Part A
AD8402ARZ100
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1274 PCS
- Package
- SOIC-14
- Series
- Acquisição de dados - Potenciômetros Digitais
Replacement verdict
Not a drop-in replacement
The AD8400ARZ10 and AD8402ARZ100 are not drop-in replacements for each other. Although both are single-supply digital potentiometers from the same AD840x family, they differ in channel count, end-to-end resistance, and package pinout, so a direct board-level substitution is not possible without design changes.
Different channel count
Different end-to-end resistance
Different package pinout
Different footprint
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 | AD8402ARZ100 | Why it matters |
|---|---|---|---|
| Number of Resistor Channels | 1 | 2 | Determines how many independent programmable resistance paths are available; a single-channel part cannot replace a dual-channel part in circuits needing two independent adjustments. |
| End-to-End Resistance | 10 kΩ | 100 kΩ | Sets the nominal resistance range of the digital potentiometer; a 10x difference changes the current/voltage scaling and may not be substitutable without redesigning surrounding circuitry. |
| Resolution (Number of Positions) | 256 positions (8-bit) | 256 positions (8-bit) | Defines the number of discrete wiper steps; identical 8-bit resolution means both offer the same adjustment granularity. |
| Digital Interface | SPI (3-wire serial) | SPI (3-wire serial) | The control bus must match the host microcontroller; both use the same 3-wire serial interface, so firmware and wiring are compatible. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Determines compatibility with the system power rail; identical ranges allow operation from the same supply. |
| Package | 8-lead SOIC | 8-lead SOIC | Footprint and assembly compatibility; identical package allows drop-in board placement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental envelope for reliable operation; identical ratings mean both suit the same application conditions. |
| Wiper Resistance (Typical) | ~50 Ω (at 10 kΩ end-to-end) | ~100 Ω (at 100 kΩ end-to-end) | Wiper resistance adds a fixed series error to the programmed value; the difference affects accuracy, especially at low resistance settings. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8402ARZ100 | AD8400ARZ10 |
|---|---|---|
| Part Status | Active | Active |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 1 |
| Number of Taps | 256 | 256 |
| Resistance(Ohms) | 100k | 10k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±30% | ±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 are the key differences between the AD8400ARZ10 and AD8402ARZ100?
The AD8400ARZ10 is a single-channel digital potentiometer with a 10 kΩ end-to-end resistance, while the AD8402ARZ100 is a dual-channel device with a 100 kΩ end-to-end resistance. Both are 8-bit (256-position) volatile digital potentiometers from Analog Devices in an 8-lead SOIC package, but they differ in channel count and nominal resistance.
Do the AD8400ARZ10 and AD8402ARZ100 use the same digital interface?
Yes. Both devices use a 3-wire SPI-compatible serial interface (CS, SDI, SCLK) for programming the wiper position, consistent with the AD8400/AD8402/AD8403 family datasheet.
Are the AD8400ARZ10 and AD8402ARZ100 pin-compatible?
No. The AD8400ARZ10 is a single-channel device in an 8-lead SOIC, while the AD8402ARZ100 is a dual-channel device in an 8-lead SOIC with a different pin function assignment (the dual device uses the pins for two independent potentiometers). They should not be treated as drop-in replacements without verifying the pinout against the respective datasheets.
What is the resolution and number of wiper positions for these devices?
Both the AD8400ARZ10 and AD8402ARZ100 are 8-bit digital potentiometers offering 256 wiper positions (0 to 255), as specified in the Analog Devices AD8400/AD8402/AD8403 datasheet.
What supply voltage range do the AD8400ARZ10 and AD8402ARZ100 support?
Both devices operate from a single supply of 2.7 V to 5.5 V, per the AD8400/AD8402/AD8403 datasheet specifications.
Are the AD8400ARZ10 and AD8402ARZ100 volatile or non-volatile?
Both are volatile digital potentiometers; the wiper setting is lost on power-down and must be reprogrammed after each power-up. Neither device includes non-volatile EEMEM storage.
What is the operating temperature range for these devices?
The AD8400ARZ10 and AD8402ARZ100 are specified over the industrial temperature range of −40 °C to +85 °C, as stated in the Analog Devices datasheet.
Can the AD8400ARZ10 be used as a direct substitute for the AD8402ARZ100 in an existing design?
No. Beyond the channel-count and resistance differences, the pinouts and internal architecture differ between the single-channel AD8400 and dual-channel AD8402. A direct substitution would require schematic and layout changes and revalidation against the target design requirements.