces cost and power at the expense of slew rate and noise performance - making THS4631DGN the balanced choice for ±15V, >50MHz, low-noise transimpedance systems.
Availability
THS4631DGN is available at Aetrix Electronics and suitable for wideband photodiode amplifiers, high-speed DAC output buffering, and test-and-measurement signal conditioning requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for THS4631DGN 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 THS4631DGN belongs to TI's high-voltage, high-speed FET-input op-amp product line, engineered specifically for transimpedance amplification, optical sensing, and wideband analog front-ends demanding low noise, high slew rate, and rail-to-rail output swing.
FAQ
What is the maximum recommended supply voltage for THS4631DGN?
The absolute maximum supply voltage for THS4631DGN is ±16.5V, but the recommended operating range is ±5V to ±15V. Operation at ±15V enables full specification compliance including ±13.5V output swing into 1kΩ and 1000V/µs slew rate at G = 5. Exceeding ±15V risks accelerated parametric shift and reduced long-term reliability, even if within absolute ratings.
Does THS4631DGN require external compensation for stability in transimpedance configurations?
Yes - THS4631DGN requires external feedback capacitance (CF) to stabilize transimpedance circuits. For a given photodiode capacitance (CS) and feedback resistor (RF), CF is calculated as 1/(2π × RF × GBP) to maximize flat bandwidth. Typical values range from 0.5pF to 8.2pF depending on CS; layout parasitics must be accounted for during final tuning.
Can THS4631DGN drive a 50Ω load directly?
Yes - THS4631DGN delivers ±95mA output current, enabling direct driving of 50Ω loads with ±4.75V swing. However, for full 10Vpp output, a series 45Ω resistor is recommended to match 50Ω impedance and prevent reflections. The device's 0.1Ω closed-loop output impedance at DC ensures minimal gain error under load.
What is the thermal pad connection requirement for THS4631DGN?
The thermal pad on THS4631DGN must be soldered to a dedicated PCB ground plane with ≥4 thermal vias (0.3mm diameter) connecting to inner ground layers. This configuration achieves the specified 54.6°C/W RθJA. Leaving the pad unconnected raises junction temperature by >30°C at 12.5mA IQ, risking thermal shutdown or accelerated parameter drift.
How does THS4631DGN compare to THS4631D in SOIC-8 package?
THS4631DGN (HVSSOP-8) and THS4631D (SOIC-8) share identical electrical specifications but differ thermally and mechanically. THS4631DGN offers 54.6°C/W RθJA versus 120.8°C/W for THS4631D, enabling 2.2× higher power dissipation at the same ambient temperature. The smaller 3mm × 4.9mm footprint also saves board space in dense layouts.
THS4631DGN 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:
- 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:
- 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-HVSSOP
THS4631DGN FAQ
1.How can I place an order for THS4631DGN through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4631DGN 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 THS4631DGN reliable?
The price and inventory of THS4631DGN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4631DGN is usually 5 days.
3.What payment methods are accepted for THS4631DGN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4631DGN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4631DGN?
THS4631DGN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4631DGN 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 THS4631DGN?
For technical support, including THS4631DGN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4631DGN requirements.
6.How does Aetrix verify that THS4631DGN is sourced from the original manufacturer or authorized distributors?
All THS4631DGN 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 THS4631DGN meets industry standards.
7.What is the process for return or replacement of THS4631DGN?
All THS4631DGN units undergo pre-shipment inspection (PSI). If there is an issue with THS4631DGN, 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 THS4631DGN part is unused and in its original packaging.
Return procedure for THS4631DGN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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