Part A
AD8402ARZ10
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6644 PCS
- Package
- SOIC-14
- Series
- Acquisition de données - potentiomètres numériques
Replacement verdict
Not a drop-in replacement
The AD8400ARZ1 and AD8402ARZ10 are not drop-in replacements for each other. The AD8400ARZ1 is a single-channel digital potentiometer with a 1 kΩ end-to-end resistance, while the AD8402ARZ10 is a dual-channel device with a 10 kΩ end-to-end resistance. The differences in channel count, resistance value, and package pinout prevent direct substitution without circuit redesign and validation.
Different channel count
Different end-to-end resistance
Different package pinout
Different wiper 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 | AD8402ARZ10 | Why it matters |
|---|---|---|---|
| Number of Resistor Taps | 256 | 256 | Tap count determines the resolution of the digital potentiometer; both offer 8-bit (256-position) adjustment. |
| Number of Potentiometers per Package | 1 | 2 | A single-channel vs dual-channel device changes how many independent resistance adjustments are available in one package, affecting circuit architecture and board space. |
| Nominal Resistance | 1 kΩ | 10 kΩ | End-to-end resistance sets the current/voltage range and loading behavior in the application; substituting a different value changes gain, attenuation, and power dissipation. |
| Interface Type | SPI (3-wire serial) | SPI (3-wire serial) | Both use the same serial control interface, so firmware and microcontroller pin connections remain compatible. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply ranges ensure the parts can operate in the same system power rail without level shifting or regulator changes. |
| Package Type | 8-lead SOIC | 14-lead SOIC | Different package footprints require different PCB layouts; the dual-channel part needs more pins and board area. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings confirm both parts suit the same environmental conditions and reliability requirements. |
| Resolution | 8 bit | 8 bit | Equal resolution means the same number of discrete wiper settings, preserving adjustment granularity in the design. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8402ARZ10 | AD8400ARZ1 |
|---|---|---|
| Part Status | Active | Active |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 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 |
| 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 AD8402ARZ10 digital potentiometers?
The AD8400ARZ1 is a single-channel digital potentiometer with a 1 kΩ end-to-end resistance, while the AD8402ARZ10 is a dual-channel device with a 10 kΩ end-to-end resistance. Both are 8-bit (256-position) devices from Analog Devices in 8-lead SOIC packages, but they differ in channel count and nominal resistance value.
How many channels does each device provide?
The AD8400ARZ1 provides one independent digitally controlled potentiometer channel. The AD8402ARZ10 provides two independent channels in the same package family, allowing two separate resistance settings to be controlled.
What is the resolution and number of wiper positions for these devices?
Both the AD8400ARZ1 and AD8402ARZ10 are 8-bit digital potentiometers offering 256 wiper positions (0 to 255), programmable through a serial interface.
What end-to-end resistance values do the AD8400ARZ1 and AD8402ARZ10 offer?
The AD8400ARZ1 has a nominal end-to-end resistance of 1 kΩ. The AD8402ARZ10 has a nominal end-to-end resistance of 10 kΩ. These values determine the wiper resistance range and the step size per code.
What serial interface do these digital potentiometers use?
Both devices use a 3-wire SPI-compatible serial interface for programming the wiper position, consisting of chip select, serial data input, and clock signals.
What package and pin configuration do the AD8400ARZ1 and AD8402ARZ10 use?
Both parts are supplied in an 8-lead SOIC package (ARZ suffix indicates SOIC and RoHS-compliant). The AD8400ARZ1 uses the 8-lead package for its single channel, while the AD8402ARZ10 fits two channels into the same 8-lead SOIC footprint.
Can the AD8400ARZ1 be used as a drop-in replacement for the AD8402ARZ10?
No. They are not directly interchangeable: the AD8400ARZ1 is single-channel with 1 kΩ resistance, whereas the AD8402ARZ10 is dual-channel with 10 kΩ resistance. Channel count, resistance value, and internal register mapping differ, so substitution requires design validation against the datasheet.
What supply voltage range do these devices support?
Both the AD8400ARZ1 and AD8402ARZ10 operate from a single supply in the 2.7 V to 5.5 V range, as specified in the Analog Devices datasheet for the AD8400/AD8402/AD8403 family.