Part A
AD8403ARZ10
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 1668 PCS
- Package
- SOIC-24
- Series
- Acquisition de données - potentiomètres numériques
Replacement verdict
Not a drop-in replacement
The AD8400ARZ1 and AD8403ARZ10 are not drop-in replacements for one another. The AD8400ARZ1 is a single-channel digital potentiometer in an 8-lead SOIC package, while the AD8403ARZ10 is a quad-channel device in a 24-lead SOIC package with a different end-to-end resistance. The channel count, package footprint, and resistance value all differ, so a direct board-level substitution is not possible without redesign.
Different channel count
Different package footprint
Different end-to-end resistance
Different pin configuration
Parts at a glance
Part B
AD8400ARZ1
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4740 PCS
- Package
- SOIC-8
- Series
- Acquisition de données - potentiomètres numériques
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8400ARZ1 | AD8403ARZ10 | Why it matters |
|---|---|---|---|
| Number of Resistor Channels | 1 | 4 | Determines how many independent digital potentiometer channels are available in a single package; a single-channel part cannot replace a quad-channel design without adding external components. |
| End-to-End Resistance | 1 kΩ | 10 kΩ | Sets the nominal resistance range of the potentiometer, directly affecting the current, gain, and signal levels in the circuit; substituting a different value changes circuit behavior. |
| Resolution | 8-bit (256 positions) | 8-bit (256 positions) | Defines the number of wiper tap positions and thus the adjustment granularity; matching resolution ensures equivalent control precision. |
| Digital Interface | SPI (3-wire serial) | SPI (3-wire serial) | Determines how the host controller communicates with the device; identical interfaces allow reuse of the same firmware and bus wiring. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the operating voltage window; matching ranges ensure compatibility with the same system power rail. |
| Package | 8-lead SOIC | 24-lead SOIC | Affects PCB footprint and layout; different package sizes require board redesign and cannot be drop-in substituted. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Indicates the environmental range over which specifications are guaranteed; matching ranges ensure equivalent reliability in the target application. |
| Number of Wiper Positions per Channel | 256 | 256 | Confirms the tap count per channel; equal values mean the same adjustment granularity per channel despite the channel-count difference. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8403ARZ10 | AD8400ARZ1 |
|---|---|---|
| Part Status | Active | Active |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 4 | 1 |
| Number of Taps | 256 | 256 |
| Resistance(Ohms) | 10k | 1k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Features | Cascade Pin | - |
| Tolerance | ±20% | ±33% |
| Temperature Coefficient(Typ) | 500ppm/°C | 700ppm/°C |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD8400ARZ1 and AD8403ARZ10 digital potentiometers?
The AD8400ARZ1 is a single-channel, 1 kΩ digital potentiometer in an 8-lead SOIC package, while the AD8403ARZ10 is a quad-channel, 10 kΩ digital potentiometer in a 24-lead SOIC package. The AD8400 provides one digitally controlled resistor, whereas the AD8403 integrates four independent potentiometers in one device.
How many resistor channels does each device provide?
The AD8400ARZ1 offers a single channel (one potentiometer), and the AD8403ARZ10 offers four independent channels (quad potentiometer). This channel count difference is fundamental when selecting between the two for multi-channel adjustment applications.
What are the end-to-end resistance values of the AD8400ARZ1 and AD8403ARZ10?
The AD8400ARZ1 has a 1 kΩ end-to-end resistance (the "1" suffix denotes 1 kΩ). The AD8403ARZ10 has a 10 kΩ end-to-end resistance (the "10" suffix denotes 10 kΩ). Resistance value affects wiper current, power dissipation, and the resolution of the adjustable resistance.
What digital interface do the AD8400ARZ1 and AD8403ARZ10 use?
Both devices use a 3-wire SPI-compatible serial interface (CS, SDI, and SCLK) for programming the wiper position. The AD8403ARZ10 additionally uses the same serial data input to address each of its four channels via internal address decoding.
What are the package and pin count differences between the two parts?
The AD8400ARZ1 is supplied in an 8-lead SOIC package, while the AD8403ARZ10 is supplied in a 24-lead SOIC package. The larger package of the AD8403 accommodates the four independent potentiometers and their associated control and address pins.
Can the AD8400ARZ1 be used as a drop-in replacement for the AD8403ARZ10?
No. The two devices differ in channel count (1 vs. 4), end-to-end resistance (1 kΩ vs. 10 kΩ), package footprint (8-lead vs. 24-lead SOIC), and pinout. A direct substitution is not possible without redesigning the PCB and validating the resistance and channel requirements against the application.
What supply voltage range do the AD8400ARZ1 and AD8403ARZ10 support?
Both devices operate from a single supply in the 2.7 V to 5.5 V range, as specified in the Analog Devices AD8400/AD8403 datasheet. This makes them suitable for low-voltage digital control applications in portable and embedded systems.
How many wiper positions (resolution) do these digital potentiometers provide?
Both the AD8400ARZ1 and AD8403ARZ10 provide 256 wiper positions (8-bit resolution), programmable via the serial interface. The resolution is independent of the end-to-end resistance value, so the 1 kΩ and 10 kΩ versions both offer 256 steps.