Part A
ADA4805-2ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1854 PCS
- Package
- MSOP-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The ADA4805-2ARMZ and ADA4897-2ARMZ-RL are both dual low-power, low-noise, rail-to-rail output operational amplifiers in the same 8-lead MSOP (ARMZ) package, making the ADA4897-2ARMZ-RL a viable functional replacement candidate for the ADA4805-2ARMZ in many designs. However, the two devices differ in supply voltage range, quiescent current, and bandwidth, so the replacement should be validated against the target application's power budget, signal bandwidth, and supply rail requirements before adoption.
Package Type
High match
Channel Count
High match
Supply Voltage Range
Validation required
Quiescent Current
Validation required
Parts at a glance
Part B
ADA4897-2ARMZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4605 PCS
- Package
- MSOP-10
- 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 | ADA4805-2ARMZ | ADA4897-2ARMZ-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. |
| -3 dB Bandwidth | 105 MHz | 230 MHz | Bandwidth determines the maximum signal frequency the amplifier can handle with acceptable gain; the ADA4897-2 offers roughly twice the bandwidth. |
| Slew Rate | 160 V/µs | 120 V/µs | Slew rate limits how fast the output can respond to large signal steps; the ADA4805-2 is faster here, affecting large-signal transient performance. |
| Input Voltage Noise Density | 5.5 nV/√Hz | 1 nV/√Hz | Lower input noise improves signal-to-noise ratio in precision and low-level signal applications; the ADA4897-2 is significantly quieter. |
| Supply Current per Amplifier | 500 µA | 3 mA | Quiescent current drives power consumption; the ADA4805-2 is a low-power part while the ADA4897-2 draws considerably more for higher performance. |
| Input Offset Voltage | 125 µV (max) | 0.5 mV (max) | Offset voltage affects DC accuracy; the ADA4805-2 offers tighter offset, which matters for precision DC-coupled designs. |
| Supply Voltage Range | 3 V to 10 V | 3 V to 10 V | Both support the same single-supply range, so power supply compatibility is maintained for substitution. |
| Package / Mounting | 8-Lead MSOP (Surface Mount) | 8-Lead MSOP (Surface Mount) | Identical package and footprint allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Matching industrial temperature ranges ensure both parts are suitable for the same environmental conditions. |
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 | ADA4805-2ARMZ | ADA4897-2ARMZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Amplifier Type | Voltage Feedback | Voltage Feedback |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 250V/µs | 120V/µs |
| Gain Bandwidth Product | - | 90 MHz |
| -3 dB Bandwidth | 120 MHz | 230 MHz |
| Current - Input Bias | 550 nA | 4 µA |
| Voltage - Input Offset | 13 µV | 28 µV |
| Supply Current | 570µA (x2 Channels) | 3mA (x2 Channels) |
| Current - Output / Channel | 73 mA | 80 mA |
| Voltage - Supply Span(Min) | 2.7 V | 3 V |
| Voltage - Supply Span(Max) | 10 V | 10 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADA4805-2ARMZ and ADA4897-2ARMZ-RL?
The ADA4805-2ARMZ is a dual, low-power, low-noise, rail-to-rail output amplifier with a 105 MHz gain bandwidth product and 160 V/µs slew rate, typically drawing 500 µA per amplifier. The ADA4897-2ARMZ-RL is a dual, low-power, low-noise, rail-to-rail output amplifier with a 230 MHz gain bandwidth product and 120 V/µs slew rate, typically drawing 3 mA per amplifier. The ADA4897-2 offers higher bandwidth and higher quiescent current, while the ADA4805-2 targets lower power consumption.
Are the ADA4805-2ARMZ and ADA4897-2ARMZ-RL pin-compatible?
Both devices are offered in 8-lead MSOP (ARMZ) packages with the same standard dual op-amp pinout, so they are pin-compatible when both are supplied in the MSOP package. Designers should still verify the land pattern and package drawing in the respective datasheets before layout.
Which device has lower quiescent current, the ADA4805-2 or the ADA4897-2?
The ADA4805-2ARMZ has a lower typical quiescent current of approximately 500 µA per amplifier, whereas the ADA4897-2ARMZ-RL typically draws about 3 mA per amplifier. The ADA4805-2 is therefore better suited to power-sensitive designs.
Which device offers higher bandwidth and slew rate?
The ADA4897-2ARMZ-RL provides a higher gain bandwidth product of 230 MHz and a slew rate of 120 V/µs, compared with 105 MHz and 160 V/µs for the ADA4805-2ARMZ. The ADA4897-2 is preferable when higher bandwidth is required, while the ADA4805-2 offers a higher slew rate.
What is the difference in input voltage noise between these two amplifiers?
The ADA4805-2ARMZ specifies a low input voltage noise density of approximately 5.5 nV/√Hz, while the ADA4897-2ARMZ-RL specifies approximately 1 nV/√Hz. The ADA4897-2 provides lower voltage noise, making it more suitable for low-noise signal-chain applications.
Can the ADA4805-2ARMZ and ADA4897-2ARMZ-RL operate from the same supply voltages?
Both devices support a wide supply range. The ADA4805-2ARMZ operates from a single supply of 3 V to 10 V (or ±1.5 V to ±5 V dual supply), and the ADA4897-2ARMZ-RL operates from a single supply of 3 V to 10 V (or ±1.5 V to ±5 V dual supply). They can therefore be used in the same supply-voltage systems, subject to verifying the exact datasheet limits.
Which device is better for low-power portable applications?
The ADA4805-2ARMZ is generally better for low-power portable applications because its typical quiescent current of about 500 µA per amplifier is significantly lower than the approximately 3 mA per amplifier of the ADA4897-2ARMZ-RL. The trade-off is lower bandwidth and higher input voltage noise.
Are both devices specified for rail-to-rail output operation?
Yes. Both the ADA4805-2ARMZ and the ADA4897-2ARMZ-RL are rail-to-rail output amplifiers, allowing the output swing to approach the supply rails. Designers should consult the respective datasheets for the exact output swing specifications under their load and supply conditions.