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Texas Instruments THS4021ID
- Part No.:
- THS4021ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4021ID.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,567
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Product details
Overview
THS4021ID from Texas Instruments is a single-channel, ultra-low-noise (1.2 nV/√Hz), high-speed voltage-feedback operational amplifier optimized for precision signal conditioning in demanding analog front-ends. It delivers 290 MHz small-signal bandwidth at gain = 10 V/V, 470 V/µs slew rate, and 30 ns settling time (0.1%), with stable operation at gains ≥10 V/V and ±4.5 V to ±16 V dual-supply support - ideal for ultrasound scanner receive chains.
For engineers reviewing the THS4021ID datasheet, THS4021ID pinout, THS4021ID application, or THS4021ID equivalent, key selection criteria include its offset-nulling capability, low distortion (–68 dBc THD at 1 MHz), high output drive (200 mA), wide supply range, and validated performance in source measurement units and power quality meters.
Technical Context
The THS4021ID employs a voltage-feedback architecture with fully differential input stage and high-current output stage, enabling fast transient response and robust drive into reactive loads. Its stability at minimum gain of 10 V/V eliminates need for external compensation in fixed-gain configurations.
Offset nulling is implemented via dedicated pins (1 and 8), allowing precise DC calibration without trimming resistors or external circuitry. Input voltage noise remains flat at 1.2 nV/√Hz above 10 kHz, and total harmonic distortion is specified at –68 dBc under 1 MHz, 2 VPP, RL = 150 Ω conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 2 GHz - enables stable closed-loop designs up to 290 MHz at G = 10 V/V |
| Voltage noise density | 1.2 nV/√Hz - critical for low-level signal amplification in medical imaging front-ends |
| Slew rate | 470 V/µs - supports fast pulse fidelity in SMU step-response testing |
| Settling time (0.1%) | 30 ns - ensures accurate multi-sample acquisition in high-speed digitizers |
| Output current (typ) | 200 mA - drives low-impedance loads (e.g., 150 Ω cables) without gain compression |
| Supply voltage range | ±4.5 V to ±16 V - accommodates both portable (±5 V) and industrial (±15 V) systems |
| Total harmonic distortion | –68 dBc @ 1 MHz - meets spectral purity requirements in power quality analyzers |
Pinout & Package
THS4021ID is packaged in an 8-pin SOIC (D package), with thermal resistance RθJA = 124.5 °C/W. The device features offset nulling pins and no internal connection on pin 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 NULL | Offset adjust input | Connect external potentiometer (10 kΩ) between pins 1/8 and VCC–/VCC+ to null input offset voltage |
| 2 IN– | Inverting input | Differential input node; high-impedance (1 MΩ) with 1.5 pF capacitance |
| 3 IN+ | Noninverting input | Differential input node; common-mode range extends to ±14.3 V with ±15 V supplies |
| 4 VCC– | Negative power supply | Reference for internal biasing; must be decoupled with 0.1 µF ceramic capacitor |
| 5 NC | No connection | Internally unconnected; leave floating or ground for mechanical stability |
| 6 OUT | Amplifier output | Capable of ±12.9 V swing into 250 Ω and sourcing/sinking 200 mA peak current |
| 7 VCC+ | Positive power supply | Reference for internal biasing; requires local 0.1 µF ceramic + 10 µF bulk decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low voltage noise | 1.2 nV/√Hz enables detection of microvolt-level signals in ultrasound transducer interfaces |
| Stable at G ≥ 10 V/V | Eliminates external compensation components in fixed-gain instrumentation paths |
| Offset nulling pins | Allows sub-millivolt DC calibration without board-level resistor networks or laser trimming |
| High output drive | 200 mA output current supports direct driving of coaxial cables and ADC input buffers |
| Low THD at high frequency | –68 dBc @ 1 MHz ensures minimal harmonic contamination in power analyzer FFT measurements |
Applications
| Ultrasound Scanner Front-End | Source Measurement Unit (SMU) |
|---|---|
Use Scenario: Amplifying weak echo signals from piezoelectric transducers after time-gain compensation. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth gain stage in analog beamformer channel. Use Value: 1.2 nV/√Hz input noise preserves SNR of sub-100 µV signals; 290 MHz bandwidth supports >15 MHz imaging frequencies. |
Use Scenario: Precision voltage/current sourcing and sensing in semiconductor parametric test equipment. IC Role / Device Role / Timing Role: Output driver and feedback amplifier in four-quadrant force-voltage loop. Use Value: 30 ns settling time enables rapid step-and-measure cycles; 200 mA drive handles low-Z DUT loads. |
| Power Quality Meter | High-Speed Data Acquisition System |
Use Scenario: Conditioning AC line voltage and current waveforms for harmonic analysis up to 50th order. IC Role / Device Role / Timing Role: Anti-aliasing filter driver and signal gain block before sigma-delta ADC. Use Value: –68 dBc THD prevents false harmonic detection; ±15 V supply compatibility matches meter reference rails. |
