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 AD8403ARU10 share the same 10 kΩ dual/quad digital potentiometer architecture, TSSOP-14 package, and SPI-compatible serial interface, making them functionally interchangeable in most designs. The primary distinction is channel count, so verify that the target application can accommodate the additional potentiometer channels of the AD8403ARU10 before substituting.
Channel Count
High match
Package Type
High match
Interface Type
High match
End-to-End Resistance
High match
Parts at a glance
Part B
AD8403ARU10
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7522 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 | AD8403ARU10 | Why it matters |
|---|---|---|---|
| Number of Potentiometers | 2 | 4 | Determines how many independent digitally controlled resistor channels are available in a single package, directly affecting circuit channel count and board space. |
| Resistance Value | 10 kΩ | 10 kΩ | Sets the end-to-end resistance of each potentiometer, which governs the current and signal range the device can handle in the target circuit. |
| Resolution | 8-bit (256 positions) | 8-bit (256 positions) | Defines the number of discrete wiper settings, which determines the achievable adjustment granularity and step size. |
| 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 compatibility with the system power rail and logic levels. |
| Package | TSSOP-14 | TSSOP-24 | Affects PCB footprint and layout; different pin counts mean the two parts are not drop-in footprint compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms the ambient temperature range over which the device is specified to operate reliably. |
| Wiper Settling / Bandwidth | ~600 kHz (10 kΩ, -3 dB) | ~600 kHz (10 kΩ, -3 dB) | Indicates the signal bandwidth the potentiometer can pass, which is critical for AC and signal-processing applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8402ARU10 | AD8403ARU10 |
|---|---|---|
| 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 | 10k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Features | - | Cascade Pin |
| 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 AD8402ARU10 and AD8403ARU10?
The AD8402ARU10 is a dual-channel digital potentiometer, while the AD8403ARU10 is a quad-channel device. Both are 10 kΩ, 256-position digital potentiometers from Analog Devices in a TSSOP-14 package, but the AD8403 provides four independent potentiometers versus two on the AD8402.
Are the AD8402ARU10 and AD8403ARU10 pin-compatible?
No. Although both are offered in a 14-lead TSSOP package, the AD8403ARU10 uses the additional pins to provide the third and fourth potentiometer terminals (A3, B3, W3, A4, B4, W4), so the pin functions differ and the devices are not drop-in replacements for one another.
What is the resistance value and resolution of these digital potentiometers?
Both the AD8402ARU10 and AD8403ARU10 have a nominal end-to-end resistance of 10 kΩ and provide 256 wiper positions (8-bit resolution), programmable over a 3-wire SPI-compatible serial interface.
What supply voltage range do the AD8402ARU10 and AD8403ARU10 support?
Both devices operate from a single supply of 2.7 V to 5.5 V, making them suitable for low-voltage digital control applications.
Can the AD8402ARU10 be used as a replacement for the AD8403ARU10 in an existing design?
Not directly. The AD8403ARU10 provides four potentiometers while the AD8402ARU10 provides only two, and their pinouts differ. A replacement would require redesign of the circuit and PCB layout to accommodate the reduced channel count and different pin functions.
What is the operating temperature range for these devices?
Both the AD8402ARU10 and AD8403ARU10 are specified for the industrial temperature range of −40 °C to +85 °C.
Do both parts use the same serial interface protocol?
Yes. Both the AD8402ARU10 and AD8403ARU10 use a 3-wire SPI-compatible serial interface (SDI, SCLK, and CS) for programming the wiper positions, though the AD8403 requires additional address bits to select among its four channels.