Part A
ADA4084-2ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3798 PCS
- Package
- SOIC-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The ADA4001-2ARZ-RL is a functional replacement candidate for the ADA4084-2ARZ in dual op-amp applications where lower bandwidth and reduced supply voltage range are acceptable. Both devices share the same SOIC-8 package and dual-channel configuration, but the ADA4084-2ARZ offers wider bandwidth, higher slew rate, and a broader supply range, so the ADA4001-2ARZ-RL should be validated against the application's AC performance and supply requirements before substitution.
Bandwidth and Slew Rate
Validation required
Supply Voltage Range
Validation required
Package Type
High match
Channel Count
High match
Parts at a glance
Part B
ADA4001-2ARZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6269 PCS
- Package
- SOIC-8
- 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 | ADA4084-2ARZ | ADA4001-2ARZ-RL | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count is compatible for drop-in use in dual-channel circuits. |
| Supply Voltage Range | 3 V to 30 V (single) / ±1.5 V to ±15 V (dual) | 4 V to 36 V (single) / ±2 V to ±18 V (dual) | The usable supply window differs; a circuit designed near the lower rail of one part may not operate correctly with the other. |
| Input Offset Voltage (max) | 75 µV | 150 µV | Lower offset improves DC accuracy; substituting a higher-offset part can degrade precision in sensor and instrumentation front-ends. |
| Input Bias Current (typ) | 0.15 µA | 0.5 µA | Bias current affects error in high-impedance circuits; a larger bias current can introduce additional offset error. |
| Gain Bandwidth Product | 15.9 MHz | 10 MHz | GBW determines achievable closed-loop bandwidth; a lower-GBW substitute may not meet the speed requirements of the original design. |
| Slew Rate | 4.6 V/µs | 3.5 V/µs | Slew rate limits large-signal response; a slower part can cause distortion or reduced settling in fast transient applications. |
| Input Voltage Noise Density (1 kHz) | 3.9 nV/√Hz | 10 nV/√Hz | Lower noise density is critical for low-level signal amplification; a noisier substitute can reduce overall SNR. |
| Quiescent Current per Amplifier (typ) | 0.625 mA | 1.0 mA | Supply current impacts power budget; a higher-current substitute may exceed power constraints in portable or low-power designs. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | The narrower temperature range of the substitute may not satisfy industrial or automotive thermal requirements. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Matching package and pinout allows direct board-level replacement without layout changes. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADA4084-2ARZ | ADA4001-2ARZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Amplifier Type | General Purpose | J-FET |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 4.6V/µs | 25V/µs |
| Gain Bandwidth Product | 15.9 MHz | 16.7 MHz |
| -3 dB Bandwidth | 13.9 MHz | 10.3 MHz |
| Current - Input Bias | 140 nA | 20 pA |
| Voltage - Input Offset | 30 µV | 500 µV |
| Supply Current | 625µA (x2 Channels) | 2mA (x2 Channels) |
| Current - Output / Channel | 30 mA | 50 mA |
| Voltage - Supply Span(Min) | 3 V | 10 V |
| Voltage - Supply Span(Max) | 30 V | 36 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADA4084-2ARZ and the ADA4001-2ARZ-RL?
The ADA4084-2ARZ is a dual, low noise, rail-to-rail input/output operational amplifier from Analog Devices specified for 10 MHz gain bandwidth and 4.5 nV/√Hz voltage noise, while the ADA4001-2ARZ-RL is a dual, low noise, low input bias current JFET-input op amp with 10 MHz gain bandwidth and 6 nV/√Hz voltage noise. The ADA4084-2 uses a bipolar input stage with rail-to-rail input/output swing, whereas the ADA4001-2 uses a JFET input stage with rail-to-rail output and typically much lower input bias current.
Are the ADA4084-2ARZ and ADA4001-2ARZ-RL pin-compatible in the SOIC-8 package?
Both devices are offered in an 8-lead SOIC package with the standard dual op amp pinout (1=OUT A, 2=-IN A, 3=+IN A, 4=V-, 5=+IN B, 6=-IN B, 7=OUT B, 8=V+). The ARZ suffix indicates the SOIC-8 package for both parts, so they share the same pin configuration and footprint, but electrical differences must still be validated before substitution.
How do the input bias currents of the ADA4084-2ARZ and ADA4001-2ARZ-RL compare?
The ADA4001-2ARZ-RL uses a JFET input stage and is specified with very low input bias current, typically in the picoampere range, making it suitable for high-impedance sensor interfaces. The ADA4084-2ARZ uses a bipolar input stage and has input bias current in the nanoampere to microampere range depending on temperature, so it is less suited to very high source impedance applications.
Which device is better suited for low-noise audio or precision signal conditioning?
Both parts are low-noise amplifiers. The ADA4084-2ARZ specifies 4.5 nV/√Hz input voltage noise with 10 MHz gain bandwidth, while the ADA4001-2ARZ-RL specifies approximately 6 nV/√Hz with 10 MHz gain bandwidth. For lowest voltage noise with bipolar inputs, the ADA4084-2 is preferable; for lowest input bias current with JFET inputs, the ADA4001-2 is preferable. Selection should be based on source impedance and noise requirements verified in the respective datasheets.
What are the supply voltage ranges for the ADA4084-2ARZ and ADA4001-2ARZ-RL?
The ADA4084-2ARZ operates from a single supply of 3 V to 30 V or a dual supply of ±1.5 V to ±15 V. The ADA4001-2ARZ-RL operates from a single supply of 5 V to 36 V or a dual supply of ±2.5 V to ±18 V. Designs operating at very low single-supply voltages below 5 V should use the ADA4084-2, while higher supply voltage headroom favors the ADA4001-2.
Do both amplifiers support rail-to-rail input and output operation?
The ADA4084-2ARZ features rail-to-rail input and rail-to-rail output, allowing signal swing close to both supply rails. The ADA4001-2ARZ-RL features rail-to-rail output but its JFET input stage has a limited input common-mode voltage range that does not extend fully to the positive rail. This difference is critical when the input signal approaches the supply rails.
Can the ADA4001-2ARZ-RL directly replace the ADA4084-2ARZ in an existing design?
Direct replacement is not guaranteed. Although both are dual op amps in an 8-lead SOIC package with the same pinout, they differ in input stage type, input bias current, input common-mode range, and supply voltage range. The replacement must be validated against the ADA4001-2 datasheet for the specific circuit's source impedance, input signal range, and supply voltages before substitution.
What does the RL suffix on the ADA4001-2ARZ-RL indicate?
The RL suffix on the ADA4001-2ARZ-RL denotes tape-and-reel packaging for automated assembly, while ARZ denotes the 8-lead SOIC package with the standard industrial temperature grade. The ADA4084-2ARZ is supplied in tube or tray packaging unless a reel suffix is specified, so packaging format differs between the two part numbers even though the package type is the same.