Use Scenario: Buffering and level-shifting sensor outputs (e.g., strain gauges, accelerometers) into high-speed ADCs. IC Role / Device Role / Timing Role: High-fidelity signal conditioner with DC accuracy and wide dynamic range. Use Value: Offset nulling pins enable <2 mV initial VOS; 470 V/µs slew rate preserves fast transients without slewing distortion. |
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 noise (0.92 nV/√Hz) but lower slew rate (250 V/µs); no offset null pins; 270 MHz GBW | Better for ultra-low-noise DC-coupled photodiode amps; unsuitable where fast settling or nulling is required | Select OPA656U only when noise dominates over speed and offset calibration is handled externally |
| LMH6629MA | Higher slew rate (575 V/µs), similar noise (1.1 nV/√Hz), no offset null pins, unstable below G = 5 V/V | Preferred for G = 5–10 closed-loop designs needing faster edge response; lacks DC trim capability | Choose LMH6629MA when gain ≥5 suffices and board space prohibits external nulling circuitry |
Compared with THS4021ID, OPA656U trades speed and adjustability for marginally lower noise, while LMH6629MA offers higher slew rate but requires higher minimum gain and forfeits offset calibration - making THS4021ID uniquely suited for precision, variable-gain, high-speed analog front-ends requiring factory or field DC trim.
Availability
THS4021ID is available at Aetrix Electronics and suitable for ultrasound scanner design, source measurement unit development, and power quality meter production requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for THS4021ID 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 engineered specifically for ultra-low-noise, high-speed instrumentation applications - including medical imaging, automated test equipment, and precision power monitoring - where simultaneous bandwidth, linearity, and DC accuracy are non-negotiable.
FAQ
What is the minimum stable gain for THS4021ID?
The THS4021ID is internally compensated for stable operation at closed-loop gains of 10 V/V or greater (G ≥ 10). Attempting to use it at lower gains (e.g., unity gain or G = 2) will result in peaking or oscillation unless external compensation is applied - unlike some decompensated op-amps, THS4021ID does not support G < 10 without modification.
Does THS4021ID support single-supply operation?
Yes, THS4021ID supports single-supply operation from 9 V to 32 V. When operated single-ended (e.g., VCC+ = 30 V, VCC– = 0 V), the input common-mode range extends from 3.8 V to 26.2 V (at TA = 25°C), and output swing reaches ±3.5 V into 150 Ω - enabling use in rail-to-rail–compatible signal chains with proper level shifting.
How do I configure the offset null pins on THS4021ID?
Connect a 10 kΩ potentiometer between THS4021ID pins 1 and 8, with the wiper tied to VCC–. Adjusting the potentiometer changes the input stage bias current balance, reducing input offset voltage to <0.3 mV (typ) at 25°C. Do not short pins 1 and 8 or connect them directly to supply rails - this may damage the nulling circuit.
What is the maximum load capacitance THS4021ID can drive without instability?
THS4021ID can safely drive up to 100 pF capacitive load in unity-gain follower configuration with proper PCB layout (short traces, local decoupling). For loads >100 pF or closed-loop gains <10, isolation resistor (10–50 Ω) in series with the output is recommended. Driving long cables (>1 m) requires termination matching to prevent ringing - verified in TI's THS4021DGN evaluation reports.
Is THS4021ID suitable for driving ADC inputs directly?
Yes, THS4021ID is well-suited for driving SAR and sigma-delta ADC inputs due to its 30 ns (0.1%) settling time, low distortion (–68 dBc), and ability to deliver 200 mA peak current. When interfacing with switched-capacitor ADC inputs, use a series 10–22 Ω resistor between THS4021ID OUT and ADC IN to isolate capacitive kickback and maintain stability - confirmed in TI Application Report SLOA058B.
THS4021ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS4021ID FAQ
1.How can I place an order for THS4021ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4021ID 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 THS4021ID reliable?
The price and inventory of THS4021ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4021ID is usually 5 days.
3.What payment methods are accepted for THS4021ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4021ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4021ID?
THS4021ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4021ID 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 THS4021ID?
For technical support, including THS4021ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4021ID requirements.
6.How does Aetrix verify that THS4021ID is sourced from the original manufacturer or authorized distributors?
All THS4021ID 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 THS4021ID meets industry standards.
7.What is the process for return or replacement of THS4021ID?
All THS4021ID units undergo pre-shipment inspection (PSI). If there is an issue with THS4021ID, 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 THS4021ID part is unused and in its original packaging.
Return procedure for THS4021ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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