Part A
ADA4004-2ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3179 PCS
- Package
- MSOP-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The ADA4084-2ARMZ-RL is a viable functional replacement candidate for the ADA4004-2ARMZ in many dual op-amp applications, sharing the same MSOP-8 package and dual-channel topology, though the ADA4004-2ARMZ offers lower voltage noise and tighter offset voltage while the ADA4084-2ARMZ-RL provides wider bandwidth and higher slew rate. Designers should validate noise-sensitive and precision DC signal chains before substituting.
Package Type
High match
Channel Count
High match
Input Voltage Noise
Validation required
Gain Bandwidth Product
Validation required
Parts at a glance
Part B
ADA4084-2ARMZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8960 PCS
- Package
- TSSOP-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 | ADA4004-2ARMZ | ADA4084-2ARMZ-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. |
| Input Offset Voltage (Max) | 100 µV | 75 µV | Lower offset reduces DC error; the ADA4084 offers tighter offset, which can improve precision in DC-coupled signal chains. |
| Input Bias Current (Typ) | 90 nA | 140 nA | Bias current affects error in high-impedance sources; the ADA4004 has lower bias current, favoring high-impedance sensor interfaces. |
| Gain Bandwidth Product | 12 MHz | 15 MHz | GBW sets achievable closed-loop bandwidth; the ADA4084 provides more bandwidth for faster signal processing. |
| Slew Rate | 2.7 V/µs | 4.6 V/µs | Higher slew rate supports larger/faster output swings without distortion; the ADA4084 handles faster transients. |
| Supply Voltage Range | ±5 V to ±15 V (dual) | ±1.5 V to ±15 V (dual) | The ADA4084 operates at lower supply voltages, enabling use in low-voltage systems where the ADA4004 cannot run. |
| Input Voltage Noise Density (1 kHz) | 10 nV/√Hz | 3.9 nV/√Hz | Lower noise improves SNR in low-level signal amplification; the ADA4084 is notably quieter for precision sensing. |
| Quiescent Current per Amplifier (Typ) | 1.7 mA | 0.625 mA | Lower quiescent current reduces power consumption; the ADA4084 is better suited for power-sensitive designs. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Identical package and pinout allow direct PCB footprint compatibility between the two parts. |
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 | ADA4004-2ARMZ | ADA4084-2ARMZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 2 | 2 |
| Output Type | - | Rail-to-Rail |
| Slew Rate | 2.7V/µs | 4.6V/µs |
| Gain Bandwidth Product | 12 MHz | 15.9 MHz |
| -3 dB Bandwidth | - | 13.9 MHz |
| Current - Input Bias | 40 nA | 140 nA |
| Voltage - Input Offset | 40 µV | 60 µV |
| Supply Current | - | 625µA (x2 Channels) |
| Current - Output / Channel | 10 mA | 30 mA |
| Voltage - Supply Span(Min) | 10 V | 3 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 |
| Series | iPolar® | - |
Frequently asked questions
What are the key differences between the ADA4004-2ARMZ and the ADA4084-2ARMZ-RL?
The ADA4004-2ARMZ is a dual precision operational amplifier with very low voltage noise (1.8 nV/√Hz typical) and low offset voltage, optimized for precision signal conditioning. The ADA4084-2ARMZ-RL is a dual low power, low noise operational amplifier featuring rail-to-rail input and output, a 10 MHz gain bandwidth product, and a 4.5 nV/√Hz typical voltage noise, supplied in a tape-and-reel format. The ADA4004-2 is tailored for high DC precision, while the ADA4084-2 targets wider bandwidth and rail-to-rail swing at lower supply current.
Are the ADA4004-2ARMZ and ADA4084-2ARMZ-RL pin-compatible in the same package?
Both devices are offered in an 8-lead MSOP (RM) package. Pinout compatibility should be confirmed against the respective manufacturer datasheets before substitution, since pin functions and internal compensation may differ between the two amplifier families.
What is the supply voltage range for each device?
The ADA4004-2 operates from a dual supply of ±5 V to ±15 V (10 V to 30 V total). The ADA4084-2 operates from a single supply of 3 V to 36 V or a dual supply of ±1.5 V to ±18 V. Designs should verify the chosen supply against the datasheet limits of the specific part.
How do the input voltage noise specifications compare?
The ADA4004-2 specifies a typical input voltage noise density of 1.8 nV/√Hz, making it suitable for low noise precision applications. The ADA4084-2 specifies a typical input voltage noise density of 4.5 nV/√Hz. The ADA4004-2 therefore offers lower voltage noise, while the ADA4084-2 provides wider bandwidth and rail-to-rail I/O.
What are the gain bandwidth and slew rate differences?
The ADA4084-2 has a gain bandwidth product of 10 MHz and a slew rate of 4.6 V/µs. The ADA4004-2 has a lower gain bandwidth product and slew rate, consistent with its precision, lower bandwidth design. The ADA4084-2 is preferable when higher frequency signal handling is required.
Does the ADA4084-2ARMZ-RL support rail-to-rail input and output?
Yes. The ADA4084-2 features rail-to-rail input and output swing, which allows it to operate with input and output signals close to both supply rails. The ADA4004-2 does not provide rail-to-rail input/output capability, so headroom requirements differ between the two parts.
What does the -RL suffix indicate on the ADA4084-2ARMZ-RL?
The -RL suffix denotes tape-and-reel packaging, which is intended for automated high-volume assembly. The ADA4004-2ARMZ is supplied in standard tube or tray packaging unless a reel option is separately specified. Both parts share the same 8-lead MSOP body when the RM package code is used.
Can the ADA4084-2ARMZ-RL directly replace the ADA4004-2ARMZ in an existing design?
Direct replacement is not guaranteed. Although both are dual op amps in an 8-lead MSOP package, differences in supply range, input/output swing, noise, bandwidth, and offset specifications mean the substitution must be validated against the ADA4084-2 datasheet and the target circuit requirements before use.