OP42AZ - High Speed Precision JFET Op Amp | Analog Devices
料号： OP42AZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 |
OP42AZ 概述
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, used to perform mathematical operations like addition, subtraction, integration, and filtering in analog circuits. The OP42AZ belongs to the class of precision JFET-input op amps, which combine low offset voltage and drift with very low input bias current, ideal for high-impedance sources. In the hierarchy of analog ICs, it sits under linear amplifiers, which are fundamental building blocks in signal processing chains.
Key features of the OP42AZ include a gain-bandwidth product of 10MHz, a fast settling time of 1.2µs to 0.01%, and a low input bias current of 100pA. The device also offers a wide full-power bandwidth of 900kHz and operates with a supply current of less than 6mA, balancing speed with power efficiency. Its precision specifications, such as low offset voltage and low noise, make it suitable for demanding applications.
Technically, the OP42AZ uses a JFET input stage to achieve high input impedance and low bias current, while a bipolar output stage provides high output drive capability. The amplifier is internally compensated, simplifying design by eliminating external compensation components. The symmetric slew rate ensures equal positive and negative signal handling, reducing distortion in high-speed waveforms.
Typical applications include fast settling sample-and-hold circuits, high-speed integrators, active filters, and precision instrumentation amplifiers. The OP42AZ is also used in audio and video signal processing where high slew rate and low distortion are critical. Its 8-pin CERDIP package provides hermetic sealing for enhanced reliability in harsh environments.
When designing with the OP42AZ, ensure proper power supply decoupling with 0.1µF ceramic capacitors close to the supply pins. The input common-mode range extends to the negative rail, but for best performance, keep inputs within the specified common-mode voltage range. Also, consider the thermal characteristics of the CERDIP package, which has a higher thermal resistance than plastic packages, and provide adequate heat sinking if power dissipation is significant.
直接替换替代料： OP42AZ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
OP42GPZ
✅ 直接替换📋 参考替代料（不在目录中）
OP42FZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
OP42GZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD845KN
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
OP42AZ 最大额定值与电气特性
| 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 |
| 电源电流 | 5.2 mA (max) |
| Output Current | ±30 mA |
| 封装 | 8-CERDIP |
| 工作温度范围 | -40°C to +85°C |
| RoHS 状态 | Compliant |
| 安装类型 | Through Hole |
OP42AZ 引脚配置
| 引脚 1 | OFFSET N1 — Offset null input 1 |
| 引脚 2 | IN- — Inverting input |
| 引脚 3 | IN+ — Non-inverting input |
| 引脚 4 | V- — Negative supply |
| 引脚 5 | OFFSET N2 — Offset null input 2 |
| 引脚 6 | OUT — Output |
| 引脚 7 | V+ — Positive supply |
| 引脚 8 | NC — No connection |
典型应用
OP42AZ 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： OP42AZ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Hermetic ceramic package for harsh environments （对比 OP42GPZ)
- Lower input bias current than AD845 （对比 AD845KN)
- Lower supply current than AD845 （对比 AD845KN)
设计说明
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.
合规信息
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified as it is not an automotive-grade part.
