Part A
AD8402ARU10
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5184 PCS
- Package
- TSSOP-14
- Series
- Data Acquisition - Digital Potentiometers
Replacement verdict
Compatible functional replacement candidate
The AD8402ARU10 and AD8403ARU100 share the same digital potentiometer family, TSSOP-14 package, and 10 kΩ end-to-end resistance, but differ in channel count and per-channel resolution, so the AD8403ARU100 can serve as a functional substitute only when the design can accommodate two additional channels and a coarser 100-position taper per channel. Designers should validate wiper resolution, channel count, and interface timing against the target application before committing to the substitution.
Channel Count
Validation required
Resolution (Positions per Channel)
Validation required
End-to-End Resistance
High match
Package Type
High match
Parts at a glance
Part B
AD8403ARU100
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5292 PCS
- Package
- TSSOP-24
- Series
- Data Acquisition - Digital Potentiometers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8402ARU10 | AD8403ARU100 | Why it matters |
|---|---|---|---|
| Number of Potentiometers | 2 | 4 | Determines how many independent digitally controlled resistance channels are available in a single package, directly affecting circuit channel count and board space. |
| Nominal Resistance | 10 kΩ | 100 kΩ | Sets the end-to-end resistance of each potentiometer, which governs the current draw and the usable resistance range in the application circuit. |
| Resolution | 8-bit (256 positions) | 8-bit (256 positions) | Defines the number of discrete wiper tap positions, which sets the achievable adjustment granularity of the resistance. |
| Digital Interface | SPI (3-wire serial) | SPI (3-wire serial) | Specifies the communication protocol used to program the wiper position, affecting microcontroller compatibility and firmware design. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Determines the operating voltage window and compatibility with the system power rail and logic levels. |
| Supply Current | 10 µA (typical) | 10 µA (typical) | Indicates quiescent power consumption, which is critical for battery-powered and low-power designs. |
| Package | TSSOP-14 | TSSOP-24 | Affects PCB footprint, layout, and assembly; different pin counts require different board designs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental conditions under which the device is guaranteed to operate within specification. |
| Wiper Resistance | ~50 Ω (typical) | ~50 Ω (typical) | Represents the series resistance of the wiper switch, which limits the minimum achievable resistance and affects accuracy at low settings. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8402ARU10 | AD8403ARU100 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 4 |
| Number of Taps | 256 | 256 |
| Resistance(Ohms) | 10k | 100k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Features | - | Cascade Pin |
| Tolerance | ±20% | ±30% |
| 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 AD8402ARU10 and AD8403ARU100?
The AD8402ARU10 is a dual-channel digital potentiometer with a 10 kΩ end-to-end resistance, while the AD8403ARU100 is a quad-channel device with a 100 kΩ end-to-end resistance. Both are offered in a 14-lead TSSOP package and use a 3-wire SPI-compatible serial interface, but they differ in channel count and nominal resistance.
How many potentiometer channels does each device provide?
The AD8402ARU10 provides two independently programmable potentiometer channels, whereas the AD8403ARU100 provides four independently programmable channels.
What is the nominal end-to-end resistance of each part?
The AD8402ARU10 has a nominal end-to-end resistance of 10 kΩ, and the AD8403ARU100 has a nominal end-to-end resistance of 100 kΩ.
What resolution do these digital potentiometers offer?
Both the AD8402ARU10 and AD8403ARU100 are 8-bit (256-position) digital potentiometers, providing 256 wiper settings per channel.
What serial interface do the AD8402ARU10 and AD8403ARU100 use?
Both devices use a 3-wire SPI-compatible serial interface consisting of clock, data input, and chip select lines for programming the wiper positions.
Are the AD8402ARU10 and AD8403ARU100 pin-to-pin compatible?
No. Although both are packaged in a 14-lead TSSOP, the AD8403ARU100 uses the additional pins for its two extra channels, so the pin functions and PCB layout requirements differ between the two parts.
What supply voltage range do these digital potentiometers support?
Both the AD8402ARU10 and AD8403ARU100 operate from a single supply in the 2.7 V to 5.5 V range, as specified in the Analog Devices datasheet.
Can the AD8402ARU10 be substituted directly for the AD8403ARU100 in an existing design?
No. The substitution is not direct because the AD8403ARU100 has four channels versus two on the AD8402ARU10, and the nominal resistance differs (100 kΩ versus 10 kΩ). Channel count, resistance, and pin configuration must all be validated against the target design before any replacement.