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 AD8417BRMZ and AD8418ABRMZ are functionally compatible current-sense amplifiers sharing the same gain, supply range, and package footprint, making the AD8418ABRMZ a viable replacement candidate for the AD8417BRMZ in most designs. Designers should validate the bidirectional offset behavior and bandwidth requirements against their specific application before final substitution.
Package Type
High match
Gain
High match
Input Offset Configuration
Validation required
Bandwidth
Validation required
Parts at a glance
Part B
AD8417BRMZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3310 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 | AD8417BRMZ | AD8418ABRMZ | Why it matters |
|---|---|---|---|
| Amplifier Type | Current Sense Amplifier | Current Sense Amplifier | Both are dedicated current-sense amplifiers, so they serve the same core function in a signal chain. |
| Number of Channels | 1 | 1 | Single-channel configuration must match for pin-compatible substitution in single-phase sensing designs. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical supply range ensures the part can drop into the same rail without reworking the power design. |
| Gain | 20 V/V | 20 V/V | Fixed gain determines the output scaling for a given shunt voltage; matching gain preserves system calibration. |
| Input Offset Voltage (max) | ±200 µV | ±200 µV | Offset directly limits low-current measurement accuracy; equal offset specs mean comparable precision. |
| Common-Mode Input Range | −2 V to +70 V | −2 V to +70 V | Wide common-mode range allows high-side sensing; identical range ensures the same bus voltages can be monitored. |
| Bandwidth | 250 kHz | 250 kHz | Bandwidth sets the maximum signal frequency the amplifier can accurately track; matching values preserve dynamic response. |
| CMRR | 100 dB | 100 dB | Common-mode rejection determines immunity to bus voltage swings; equal CMRR means equivalent rejection performance. |
| Operating Temperature Range | −40 °C to +125 °C | −40 °C to +125 °C | Identical temperature ratings confirm both parts suit the same environmental conditions. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Same package and pinout enable direct board-level replacement 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 | AD8418ABRMZ | AD8417BRMZ |
|---|---|---|
| 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 | 4.1mA |
| 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 AD8417BRMZ and AD8418ABRMZ?
Both are bidirectional current-sense amplifiers from Analog Devices in an 8-lead MSOP package. The AD8417BRMZ has a fixed gain of 60 V/V, while the AD8418ABRMZ has a fixed gain of 20 V/V. The AD8418A also specifies a lower typical input offset drift and is characterized for a wider specified temperature range in its datasheet. Pin functions and package footprint are identical, but the gain difference means they are not interchangeable without recalibrating the sense resistor and signal chain.
Are the AD8417BRMZ and AD8418ABRMZ pin-compatible?
Yes. Both devices are offered in the same 8-lead MSOP (RM) package with the same pinout, so the PCB land pattern is identical. However, pin compatibility does not imply electrical interchangeability because the fixed gains differ (60 V/V vs 20 V/V).
What is the gain of each device?
The AD8417BRMZ provides a fixed gain of 60 V/V. The AD8418ABRMZ provides a fixed gain of 20 V/V. The gain is set internally and is not adjustable.
What common-mode input voltage range do these amplifiers support?
Both devices are designed for high-side and low-side current sensing with a common-mode input range that extends from -2 V to +70 V, independent of the supply voltage, per the Analog Devices datasheets. This allows operation in applications where the common-mode voltage exceeds the amplifier supply.
What supply voltage do the AD8417BRMZ and AD8418ABRMZ require?
Both devices operate from a single supply of 2.7 V to 5.5 V. The output swing and input common-mode range should be verified against the specific application conditions using the manufacturer datasheet.
Can the AD8418ABRMZ directly replace the AD8417BRMZ in an existing design?
Not without design review. Although the package and pinout are identical, the gain changes from 60 V/V to 20 V/V, which alters the output voltage for a given sense resistor and load current. The sense resistor value, ADC full-scale range, and calibration must be re-evaluated before substitution.
What are typical applications for these current-sense amplifiers?
Both parts are intended for bidirectional current sensing in motor control, solenoid and valve control, power management, and battery monitoring. The AD8417BRMZ's higher gain suits lower-value shunt resistors or smaller current ranges, while the AD8418ABRMZ's 20 V/V gain suits higher-current or wider-dynamic-range measurements.