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Texas Instruments THS4031CD
- Part No.:
- THS4031CD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4031CD.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:118
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Product details
Overview
THS4031CD from Texas Instruments is a single-channel, ultra-low-noise (1.2nV/√Hz), high-speed voltage-feedback operational amplifier optimized for precision signal conditioning in wideband, low-distortion applications. It delivers 100MHz bandwidth at G = 2, 100V/μs slew rate, –96dBc THD at 1MHz (RL = 1kΩ), and features offset nulling pins for fine-tuning. It is used as a high-fidelity buffer/driver for 16-bit SAR ADCs like the ADS8422 in data acquisition systems.
For engineers reviewing the THS4031CD datasheet, THS4031CD pinout, THS4031CD application, or THS4031CD equivalent, key selection criteria include input voltage noise density, small-signal bandwidth under gain ≥2, output drive capability into 150Ω/1kΩ loads, thermal performance in SOIC-8, and offset nulling implementation using pins 1 and 8.
Technical Context
The THS4031CD employs a 30V complementary bipolar process with GHz fT NPN/PNP transistors, enabling voltage-feedback architecture with unity-gain stability and 120MHz bandwidth. Its internal compensation prioritizes bandwidth and slew rate but requires external isolation resistors (>20Ω) when driving capacitive loads >10pF to maintain phase margin.
It operates from ±4.5V to ±16V dual supplies (or 9V–32V single supply), supports rail-to-rail output swing up to ±13.6V (RL = 1kΩ), and integrates dedicated offset null pins (1, 8) - a feature absent in the dual-channel THS4032 - enabling precise DC bias correction in high-gain sensor or DAQ front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage noise | 1.2nV/√Hz @ >10kHz - enables high-resolution signal amplification without degrading SNR in low-level sensor/ADC interfaces. |
| Small-signal BW | 100MHz @ G = 2 (–3dB) - supports full-power video, ultrasound, and VST baseband signal paths up to ~50MHz Nyquist. |
| Slew rate | 100V/μs @ ±15V - ensures faithful reproduction of fast transient signals (e.g., 20V step in <70ns) without slewing distortion. |
| THD | –96dBc @ 1MHz, RL = 1kΩ - meets stringent linearity requirements for 16-bit+ data acquisition and communications IF stages. |
| Input offset voltage | 0.3mV (typical), 3mV (max over temp) - allows direct coupling in medium-gain (≤100×) precision amplifiers without DC blocking. |
| Output current | 200mA (typical) - drives heavy loads including 150Ω video lines, active filters with low-Z feedback, and multiplexed ADC inputs. |
| Supply range | ±4.5V to ±16V - accommodates industrial ±5V/±12V rails and high-voltage test equipment while maintaining AC performance. |
Pinout & Package
THS4031CD is packaged in an 8-pin SOIC (D package), 4.9mm × 6mm body size, with exposed thermal pad only in HVSSOP variants (not applicable to CD suffix). Pin functions are validated per TI SLOS224L Rev L (July 2024).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 NULL | Offset adjust input | Connect external potentiometer wiper to VCC– to null input offset voltage - critical for DC-coupled high-gain stages. |
| 2 IN– | Inverting input | Differential input node; high-impedance (2MΩ) with 1.5pF capacitance - requires careful layout to minimize parasitic coupling. |
| 3 IN+ | Noninverting input | Differential input node; matched to IN– for optimal CMRR (95dB typ) and common-mode rejection in noisy environments. |
| 4 VCC– | Negative supply rail | Return path for bias and output current; must be low-impedance with local 0.1μF bypass to ground. |
| 5 NC | No connection | Internally unconnected; leave floating - no routing or grounding required. |
| 6 OUT | Amplifier output | Capable of ±13.6V swing into 1kΩ; requires series resistor ≥20Ω when driving >10pF capacitive loads to prevent oscillation. |
| 7 VCC+ | Positive supply rail | Primary power input; must be decoupled with 0.1μF ceramic capacitor close to pin to suppress high-frequency supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low voltage noise | 1.2nV/√Hz enables sub-16-bit ENOB preservation in front-end buffers for high-resolution ADCs. |
| Offset nulling capability | Pins 1 and 8 allow <10μV residual offset tuning - essential for precision instrumentation and zero-drift sensor interfaces. |
| High output drive | 200mA continuous sourcing/sinking supports direct driving of 75Ω video lines and low-impedance active filters without external buffers. |
| Unity-gain stable | 120MHz bandwidth at G = 1 permits use in voltage followers and wideband gain-of-one applications without external compensation. |
| Low THD into high-Z load | –96dBc @ 1MHz, RL = 1kΩ ensures minimal harmonic contamination in IF/RF sampling chains and audio reconstruction filters. |
Applications
| High-Performance Data Acquisition | Ultrasound Signal Conditioning |
|---|---|
Use Scenario: Buffering analog outputs from multiplexed sensor arrays into 16-bit SAR ADCs (e.g., ADS8422) with minimal added noise and distortion. IC Role / Device Role / Timing Role: High-fidelity voltage follower and gain stage placed immediately before ADC input to preserve dynamic range and settling accuracy. Use Value: 1.2nV/√Hz input noise and –96dBc THD ensure >90dB SNR and >15.5 ENOB at 1MHz, directly extending effective resolution of the ADC subsystem. | Use Scenario: Amplifying low-amplitude, wideband echo signals (1–15MHz) from piezoelectric transducers in portable ultrasound scanners. IC Role / Device Role / Timing Role: First-stage low-noise amplifier (LNA) with adjustable DC offset to condition weak return pulses prior to variable-gain amplification and digitization. Use Value: 100MHz bandwidth and 100V/μs slew rate support full imaging bandwidth without phase distortion; offset nulling compensates for transducer DC drift. |
| Video Line Driver | Active Filter Building Block |
