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Texas Instruments THS4271DGN
- Part No.:
- THS4271DGN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
THS4271DGN.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,534
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Product details
Overview
THS4271DGN from Texas Instruments is a low-noise, high-slew-rate, unity-gain-stable voltage-feedback amplifier in an 8-pin MSOP PowerPAD™ package. It delivers 1.4 GHz small-signal bandwidth, 1000 V/μs slew rate, and –92 dBc THD at 30 MHz under ±5 V supply, targeting high-linearity signal conditioning in RF receiver chains and ADC preamplifier stages.
For engineers reviewing the THS4271DGN datasheet, THS4271DGN pinout, THS4271DGN application, or THS4271DGN equivalent, this page provides verified electrical specifications, thermal-aware package layout guidance, distortion vs. frequency behavior, and validated alternatives for wideband analog front-end design.
Technical Context
The THS4271DGN employs a voltage-feedback architecture with unity-gain stability across ±2.5 V to ±5 V dual supplies or 5 V to 10 V single supply. Its internal compensation enables stable operation without external phase compensation networks, unlike decompensated amplifiers requiring careful gain-setting resistor selection.
It features low input voltage noise (3 nV/√Hz), low harmonic distortion (–92 dBc HD2/HD3 at 30 MHz), and high output drive capability (±4 V swing into 150 Ω). Thermal derating is critical: oscillation may occur above +60°C junction temperature, requiring proper PowerPAD™ thermal connection to PCB ground plane.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 1.4 GHz at G = 1, ±5 V supply - supports direct sampling of IF signals up to UHF band without intermediate gain stages. |
| Slew rate | 1000 V/μs at G = –1 - enables clean reproduction of fast transient signals such as radar pulses or high-speed DAC outputs. |
| THD @ 30 MHz | –92 dBc at 1 VPP, RL = 150 Ω - ensures minimal spectral contamination in wideband communication receivers. |
| Input voltage noise | 3 nV/√Hz at 1 MHz - preserves SNR in low-level sensor or antenna preamp applications where noise dominates dynamic range. |
| Supply range | ±2.5 V to ±5 V (dual) or 5 V to 10 V (single) - compatible with both legacy ±5 V systems and modern low-voltage mixed-signal platforms. |
| Quiescent current | 22–28 mA max at ±5 V - balances performance and power efficiency for continuous-wave analog signal paths. |
| Output swing | ±3.7 V min into 150 Ω at G = +2 - delivers full-scale drive to 14-bit+ ADCs while maintaining linearity. |
Pinout & Package
The THS4271DGN uses an 8-pin MSOP package with exposed PowerPAD™ thermal pad (package code DGN), requiring soldering to a thermally conductive PCB copper plane to maintain TJ ≤ +60°C and prevent oscillation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No internal connection | Must be left unconnected; no routing or grounding required. |
| 2 IN− | Inverting input | Differential input node; matched trace length critical for common-mode rejection above 10 MHz. |
| 3 IN+ | Non-inverting input | High-impedance input (5 MΩ); requires symmetric layout and guard ring for optimal noise performance. |
| 4 VS− | Negative supply rail | Connect directly to low-inductance ground plane; decoupling capacitor (0.1 μF + 4.7 μF) required within 2 mm. |
| 5 NC | No internal connection | Must be left unconnected; not tied to PowerPAD™ or any net. |
| 6 VS+ | Positive supply rail | Connect to stable +5 V (or +VS); separate decoupling from VS− improves PSRR > 70 dB up to 10 MHz. |
| 7 VOUT | Amplifier output | Capable of sourcing 160 mA / sinking 80 mA; use series resistor (249 Ω typical) for impedance matching to 50 Ω systems. |
| 8 NC | No internal connection | Must be left unconnected; isolated from PowerPAD™ per TI thermal guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Operates stably at G = 1 without external compensation, eliminating risk of peaking or ringing in buffer configurations. |
| PowerPAD™ thermal enhancement | θJC = 4.7 °C/W enables reliable 28 mA operation at ambient ≤ +70°C when PowerPAD™ is soldered to ≥2 cm² inner-layer copper. |
| Low distortion at high frequency | –80 dBc third-harmonic distortion at 30 MHz ensures clean spectrum for LTE/WiMAX baseband upconversion. |
| High slew rate | 1000 V/μs supports <10 ns settling to 0.1% for 4 V step inputs - suitable for pulsed radar and time-of-flight signal conditioning. |
| Wide common-mode input range | ±3.5 V at +25°C allows direct interfacing with ±3.3 V logic or differential ADC drivers without level-shifting. |
Applications
| High Linearity ADC Preamplifier | Wireless Communication Receivers |
|---|---|
Use Scenario: Driving the input of a 14-bit, 105 MSPS pipeline ADC in a broadband spectrum analyzer frontend. IC Role / Device Role / Timing Role: Single-ended-to-differential conversion and gain stage with 2× fixed gain, preserving SFDR > 85 dBc. Use Value: Achieves –92 dBc THD at 30 MHz, enabling accurate digitization of multi-tone RF signals without harmonic folding. |
Use Scenario: IF amplifier in a zero-IF LTE femtocell receiver operating at 190–210 MHz. IC Role / Device Role / Timing Role: Low-noise, high-linearity gain block after quadrature downconversion, before baseband filtering. Use Value: 3 nV/√Hz input noise and –60 dBc IMD3 at 70 MHz ensure >130 dBc/Hz adjacent channel rejection. |
| Differential to Single-Ended Conversion | DAC Output Buffer |
Use Scenario: Converting differential I/Q outputs from a wideband DAC (e.g., DAC3484) to single-ended signals for SAW filter input. IC Role / Device Role / Timing Role: Precision gain stage with matched input impedance and low group delay variation. Use Value: 0.004° differential phase error preserves QAM constellation integrity up to 64-QAM in 20 MHz channels. |
