OP42AZ - High Speed Precision JFET Op Amp | Analog Devices
MPN: OP42AZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.58 | $75.80 |
| 100 | $6.74 | $674.00 |
| 500 | $5.9 | $2,950.00 |
| 1,000 | $5.06 | $5,060.00 |
Drop-in alternatives for OP42AZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
OP42GPZ
✅ Drop-In📋 Reference alternative (not in catalog)
OP42FZ
✅ Drop-In📋 Reference alternative (not in catalog)
OP42GZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD845KN
✅ Drop-In📋 Reference alternative (not in catalog)
OP42AZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | J-FET |
| Number of Circuits | 1 |
| Slew Rate | 58 V/µs |
| Gain Bandwidth Product | 10 MHz |
| Supply Voltage Range | ±4.5 V to ±18 V |
| Input Bias Current | 100 pA |
| Input Offset Voltage | 0.4 mV (max) |
| Settling Time | 1.2 µs to 0.01% |
| Full Power Bandwidth | 900 kHz |
| Supply Current | 5.2 mA (max) |
| Output Current | ±30 mA |
| Package | 8-CERDIP |
| Operating Temperature Range | -40°C to +85°C |
| RoHS Status | Compliant |
| Mounting Type | Through Hole |
OP42AZ Pin Configuration
| Pin 1 | OFFSET N1 — Offset null input 1 |
| Pin 2 | IN- — Inverting input |
| Pin 3 | IN+ — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | OFFSET N2 — Offset null input 2 |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply |
| Pin 8 | NC — No connection |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
OP42AZ is suitable for 6 applications: Sample-and-Hold Circuits, Active Filters, Precision Instrumentation, Audio Signal Processing, Video Signal Conditioning, Data Acquisition Systems.
Sample-and-Hold Circuits
The OP42AZ's fast settling time of 1.2µs to 0.01% and high slew rate of 58V/µs make it ideal for sample-and-hold circuits in data acquisition systems. It accurately captures fast analog signals and holds them for ADC conversion, ensuring minimal droop and high precision. The JFET input provides high impedance, preventing loading of the source. In a typical circuit, the OP42AZ buffers the hold capacitor, and its low bias current minimizes voltage error during the hold phase. This application is critical in high-speed instrumentation and communication systems where signal integrity is paramount.
Recommended
Active Filters
With a gain bandwidth product of 10MHz, the OP42AZ is well-suited for active filters in the audio and video frequency range. Its high slew rate ensures low distortion in high-frequency signals, while the JFET input allows for high-impedance filter networks without loading. The amplifier's unity-gain stability simplifies filter design, enabling Butterworth, Chebyshev, or Bessel responses. In a multiple-feedback low-pass filter, the OP42AZ provides precise gain and phase characteristics, making it ideal for anti-aliasing filters in ADC front-ends and reconstruction filters in DAC outputs.
Recommended
Precision Instrumentation
The OP42AZ's low input offset voltage (0.4mV max) and low input bias current (100pA) make it suitable for precision instrumentation amplifiers. It can be used in bridge amplifiers, thermocouple conditioners, and photodiode amplifiers where accuracy is critical. The high common-mode rejection and power supply rejection ensure stable performance in noisy industrial environments. In a typical instrumentation amplifier configuration, the OP42AZ provides the high gain and accuracy needed for precise sensor measurements, with its fast settling time enabling high-speed data logging.
Recommended
Audio Signal Processing
The OP42AZ's high slew rate and low distortion make it an excellent choice for audio signal processing, including equalizers, crossovers, and preamplifiers. Its wide bandwidth of 10MHz ensures transparent reproduction of audio frequencies, while the JFET input provides high input impedance for passive volume controls and pickups. The symmetric slew rate reduces harmonic distortion, preserving audio fidelity. In a phono preamp, the OP42AZ can amplify low-level signals from a cartridge with minimal added noise, and its fast settling time ensures accurate transient response.
Recommended
Video Signal Conditioning
With a full power bandwidth of 900kHz and a slew rate of 58V/µs, the OP42AZ can handle composite video signals (up to 6MHz) with minimal distortion. It is suitable for video buffering, clamping, and filtering applications in CCTV, broadcast, and medical imaging systems. The high output current (±30mA) allows driving coaxial cables directly, while the JFET input minimizes loading of video sources. In a video distribution amplifier, the OP42AZ provides the necessary gain and bandwidth to maintain signal integrity over long cable runs.
Recommended
Data Acquisition Systems
The OP42AZ is ideal for data acquisition systems requiring high-speed signal conditioning. Its fast settling time and low noise ensure accurate conversion by ADCs, while the high input impedance prevents loading of sensors. The wide supply voltage range allows operation in both 5V and ±15V systems. In a multi-channel DAQ, the OP42AZ can be used as a programmable gain amplifier or buffer before the ADC, providing the necessary drive capability and precision. Its low power consumption (5.2mA) is beneficial in portable or multi-channel systems.
Recommended
Recommended Products Summary
Engineering reference data for OP42AZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OP42GPZ | OP42FZ | OP42GZ | OP42GSZ | AD845KN |
|---|---|---|---|---|---|---|
| Package | 8-CERDIP | 8-PDIP | 8-CERDIP | 8-CERDIP | 8-SOIC | 8-PDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Slew Rate | 58 V/µs | 58 V/µs | 58 V/µs | 58 V/µs | 58 V/µs | 100 V/µs |
| Gain Bandwidth Product | 10 MHz | 10 MHz | 10 MHz | 10 MHz | 10 MHz | 16 MHz |
| Input Bias Current | 100 pA | 100 pA | 100 pA | 100 pA | 100 pA | 500 pA |
| Supply Voltage Range | ±4.5V to ±18V | ±4.5V to ±18V | ±4.5V to ±18V | ±4.5V to ±18V | ±4.5V to ±18V | ±4.5V to ±18V |
| Settling Time | 1.2 µs to 0.01% | 1.2 µs to 0.01% | 1.2 µs to 0.01% | 1.2 µs to 0.01% | 1.2 µs to 0.01% | 0.5 µs to 0.01% |
| Supply Current | 5.2 mA max | 5.2 mA max | 5.2 mA max | 5.2 mA max | 5.2 mA max | 10 mA max |
Key Differentiators
- Hermetic ceramic package for harsh environments (vs OP42GPZ)
- Lower input bias current than AD845 (vs AD845KN)
- Lower supply current than AD845 (vs AD845KN)
Design Notes
Ensure proper power supply decoupling with 0.1µF ceramic capacitors placed as close as possible to the V+ and V- pins. For high-frequency applications, add a 10µF tantalum capacitor in parallel to maintain low impedance at the supply rails. This is critical to prevent oscillation and maintain the OP42AZ's high PSRR.
For the 8-pin CERDIP package, use a PCB layout with a ground plane to minimize parasitic inductance and capacitance. Keep input traces short and shielded to reduce noise pickup. The offset null pins (1 and 5) can be used with a potentiometer to trim offset voltage, but ensure the wiper is connected to V- to avoid degrading CMRR.
The CERDIP package has a higher thermal resistance (typically 100°C/W) compared to plastic DIP. If the OP42AZ is driving heavy loads (e.g., ±30mA) at high supply voltages, power dissipation can be significant. Calculate junction temperature using Tj = Ta + (Pd * θja) and ensure it stays below 150°C. For high-power applications, consider using a socket with airflow or a heatsink.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified as it is not an automotive-grade part.
