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Texas Instruments THS3491YR
- Part No.:
- THS3491YR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
THS3491YR.pdf
- Description:
- 900-MHZ HIGH-POWER-OUTPUT CURREN
- Quantity:
- Payment:
- Shipping:
Inventory:2,844
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Product details
Overview
THS3491YR from Texas Instruments is a 900-MHz current feedback amplifier (CFA) designed for high-power, low-distortion output driving in wideband analog signal paths. It delivers ±420 mA linear output current, 8000 V/µs slew rate, and 1.7 nV/√Hz input voltage noise under ±15-V supplies, enabling high-fidelity arbitrary waveform generation into 100-Ω loads.
For engineers reviewing the THS3491YR datasheet, THS3491YR pinout, THS3491YR application, or THS3491YR equivalent, this device is selected for demanding high-voltage, high-slew-rate applications where harmonic distortion below –75 dBc at 50 MHz and sub-1.5% overshoot are critical design requirements.
Technical Context
The THS3491YR implements a current feedback architecture with fixed transimpedance gain (ZOL ≈ 5–8 MΩ), enabling near-constant bandwidth across gains (2–20 V/V). Its high-speed internal node drives a robust output stage capable of sourcing/sinking >500 mA peak current while maintaining <1.3 ns rise/fall times and thermal shutdown protection.
It features dual supply operation (±7 V to ±16 V), power-down control (PD pin), junction temperature sensing (TJ_SENSE on Pin 6), and optimized layout support via exposed thermal pad. The RGT package (VQFN-16) provides lower thermal resistance (RθJB = 23.1 °C/W) than legacy DDA (HSOIC-8), improving power handling in compact PCB designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 900 MHz at 2 VPP output - enables stable closed-loop operation up to UHF frequencies with minimal phase margin loss |
| Slew rate | 8000 V/µs - supports clean 10-V step response with 1.3 ns rise time and only 1.5% overshoot |
| Linear output current | ±420 mA - drives heavy capacitive loads (e.g., piezo elements, FET gates) without clipping or distortion |
| Input voltage noise | 1.7 nV/√Hz - preserves SNR in precision wideband amplification chains |
| Harmonic distortion | HD2/HD3 < –75 dBc at 50 MHz, 10 VPP - meets spectral purity requirements for test equipment and communications drivers |
| Supply range | ±7 V to ±16 V dual supply - accommodates high-output-swing systems requiring >28 VPP into 100 Ω |
| Quiescent current | 16.8 mA (trimmed, low tempco) - balances performance and power efficiency in continuous high-speed operation |
Pinout & Package
VQFN-16 (RGT) package: 3.00 mm × 3.00 mm body with exposed thermal pad (electrically isolated, recommended connection to GND plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback input | Current feedback node - connects to output via external resistor network to set gain and stability |
| 3 (VIN−), 4 (VIN+) | Differential input | Inverting/noninverting inputs - high-impedance nodes optimized for CFA topology; ZIN− ≈ 15 Ω, ZIN+ ≈ 50 kΩ || 1.2 pF |
| 6 (TJ_SENSE) | Temperature monitor output | Analog voltage (1.06 V @ 25°C, 3.2 mV/°C) - enables real-time die temperature monitoring without external sensor |
| 7, 8 (–VS), 13, 14 (+VS) | Power supply terminals | Dual-supply pins - four dedicated supply connections improve PSRR (77–82 dB) and reduce ground bounce in high-current switching |
| 10, 11 (VOUT) | Amplifier output | Parallel-output configuration - supports >500 mA peak drive into low-Z or capacitive loads with shared current path |
| 16 (PD) | Power-down control | Active-high enable - disables amplifier with 4 µs turnoff delay; reduces supply current to <1 mA per rail |
Key Features
| Feature | Design Value |
|---|---|
| High-power current feedback architecture | Delivers 900-MHz bandwidth and 8000 V/µs slew rate simultaneously - eliminates trade-off between speed and output drive capability |
| Integrated junction temperature sensing | TJ_SENSE pin provides calibrated 1.06 V output at 25°C with ±0.135 V tolerance and 3.2 mV/°C slope - enables system-level thermal management without external circuitry |
| Robust output protection | Includes current limiting and thermal shutdown - prevents latch-up or damage during overload or short-circuit conditions |
| Low-distortion wideband operation | HD2/HD3 < –75 dBc at 50 MHz, 10 VPP into 100 Ω - satisfies spectral purity requirements for LCR meters and VDSL line drivers |
| Optimized thermal performance | RθJB = 23.1 °C/W (VQFN) - allows sustained 500-mA peak output current in space-constrained PCB layouts with standard copper pour |
Applications
| Arbitrary Waveform Generation | LCR Meter Output Driver |
|---|---|
|
Use Scenario: Generating precise, high-voltage (>20 VPP), multi-frequency test waveforms for semiconductor parametric testing. IC Role / Device Role / Timing Role: Final-stage wideband output driver with programmable gain and low group delay. Use Value: 900-MHz bandwidth and 1.7 nV/√Hz noise preserve waveform fidelity; ±420 mA linear output ensures accurate impedance sweep across 10 Hz–10 MHz range. |
Use Scenario: Driving unknown reactive loads (capacitors, inductors) with known AC excitation signals in automated component testers. IC Role / Device Role / Timing Role: High-slew-rate, low-distortion stimulus source delivering calibrated sine waves at variable frequencies. Use Value: HD2/HD3 < –75 dBc at 50 MHz minimizes measurement error; 8000 V/µs slew rate enables fast settling for rapid impedance sweeps. |
| Piezo Element Driver | VDSL Line Driver |
|
Use Scenario: Actuating high-capacitance piezoelectric transducers in ultrasonic imaging or precision positioning systems. IC Role / Device Role / Timing Role: High-current, high-voltage buffer amplifying low-impedance DAC outputs to drive >10 nF loads. Use Value: 500 mA peak output current and 1.3 ns rise time enable fast, low-overshoot step response essential for nanometer-resolution motion control. |