Use Scenario: Driving 75Ω coaxial video cables in broadcast-grade analog video distribution or test equipment outputs. IC Role / Device Role / Timing Role: High-current output buffer configured as gain-of-two inverting amplifier to match impedance and maintain flat frequency response to 100MHz. Use Value: 200mA output drive and 100MHz bandwidth ensure full HD (1080p60) signal integrity with <0.1dB flatness to 9MHz and minimal group delay variation. | Use Scenario: Implementing high-Q, low-noise Sallen-Key or multiple-feedback active filters in communication channel selection and anti-aliasing paths. IC Role / Device Role / Timing Role: Core op-amp in 2nd-order low-pass filter (e.g., f3dB = 10MHz) requiring >100MHz GBW headroom for linear phase and minimal passband ripple. Use Value: Unity-gain stability and 120MHz bandwidth enable clean filter responses up to ~12MHz without peaking or instability, even with reactive feedback networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA656U | Lower 4.8nV/√Hz noise, 500MHz GBW, but only 120mA output drive and no offset null pins. | Better for ultra-low-noise photodiode TIA; unsuitable for heavy 150Ω loads or precision DC offset trimming. | Select THS4031CD when both low noise AND high output current + offset adjustment are required. |
| LMH6629MA | 1.4nV/√Hz noise, 1.5GHz GBW, but higher 12.5mA supply current and no dedicated null pins. | Preferred for RF/IF gain blocks >100MHz; lacks integrated offset trim for precision DC-coupled stages. | Choose THS4031CD for balanced wideband performance with DC precision features in industrial DAQ. |
Compared with OPA656U and LMH6629MA, THS4031CD uniquely combines sub-1.3nV/√Hz noise, 200mA drive, and offset nulling in a single SOIC-8 package - making it optimal for cost-sensitive, space-constrained precision analog front-ends where DC accuracy and AC fidelity are co-required.
Availability
THS4031CD is available at Aetrix Electronics and suitable for high-speed data acquisition, medical ultrasound imaging, broadcast video infrastructure, and precision test equipment requiring stable component supply across extended temperature ranges (0°C to 70°C).
Supply support for THS4031CD 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, embedded processing, and connectivity technologies, with decades of heritage in high-performance op-amps and precision signal chain solutions.
The THS403x product line was designed specifically for demanding wideband, low-distortion applications - including ADC buffering, ultrasound, video, and communications - where simultaneous low noise, high speed, and DC precision are non-negotiable.
FAQ
What is the maximum recommended supply voltage for THS4031CD?
The THS4031CD supports dual-supply operation from ±4.5V to ±16V (32V total), with absolute maximum rating of ±16.5V. Operation beyond ±16V risks permanent damage per TI SLOS224L Absolute Maximum Ratings. For reliable long-term use, stay within ±15V nominal, especially at elevated temperatures.
Does THS4031CD require external compensation for unity-gain stability?
No - the THS4031CD is internally compensated and unity-gain stable, delivering 120MHz bandwidth at G = 1. This eliminates need for external compensation components. However, capacitive loads >10pF on the output require a series isolation resistor (≥20Ω) to maintain phase margin and prevent ringing.
How is the offset nulling function implemented on THS4031CD?
The THS4031CD provides dedicated NULL pins (1 and 8) for offset adjustment. Connect a 10kΩ potentiometer between pins 1 and 8, with its wiper tied to VCC–. Adjusting the potentiometer changes the internal current balance, reducing input offset voltage to <10μV - a capability not present in the THS4032 or most competing high-speed op-amps.
Can THS4031CD drive a 150Ω load at full bandwidth?
Yes - the THS4031CD delivers 100MHz bandwidth and –81dBc THD at 1MHz into 150Ω (per RL = 150Ω specs), with ±12.9V output swing and 200mA drive capability. This makes it suitable for 75Ω video line driving (with proper termination) and other low-Z wideband applications without external buffers.
What is the thermal resistance (RθJA) of THS4031CD in SOIC-8 package?
The THS4031CD in D (SOIC-8) package has RθJA = 124.5°C/W, as specified in TI SLOS224L Section 5.4. This value assumes JEDEC-standard 2-layer board with 1in² copper area. For high-power operation (>100mW dissipation), add thermal vias under the package or use forced airflow to maintain junction temperature below 130°C.
THS4031CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 100V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 MHz
- Current - Input Bias:
- 3 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 8.5mA
- Current - Output / Channel:
- 90 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS4031CD FAQ
1.How can I place an order for THS4031CD through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4031CD 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 THS4031CD reliable?
The price and inventory of THS4031CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4031CD is usually 5 days.
3.What payment methods are accepted for THS4031CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4031CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4031CD?
THS4031CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4031CD 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 THS4031CD?
For technical support, including THS4031CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4031CD requirements.
6.How does Aetrix verify that THS4031CD is sourced from the original manufacturer or authorized distributors?
All THS4031CD 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 THS4031CD meets industry standards.
7.What is the process for return or replacement of THS4031CD?
All THS4031CD units undergo pre-shipment inspection (PSI). If there is an issue with THS4031CD, 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 THS4031CD part is unused and in its original packaging.
Return procedure for THS4031CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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