Part A
AD8402ARZ10
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6644 PCS
- Package
- SOIC-14
- Series
- Acquisição de dados - Potenciômetros Digitais
Replacement verdict
Compatible functional replacement candidate
The AD8400ARZ10 and AD8402ARZ10 are both single-channel 10 kΩ digital potentiometers from the AD8400/AD8402 family, sharing identical resolution, end-to-end resistance, and SOIC-8 packaging, so the AD8402ARZ10 can serve as a functional substitute for the AD8400ARZ10 in most designs. The primary distinction is the digital interface: the AD8400ARZ10 uses a 3-wire SPI-compatible serial interface, while the AD8402ARZ10 uses a 2-wire I²C-compatible interface, so the host firmware and bus topology must be validated before substitution.
End-to-End Resistance
High match
Resolution
High match
Package Type
High match
Digital Interface
Validation required
Parts at a glance
Part B
AD8400ARZ10
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5319 PCS
- Package
- SOIC-8
- Series
- Acquisição de dados - Potenciômetros Digitais
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8400ARZ10 | AD8402ARZ10 | Why it matters |
|---|---|---|---|
| Number of Potentiometers | 1 | 2 | Determines how many independent digitally controlled resistance channels are available; a single-channel part cannot replace a dual-channel part in circuits requiring two independent adjustments. |
| Resistance Value | 10 kΩ | 10 kΩ | Sets the end-to-end resistance range of the potentiometer; matching values ensures comparable signal attenuation and current levels in the target circuit. |
| Resolution (Number of Positions) | 256 positions (8-bit) | 256 positions (8-bit) | Defines the number of discrete wiper settings; identical resolution means the same adjustment granularity and step size. |
| Digital Interface | SPI (3-wire serial) | SPI (3-wire serial) | Determines how the host controller communicates with the device; matching interfaces allows the same firmware and bus wiring to be reused. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the operating voltage window; identical ranges ensure compatibility with the same power rail and logic levels. |
| Package | 8-lead SOIC | 14-lead SOIC | Affects PCB footprint and pin count; different packages require layout changes and cannot be drop-in substituted on the same board. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Specifies the environmental range over which the device is guaranteed to operate; matching ranges ensure equivalent thermal robustness. |
| Wiper Resistance | ~50 Ω (typical) | ~50 Ω (typical) | Adds a fixed series resistance at the wiper terminal; matching values preserve the effective resistance seen by the load. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8402ARZ10 | AD8400ARZ10 |
|---|---|---|
| Part Status | Active | Active |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 1 |
| Number of Taps | 256 | 256 |
| Resistance(Ohms) | 10k | 10k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±20% | ±20% |
| Temperature Coefficient(Typ) | 500ppm/°C | 500ppm/°C |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What is the primary difference between the AD8400ARZ10 and AD8402ARZ10?
The AD8400ARZ10 is a single-channel digital potentiometer, while the AD8402ARZ10 is a dual-channel version. Both are 10 kΩ, 256-position devices in an 8-lead SOIC package, but the AD8402 provides two independent potentiometers in the same footprint.
Do the AD8400ARZ10 and AD8402ARZ10 have the same resistance value and resolution?
Yes. Both parts offer a 10 kΩ end-to-end resistance and 256 wiper positions (8-bit resolution), as specified in the Analog Devices AD8400/AD8402/AD8403 datasheet.
Are the AD8400ARZ10 and AD8402ARZ10 pin-compatible?
No. Although both use an 8-lead SOIC package, the pin functions differ. The AD8400 uses the pins for a single potentiometer plus serial data interface, while the AD8402 assigns pins to two potentiometers (A1, B1, W1, A2, B2, W2) along with the serial interface, so they are not drop-in replacements.
What serial interface do the AD8400ARZ10 and AD8402ARZ10 use?
Both devices use a 3-wire SPI-compatible serial interface (CS, SDI, SCLK) for programming the wiper position, per the Analog Devices datasheet.
What is the operating voltage range for the AD8400ARZ10 and AD8402ARZ10?
Both devices operate from a single supply of 2.7 V to 5.5 V, as stated in the Analog Devices AD8400/AD8402/AD8403 datasheet.
Can the AD8400ARZ10 be used as a direct substitute for the AD8402ARZ10 in an existing design?
No. The AD8402 provides two independent potentiometers, whereas the AD8400 provides only one. A design requiring dual channels cannot use the single-channel AD8400 without redesign, and the differing pin assignments prevent direct substitution.
What are the typical applications for the AD8400ARZ10 and AD8402ARZ10?
Both are used for digital volume control, gain adjustment, offset trimming, and programmable filtering. The AD8402ARZ10 is preferred where two independent adjustment channels are needed in a compact 8-lead SOIC package.