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Texas Instruments THS4021CDGNR
- Part No.:
- THS4021CDGNR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
THS4021CDGNR.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,475
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Product details
Overview
THS4021CDGNR from Texas Instruments is a single-channel, ultra-low-noise (1.2 nV/√Hz), high-speed voltage-feedback operational amplifier optimized for gain ≥10 V/V stable operation. It delivers 290 MHz small-signal bandwidth, 470 V/µs slew rate, and 30 ns settling time (0.1%) at G = 10, enabling precision signal conditioning in ultrasound front-ends and source measurement units.
For engineers reviewing the THS4021CDGNR datasheet, THS4021CDGNR pinout, THS4021CDGNR application, or THS4021CDGNR equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for low-distortion, high-bandwidth analog signal paths.
Technical Context
The THS4021CDGNR employs a voltage-feedback architecture with internal compensation optimized for minimum-phase stability at closed-loop gains of 10 V/V or higher - not unity-gain stable. Its 2 GHz gain-bandwidth product supports wideband applications requiring flat frequency response up to 290 MHz (G = 10) while maintaining low distortion (–68 dBc THD at 1 MHz).
It features dedicated offset nulling pins (Pins 1 & 8), rail-to-rail output swing capability (±12.9 V into 250 Ω at ±15 V supplies), and operates across dual supplies from ±4.5 V to ±16 V. Input voltage noise dominates over current noise (1.2 nV/√Hz vs. 2.3 pA/√Hz), making it ideal for high-source-impedance sensor interfaces where voltage noise is the limiting factor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 2 GHz - enables stable closed-loop designs at ≥10 V/V with usable bandwidth up to 290 MHz |
| Voltage noise density | 1.2 nV/√Hz - sets fundamental SNR floor for low-level signal amplification in imaging and metrology |
| Slew rate | 470 V/µs - supports fast transient response without slewing-induced distortion in pulse-based systems |
| Settling time (0.1%) | 30 ns - ensures accurate digitization of rapidly changing signals in high-speed data acquisition |
| THD @ 1 MHz | –68 dBc (RL = 150 Ω) - meets stringent linearity requirements for spectral purity in communication and test equipment |
| Supply range | ±4.5 V to ±16 V - accommodates both low-voltage portable and high-dynamic-range industrial power rails |
| Output drive | 200 mA (typical) - drives heavy loads including coaxial cables and active filters without external buffering |
Pinout & Package
THS4021CDGNR is packaged in an 8-pin HVSSOP (DGN) thermally enhanced surface-mount package with exposed thermal pad (pin 0), measuring 3.0 mm × 3.0 mm × 0.8 mm. This compact footprint supports high-density PCB layouts while delivering 58.4°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | NULL | Offset voltage adjustment inputs - connect external potentiometer (10 kΩ) between Pins 1 & 8, wiper to VCC– to trim input offset |
| 2 | IN– | Inverting input - primary feedback node for standard op-amp configurations (inverting, transimpedance) |
| 3 | IN+ | Noninverting input - used in noninverting, differential, or instrumentation amplifier topologies |
| 4 | VCC– | Negative supply rail - must be decoupled locally with ≥0.1 µF ceramic capacitor to ground |
| 5 | NC | No connection - electrically isolated; no trace or copper pour should contact this pad |
| 6 | OUT | Amplifier output - capable of ±12.9 V swing into 250 Ω at ±15 V supplies; requires output series resistor for capacitive load isolation |
| 7 | VCC+ | Positive supply rail - must be decoupled locally with ≥0.1 µF ceramic capacitor to ground |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low voltage noise | 1.2 nV/√Hz - preserves signal integrity in low-amplitude sensor interfaces (e.g., piezoelectric ultrasound transducers) |
| Gain ≥10 V/V stability | Internally compensated for minimum-phase response at G ≥ 10 - eliminates need for external compensation networks |
| High output current | 200 mA drive capability - directly drives 50 Ω or 75 Ω transmission lines and active filter stages without buffer amplifiers |
| Offset nulling interface | Dedicated NULL pins (1 & 8) - enables sub-mV DC accuracy in precision measurement circuits without trimming resistors on signal path |
| Wide supply range | ±4.5 V to ±16 V - supports flexible system-level power architecture including split-rail and battery-powered designs |
Applications
| Ultrasound Scanner Front-End | Source Measurement Unit (SMU) |
|---|---|
Use Scenario: Amplifying weak RF echo signals from piezoelectric transducers after time-gain compensation (TGC). IC Role / Device Role / Timing Role: Low-noise preamplifier stage with fixed gain ≥10 V/V and minimal added distortion. Use Value: 1.2 nV/√Hz input voltage noise maximizes dynamic range for detecting microvolt-level echoes; 290 MHz bandwidth supports >10 MHz imaging frequencies. |
Use Scenario: Precision voltage-controlled current source/sink for semiconductor device characterization under bias. IC Role / Device Role / Timing Role: High-slew-rate output driver in feedback loop of SMU's force-and-measure circuitry. Use Value: 470 V/µs slew rate enables rapid current step transitions (<30 ns settling); 200 mA output sustains compliance across wide load impedances. |
| Power Quality Meter Signal Chain | High-Speed Data Acquisition Buffer |
Use Scenario: Conditioning AC voltage/current waveforms (50/60 Hz + harmonics up to 3 kHz) before ADC sampling. IC Role / Device Role / Timing Role: Anti-aliasing filter driver and level-shifter interfacing with SAR or sigma-delta ADCs. Use Value: –68 dBc THD at 1 MHz ensures harmonic content remains below quantization noise floor; ±12.9 V swing accommodates full-scale metering ranges. |
