Part A
ADA4891-2ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6456 Stückzahl
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Compatible functional replacement candidate
The ADA4896-2ARMZ-RL is a higher-performance functional upgrade candidate for the ADA4891-2ARMZ, sharing the same dual op-amp configuration and MSOP-8 footprint while offering substantially greater bandwidth and lower distortion. Designers should validate supply headroom, input bias current, and capacitive-load stability before adopting it as a direct substitute in existing ADA4891-2ARMZ sockets.
Package Type
High match
Channel Count
High match
Supply Voltage Range
Validation required
Input Bias Current
Validation required
Parts at a glance
Part B
ADA4896-2ARMZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8316 Stückzahl
- Package
- TSSOP-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
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 | ADA4896-2ARMZ-RL | Why it matters |
|---|---|---|---|
| -3 dB Bandwidth | 240 MHz | 90 MHz | Bandwidth determines the maximum signal frequency the amplifier can handle with acceptable gain; a large difference affects high-speed signal fidelity. |
| Slew Rate | 170 V/µs | 120 V/µs | Slew rate limits how fast the output can respond to large signal steps; it affects large-signal bandwidth and distortion performance. |
| Input Voltage Noise Density | 9 nV/√Hz | 1 nV/√Hz | Lower input voltage noise improves signal-to-noise ratio in low-level signal applications; this is a major differentiator for precision designs. |
| Supply Voltage Range | 2.7 V to 5.5 V | 3 V to 10 V | The supply range determines compatibility with system power rails; the wider range of the second part allows higher-voltage operation. |
| Quiescent Current (per amplifier) | 4.4 mA | 3 mA | Quiescent current affects power consumption and thermal budget, which is critical in portable and high-density designs. |
| Input Offset Voltage (max) | 6 mV | 0.5 mV | Offset voltage directly impacts DC accuracy; a much lower offset makes the second part suitable for precision signal chains. |
| Output Current (short-circuit) | 110 mA | 80 mA | Output drive capability determines the ability to drive low-impedance loads such as cables or ADCs; it affects load-driving flexibility. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range indicates environmental robustness; identical ranges mean both suit the same industrial temperature environments. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Package compatibility ensures the parts are drop-in interchangeable on the same PCB footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADA4891-2ARMZ | ADA4896-2ARMZ-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 | 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 ADA4891-2ARMZ and the ADA4896-2ARMZ-RL?
The ADA4891-2ARMZ is a dual, low-cost, high-speed voltage feedback amplifier with a −3 dB bandwidth of 240 MHz and a slew rate of 170 V/µs, operating on a single 2.7 V to 5.5 V supply. The ADA4896-2ARMZ-RL is a dual, low-power, low-noise, rail-to-rail output amplifier with a −3 dB bandwidth of 90 MHz, a slew rate of 120 V/µs, and a low input voltage noise of 1 nV/√Hz, operating on a 3 V to 10 V supply. The ADA4896-2ARMZ-RL is supplied in a 500-unit reel (RL suffix), while the ADA4891-2ARMZ is supplied in standard tube/tray packaging.
Are the ADA4891-2ARMZ and ADA4896-2ARMZ-RL pin-compatible?
Yes. Both devices are offered in the same 8-lead MSOP (RM) package with identical pin functions: pin 1 and 2 are the outputs, pins 3 and 6 are the inverting inputs, pins 4 and 5 are the non-inverting inputs, pin 7 is V+, and pin 8 is V−. This allows the same PCB land pattern to be used for either device.
Can the ADA4891-2ARMZ be used as a direct drop-in replacement for the ADA4896-2ARMZ-RL?
Not unconditionally. Although the pinout and package are identical, the two amplifiers differ in supply voltage range (2.7 V to 5.5 V for the ADA4891-2ARMZ versus 3 V to 10 V for the ADA4896-2ARMZ-RL), bandwidth (240 MHz versus 90 MHz), input voltage noise (approximately 9 nV/√Hz versus 1 nV/√Hz), and quiescent current. The replacement must be validated against the target design's supply, noise, bandwidth, and stability requirements using the respective manufacturer datasheets.
How do the supply voltage ranges of the two amplifiers compare?
The ADA4891-2ARMZ operates on a single supply from 2.7 V to 5.5 V (or dual supplies within that total range). The ADA4896-2ARMZ-RL operates on a single supply from 3 V to 10 V (or dual supplies within that total range). Designs operating above 5.5 V cannot use the ADA4891-2ARMZ, and designs operating below 3 V cannot use the ADA4896-2ARMZ-RL.
Which device offers lower input voltage noise?
The ADA4896-2ARMZ-RL offers significantly lower input voltage noise, specified at 1 nV/√Hz typical, making it suitable for low-noise signal conditioning and precision applications. The ADA4891-2ARMZ has a higher input voltage noise specification (approximately 9 nV/√Hz typical) and is intended for cost-sensitive, high-speed applications where noise is less critical.
How do the bandwidth and slew rate of the two amplifiers compare?
The ADA4891-2ARMZ provides a −3 dB bandwidth of 240 MHz with a slew rate of 170 V/µs, giving it an advantage in high-speed signal paths. The ADA4896-2ARMZ-RL provides a −3 dB bandwidth of 90 MHz with a slew rate of 120 V/µs, trading bandwidth for lower noise and lower power consumption.
What does the "-RL" suffix on the ADA4896-2ARMZ-RL indicate?
The "-RL" suffix denotes reel packaging. The ADA4896-2ARMZ-RL is supplied on a 500-unit reel for automated assembly, whereas the ADA4891-2ARMZ is supplied in standard tube or tray packaging. The electrical specifications of the device are not changed by the packaging suffix.
Which amplifier is better suited for low-power, low-noise applications?
The ADA4896-2ARMZ-RL is the better choice for low-noise applications due to its 1 nV/√Hz input voltage noise and rail-to-rail output, and it is optimized for low power consumption. The ADA4891-2ARMZ is a lower-cost, higher-bandwidth option better suited to cost-sensitive, high-speed designs where its higher noise floor is acceptable.