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AD8643ARZ-REEL
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Product Detailed Parameters
- Description：IC OPAMP JFET 4 CIRCUIT 14SOIC
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Amplifier Type：J-FET
- Number of Circuits：4
- Output Type：Rail-to-Rail
- Slew Rate：3V/µs
- Gain Bandwidth Product：3.5 MHz
- Current - Input Bias：0.25 pA
- Voltage - Input Offset：70 µV
- Current - Supply：200µA (x4 Channels)
- Current - Output / Channel：12 mA
- Voltage - Supply Span (Min)：5 V
- Voltage - Supply Span (Max)：26 V
- Operating Temperature：-40°C ~ 125°C
- Grade：-
- Qualification：-
- Mounting Type：Surface Mount
- Package / Case：14-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：14-SOIC
- -3db Bandwidth：-
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Overview
The AD8643ARZ-REEL is a quad precision JFET operational amplifier featuring rail-to-rail output capability. It operates on single supplies from 5 V to 26 V or dual supplies of ±2.5 V to ±13 V. Key electrical specifications include a maximum input bias current of 1 pA, an offset voltage of 750 µV max, and a gain-bandwidth product of 3.5 MHz at ±13 V. The device draws a supply current of 250 µA per amplifier and maintains stability with capacitive loads exceeding 500 pF.
Feature Summary
- Extremely low input bias current characteristic of JFET technology
- Rail-to-rail output swing capability for wide dynamic range
- Unity-gain stable without phase reversal issues
- Capable of driving capacitive loads greater than 500 pF
Applications
- Photodiode amplifiers
- Precision current sensing
- Line- or battery-powered instruments
- Medical instrumentation
- Industrial controls
Procurement Notes
Verify the package type matches the specific suffix; ARZ indicates a 14-lead SOIC package, while other variants may use LFCSP. Confirm RoHS compliance status as indicated by the Z suffix. Ensure the reel quantity aligns with production requirements. Check datasheet revision F for updated thermal resistance values and pin configurations before finalizing procurement.
Selection Notes
Select this component when low power consumption and high DC precision are required in multi-channel designs. The JFET input stage is suitable for high-impedance signal sources. Verify that the 14-lead SOIC package fits the board layout constraints compared to the available LFCSP option. Consider the 250 µA quiescent current per channel for total system power budgeting.
Part Context
This part belongs to the AD8641/AD8642/AD8643 family of low-power, precision amplifiers. The AD8643 specifically integrates four independent amplifiers within a single package. The family shares common characteristics such as rail-to-rail outputs and JFET inputs, differing primarily in channel count and physical package options like SC70, MSOP, SOIC, and LFCSP.
Replacement Considerations
Direct substitutes within the same family include AD8641 (single) and AD8642 (dual). For quad configurations, verify if AD8643ACPZ variants are acceptable if LFCSP packaging is permissible instead of the SOIC form factor.
