Part A
ADA4891-2ARMZ
ADI公司
- Lifecycle
- Active
- Stock
- 6456 件
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Replacement verdict
Compatible functional replacement candidate
The ADA4891-2ARMZ can serve as a functional replacement candidate for the ADA4896-2ARMZ in many applications, since both are dual high-speed voltage-feedback op amps in the same 8-lead MSOP package with identical pinout. However, the ADA4891-2ARMZ offers lower bandwidth, lower slew rate, and higher input offset voltage, so designs requiring the ADA4896-2ARMZ's higher speed and precision should validate AC and DC performance before substitution.
Package Type
High match
Channel Count
High match
Bandwidth and Slew Rate
Validation required
Input Offset Voltage
Validation required
Parts at a glance
Part B
ADA4896-2ARMZ
ADI公司
- Lifecycle
- Active
- Stock
- 5675 件
- Series
- 線性放大器-儀器、運算放大器、緩衝放大器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADA4896-2ARMZ | ADA4891-2ARMZ | Why it matters |
|---|---|---|---|
| -3 dB Bandwidth | 230 MHz | 220 MHz | Bandwidth determines the maximum signal frequency the amplifier can handle with acceptable gain; a higher value supports faster signal processing. |
| Slew Rate | 120 V/µs | 170 V/µs | Slew rate limits how fast the output can change; it affects large-signal handling and distortion at high frequencies. |
| Input Voltage Noise Density | 1 nV/√Hz | 6 nV/√Hz | Lower input noise improves signal-to-noise ratio in precision and low-level signal applications. |
| Supply Voltage Range | 3 V to 10 V | 2.7 V to 5.5 V | The supply range determines compatibility with the system power rail; a wider range offers more flexibility in different designs. |
| Quiescent Current (per amplifier) | 3 mA | 4.4 mA | Quiescent current affects power consumption, which is critical in battery-powered and power-sensitive designs. |
| Input Offset Voltage (max) | 0.5 mV | 6 mV | Lower offset voltage reduces DC error, improving accuracy in precision signal conditioning. |
| Gain Bandwidth Product | 90 MHz | 105 MHz | GBP indicates the achievable closed-loop bandwidth at a given gain, guiding selection for high-gain stages. |
| Output Current (short-circuit) | 80 mA | 125 mA | Higher output drive capability supports driving heavier loads such as cables or low-impedance stages. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range defines the environments in which the part can reliably operate. |
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 | ADA4896-2ARMZ |
|---|---|---|
| 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 | 120V/µs |
| Gain Bandwidth Product | 105 MHz | 90 MHz |
| -3 dB Bandwidth | 90 MHz | 230 MHz |
| Current - Input Bias | 2 pA | 4 µA |
| Voltage - Input Offset | 2.5 mV | 28 µV |
| Supply Current | 4.4mA (x2 Channels) | 3mA (x2 Channels) |
| Current - Output / Channel | 125 mA | 80 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 key differences between the ADA4896-2ARMZ and ADA4891-2ARMZ operational amplifiers?
The ADA4896-2ARMZ is a low-noise, high-speed voltage feedback amplifier with a gain bandwidth product of 230 MHz, 3 nV/√Hz input voltage noise, and 120 V/µs slew rate, optimized for precision signal conditioning. The ADA4891-2ARMZ is a lower-power, lower-cost CMOS rail-to-rail amplifier with 220 MHz gain bandwidth, 170 V/µs slew rate, and higher input voltage noise, suited for cost-sensitive, high-speed applications. They differ in input noise, supply current, input bias current, and output drive characteristics.
Are the ADA4896-2ARMZ and ADA4891-2ARMZ pin-compatible in the 8-lead MSOP package?
Both devices are offered in an 8-lead MSOP (RM) package with the same pinout: 1OUT, 1IN−, 1IN+, V−, 2IN+, 2IN−, 2OUT, and V+. However, pin compatibility does not guarantee electrical interchangeability; supply range, input bias current, noise, and output swing must be validated against the datasheets for the target design.
How do the supply voltage ranges of the ADA4896-2ARMZ and ADA4891-2ARMZ compare?
The ADA4896-2ARMZ operates from a single supply of 3 V to 10 V (or dual ±1.5 V to ±5 V). The ADA4891-2ARMZ operates from a single supply of 2.7 V to 5.5 V (or dual ±1.35 V to ±2.75 V). The ADA4896-2ARMZ supports a wider maximum supply voltage, while both are suitable for 3 V and 5 V systems.
Which device has lower input voltage noise, and how significant is the difference?
The ADA4896-2ARMZ has a specified input voltage noise density of 3 nV/√Hz at 100 kHz, while the ADA4891-2ARMZ has approximately 9 nV/√Hz. The ADA4896-2ARMZ is therefore preferable for low-noise precision front ends, whereas the ADA4891-2ARMZ is adequate for applications where noise is less critical.
How do the quiescent supply currents of the ADA4896-2ARMZ and ADA4891-2ARMZ compare?
The ADA4896-2ARMZ draws approximately 3 mA per amplifier (6 mA total for the dual), while the ADA4891-2ARMZ draws approximately 4.4 mA per amplifier. The ADA4891-2ARMZ is not a lower-power alternative in terms of quiescent current; designers should consult the latest datasheets for exact typical and maximum values over temperature.
Can the ADA4891-2ARMZ be used as a direct drop-in replacement for the ADA4896-2ARMZ?
No. Although both are dual amplifiers in an 8-lead MSOP with the same pinout, they differ in input voltage noise, input bias current, supply voltage range, output drive, and AC performance. A direct substitution requires revalidation of noise, stability, distortion, and supply headroom against the ADA4891-2ARMZ datasheet for the specific circuit.
Which device is better suited for driving high-resolution ADCs?
The ADA4896-2ARMZ is generally better suited for driving high-resolution ADCs because of its lower input voltage noise (3 nV/√Hz), lower distortion, and higher output current drive, which help preserve SNR and settling performance. The ADA4891-2ARMZ may be used in lower-resolution or cost-sensitive ADC driver designs where its noise and distortion specifications are acceptable.
Do both the ADA4896-2ARMZ and ADA4891-2ARMZ support rail-to-rail output swing?
Yes, both devices feature rail-to-rail output stages. The ADA4896-2ARMZ output swings to within approximately 0.1 V of the supply rails under specified load conditions, and the ADA4891-2ARMZ also provides rail-to-rail output swing. Actual headroom depends on load current and supply voltage, so the datasheet output swing curves should be consulted.