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High Speed FET-Input Operational Amplifier


Package | PIN: DDA | 8
Temp: I (-40 to 85)
Carrier: Partial Tube
Qty Price
1-9 $6.40
10-24 $5.76
25-99 $5.38
100-249 $4.82
250-499 $4.50
500-749 $3.92
750-999 $3.39
1000+ $3.32


  • High Bandwidth:
    • 325 MHz in Unity Gain
    • 210 MHz Gain Bandwidth Product
  • High Slew Rate:
    • 900 V/µs (G = 2)
    • 1000 V/µs (G = 5)
  • Low Distortion of –76 dB, SFDR at 5 MHz
  • Maximum Input Bias Current: 100 pA
  • Input Voltage Noise: 7 nV/√Hz
  • Maximum Input Offset Voltage: 500 µV at 25°C
  • Low Offset Drift: 2.5 µV/°C
  • Input Impedance: 109 || 3.9 pF
  • Wide Supply Range: ± 5 V to ± 15 V
  • High Output Current: 95 mA

Texas Instruments  THS4631DDA

The THS4631 is a high-speed, FET-input operational amplifier designed for applications requiring wideband operation, high-input impedance, and high-power supply voltages. By providing a 210-MHz gain bandwidth product, ±15-V supply operation, and 100-pA input bias current, the THS4631 is capable of simultaneous wideband transimpedance gain and large output signal swing. The fast 1000 V/µs slew rate allows for fast settling times and good harmonic distortion at high frequencies. Low current and voltage noise allow amplification of extremely low-level input signals while still maintaining a large signal-to-noise ratio.

The characteristics of the THS4631 make it ideally suited for use as a wideband photodiode amplifier. Photodiode output current is a prime candidate for transimpedance amplification as shown below. Other potential applications include test and measurement systems requiring high-input impedance, ADC and DAC buffering, high-speed integration, and active filtering.

The THS4631 is offered in an 8-pin SOIC (D), and the 8-pin SOIC (DDA) and MSOP (DGN) with PowerPAD™ package.