1 Features
• Very low noise: 4.5nV/√Hz at 10kHz
• Fast settling time:
– OPA627: 550ns to 0.01%
– OPA637: 450ns to 0.01%
• Low VOS: 100μV maximum
• Low drift: 0.8μV/°C maximum
• Low IB: 5pA maximum
• Gain options:
– OPA627: Unity-gain stable
– OPA637: Stable in gain ≥ 5

2 Applications
• Precision instrumentation
• Fast data acquisition
• DAC output amplifier
• Optoelectronics
• Sonar, ultrasound
• High-impedance sensor amps
• High-performance audio circuitry
• Active filters

3 Description
The OPA627 and OPA637 (OPA6x7) operational
amplifiers (op amps) provide a new level of
performance in a precision FET operational amplifier.
When compared to the popular OPA111 op amp, the
OPA6x7 have lower noise, lower offset voltage, and
higher speed. The OPA6x7 are useful in a broad
range of precision and high-speed analog circuitry.
The OPA6x7 is fabricated on a high-speed,
dielectrically-isolated, complementary NPN/PNP
process. The OPA6x7 operate over a wide powersupply
voltage range of ±4.5V to ±18V. Laser-trimmed
input circuitry provides high accuracy and low-noise
performance comparable with the best bipolar-input
op amps.
High-frequency complementary transistors allow
increased circuit bandwidth, attaining dynamic
performance not possible with previous precision FET
op amps. The OPA627 is unity-gain stable. The
OPA637 is stable in gains ≥ 5.
State-of-the-art, precision FET transistors achieve
extremely low input bias currents without
compromising input voltage noise performance. Low
input bias current is maintained over a wide input
common-mode voltage range with unique cascode
circuitry.
The OPA6x7 are available in SOIC-8 and TO-99
packages. Industrial temperature range models are
available.