OPA627AP Texas Instruments OPA627AP Precision Operational Amplifier 8-PDIP Amplifiers

The Texas Instruments OPA627AP is a high-performance, FET-input operational amplifier (op-amp) designed for precision instrumentation, medical equipment, high-speed data acquisition, and audiophile-grade applications. Leveraging Difet? (dielectrically isolated FET) technology, this op-amp delivers ultra-low input bias currents (2pA max), exceptional noise performance (4.5nV/??Hz), and precision DC accuracy, making it ideal for ultra-sensitive signal conditioning.

With a slew rate of 55V/??s and a 16MHz gain bandwidth product (GBWP), the OPA627AP operates at ??4.5V to ??18V supply ranges, supporting high-speed, low-distortion applications. Packaged in an 8-pin PDIP (through-hole) format, this amplifier is unity-gain stable, ensuring stability in feedback-sensitive designs.

Key Features

✔ Ultra-Low Input Bias Current (2pA max) ?C Ideal for photodiode, electrometer, and high-Z sensor applications
✔ High Speed (55V/??s Slew Rate, 16MHz GBWP) ?C Accelerates precision signal acquisition
✔ Low Noise (4.5nV/??Hz @10kHz, 20nV/??Hz @1kHz) ?C Maximizes SNR in sensitive analog circuits
✔ Precision DC Performance:

• Low Input Offset Voltage (130??V max)
• Low Drift (0.8??V/??C max)??C Stable over?industrial temperature ranges (-25??C to +85??C)
  ✔?Wide Supply Range (??4.5V to ??18V)??C Supports???5V, ??12V, ??15V rails
  ✔?High Output Current (45mA)??C Drives?ADCs, DACs, and low-impedance loads efficiently
  ✔?Unity-Gain Stable (OPA627AP, vs. OPA637AP for gain ??5)??C Flexible for?buffering and filtering

Technical Specifications

Electrical Characteristics

Physical & Environmental

Applications

1. Precision Instrumentation

• Strain gauge amplifiers, thermocouples
• Medical sensors (ECG, EEG, EMG)
• High-impedance pH/chemical sensors

2. High-Speed Data Acquisition

• 16-bit+ ADC/DAC buffer amplifiers
• Ultrasound & sonar signal chains
• Radar/LIDAR analog front-ends

3. Optoelectronics & Sensors

• Photodiode transimpedance amplifiers (TIAs)
• Laser diode control loops
• Low-light CCD/CMOS sensor interfaces

4. High-End Audio & Pro Audio

• Phono preamplifiers (low-noise RIAA EQ)
• Microphone preamps (ultra-low THD+N)
• DAC output stages (for Hi-Res audio)

5. Industrial & Test Equipment

• ATE (Automated Test Equipment) front-ends
• Reference voltage buffers
• Active filter designs (Butterworth, Chebyshev, etc.)

Features

1. Difet? Isolation = Ultra-Low Bias Currents

Unlike conventional FET op-amps, the OPA627AP uses dielectrically isolated FET inputs (Difet?) to reduce input bias currents to femtoampere (fA) levels, eliminating leakage errors common in bipolar/JFET op-amps.

2. 55V/??s Slew Rate for Fast Signal Dynamics

The fast transient response (550ns to 0.01%) ensures minimal phase distortion in pulsed signals, crucial in ultrasound, radar, and high-speed data converters.

3. Low Noise Floor (4.5nV/??Hz @10kHz)

Superior noise performance makes it ideal for weak signal amplification (e.g., bio-sensors, geophones).

4. Unity-Gain Stability (OPA627AP Only)

Unlike the OPA637AP (min gain=5), the OPA627AP remains stable at unity gain, making it perfect for:

• Voltage followers
• I/V converters
• Sensor interface buffers

5. Industrial-Grade Temperature Stability

Low offset drift (0.8??V/??C) ensures precision in fluctuating environments.

OPA627AP vs. Alternatives