Part A
AD8476ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5337 PCS
- Package
- MSOP-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8475ARMZ and AD8476ARMZ are both fully differential amplifier products from Analog Devices in the same 8-lead MSOP package, sharing identical supply voltage ranges, pinout, and differential signal architecture. While their gain configurations and bandwidth specifications differ, the AD8476ARMZ can serve as a functional replacement candidate for the AD8475ARMZ in applications where the specific attenuation ratio and bandwidth of the AD8475ARMZ are not critical, but validation of gain accuracy and AC performance is recommended before substitution.
Package Type
High match
Supply Voltage Range
High match
Gain Configuration
Validation required
Bandwidth
Validation required
Parts at a glance
Part B
AD8475ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1838 PCS
- Package
- MSOP-10
- Series
- Linear - Amplificadores - Instrumentação, 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 | AD8475ARMZ | AD8476ARMZ | Why it matters |
|---|---|---|---|
| Amplifier Type | Fully Differential Amplifier with integrated attenuator (funnel amplifier) | Fully Differential Amplifier (unity-gain) | The AD8475 includes an integrated precision attenuator for signal scaling, while the AD8476 is a unity-gain differential amplifier; this fundamentally changes the signal chain architecture and gain configuration. |
| Fixed Gain / Attenuation | 0.4 (attenuation, pin-selectable 0.4 or 0.8) | 1 (unity gain) | Gain determines the input-to-output scaling; the AD8475 attenuates high-voltage inputs while the AD8476 passes signal at unity, affecting input range and downstream ADC requirements. |
| Input Voltage Range | ±10 V (with ±15 V supplies, attenuated) | ±VREF (limited by supply and reference) | The AD8475 can accept much larger input signals due to its attenuator, whereas the AD8476 input range is constrained by its supply rails and reference, affecting compatibility with high-voltage sensors. |
| Supply Voltage Range | ±5 V to ±15 V (dual supply) | ±2.5 V to ±15 V (dual supply) | Different minimum supply voltages affect low-voltage operation; the AD8476 supports lower supply rails, enabling use in more compact low-power systems. |
| -3 dB Bandwidth | 150 MHz (G = 0.4) | 5 MHz (G = 1) | Bandwidth determines the maximum signal frequency the amplifier can process; the AD8475 offers much wider bandwidth, suitable for high-speed signal chains, while the AD8476 targets lower-frequency precision applications. |
| Input Offset Voltage (max) | ±0.5 mV (typical), ±2 mV (max over temperature) | ±0.5 mV (typical), ±2.5 mV (max over temperature) | Offset voltage directly impacts DC accuracy; slight differences affect precision in low-level signal measurement and error budget calculations. |
| Output Common-Mode Adjustment | Via VOCM pin (external reference) | Via VOCM pin (external reference) | Both allow output common-mode setting for ADC interfacing, but the internal architecture and range differ, affecting level-shifting flexibility in mixed-supply systems. |
| Package | 8-lead MSOP (RMZ) | 8-lead MSOP (RMZ) | Identical package and pinout enable potential board-level drop-in evaluation, though electrical differences still require circuit redesign. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings mean both suit industrial environments equally; no thermal derating difference between the two. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8476ARMZ | AD8475ARMZ |
|---|---|---|
| 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 AD8475ARMZ and AD8476ARMZ?
The AD8475ARMZ is a fully differential funnel amplifier with selectable gains of 0.4 and 0.8, while the AD8476ARMZ is a fully differential amplifier with a fixed gain of 1. Both are housed in an 8-lead MSOP (RMZ) package and operate from a single 5 V supply, but they differ in gain configuration, input/output architecture, and typical application focus.
Are the AD8475ARMZ and AD8476ARMZ pin-compatible?
Yes. Both devices are offered in the same 8-lead MSOP (RMZ) package and share the same pinout, which allows them to be used on a common PCB footprint. However, pin compatibility does not guarantee functional interchangeability without validating gain, input range, and output swing requirements.
What are the supply voltage requirements for the AD8475ARMZ and AD8476ARMZ?
Both the AD8475ARMZ and AD8476ARMZ operate from a single 5 V supply (typically 5 V ±10%) and also support dual-supply operation. Designers should confirm the exact supply range and headroom requirements in the respective manufacturer datasheets before finalizing the power design.
Can the AD8475ARMZ and AD8476ARMZ be used interchangeably in a differential ADC driver application?
Not directly. The AD8475ARMZ provides selectable attenuation gains of 0.4 and 0.8, making it suited for attenuating higher-voltage differential signals before an ADC, while the AD8476ARMZ provides a fixed unity gain. Substitution requires re-evaluating the signal chain gain, input range, and ADC full-scale compatibility.
What is the gain configuration of each device?
The AD8475ARMZ offers pin-selectable gains of 0.4 and 0.8. The AD8476ARMZ is a fixed gain-of-1 fully differential amplifier. This difference is the primary reason the two parts are not drop-in replacements for one another.
Do both devices support differential input and differential output operation?
Yes. Both the AD8475ARMZ and AD8476ARMZ are fully differential amplifiers that accept differential inputs and produce differential outputs, making them suitable for driving differential-input ADCs. Their internal architectures and gain settings differ, so the appropriate choice depends on the required signal scaling.
What package do the AD8475ARMZ and AD8476ARMZ use?
Both devices are supplied in an 8-lead MSOP package, indicated by the "RMZ" suffix in the part number. The package is RoHS-compliant per the manufacturer's ordering information, and designers should verify the latest package and ordering details against official datasheets.
Which device should be selected for attenuating a high-voltage differential signal before an ADC?
The AD8475ARMZ is generally the appropriate choice when attenuation is required, because it provides selectable gains of 0.4 and 0.8. The AD8476ARMZ, with its fixed unity gain, does not attenuate the signal and is better suited to applications requiring buffering or unity-gain differential signal conditioning.