Part A
AD8418ABRMZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5876 PCS
- Package
- MSOP-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8418ABRMZ is a functionally compatible candidate for the AD8418BRMZ, sharing the same current-sense amplifier architecture, pinout, package, and supply requirements, with only a tightened gain error specification distinguishing the A-grade variant. Designers should confirm gain accuracy tolerance against their measurement budget before substituting.
Package Type
High match
Pin Configuration
High match
Supply Voltage Range
High match
Gain Error Accuracy
Validation required
Parts at a glance
Part B
AD8418BRMZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2540 PCS
- Package
- MSOP-8
- Series
- Linear - Amplifiers - Instrumentation, 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 | AD8418BRMZ | AD8418ABRMZ | Why it matters |
|---|---|---|---|
| Amplifier Type | Current Sense Amplifier | Current Sense Amplifier | Both are dedicated current-sense amplifiers, so the core function is identical and they are functionally interchangeable in current-measurement circuits. |
| Number of Channels | 1 | 1 | Single-channel configuration must match the number of current paths being monitored in the application. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | The supply range determines compatibility with the system rail; identical ranges mean either part can be powered from the same supply. |
| Input Common-Mode Voltage Range | -2 V to +70 V | -2 V to +70 V | The common-mode range defines the bus voltages the amplifier can sense; matching ranges ensure equivalent high-side sensing capability. |
| Gain | 20 V/V | 20 V/V | Fixed gain determines the output scaling relative to the sensed current; identical gain preserves the transfer function of the measurement. |
| Gain Error | ±0.3% max | ±0.3% max | Gain error affects measurement accuracy; matching specifications mean equivalent accuracy performance in the application. |
| Input Offset Voltage | ±200 µV max | ±200 µV max | Offset voltage directly limits low-current measurement accuracy; identical offset specs ensure comparable precision at low sense voltages. |
| Bandwidth | 250 kHz | 250 kHz | Bandwidth determines the maximum signal frequency the amplifier can accurately track; matching bandwidth supports the same dynamic current-monitoring needs. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range defines the environments in which the part can operate reliably; identical ranges mean equivalent thermal robustness. |
| Package / Mounting | 8-Lead MSOP, Surface Mount | 8-Lead MSOP, Surface Mount | Package and footprint compatibility allow drop-in replacement on the same PCB without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8418ABRMZ | AD8418BRMZ |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Current Sense | Current Sense |
| Number of Circuits | 1 | 1 |
| Slew Rate | 1V/µs | 1V/µs |
| -3 dB Bandwidth | 250 kHz | 250 kHz |
| Current - Input Bias | 130 µA | 130 µA |
| Supply Current | 4.1mA | 2.6mA |
| Voltage - Supply Span(Min) | 2.7 V | 2.7 V |
| Voltage - Supply Span(Max) | 5.5 V | 5.5 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Voltage - Input Offset | - | 200 µV |
Frequently asked questions
What are the key differences between the AD8418BRMZ and AD8418ABRMZ?
Both are current-sense amplifiers from Analog Devices in an 8-lead MSOP package. The primary difference is the gain error specification: the AD8418ABRMZ offers a tighter maximum gain error of ±0.15% at 25°C, while the AD8418BRMZ specifies ±0.3% maximum gain error at 25°C. Both share the same 20 V/V fixed gain, supply range, and pinout.
Do the AD8418BRMZ and AD8418ABRMZ have the same pinout and package?
Yes. Both devices are supplied in the same 8-lead MSOP (RM-8) package with an identical pin configuration, allowing them to share the same PCB footprint and land pattern.
What is the fixed gain of the AD8418BRMZ and AD8418ABRMZ?
Both devices provide a fixed gain of 20 V/V, as specified in the Analog Devices datasheet for the AD8418 family.
What supply voltage range do the AD8418BRMZ and AD8418ABRMZ support?
Both devices operate from a single supply of 2.7 V to 5.5 V, per the Analog Devices datasheet.
Can the AD8418ABRMZ be used as a drop-in replacement for the AD8418BRMZ?
Because both parts share the same package, pinout, gain, and supply range, the AD8418ABRMZ can generally serve as a drop-in replacement for the AD8418BRMZ. The AD8418ABRMZ provides a tighter gain error specification, so designs requiring improved gain accuracy may benefit. Verify all specifications against the Analog Devices datasheet for the target design.
What is the operating temperature range for the AD8418BRMZ and AD8418ABRMZ?
Both devices are specified for the industrial temperature range of −40°C to +125°C, per the Analog Devices datasheet.
Are the AD8418BRMZ and AD8418ABRMZ bidirectional current-sense amplifiers?
Yes. Both devices are bidirectional current-sense amplifiers capable of measuring current in both directions through the shunt resistor, as described in the Analog Devices AD8418 datasheet.