Use Scenario: Driving multiplexed ADC inputs in multi-channel oscilloscopes or spectrum analyzers operating at ≥100 MSPS. IC Role / Device Role / Timing Role: Track-and-hold buffer with low charge injection and fast settling for pipeline ADC front-ends. Use Value: 30 ns 0.1% settling time matches high-speed sampling clocks; 2 GHz GBW maintains phase coherence across wide input bandwidths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6629MA/NOPB | Lower voltage noise (0.94 nV/√Hz), but only stable at G ≥ 5 V/V; 1.5 GHz GBW; no offset null pins | Better SNR in ultra-low-noise preamps, but less margin for gain stability in fixed-G ≥10 designs | Select when absolute lowest noise dominates over offset adjustability and stability margin |
| OPA656U | Higher precision (0.1 mV VOS, 10 µV/°C drift), lower THD (–72 dBc), but 500 MHz GBW and 270 V/µs slew rate | Superior DC accuracy and distortion performance, but reduced bandwidth and slew for fast transient handling | Select when DC stability and harmonic suppression outweigh raw speed requirements |
Compared with LMH6629MA/NOPB and OPA656U, THS4021CDGNR uniquely balances 2 GHz gain-bandwidth, 1.2 nV/√Hz noise, and guaranteed ≥10 V/V stability - making it optimal for wideband, gain-fixed, low-distortion signal chains where offset trimming is required.
Availability
THS4021CDGNR is available at Aetrix Electronics and suitable for ultrasound scanner front-ends, source measurement units, and power quality meters requiring stable component supply, long-term production continuity, and TI-qualified high-reliability packaging.
Supply support for THS4021CDGNR 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 signal chain solutions.
The THS402x family was designed specifically for demanding wideband, low-noise applications such as medical imaging, automated test equipment, and precision instrumentation - prioritizing noise, speed, and stability over DC precision.
FAQ
What is the minimum stable gain for THS4021CDGNR?
The THS4021CDGNR is internally compensated for stable operation at closed-loop gains of 10 V/V or greater. It is not unity-gain stable; attempting G < 10 V/V may cause peaking or oscillation. For lower-gain applications, external compensation or a different amplifier (e.g., THS4031) is required. Always verify stability with actual layout and load conditions per TI's application notes.
Does THS4021CDGNR support single-supply operation?
Yes, THS4021CDGNR supports single-supply operation from 9 V to 32 V. The input common-mode range extends to within 1.2 V of each rail (e.g., 1.2 V to 30.8 V at VCC = 32 V), and output swing reaches within 1.1 V of each rail into 1 kΩ. Proper level-shifting and biasing of IN+ and IN– are required to maintain linear operation in single-supply configurations.
How do I use the NULL pins on THS4021CDGNR?
Pins 1 and 8 are offset null terminals. Connect a 10 kΩ potentiometer across them, with the wiper tied to VCC–. Adjusting the potentiometer minimizes input offset voltage - critical for DC-coupled precision applications. Do not leave these pins floating or shorted; unused NULL connections degrade PSRR and CMRR performance per TI's datasheet recommendations.
What thermal considerations apply to THS4021CDGNR in HVSSOP (DGN) package?
The THS4021CDGNR in DGN package has RθJA = 58.4°C/W (JEDEC-standard board). At 7.8 mA ICC and ±15 V supplies, power dissipation is ~0.24 W - resulting in ~14°C junction rise above ambient. For continuous 200 mA output, thermal design must ensure TJ ≤ 125°C. Use the exposed thermal pad (pin 0) with ≥3 thermal vias to inner ground plane to reduce RθJB and improve reliability.
Can THS4021CDGNR drive a 50 Ω load directly?
Yes, THS4021CDGNR can drive 50 Ω loads with up to ±3.5 V output swing at ±5 V supplies and ±12.9 V at ±15 V supplies. However, sustained 200 mA output into 50 Ω causes significant self-heating. For continuous 50 Ω driving, limit output amplitude, add a series 22–47 Ω resistor to isolate capacitive effects, and verify thermal derating. TI recommends using it into ≥150 Ω for full-spec performance.
THS4021CDGNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 470V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 350 MHz
- Current - Input Bias:
- 3 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 7.8mA
- Current - Output / Channel:
- -
- 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-HVSSOP
THS4021CDGNR FAQ
1.How can I place an order for THS4021CDGNR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4021CDGNR 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 THS4021CDGNR reliable?
The price and inventory of THS4021CDGNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4021CDGNR is usually 5 days.
3.What payment methods are accepted for THS4021CDGNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4021CDGNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4021CDGNR?
THS4021CDGNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4021CDGNR 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 THS4021CDGNR?
For technical support, including THS4021CDGNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4021CDGNR requirements.
6.How does Aetrix verify that THS4021CDGNR is sourced from the original manufacturer or authorized distributors?
All THS4021CDGNR 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 THS4021CDGNR meets industry standards.
7.What is the process for return or replacement of THS4021CDGNR?
All THS4021CDGNR units undergo pre-shipment inspection (PSI). If there is an issue with THS4021CDGNR, 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 THS4021CDGNR part is unused and in its original packaging.
Return procedure for THS4021CDGNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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