AD8643ACPZ-REEL7 - Quad Precision JFET Op Amp | Analog Devices
MPN: AD8643ACPZ-REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.17 | $11.17 |
| 10 | $10.05 | $100.50 |
| 100 | $8.94 | $894.00 |
| 500 | $7.82 | $3,910.00 |
| 1,000 | $6.71 | $6,710.00 |
AD8643ACPZ-REEL7 Overview
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output. It is a fundamental building block in analog signal processing, used in applications such as filtering, amplification, and signal conditioning. Op amps are categorized by input type (e.g., JFET, CMOS, bipolar), output stage (e.g., rail-to-rail), and performance metrics like noise, offset voltage, and bandwidth. The AD8643 belongs to the precision JFET input family, offering high input impedance and low input bias current, making it suitable for interfacing with high-impedance sensors and photodiodes.
Key features include a maximum input offset voltage of 750µV, a low input bias current of 1pA, and rail-to-rail output swing. The device is fully specified over the extended industrial temperature range of -40°C to +125°C, ensuring reliable operation in harsh environments. The low power consumption makes it ideal for battery-powered and portable applications.
The AD8643 utilizes a JFET input stage, which provides very high input impedance and low input bias current, minimizing loading on signal sources. The rail-to-rail output stage allows maximum dynamic range, particularly in single-supply applications. The amplifier is stable with capacitive loads up to 100pF, and its low distortion and noise make it suitable for precision signal conditioning.
Typical applications include photodiode amplifiers, ATE reference level drivers, battery management systems, and industrial controls. The ability to swing nearly rail-to-rail at the output enables designers to buffer CMOS DACs, ASICs, and other wide output swing devices. The quad configuration provides four independent amplifiers in a single package, saving board space and cost.
When designing with the AD8643, ensure proper power supply decoupling with 0.1µF ceramic capacitors placed 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. The output can drive loads down to 2kΩ, but for heavier loads, consider using a buffer stage.
Drop-in alternatives for AD8643ACPZ-REEL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesAD8643ACPZ-REEL7 Maximum Ratings & Electrical Characteristics
| Amplifier Type | J-FET |
| Number of Circuits | 4 |
| Output Type | Rail-to-Rail |
| Slew Rate | 2 V/µs |
| Gain Bandwidth Product | 2.5 MHz |
| Current - Input Bias | 1 pA |
| Voltage - Input Offset | 750 µV |
| Current - Supply | 250 µA (x4 channels) |
| Voltage - Supply Span (Min) | 5 V |
| Voltage - Supply Span (Max) | 26 V |
| Operating Temperature | -40°C to +125°C |
| Package / Case | 16-LFCSP-WQ (3x3) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lifecycle Status | Production |
AD8643ACPZ-REEL7 Pin Configuration
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | -IN A — Inverting input of amplifier A |
| Pin 3 | +IN A — Non-inverting input of amplifier A |
| Pin 4 | V+ — Positive supply |
| Pin 5 | +IN B — Non-inverting input of amplifier B |
| Pin 6 | -IN B — Inverting input of amplifier B |
| Pin 7 | OUT B — Output of amplifier B |
| Pin 8 | OUT C — Output of amplifier C |
| Pin 9 | -IN C — Inverting input of amplifier C |
| Pin 10 | +IN C — Non-inverting input of amplifier C |
| Pin 11 | V- — Negative supply |
| Pin 12 | +IN D — Non-inverting input of amplifier D |
| Pin 13 | -IN D — Inverting input of amplifier D |
| Pin 14 | OUT D — Output of amplifier D |
| Pin 15 | EP — Exposed pad, connect to V- |
| Pin 16 | NC — No connect |
Typical Applications
AD8643ACPZ-REEL7 is suitable for 6 applications: Photodiode Amplifier, ATE Reference Level Driver, Battery Management, Industrial Controls, CMOS DAC Buffer, Portable Instrumentation.
Photodiode Amplifier
The AD8643ACPZ-REEL7's 1 pA input bias current and 2.5 MHz bandwidth make it ideal for photodiode transimpedance amplifiers. The low bias current minimizes dark current errors, and the rail-to-rail output allows maximum dynamic range for light detection. In a typical circuit, the photodiode is connected between the inverting input and ground, with a feedback resistor setting the gain. The JFET input ensures negligible loading on the photodiode, preserving signal integrity. For high-speed applications, a feedback capacitor may be added to optimize stability.
Recommended
ATE Reference Level Driver
In automatic test equipment (ATE), the AD8643ACPZ-REEL7 drives reference levels with high accuracy and low offset. Its 750 µV max offset voltage and rail-to-rail output ensure precise voltage levels for device under test (DUT) stimulation. The quad configuration provides four independent drivers in one package, saving board space. The wide supply range accommodates various test voltages, and the low power consumption reduces thermal effects in dense ATE boards. The JFET input minimizes loading on reference sources, maintaining accuracy.
