Part A
ADA4084-2ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3798 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Not a drop-in replacement
The ADA4084-2ARZ and ADA4004-4ARZ-RL are not drop-in replacements for each other. The ADA4084-2ARZ is a dual-channel, rail-to-rail input/output operational amplifier in an 8-lead SOIC package, while the ADA4004-4ARZ-RL is a quad-channel, precision low-noise operational amplifier in a 14-lead SOIC package. The differing channel count, package footprint, supply voltage range, and output swing characteristics require circuit redesign and PCB layout changes before substitution can be considered.
Different channel count
Different package footprint
Different supply voltage range
Different output swing
Parts at a glance
Part B
ADA4004-4ARZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8634 Stückzahl
- Package
- SOIC-14
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
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 | ADA4004-4ARZ-RL | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 4 | Determines how many independent op-amp channels are available in a single package, directly affecting circuit density and channel count. |
| Supply Voltage Range | 3 V to 30 V (single) / ±1.5 V to ±15 V (dual) | ±4.5 V to ±15 V (dual) | Defines the operating voltage window; the ADA4084 supports lower single-supply operation, enabling battery-powered or low-voltage designs the ADA4004 cannot. |
| Input Offset Voltage (max) | 75 µV | 100 µV | Lower offset voltage improves DC precision and reduces output error in high-gain or precision signal-conditioning applications. |
| Input Voltage Noise Density | 3.9 nV/√Hz | 1.8 nV/√Hz | Lower noise density benefits low-level signal amplification; the ADA4004 offers superior noise performance for sensitive front-ends. |
| Gain Bandwidth Product | 15.9 MHz | 12 MHz | Sets the achievable closed-loop bandwidth and speed; higher GBW supports faster signal processing and wider-bandwidth filters. |
| Slew Rate | 4.6 V/µs | 2.7 V/µs | Determines large-signal transient response; higher slew rate reduces distortion for fast, large-amplitude signals. |
| Supply Current per Amplifier (typ) | 0.625 mA | 1.7 mA | Affects power budget and thermal load; lower per-amplifier current favors power-sensitive designs. |
| Input Bias Current (typ) | 140 nA | 40 nA | Lower bias current reduces errors in high-impedance source circuits and precision integrators. |
| Package | 8-Lead SOIC | 14-Lead SOIC | Footprint and pin count differ, so PCB layout and board space must be redesigned when substituting between these parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADA4084-2ARZ | ADA4004-4ARZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | - | iPolar® |
| Part Status | Active | Active |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 2 | 4 |
| Slew Rate | 4.6V/µs | 2.7V/µs |
| Gain Bandwidth Product | 15.9 MHz | 12 MHz |
| Current - Input Bias | 140 nA | 40 nA |
| Voltage - Input Offset | 30 µV | 40 µV |
| Current - Output / Channel | 30 mA | 10 mA |
| Voltage - Supply Span(Min) | 3 V | 10 V |
| Voltage - Supply Span(Max) | 30 V | 30 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Output Type | Rail-to-Rail | - |
| -3 dB Bandwidth | 13.9 MHz | - |
| Supply Current | 625µA (x2 Channels) | - |
Frequently asked questions
What are the key differences between the ADA4084-2ARZ and the ADA4004-4ARZ-RL?
The ADA4084-2ARZ is a dual-channel, 10 MHz, low-noise, rail-to-rail input/output operational amplifier in an 8-lead SOIC package. The ADA4004-4ARZ-RL is a quad-channel, 1.8 MHz, low-noise, low-power operational amplifier in a 14-lead SOIC package supplied in tape-and-reel format. They differ in channel count, bandwidth, package pin count, and packaging format.
Can the ADA4084-2ARZ be used as a direct drop-in replacement for the ADA4004-4ARZ-RL?
No. The ADA4084-2ARZ is a dual op amp in an 8-lead SOIC package, while the ADA4004-4ARZ-RL is a quad op amp in a 14-lead SOIC package. The pin counts, pin functions, and PCB land patterns differ, so a direct drop-in substitution is not possible without a board redesign.
How do the bandwidth specifications of the ADA4084-2ARZ and ADA4004-4ARZ-RL compare?
The ADA4084-2ARZ has a gain bandwidth product of 10 MHz, while the ADA4004-4ARZ-RL has a gain bandwidth product of 1.8 MHz. The ADA4084-2ARZ therefore offers substantially higher bandwidth for applications requiring wider signal frequency range.
What are the supply voltage ranges for the ADA4084-2ARZ and ADA4004-4ARZ-RL?
Both devices operate from a single supply of 3 V to 30 V or a dual supply of ±1.5 V to ±15 V. This wide supply range makes both parts suitable for battery-powered and industrial signal-conditioning applications.
How do the input voltage noise densities of the ADA4084-2ARZ and ADA4004-4ARZ-RL compare?
The ADA4084-2ARZ has a voltage noise density of approximately 3.9 nV/√Hz at 1 kHz, while the ADA4004-4ARZ-RL has a voltage noise density of approximately 6 nV/√Hz at 1 kHz. The ADA4084-2ARZ provides lower input voltage noise for noise-sensitive designs.
What are the quiescent current specifications for the ADA4084-2ARZ and ADA4004-4ARZ-RL?
The ADA4084-2ARZ draws approximately 1.6 mA per amplifier of quiescent current, while the ADA4004-4ARZ-RL draws approximately 0.9 mA per amplifier. The ADA4004-4ARZ-RL offers lower per-amplifier supply current, which is advantageous in low-power, multi-channel designs.
Do both the ADA4084-2ARZ and ADA4004-4ARZ-RL support rail-to-rail input and output operation?
Yes. Both the ADA4084-2ARZ and the ADA4004-4ARZ-RL feature rail-to-rail input and output swing, allowing signals to approach both supply rails and maximizing dynamic range in low-voltage systems.
In what package and packaging format is the ADA4004-4ARZ-RL supplied compared with the ADA4084-2ARZ?
The ADA4004-4ARZ-RL is supplied in a 14-lead SOIC package in tape-and-reel format (RL designation), suitable for automated assembly. The ADA4084-2ARZ is supplied in an 8-lead SOIC package in tube format. The package type and pin count differ, so PCB footprint compatibility must be verified.