Part A
ADA4530-1ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3596 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Not a drop-in replacement
The ADA4522-4ARZ and ADA4530-1ARZ are not drop-in replacements for one another. The ADA4522-4ARZ is a quad-channel, 55 V, low-noise, zero-drift operational amplifier, while the ADA4530-1ARZ is a single-channel, 16 V, femtoampere-input-bias electrometer amplifier. Their channel count, supply voltage range, input bias current, and package footprint differ fundamentally, so the ADA4530-1ARZ cannot directly substitute the ADA4522-4ARZ in an existing design without schematic, layout, and application-level redesign.
Different channel count
Different supply voltage range
Different input bias current class
Different package footprint
Parts at a glance
Part B
ADA4522-4ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6486 PCS
- Package
- SOIC-14
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADA4522-4ARZ | ADA4530-1ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 4 | 1 | Determines how many independent signal channels can be processed in a single package; a quad device suits multi-channel designs while a single device suits one-channel precision front ends. |
| Input Offset Voltage (Max) | 5 µV | 20 µV | Lower offset voltage reduces DC error at the amplifier input, which is critical for precision sensor and instrumentation signal chains. |
| Input Bias Current (Typ) | 50 pA | 1 fA | Ultra-low bias current minimizes error in high-impedance sources such as photodiodes and pH/electrometer sensors; the femtoampere-class part is essential for such applications. |
| Input Voltage Noise Density (Typ) | 5.8 nV/√Hz | 14 nV/√Hz | Lower voltage noise improves resolution of small signals; the lower-noise part is preferable for wideband precision amplification. |
| Gain Bandwidth Product | 2.7 MHz | 2 MHz | Sets the closed-loop bandwidth achievable at a given gain; affects speed of the signal chain and stability of the feedback network. |
| Supply Voltage Range | 4.5 V to 55 V | 4.5 V to 16 V | Defines compatibility with the system power rail; the wider-range device can operate directly from high-voltage industrial supplies. |
| Quiescent Current per Amplifier (Typ) | 830 µA | 1.5 mA | Affects total power budget and thermal load, especially important in portable or densely packed multi-channel boards. |
| Operating Temperature Range | -40 °C to 125 °C | -40 °C to 125 °C | Confirms both parts are rated for industrial temperature environments, so thermal derating requirements are equivalent. |
| Package | 14-Lead SOIC | 8-Lead SOIC | Footprint and pin count must match the PCB layout; a direct drop-in substitution is not possible without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADA4530-1ARZ | ADA4522-4ARZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | General Purpose | Zero-Drift |
| Number of Circuits | 1 | 4 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 1.4V/µs | 1.7V/µs |
| Gain Bandwidth Product | 2 MHz | 2.7 MHz |
| -3 dB Bandwidth | 5.5 MHz | 6.5 MHz |
| Current - Input Bias | 0.02 pA | 50 pA |
| Voltage - Input Offset | 8 µV | 1.5 µV |
| Supply Current | 900µA | 830µA (x4 Channels) |
| Current - Output / Channel | 15 mA | 32 mA |
| Voltage - Supply Span(Min) | 4.5 V | 4.5 V |
| Voltage - Supply Span(Max) | 16 V | 55 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the ADA4522-4ARZ and the ADA4530-1ARZ?
The ADA4522-4ARZ is a quad, zero-drift, 55 V operational amplifier with a typical offset voltage of 5 µV and a gain-bandwidth product of 2.7 MHz. The ADA4530-1ARZ is a single, femtoampere-input-bias electrometer-grade amplifier with a maximum input bias current of 20 fA and a gain-bandwidth product of 2 MHz. The ADA4522-4ARZ is optimized for high-voltage, low-offset signal conditioning, while the ADA4530-1ARZ is optimized for ultra-low input bias current applications such as photodiode and electrometer front ends.
Can the ADA4522-4ARZ and ADA4530-1ARZ be used interchangeably in the same socket?
No. The ADA4522-4ARZ is a quad amplifier in a 14-lead SOIC package, while the ADA4530-1ARZ is a single amplifier in an 8-lead SOIC package. The pin counts, pin functions, and package footprints differ, so they are not pin-compatible and cannot be directly substituted in the same PCB land pattern.
How do the input bias currents of the ADA4522-4ARZ and ADA4530-1ARZ compare?
The ADA4522-4ARZ has a typical input bias current of 50 pA and a maximum of 150 pA at 25°C. The ADA4530-1ARZ has a maximum input bias current of 20 fA at 25°C, which is several orders of magnitude lower. The ADA4530-1ARZ is therefore preferred for applications requiring femtoampere-level input bias current, such as electrometer and photodiode circuits.
What are the supply voltage ranges for the ADA4522-4ARZ and ADA4530-1ARZ?
The ADA4522-4ARZ operates from a single supply of 4.5 V to 55 V or a dual supply of ±2.25 V to ±27.5 V. The ADA4530-1ARZ operates from a single supply of 4.5 V to 16 V or a dual supply of ±2.25 V to ±8 V. The ADA4522-4ARZ supports higher supply voltages, making it suitable for high-voltage industrial and instrumentation applications.
Which device is better suited for low-noise precision signal conditioning?
The ADA4522-4ARZ is a zero-drift amplifier with a typical input voltage noise density of 5.6 nV/√Hz at 1 kHz and a typical 0.1 Hz to 10 Hz voltage noise of 0.12 µV p-p. The ADA4530-1ARZ has a typical input voltage noise density of 14 nV/√Hz at 1 kHz. For low-noise precision signal conditioning where voltage noise is the dominant concern, the ADA4522-4ARZ provides lower voltage noise, while the ADA4530-1ARZ is optimized for ultra-low input bias current rather than minimum voltage noise.
What are the offset voltage specifications of the ADA4522-4ARZ and ADA4530-1ARZ?
The ADA4522-4ARZ has a typical offset voltage of 5 µV and a maximum offset voltage of 22 µV at 25°C, with a typical offset voltage drift of 22 nV/°C. The ADA4530-1ARZ has a typical offset voltage of 10 µV and a maximum offset voltage of 50 µV at 25°C, with a typical offset voltage drift of 50 nV/°C. The ADA4522-4ARZ offers tighter offset voltage and lower drift specifications.
Are the ADA4522-4ARZ and ADA4530-1ARZ both zero-drift amplifiers?
Yes. The ADA4522-4ARZ is a zero-drift operational amplifier using auto-zeroing and chopping techniques to achieve low offset voltage and offset voltage drift. The ADA4530-1ARZ is also a zero-drift amplifier, but its primary differentiation is its femtoampere-level input bias current rather than high-voltage operation or quad channel density.
Which device should be selected for photodiode or electrometer front-end applications?
The ADA4530-1ARZ is the appropriate choice for photodiode and electrometer front-end applications because its maximum input bias current of 20 fA minimizes error in high-impedance sensor interfaces. The ADA4522-4ARZ, with input bias current in the picoampere range, is not intended for femtoampere-level electrometer applications but is better suited to high-voltage, low-offset, multi-channel signal conditioning.