Part A
ADA4084-2ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3798 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Replacement verdict
Compatible functional replacement candidate
The ADA4077-2BRZ-RL is a viable functional replacement candidate for the ADA4084-2ARZ in precision, low-bandwidth signal conditioning applications, sharing the same dual op-amp configuration and SOIC-8 footprint. However, the ADA4084-2ARZ offers substantially higher gain bandwidth and slew rate, so the substitution requires validation where dynamic performance, output drive, or supply headroom are critical to the design.
Amplifier Configuration
High match
Package and Pinout
High match
Gain Bandwidth Product
Validation required
Supply Voltage Range
Validation required
Parts at a glance
Part B
ADA4077-2BRZ-RL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 9876 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
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 | ADA4077-2BRZ-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 designs. |
| Supply Voltage Range | 3 V to 30 V (±1.5 V to ±15 V) | 4 V to 30 V (±2 V to ±15 V) | The ADA4084-2ARZ operates down to 3 V, allowing use in lower-voltage systems where the ADA4077-2BRZ-RL (4 V minimum) would not function. |
| Input Offset Voltage (Max) | 75 µV | 25 µV | Lower offset voltage improves DC precision; the ADA4077-2BRZ-RL offers tighter offset for high-accuracy signal chains. |
| Input Bias Current (Typ) | 0.5 nA | 1 nA | Low bias current minimizes errors in high-impedance sensor and feedback networks; both are low but differ slightly. |
| Gain Bandwidth Product | 15.9 MHz | 3.6 MHz | GBW determines achievable closed-loop bandwidth; the ADA4084-2ARZ supports much wider bandwidth applications. |
| Slew Rate | 4.6 V/µs | 1.2 V/µs | Higher slew rate enables faster large-signal response; the ADA4084-2ARZ is better suited for higher-frequency, larger-swing signals. |
| Input Voltage Noise Density (1 kHz) | 3.9 nV/√Hz | 6.9 nV/√Hz | Lower voltage noise improves SNR in low-level signal amplification; the ADA4084-2ARZ is quieter. |
| Quiescent Current per Amplifier (Typ) | 0.625 mA | 0.4 mA | Lower quiescent current reduces power consumption; the ADA4077-2BRZ-RL is more power-efficient in battery-powered 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 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 | ADA4077-2BRZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| 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 | 10 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 primary differences between the ADA4084-2ARZ and the ADA4077-2BRZ-RL?
The ADA4084-2ARZ is a dual, low power, low noise, rail-to-rail input/output operational amplifier specified for a supply voltage range of 3 V to 30 V (or ±1.5 V to ±15 V). The ADA4077-2BRZ-RL is a dual, low noise, low offset voltage operational amplifier with rail-to-rail output and an input voltage range that includes the negative rail, specified for 4 V to 36 V (or ±2 V to ±18 V). The ADA4084-2ARZ offers rail-to-rail input and output swing, while the ADA4077-2BRZ-RL does not have rail-to-rail input capability.
Are the ADA4084-2ARZ and ADA4077-2BRZ-RL pin-compatible?
Both devices are offered in standard 8-lead SOIC packages. The ADA4084-2ARZ is in an 8-lead SOIC (R-8) package, and the ADA4077-2BRZ-RL is in an 8-lead SOIC (R-8) package. They share the same standard dual op-amp pinout, so they are pin-compatible when both are in the SOIC package.
How do the input voltage ranges of the ADA4084-2ARZ and ADA4077-2BRZ-RL compare?
The ADA4084-2ARZ features rail-to-rail input, meaning its input common-mode voltage range extends to both the positive and negative supply rails. The ADA4077-2BRZ-RL has an input voltage range that includes the negative rail but does not extend to the positive rail; its input common-mode range is specified from the negative supply to within approximately 1.5 V of the positive supply.
Which device has lower offset voltage, the ADA4084-2ARZ or the ADA4077-2BRZ-RL?
The ADA4077-2BRZ-RL has a lower maximum offset voltage. The ADA4077-2B grade is specified with a maximum input offset voltage of 25 µV, while the ADA4084-2ARZ is specified with a maximum input offset voltage of 100 µV. The ADA4077-2BRZ-RL is therefore better suited for precision DC applications requiring low offset.
How do the supply voltage ranges of the ADA4084-2ARZ and ADA4077-2BRZ-RL differ?
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 ADA4077-2BRZ-RL operates from a single supply of 4 V to 36 V or a dual supply of ±2 V to ±18 V. The ADA4084-2ARZ can operate at lower supply voltages, while the ADA4077-2BRZ-RL supports a higher maximum supply voltage.
Can the ADA4084-2ARZ and ADA4077-2BRZ-RL be used interchangeably in an existing design?
They should not be treated as drop-in replacements without validation. Although both are dual op-amps in 8-lead SOIC packages with the same pinout, they differ in input common-mode range, supply voltage range, offset voltage, and other AC/DC specifications. The ADA4084-2ARZ has rail-to-rail input, whereas the ADA4077-2BRZ-RL does not, so circuits relying on input signals near the positive rail may not function correctly with the ADA4077-2BRZ-RL. Review the datasheets and verify all parameters against the target design before substitution.
What are the package and ordering differences between the ADA4084-2ARZ and ADA4077-2BRZ-RL?
Both parts are available in 8-lead SOIC packages. The ADA4084-2ARZ suffix "ARZ" denotes an 8-lead SOIC package in tube or tray form, while the ADA4077-2BRZ-RL suffix "RL" denotes an 8-lead SOIC package supplied in tape-and-reel format. The "B" grade of the ADA4077-2BRZ-RL indicates a tighter offset voltage specification compared with the standard grade.