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 ADA4084-2ARZ and ADA4077-2ARZ-RL share the same dual op-amp architecture and SOIC-8 footprint, making the ADA4077-2ARZ-RL a viable functional replacement candidate for the ADA4084-2ARZ in many precision signal-conditioning designs. However, the two devices differ in supply voltage range, quiescent current, and gain-bandwidth product, so the replacement should be validated against the target application's power budget and dynamic performance requirements before adoption.
Package Type
High match
Channel Count
High match
Supply Voltage Range
Validation required
Gain-Bandwidth Product
Validation required
Parts at a glance
Part B
ADA4077-2ARZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8573 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 | ADA4077-2ARZ-RL | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 | 2 | Both are dual op-amps, so channel count is compatible for direct substitution in dual-channel circuits. |
| Supply Voltage Range | 3 V to 30 V (single) / ±1.5 V to ±15 V (dual) | 4 V to 30 V (single) / ±2 V to ±15 V (dual) | The ADA4084-2ARZ operates down to 3 V single supply, allowing use in lower-voltage systems where the ADA4077-2ARZ-RL requires at least 4 V. |
| Input Offset Voltage (Max) | 75 µV | 25 µV | Lower offset voltage improves DC precision; the ADA4077-2ARZ-RL offers tighter offset for high-accuracy signal chains. |
| Input Bias Current (Typ) | 140 nA | 0.5 nA | Much lower bias current in the ADA4077-2ARZ-RL reduces errors in high-impedance sensor and feedback networks. |
| Gain Bandwidth Product | 15.9 MHz | 3.6 MHz | Higher GBW in the ADA4084-2ARZ supports wider signal bandwidth and faster closed-loop response. |
| Slew Rate | 4.6 V/µs | 1.2 V/µs | Faster slew rate in the ADA4084-2ARZ enables larger-signal handling at higher frequencies without distortion. |
| Input Voltage Noise Density (1 kHz) | 3.9 nV/√Hz | 6.9 nV/√Hz | Lower voltage noise in the ADA4084-2ARZ benefits low-level signal amplification and improves SNR. |
| Quiescent Current per Amplifier (Typ) | 0.625 mA | 0.4 mA | Lower quiescent current in the ADA4077-2ARZ-RL reduces power consumption in battery-powered and portable designs. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical industrial temperature range ensures both parts are suitable for the same environmental conditions. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package and pinout allow drop-in PCB compatibility between the two devices. |
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 | ADA4077-2ARZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 2 | 2 |
| Slew Rate | 4.6V/µs | 1.2V/µs |
| Gain Bandwidth Product | 15.9 MHz | 3.6 MHz |
| -3 dB Bandwidth | 13.9 MHz | 5.5 MHz |
| Current - Input Bias | 140 nA | 400 pA |
| Voltage - Input Offset | 30 µV | 15 µV |
| Supply Current | 625µA (x2 Channels) | 400µA (x2 Channels) |
| Current - Output / Channel | 30 mA | 10 mA |
| Voltage - Supply Span(Min) | 3 V | 5 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 | - |
Frequently asked questions
What are the key differences between the ADA4084-2ARZ and ADA4077-2ARZ-RL?
The ADA4084-2ARZ is a dual, low-power, low-noise operational amplifier with rail-to-rail input and output, specified for a supply voltage range of 3 V to 30 V (or ±1.5 V to ±15 V). The ADA4077-2ARZ-RL is a dual, low-noise, precision operational amplifier with rail-to-rail output (input common-mode range does not include the positive rail) and is specified for 4 V to 36 V (or ±2 V to ±18 V) supplies. The ADA4084-2 offers wider input common-mode range and lower minimum supply voltage, while the ADA4077-2 targets higher precision (lower offset voltage and drift) in applications with higher supply headroom.
Are the ADA4084-2ARZ and ADA4077-2ARZ-RL pin-compatible in the same package?
Both devices are offered in an 8-lead SOIC package (the "ARZ" suffix denotes SOIC-8). The ADA4084-2ARZ and ADA4077-2ARZ-RL share the standard dual op-amp SOIC-8 pinout (1=OUT A, 2=IN A−, 3=IN A+, 4=V−, 5=IN B+, 6=IN B−, 7=OUT B, 8=V+). Pin functions are therefore compatible, but electrical differences must be validated before substitution.
Which device has lower input offset voltage and drift?
The ADA4077-2ARZ-RL is the higher-precision device, with a typical input offset voltage of 25 µV (maximum 100 µV for the A grade) and low offset voltage drift, making it suitable for precision signal conditioning. The ADA4084-2ARZ has a larger typical offset voltage (on the order of hundreds of µV) and is optimized for low-power, low-noise, rail-to-rail operation rather than precision DC accuracy.
How do the supply voltage ranges compare?
The ADA4084-2ARZ operates from 3 V to 30 V total supply (or ±1.5 V to ±15 V), while the ADA4077-2ARZ-RL operates from 4 V to 36 V total supply (or ±2 V to ±18 V). Designs running at 3 V or ±1.5 V can use the ADA4084-2 but not the ADA4077-2; designs requiring supplies above 30 V must use the ADA4077-2.
How do the input common-mode ranges differ?
The ADA4084-2ARZ features rail-to-rail input, meaning its input common-mode voltage range extends to both supply rails, which is advantageous for low-voltage single-supply designs. The ADA4077-2ARZ-RL has an input common-mode range that includes the negative rail but not the positive rail, so its usable input range is more restricted near V+. Both devices have rail-to-rail outputs.
Which device is better suited for low-power portable designs?
The ADA4084-2ARZ is the better fit for low-power portable designs because it operates from a lower minimum supply (3 V) and is specified for low quiescent current per amplifier (on the order of hundreds of µA), supporting battery-powered and single-supply systems. The ADA4077-2ARZ-RL draws more supply current per amplifier and requires a higher minimum supply, making it less optimal for strict low-power portable use.
Can the ADA4077-2ARZ-RL directly replace the ADA4084-2ARZ in an existing design?
Not without validation. Although both are dual op-amps in an 8-lead SOIC with the same pinout, the ADA4077-2ARZ-RL has a higher minimum supply voltage (4 V vs 3 V), a more limited input common-mode range (does not include V+), and different offset, noise, and bandwidth characteristics. A direct drop-in replacement is only acceptable after confirming the design's supply voltage, input signal range, and AC/DC performance requirements against the ADA4077-2 datasheet.
What are the packaging and ordering differences between the two part numbers?
Both parts use the "ARZ" suffix indicating an 8-lead SOIC package in a RoHS-compliant version. The ADA4084-2ARZ is typically supplied in standard tube or tray quantities, while the ADA4077-2ARZ-RL suffix denotes tape-and-reel packaging for automated assembly. The "-RL" designation affects only the shipping format, not the device's electrical specifications.