Part A
AD8476BRMZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6105 PCS
- Package
- MSOP-8
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Replacement verdict
Compatible functional replacement candidate
The AD8476BRMZ and AD8475ARMZ-RL are both fully differential amplifier products from Analog Devices, but they differ in gain configuration, supply voltage range, and package footprint. The AD8475ARMZ-RL offers a pin-compatible LFCSP option with selectable gain, making it a viable functional candidate only after validating gain requirements, supply rails, and board layout against the AD8476BRMZ design.
Gain Configuration
Validation required
Supply Voltage Range
Validation required
Package Type
Not compatible
Output Type
High match
Parts at a glance
Part B
AD8475ARMZ-RL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7750 PCS
- Package
- MSOP-10
- Series
- Amplificateurs linéaires - instruments, amplificateurs opérationnels, amplificateurs tampons
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8476BRMZ | AD8475ARMZ-RL | Why it matters |
|---|---|---|---|
| Amplifier Type | Fully Differential Amplifier | Fully Differential Amplifier with integrated attenuator | Both are differential amplifiers, but the AD8475 includes a precision attenuator, affecting signal scaling and input range. |
| Number of Channels | 1 | 1 | Single-channel configuration in both parts; channel count must match the signal path requirement. |
| Gain Configuration | Fixed gain of 1 (unity) | Pin-selectable attenuation of 0.4 or 0.8 | Gain/attenuation determines output scaling relative to input; the two parts are not directly interchangeable without accounting for this. |
| Supply Voltage Range | ±2.5 V to ±15 V (dual) or 5 V to 30 V (single) | 3 V to 10 V (single) or ±1.5 V to ±5 V (dual) | Supply range must be compatible with the system rails; the AD8476 supports higher supply voltages than the AD8475. |
| Bandwidth (-3 dB) | 5 MHz | 150 MHz | Bandwidth limits the maximum signal frequency the amplifier can process; the AD8475 supports much higher-frequency signals. |
| Input Offset Voltage | 200 µV (max) | 500 µV (max) | Offset voltage affects DC accuracy; lower offset is preferable for precision signal chains. |
| Package / Mounting | 8-Lead MSOP (surface mount) | 16-Lead LFCSP (surface mount) | Package footprint and pin count differ, so PCB layout changes are required when substituting one for the other. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so environmental compatibility is equivalent. |
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 | AD8476BRMZ | AD8475ARMZ-RL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Amplifier Type | Differential | Differential |
| Number of Circuits | 1 | 1 |
| Output Type | Differential, Rail-to-Rail | Differential, Rail-to-Rail |
| Slew Rate | 10V/µs | 50V/µs |
| -3 dB Bandwidth | 5 MHz | 150 MHz |
| Supply Current | 330µA | 3mA |
| Current - Output / Channel | 35 mA | 110 mA |
| Voltage - Supply Span(Min) | 3 V | 3 V |
| Voltage - Supply Span(Max) | 18 V | 10 V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8476BRMZ and AD8475ARMZ-RL?
The AD8476BRMZ is a fully differential amplifier/attenuator with a fixed gain of 1 (0 dB) and an output common-mode voltage that is set externally via the VOCM pin. The AD8475ARMZ-RL is a fully differential amplifier/attenuator with a fixed gain of 0.4 (attenuation) and an internal common-mode feedback loop that sets the output common-mode voltage to mid-supply by default. Both are available in 8-lead MSOP packages, but they differ in gain configuration, output common-mode architecture, and specified dynamic performance.
Are the AD8476BRMZ and AD8475ARMZ-RL pin-compatible?
Both devices are offered in an 8-lead MSOP (RM) package, but pin compatibility must be verified against the respective manufacturer datasheets because pin functions such as VOCM, VREF, and feedback connections may differ between the two products. Do not assume direct drop-in replacement without confirming the pinout and external component requirements from the official Analog Devices documentation.
What is the gain configuration of each device?
The AD8476BRMZ provides a fixed gain of 1 (0 dB), making it suitable for unity-gain differential signal conditioning. The AD8475ARMZ-RL provides a fixed gain of 0.4, which attenuates the differential input signal, making it suitable for driving lower-voltage ADCs from higher-voltage sources. The gain difference is a primary selection criterion between the two parts.
How is the output common-mode voltage set on each device?
On the AD8476BRMZ, the output common-mode voltage is set externally by driving the VOCM pin, allowing the user to match the ADC input common-mode requirement. On the AD8475ARMZ-RL, an internal common-mode feedback loop sets the output common-mode voltage, typically to mid-supply, reducing external component count. Designers should confirm the exact VOCM behavior and recommended voltage ranges in the respective datasheets.
What are the supply voltage and power requirements for these devices?
Both the AD8476BRMZ and AD8475ARMZ-RL are designed for single-supply or dual-supply operation, with typical supply voltages in the range of ±5 V or +5 V single supply, depending on the configuration. Exact supply voltage limits, quiescent current, and power dissipation must be verified from the official Analog Devices datasheets, as these parameters determine thermal and power budget considerations in the target design.
Which device is better suited for driving a low-voltage ADC?
The AD8475ARMZ-RL, with its fixed gain of 0.4, is generally better suited for attenuating higher-voltage differential signals to match the input range of low-voltage ADCs. The AD8476BRMZ, with unity gain, is more appropriate when the signal amplitude already matches the ADC input range and only buffering or differential conversion is required. Final selection should be based on the ADC input range, signal amplitude, and verified datasheet parameters.
Can these devices be used interchangeably in an existing design?
They should not be treated as interchangeable without validation. The gain difference (1 vs 0.4), output common-mode architecture, and potentially different pin functions mean that substituting one for the other can change signal scaling, common-mode levels, and overall system performance. Any substitution must be validated against the manufacturer datasheets and the specific application requirements.