Op-Amp - OP275, Dual, Bipolar/JFET, Audio, 8-Pin DIP

Op-Amp - OP275, Dual, Bipolar/JFET, Audio, 8-Pin DIP

Op-Amp - OP275, Dual, Bipolar/JFET, Audio, 8-Pin DIP image 1
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OP275 dual audio op amp in an 8-pin DIP package. The OP275 is the first amplifier to feature the Butler Amplifier front end. This new front end design combines both bipolar and JFET transistors to attain amplifiers with the accuracy and low noise performance of bipolar transistors, and the speed and sound quality of JFETs. Total Harmonic Distortion plus Noise equals that of previous audio amplifiers, but at much lower supply currents.

A very low l/f corner of below 6 Hz maintains a flat noise density response. Whether noise is measured at either 30 Hz or 1 kHz, it is only 6 nVHz. The JFET portion of the input stage gives the OP275 its high slew rates to keep distortion low, even when large output swings are required, and the 22 V/µs slew rate of the OP275 is the fastest of any standard audio amplifier. Best of all, this low noise and high speed are accomplished using less than 5 mA of supply current, lower than any standard audio amplifier.

Improved dc performance is also provided with bias and offset currents greatly reduced over purely bipolar designs. Input offset voltage is guaranteed at 1 mV and is typically less than 200 µV. This allows the OP275 to be used in many dc-coupled or summing applications without the need for special selections or the added noise of additional offset adjustment circuitry. The output is capable of driving 600 loads to 10 V rms while maintaining low distortion. THD + Noise at 3 V rms is a low 0.0006%.


  • Excellent Sonic Characteristics
  • Low Noise: 6 nV/Hz
  • Low Distortion: 0.0006%
  • High Slew Rate: 22 V/s
  • Wide Bandwidth: 9 MHz
  • Low Supply Current: 5 mA
  • Low Offset Voltage: 1 mV
  • Low Offset Current: 2 nA
  • Unity Gain Stable
  • PDIP-8 Package


  • High Performance Audio
  • Active Filters
  • Fast Amplifiers
  • Integrators
Item ID:
Analog Devices Part Number:
Product Measurements by Type
Common Mode Rejection Ratio80 dB:
Gain Bandwidth Product9 MHz
Input Bias Current400 nA
Input Offset Voltage1 mV
Input TypeDifferential
Max. Operating Temperature+85 C:
Max. Supply Current5.5 mA at +/- 22V at -40C to 85C
Max. Supply Voltage22 V
Maximum Dual Supply Voltage+/- 22 V
Min. Operating Temperature-40 C
Min. Supply Voltage4.5 V
Minimum Dual Supply Voltage+/- 4.5 V
Number of Channels2 Channel
Operating Supply Current4 mA
Operating Supply Voltage4.5 V to 22 V
Power Supply Rejection Ratio111 dB
THD plus Noise0.0006 %
Type2-Channel Stereo
Packaging Information
Packaging Dimensions0.382 in. × 0.32 in. × 0.28 in.
Weight (Packaging)0.0027 lbs.
PDF: DatasheetAll Models

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PDF: Datasheet Datasheet282.34 KB

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