Part A
AD8402ARU10
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5184 PCS
- Package
- TSSOP-14
- Series
- Acquisition de données - potentiomètres numériques
Replacement verdict
Compatible functional replacement candidate
The AD8403ARUZ1 and AD8402ARU10 are both dual/quad-channel digital potentiometers from the AD840x family sharing the same TSSOP-14 footprint and SPI-compatible serial interface, but they differ in channel count and end-to-end resistance. The AD8403ARUZ1 offers four channels at 1 kΩ, while the AD8402ARU10 provides two channels at 10 kΩ, so substitution is feasible only where the reduced channel count and higher resistance value are acceptable to the application.
Channel Count
Validation required
End-to-End Resistance
Validation required
Package Type
High match
Digital Interface
High match
Parts at a glance
Part B
AD8403ARUZ1
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2995 PCS
- Package
- TSSOP-24
- 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 | AD8403ARUZ1 | AD8402ARU10 | Why it matters |
|---|---|---|---|
| Number of Potentiometers | 4 | 2 | Determines how many independent digitally controlled resistance channels are available in a single package, directly affecting circuit channel count and board space. |
| Nominal Resistance | 1 kΩ | 10 kΩ | Sets the end-to-end resistance range, which must match the impedance requirements of the surrounding analog circuit for correct gain or attenuation. |
| Resolution | 8-bit (256 positions) | 8-bit (256 positions) | Defines the number of discrete wiper steps and thus the achievable adjustment granularity of the resistance setting. |
| Interface Type | SPI (3-wire serial) | SPI (3-wire serial) | Determines the digital communication protocol required from the host controller for programming the wiper position. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Specifies the operating voltage window, ensuring compatibility with the system power rail and logic levels. |
| Package | 14-lead TSSOP | 14-lead TSSOP | Affects PCB footprint and assembly compatibility; identical packages allow drop-in replacement without layout changes. |
| Number of Wiper Positions per Channel | 256 (4 channels) | 256 (2 channels) | Combined with channel count, this defines the total programmable resistance resources available in the device. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Indicates the environmental conditions under which the device is guaranteed to meet specifications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8402ARU10 | AD8403ARUZ1 |
|---|---|---|
| Part Status | Obsolete | Active |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 4 |
| 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 |
| Features | - | Cascade Pin |
Frequently asked questions
What are the key differences between the AD8403ARUZ1 and AD8402ARU10?
The AD8403ARUZ1 is a quad-channel digital potentiometer with a 1 kΩ end-to-end resistance, while the AD8402ARU10 is a dual-channel device with a 10 kΩ end-to-end resistance. Both are 8-bit potentiometers from Analog Devices in a 14-lead TSSOP package, but they differ in channel count and nominal resistance value.
Are the AD8403ARUZ1 and AD8402ARU10 pin-compatible?
No. Although both devices are housed in a 14-lead TSSOP (RU-14) package, the AD8403 provides four independent potentiometers and the AD8402 provides two, so the pin functions and internal channel assignments differ. They are not direct drop-in replacements for each other.
What is the resolution and interface of these digital potentiometers?
Both the AD8403ARUZ1 and AD8402ARU10 are 8-bit (256-position) digital potentiometers that are programmed through a serial SPI-compatible 3-wire interface. They support daisy-chain operation and are specified for single-supply operation from 2.7 V to 5.5 V.
How does the end-to-end resistance affect selection between the two parts?
The AD8403ARUZ1 offers a 1 kΩ nominal end-to-end resistance, while the AD8402ARU10 offers 10 kΩ. The choice depends on the target circuit's required wiper current, power dissipation, and the RC time constants or gain settings in the application; the 1 kΩ version suits lower-impedance signal paths, and the 10 kΩ version suits higher-impedance or lower-power settings.
What are the operating temperature and supply voltage ranges for these devices?
Both the AD8403ARUZ1 and AD8402ARU10 are specified for operation from 2.7 V to 5.5 V single supply and over the industrial temperature range of −40 °C to +85 °C, per Analog Devices datasheet specifications.
Can the AD8402ARU10 be used where an AD8403ARUZ1 was designed in?
Not directly. The AD8403ARUZ1 provides four potentiometers and the AD8402ARU10 provides two, and their nominal resistances differ (1 kΩ versus 10 kΩ). A substitution requires verifying channel count, resistance, pinout, and control-word compatibility against the Analog Devices datasheets before any board or firmware change.
What package do the AD8403ARUZ1 and AD8402ARU10 use?
Both parts are supplied in the 14-lead TSSOP package (Analog Devices RU-14 suffix). The "Z" in AD8403ARUZ1 denotes RoHS-compliant lead-free construction; designers should confirm the exact ordering code and compliance status on the Analog Devices product page for the AD8402ARU10 as well.