Part A
ADA4077-1ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5601 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 ADA4077-1ARZ is a single-channel precision operational amplifier, while the ADA4084-2ARZ is a dual-channel device; they share the same SOIC-8 package and similar supply voltage range, but differ in channel count and bandwidth, so substitution requires validation of channel requirements and AC performance.
Channel Count
Validation required
Package Type
High match
Supply Voltage Range
Validation required
Gain Bandwidth Product
Not compatible
Parts at a glance
Part B
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
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 | ADA4077-1ARZ | Why it matters |
|---|---|---|---|
| Number of Amplifiers | 2 (Dual) | 1 (Single) | Channel count determines package pinout and PCB layout; a dual cannot directly replace a single without layout changes. |
| 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 lower minimum supply of the ADA4084-2ARZ allows operation in 3 V systems where the ADA4077-1ARZ cannot be used. |
| Input Offset Voltage (Max) | 75 µV | 25 µV | Lower offset voltage improves DC precision; the ADA4077-1ARZ offers tighter offset for high-accuracy signal chains. |
| Input Bias Current (Typ) | 140 nA | 0.5 nA | Much lower bias current in the ADA4077-1ARZ 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 enables larger full-power bandwidth and better handling of fast transients. |
| 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 in the ADA4077-1ARZ benefits power-sensitive, battery-operated designs. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Identical industrial temperature range means both parts suit the same environmental conditions. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Same package footprint aids board-level compatibility, though pin functions differ between single and dual 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 | ADA4077-1ARZ | ADA4084-2ARZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | General Purpose | General Purpose |
| Number of Circuits | 1 | 2 |
| Slew Rate | 1.2V/µs | 4.6V/µs |
| Gain Bandwidth Product | 3.6 MHz | 15.9 MHz |
| Current - Input Bias | 400 pA | 140 nA |
| Voltage - Input Offset | 15 µV | 30 µV |
| Supply Current | 400µA | 625µA (x2 Channels) |
| Current - Output / Channel | 22 mA | 30 mA |
| Voltage - Supply Span(Min) | 5 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 |
| Output Type | - | Rail-to-Rail |
| -3 dB Bandwidth | - | 13.9 MHz |
Frequently asked questions
What are the key differences between the ADA4084-2ARZ and ADA4077-1ARZ?
The ADA4084-2ARZ is a dual, low-power, low-noise operational amplifier with rail-to-rail input and output, specified for supply voltages from ±1.5 V to ±18 V (3 V to 36 V total). The ADA4077-1ARZ is a single, high-precision, low-noise op amp with rail-to-rail output (not rail-to-rail input) and is specified for ±2.5 V to ±15 V (5 V to 30 V total) supplies. The ADA4084-2ARZ offers two amplifiers per package with rail-to-rail input, while the ADA4077-1ARZ offers one amplifier with superior offset voltage and drift specifications.
Can the ADA4084-2ARZ and ADA4077-1ARZ be used interchangeably in an existing design?
No, they are not drop-in replacements. The ADA4084-2ARZ is a dual op amp in an 8-lead SOIC package, while the ADA4077-1ARZ is a single op amp in an 8-lead SOIC package with a different pinout. Additionally, the ADA4084-2ARZ supports rail-to-rail input and a wider supply range, whereas the ADA4077-1ARZ does not have rail-to-rail input. Circuit topology, pin assignments, and supply requirements must be revalidated before any substitution.
How do the input offset voltage specifications compare between the ADA4084-2ARZ and ADA4077-1ARZ?
The ADA4077-1ARZ is a higher-precision amplifier with a maximum input offset voltage of 25 µV (typical 15 µV) at 25°C, and offset voltage drift of 0.25 µV/°C maximum. The ADA4084-2ARZ has a maximum input offset voltage of 200 µV (typical 50 µV) at 25°C. For applications requiring tight DC precision, the ADA4077-1ARZ is the more suitable choice based on published datasheet limits.
What are the supply voltage ranges for the ADA4084-2ARZ and ADA4077-1ARZ?
The ADA4084-2ARZ operates from a total supply voltage of 3 V to 36 V (±1.5 V to ±18 V). The ADA4077-1ARZ operates from a total supply voltage of 5 V to 30 V (±2.5 V to ±15 V). Designs operating at supplies below 5 V total can use the ADA4084-2ARZ but not the ADA4077-1ARZ.
How do the noise characteristics of the ADA4084-2ARZ and ADA4077-1ARZ compare?
Both devices are low-noise amplifiers. The ADA4084-2ARZ specifies a voltage noise density of 3.9 nV/√Hz at 1 kHz. The ADA4077-1ARZ specifies a voltage noise density of 6.9 nV/√Hz at 1 kHz. For lowest voltage noise at 1 kHz, the ADA4084-2ARZ has the lower published figure, while the ADA4077-1ARZ offers lower offset voltage and drift for precision DC applications.
Do the ADA4084-2ARZ and ADA4077-1ARZ support rail-to-rail input and output?
The ADA4084-2ARZ features rail-to-rail input and rail-to-rail output, allowing its input common-mode range to extend to both supply rails. The ADA4077-1ARZ features rail-to-rail output but its input common-mode range does not extend to the positive supply rail; its input range is specified from the negative supply to within approximately 1.5 V of the positive supply. This difference is critical for buffer and instrumentation front-end designs.
What are the package and pin count differences between the ADA4084-2ARZ and ADA4077-1ARZ?
Both devices are offered in 8-lead SOIC packages (the "ARZ" suffix denotes SOIC, RoHS-compliant). The ADA4084-2ARZ is a dual op amp using all 8 pins for two amplifiers plus supply pins. The ADA4077-1ARZ is a single op amp in an 8-lead SOIC package with a different pinout that includes offset null or other dedicated pins. PCB layouts are therefore not interchangeable between the two part numbers.
Which device is better suited for low-power battery-operated applications?
Both are low-power devices, but the published supply current differs. The ADA4084-2ARZ specifies a typical supply current of 0.625 mA per amplifier (1.25 mA total for the dual). The ADA4077-1ARZ specifies a typical supply current of 0.9 mA for the single amplifier. For a single-channel function, the ADA4077-1ARZ draws less total current; for dual-channel functions, the ADA4084-2ARZ provides two amplifiers at a lower per-amplifier current. Selection depends on channel count and the required precision versus input range.