Recommended
Battery Management
The AD8643ACPZ-REEL7 is used in battery management systems for voltage and current sensing. Its low power consumption (250 µA per channel) is critical for extending battery life in portable devices. The rail-to-rail output allows full-scale measurement of battery voltage, and the wide supply range accommodates varying battery voltages. The JFET input ensures minimal current draw from the battery being monitored. The quad configuration enables monitoring of multiple cells or parameters simultaneously, reducing component count.
Recommended
Industrial Controls
In industrial control systems, the AD8643ACPZ-REEL7 provides precision signal conditioning for sensors and actuators. Its extended temperature range (-40°C to +125°C) ensures reliable operation in harsh environments. The low offset voltage and drift maintain accuracy over temperature, while the rail-to-rail output interfaces directly with ADCs and microcontrollers. The quad configuration allows multiple control loops in a single package, reducing board space and cost. The JFET input is ideal for high-impedance sensors like piezoelectric transducers.
Recommended
CMOS DAC Buffer
The AD8643ACPZ-REEL7 buffers the output of CMOS DACs, providing rail-to-rail swing and high input impedance. Its low bias current prevents loading of the DAC output, preserving accuracy. The 2.5 MHz bandwidth is sufficient for most DAC update rates, and the low distortion ensures signal fidelity. The quad configuration allows buffering of multiple DAC channels, making it ideal for multi-channel systems. The wide supply range accommodates various DAC supply voltages.
Recommended
Portable Instrumentation
The AD8643ACPZ-REEL7 is well-suited for portable instrumentation due to its low power consumption and small package. The 16-lead LFCSP (3x3 mm) saves board space, and the 250 µA per channel supply current extends battery life. The rail-to-rail output maximizes dynamic range in battery-powered systems, and the JFET input provides high input impedance for sensor interfaces. The quad configuration allows multiple signal conditioning channels in a compact footprint, ideal for handheld meters and data loggers.
Recommended
Recommended Products Summary
Engineering reference data for AD8643ACPZ-REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8643ARZ-REEL7 | AD8642ARZ-REEL7 | AD8641ARZ-REEL7 | OPA4192IDR | ADA4610-4ARZ |
|---|---|---|---|---|---|---|
| Package | 16-LFCSP-WQ (3x3) | 14-SOIC | 8-SOIC | 8-SOIC | 14-SOIC | 14-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Number of Channels | 4 | 4 | 2 | 1 | 4 | 4 |
| Input Bias Current | 1 pA | 1 pA | 1 pA | 1 pA | 5 pA | 1 pA |
| Gain Bandwidth Product | 2.5 MHz | 2.5 MHz | 2.5 MHz | 2.5 MHz | 10 MHz | 16.3 MHz |
| Slew Rate | 2 V/µs | 2 V/µs | 2 V/µs | 2 V/µs | 20 V/µs | 61 V/µs |
| Supply Voltage Range | 5V to 26V | 5V to 26V | 5V to 26V | 5V to 26V | 4.5V to 36V | ±5V to ±15V |
| Input Offset Voltage (Max) | 750 µV | 750 µV | 750 µV | 750 µV | 100 µV | 400 µV |
Key Differentiators
- Ultra-low input bias current of 1 pA (vs OPA4192IDR)
- Quad configuration in compact LFCSP package (vs AD8642ARZ-REEL7)
- Wide supply range and rail-to-rail output (vs ADA4610-4ARZ)
Design Notes
Ensure proper power supply decoupling by placing 0.1µF ceramic capacitors close to the V+ and V- pins. For best performance, use a 10µF tantalum capacitor in parallel for low-frequency decoupling. The AD8643 operates from 5V to 26V single supply or ±2.5V to ±13V dual supply; verify the supply voltage does not exceed the absolute maximum ratings.
The 16-lead LFCSP (3x3 mm) package has an exposed pad that should be soldered to a ground plane for thermal management. Use thermal vias to improve heat dissipation. Keep traces to the inputs short to minimize parasitic capacitance, which can cause instability. Follow the layout guidelines in the AD8643 datasheet for optimal performance.
Avoid exceeding the input common-mode voltage range, which extends from the negative rail to V+ - 1.2V. The output can swing rail-to-rail, but driving loads below 2kΩ may degrade performance. For capacitive loads greater than 100pF, add a series resistor to isolate the output. Also, ensure the input bias current path is provided; otherwise, the output may saturate.
Compliance Information
RoHS compliant per Mouser product listing. Other compliance data not specified in provided sources.