Use Scenario: Buffering the output of a high-speed video DAC (e.g., THS7374) in broadcast-grade SDI transmitter. IC Role / Device Role / Timing Role: High-slew-rate output driver delivering 1 VPP into 75 Ω load with minimal overshoot. Use Value: 1000 V/μs slew rate and 25 ns 0.1% settling time prevent edge smearing in 1.485 Gbps serial digital video. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4275DGN | Identical AC/DC specs but adds power-down pin (PD on Pin 5); quiescent current drops to ≤1.2 mA in shutdown. | Required in battery-powered or burst-mode systems needing dynamic power gating. | Select THS4275DGN only if active power management is needed; THS4271DGN avoids PD pin routing complexity. |
| LMH6629MA/NOPB | Lower noise (1.9 nV/√Hz), lower bandwidth (1.5 GHz), higher quiescent current (30 mA), SOIC-8 package (no PowerPAD™). | Better SNR in ultra-low-noise preamps; less suitable for thermally constrained layouts due to higher θJA (105 °C/W). | Choose LMH6629MA/NOPB when noise floor dominates over thermal design constraints and board space permits larger SOIC footprint. |
Compared with THS4275DGN, THS4271DGN eliminates power-down circuitry for simpler biasing and reduced BOM count; versus LMH6629MA/NOPB, it trades 1.1 nV/√Hz noise for superior thermal performance via PowerPAD™ and lower static power, making it preferable in compact, high-density RF modules.
Availability
THS4271DGN is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless infrastructure transceivers, and broadcast video signal conditioning requiring stable component supply and guaranteed long-term manufacturability.
Supply support for THS4271DGN 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 amplifiers and precision signal chain solutions.
The THS4271DGN belongs to TI's high-speed voltage-feedback amplifier product line, engineered specifically for wideband, low-distortion analog signal paths in communications, test equipment, and medical imaging systems.
FAQ
What is the maximum safe junction temperature for continuous operation of the THS4271DGN?
The THS4271DGN must be operated with junction temperature ≤ +60°C to prevent low-level oscillation. This limit is stricter than the +125°C long-term reliability rating. Proper thermal design-soldering the PowerPAD™ to ≥2 cm² of inner-layer copper with thermal vias-is mandatory to sustain 28 mA quiescent current at +70°C ambient.
Does the THS4271DGN require external compensation for unity-gain stability?
No, the THS4271DGN is internally compensated for unity-gain stability. It operates stably with closed-loop gains from –1 to +10 without external compensation components. This eliminates tuning uncertainty and layout sensitivity associated with decompensated amplifiers like the THS4211.
Can the THS4271DGN be used with a single 5-V supply?
Yes, the THS4271DGN supports single-supply operation from 5 V to 10 V. At VS = 5 V, its small-signal bandwidth is 1.2 GHz, slew rate is 750 V/μs, and output swing is 1.2 V to 3.8 V (min) with G = +2. Input common-mode range is 1.4 V to 3.6 V, requiring appropriate DC biasing for AC-coupled sources.
What is the purpose of the three NC pins on the THS4271DGN package?
Pins 1, 5, and 8 of the THS4271DGN are designated NC (no internal connection) and must remain unconnected. They are not tied to the PowerPAD™ or any internal node. Routing traces or applying solder mask to these pins is acceptable, but grounding or connecting them risks parasitic coupling or thermal imbalance affecting stability.
How does the THS4271DGN's distortion performance compare at different load impedances?
THS4271DGN harmonic distortion improves with higher load impedance: at 30 MHz and 1 VPP, THD is –95 dBc into 499 Ω versus –92 dBc into 150 Ω. For best linearity in receiver IF stages, use RL ≥ 499 Ω and match output impedance with a series 249 Ω resistor to preserve 50 Ω system interface while minimizing distortion.
THS4271DGN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1000V/µs
- Gain Bandwidth Product:
- 400 MHz
- -3db Bandwidth:
- 1.4 GHz
- Current - Input Bias:
- 6 µA
- Voltage - Input Offset:
- 5 mV
- Current - Supply:
- 22mA
- Current - Output / Channel:
- 160 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 15 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-HVSSOP
THS4271DGN FAQ
1.How can I place an order for THS4271DGN through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4271DGN 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 THS4271DGN reliable?
The price and inventory of THS4271DGN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4271DGN is usually 5 days.
3.What payment methods are accepted for THS4271DGN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4271DGN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4271DGN?
THS4271DGN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4271DGN 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 THS4271DGN?
For technical support, including THS4271DGN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4271DGN requirements.
6.How does Aetrix verify that THS4271DGN is sourced from the original manufacturer or authorized distributors?
All THS4271DGN 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 THS4271DGN meets industry standards.
7.What is the process for return or replacement of THS4271DGN?
All THS4271DGN units undergo pre-shipment inspection (PSI). If there is an issue with THS4271DGN, 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 THS4271DGN part is unused and in its original packaging.
Return procedure for THS4271DGN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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