Use Scenario: Transmitting broadband DSL signals (up to 30 MHz) over twisted-pair telephone lines with stringent spectral mask compliance. IC Role / Device Role / Timing Role: Line driver with controlled output impedance and high common-mode rejection for full-duplex transmission. Use Value: CMRR > 75 dB and PSRR > 77 dB suppress supply and common-mode noise; 28 VPP swing into 100 Ω meets ITU-T G.993.2 line power requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed current feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3095DDA | Lower 190-MHz bandwidth, 1200 V/µs slew rate, ±250 mA linear output; HSOIC-8 package only | Legacy upgrade path only - lacks TJ_SENSE, power-down, and VQFN thermal performance | Choose THS3095DDA only for drop-in replacement in existing THS3091/3095 designs where bandwidth <200 MHz suffices |
| THS3217D | Higher 1.8-GHz bandwidth but lower ±250 mA output drive; no power-down or temperature sense; SOIC-8 package | Targeted at RF IF amplification, not high-current load driving - unsuitable for piezo or FET gate driving | Choose THS3217D when ultra-wideband small-signal gain is primary need, not high-voltage/high-current output capability |
Compared with THS3095DDA and THS3217D, the THS3491YR uniquely combines 900-MHz bandwidth, ±420 mA linear output, integrated thermal monitoring, and power-down control - making it the only option for new high-fidelity, high-power arbitrary waveform generator and LCR meter designs requiring both speed and drive strength.
Availability
THS3491YR is available at Aetrix Electronics and suitable for high-voltage arbitrary waveform generators, LCR meter output stages, and VDSL line drivers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for THS3491YR 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 signal chain solutions.
The THS3491YR belongs to TI's high-speed current feedback amplifier product line, engineered specifically for applications demanding simultaneous wide bandwidth, high output current, and ultra-low distortion - such as test and measurement instrumentation and broadband communications infrastructure.
FAQ
What is the maximum output voltage swing of the THS3491YR?
The THS3491YR delivers up to 28 VPP output swing into a 100-Ω load when operated from ±16-V supplies. This is enabled by low output headroom (HROUT = 1.2–1.7 V) and high linear output current (±420 mA), allowing greater usable voltage range than legacy amplifiers like the THS3095 under identical supply conditions. The THS3491YR achieves this while maintaining <1.5% overshoot on 10-V steps.
Does the THS3491YR support single-supply operation?
Yes, the THS3491YR supports single-supply operation from 14 V to 32 V. Its input common-mode range extends to within 4.1 V of either rail (HRIN), and output can swing to within 1.2 V of either supply (HROUT), enabling use in grounded-load configurations. However, optimal distortion and bandwidth performance is specified under dual-supply conditions (±15 V), and the TJ_SENSE and PD functions require proper reference setup in single-supply mode.
How does the TJ_SENSE pin on the THS3491YR function?
The TJ_SENSE pin (Pin 6, VQFN-16 only) outputs a voltage proportional to die temperature: 1.06 V at 25°C with a 3.2 mV/°C coefficient. It is internally connected to the REF pin and has 35 kΩ input impedance. This feature allows real-time thermal monitoring without external sensors - critical for protecting the THS3491YR during high-current operation and enabling dynamic thermal derating in closed-loop systems.
What is the purpose of the dual VOUT pins (10 and 11) on the THS3491YR?
Pins 10 and 11 are electrically parallel output terminals on the THS3491YR, designed to reduce bond-wire inductance and distribute high-frequency current flow. This dual-output configuration lowers effective output impedance and improves stability when driving heavy capacitive loads (e.g., >1 nF), supporting the THS3491YR's ability to deliver >500 mA peak current with minimal ringing or overshoot - a key advantage over single-output CFAs in piezo and FET driver applications.
Is the THS3491YR pin-compatible with the THS3095DDA?
No, the THS3491YR (VQFN-16) is not pin-compatible with the THS3095DDA (HSOIC-8). They differ in package type, pin count, pin functions (e.g., THS3491YR includes TJ_SENSE and dual VOUT), and supply pin arrangement. While the THS3491YR is described as a "pin-compatible upgrade" in marketing context, this refers only to functional equivalence in certain circuit topologies - not mechanical or electrical pin mapping. Migration requires PCB redesign and layout optimization for thermal and high-speed performance.
THS3491YR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 8000V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 900 MHz
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 16.8mA
- Current - Output / Channel:
- 620 mA
- Voltage - Supply Span (Min):
- 14 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
THS3491YR FAQ
1.How can I place an order for THS3491YR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3491YR 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 THS3491YR reliable?
The price and inventory of THS3491YR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3491YR is usually 5 days.
3.What payment methods are accepted for THS3491YR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3491YR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3491YR?
THS3491YR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3491YR 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 THS3491YR?
For technical support, including THS3491YR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3491YR requirements.
6.How does Aetrix verify that THS3491YR is sourced from the original manufacturer or authorized distributors?
All THS3491YR 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 THS3491YR meets industry standards.
7.What is the process for return or replacement of THS3491YR?
All THS3491YR units undergo pre-shipment inspection (PSI). If there is an issue with THS3491YR, 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 THS3491YR part is unused and in its original packaging.
Return procedure for THS3491YR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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