Part A
ADA4891-2ARMZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 6456 PCS
- Series
- 선형 증폭기 - 계측기, 연산 증폭기, 완충 증폭기
Replacement verdict
Compatible functional replacement candidate
The ADA4895-2ARMZ-RL is a higher-performance alternative to the ADA4891-2ARMZ, sharing the same dual-channel, 8-lead MSOP footprint and similar supply architecture, but it is not a direct drop-in substitute. The ADA4895-2 offers substantially higher bandwidth, slew rate, and output drive, which can alter loop stability and power dissipation in an existing ADA4891-2 design. Validation of the surrounding circuit, decoupling, and thermal budget is required before substitution.
Package and Pinout
High match
Supply Voltage Range
High match
Bandwidth and Slew Rate
Validation required
Output Drive and Power Dissipation
Validation required
Parts at a glance
Part B
ADA4895-2ARMZ-RL
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 9381 PCS
- Package
- MSOP-10
- Series
- 선형 증폭기 - 계측기, 연산 증폭기, 완충 증폭기
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADA4891-2ARMZ | ADA4895-2ARMZ-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. |
| -3dB Bandwidth | 240 MHz | 236 MHz | Bandwidth determines the maximum signal frequency the amplifier can handle with acceptable gain; similar values indicate comparable high-frequency capability. |
| Slew Rate | 170 V/µs | 105 V/µs | Slew rate limits how fast the output can change; a higher slew rate supports larger/faster signals without distortion. |
| Input Offset Voltage (Max) | 6 mV | 0.5 mV | Lower offset voltage improves DC accuracy; the ADA4895 offers significantly better precision for DC-coupled applications. |
| Input Voltage Noise Density | 9 nV/√Hz | 1 nV/√Hz | Lower voltage noise improves signal-to-noise ratio in low-level signal applications; the ADA4895 is substantially quieter. |
| Supply Voltage Range | 2.7 V to 5.5 V | 3 V to 10 V | The supply range must cover the system rail voltage; the ADA4895 supports higher supply voltages not available to the ADA4891. |
| Quiescent Current (per amplifier) | 4.4 mA | 3 mA | Quiescent current affects power consumption; the ADA4895 draws less current per amplifier, benefiting power-sensitive designs. |
| Output Current (Typical) | 125 mA | 80 mA | Output drive capability determines the load the amplifier can drive; the ADA4891 provides higher output current for heavier loads. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Identical 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 | ADA4891-2ARMZ | ADA4895-2ARMZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Amplifier Type | CMOS | Voltage Feedback |
| Number of Circuits | 2 | 2 |
| Output Type | Rail-to-Rail | Rail-to-Rail |
| Slew Rate | 210V/µs | 943V/µs |
| Gain Bandwidth Product | 105 MHz | 1.5 GHz |
| -3 dB Bandwidth | 90 MHz | 236 MHz |
| Current - Input Bias | 2 pA | 11 µA |
| Voltage - Input Offset | 2.5 mV | 53 µV |
| Supply Current | 4.4mA (x2 Channels) | 3mA (x2 Channels) |
| Current - Output / Channel | 125 mA | 116 mA |
| Voltage - Supply Span(Min) | 2.7 V | 3 V |
| Voltage - Supply Span(Max) | 5.5 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 primary differences between the ADA4891-2ARMZ and the ADA4895-2ARMZ-RL?
The ADA4891-2ARMZ is a dual, low-cost, high-speed voltage feedback amplifier optimized for low power consumption, while the ADA4895-2ARMZ-RL is a dual, high-speed, low-noise amplifier designed for higher bandwidth and precision applications. The ADA4891-2ARMZ operates on a single supply from 2.7 V to 5.5 V with a -3 dB bandwidth of 240 MHz, whereas the ADA4895-2ARMZ-RL operates from 3 V to 10 V with a -3 dB bandwidth of 1.5 GHz and lower input voltage noise.
Are the ADA4891-2ARMZ and ADA4895-2ARMZ-RL pin-compatible?
Yes, both devices are offered in an 8-lead MSOP (ARMZ) package and share the same pinout configuration, allowing for potential drop-in replacement on an existing PCB layout. However, designers must verify that the surrounding circuit components and supply voltages are compatible with the selected amplifier's specifications.
What are the supply voltage ranges for these two amplifiers?
The ADA4891-2ARMZ operates on a single supply voltage from 2.7 V to 5.5 V. The ADA4895-2ARMZ-RL operates on a wider supply range from 3 V to 10 V. The ADA4895-2ARMZ-RL is not specified for operation below 3 V, so it cannot directly replace the ADA4891-2ARMZ in 2.7 V systems.
How do the bandwidth and slew rate compare between the ADA4891-2ARMZ and ADA4895-2ARMZ-RL?
The ADA4891-2ARMZ provides a -3 dB bandwidth of 240 MHz and a slew rate of 170 V/µs. The ADA4895-2ARMZ-RL offers a significantly higher -3 dB bandwidth of 1.5 GHz and a slew rate of 380 V/µs, making it more suitable for high-speed signal processing applications.
Which device offers lower input voltage noise?
The ADA4895-2ARMZ-RL features a lower input voltage noise density of 1 nV/√Hz at 100 kHz, compared to 4.5 nV/√Hz at 1 MHz for the ADA4891-2ARMZ. This makes the ADA4895-2ARMZ-RL preferable for low-noise, precision signal chain designs.
What are the quiescent current differences between the ADA4891-2ARMZ and ADA4895-2ARMZ-RL?
The ADA4891-2ARMZ has a low quiescent current of 4.4 mA per amplifier, making it suitable for power-sensitive applications. The ADA4895-2ARMZ-RL draws a higher quiescent current of 6.5 mA per amplifier, reflecting its higher bandwidth and lower noise performance.
Can the ADA4891-2ARMZ and ADA4895-2ARMZ-RL be used in single-supply and dual-supply configurations?
Both amplifiers support single-supply and dual-supply operation within their respective voltage ranges. The ADA4891-2ARMZ operates from 2.7 V to 5.5 V single supply or ±1.35 V to ±2.75 V dual supply. The ADA4895-2ARMZ-RL operates from 3 V to 10 V single supply or ±1.5 V to ±5 V dual supply.
What are the operating temperature ranges for these two components?
Both the ADA4891-2ARMZ and the ADA4895-2ARMZ-RL are specified for operation over the industrial temperature range of -40°C to +125°C, making them suitable for harsh-environment applications.