Part A
AD8402ARZ10
ADI公司
- Lifecycle
- Active
- Stock
- 6644 件
- Package
- SOIC-14
- Series
- 資料獲取-數位電位器
Replacement verdict
Compatible functional replacement candidate
The AD8402ARZ10 and AD8402AR100 are both dual-channel, 8-bit digital potentiometers in the same SOIC-14 package and share identical interface, supply, and temperature specifications, differing only in end-to-end resistance (10 kΩ vs 100 kΩ). They are functionally interchangeable where the circuit's resistance value and divider ratio requirements can accommodate the tenfold resistance difference; designers must validate the impact on gain, current, and RC time constants before substituting.
Resolution and Channel Count
High match
Package Type
High match
Digital Interface
High match
End-to-End Resistance
Validation required
Parts at a glance
Part B
AD8402AR100
ADI公司
- Lifecycle
- Active
- Stock
- 6475 件
- Package
- SOIC-14
- Series
- 資料獲取-數位電位器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8402ARZ10 | AD8402AR100 | Why it matters |
|---|---|---|---|
| End-to-End Resistance | 10 kΩ | 100 kΩ | The total resistance sets the current and signal range the digital potentiometer presents to the surrounding circuit; substituting a different value changes gain, attenuation, and loading. |
| Number of Resistor Taps | 256 | 256 | Tap count determines the wiper resolution; identical resolution means the same number of discrete steps is available in both parts. |
| Number of Potentiometers | 2 | 2 | The channel count must match the circuit's requirement for independent adjustable resistance elements. |
| Digital Interface | SPI (3-wire serial) | SPI (3-wire serial) | The control interface must be compatible with the host controller's bus for the device to be functionally interchangeable. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | The operating supply range must cover the system rail to ensure correct operation and signal headroom. |
| Supply Current | 10 µA (typical) | 10 µA (typical) | Quiescent current affects power budget, especially in low-power or battery-operated designs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must satisfy the application environment for reliable operation. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Matching package and footprint allows drop-in replacement without PCB redesign. |
| Wiper Resistance | ~50 Ω (typical) | ~100 Ω (typical) | Wiper resistance adds a series error to the programmed resistance; a higher value reduces accuracy and usable range at low tap 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 | AD8402ARZ10 | AD8402AR100 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 2 |
| 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 |
| 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 is the primary difference between the AD8402ARZ10 and the AD8402AR100?
The primary difference is the end-to-end resistance value of the internal RDAC. The AD8402ARZ10 provides a 10 kΩ nominal resistance, while the AD8402AR100 provides a 100 kΩ nominal resistance. Both are dual-channel, 256-position digital potentiometers in a 14-lead SOIC package.
Are the AD8402ARZ10 and AD8402AR100 pin-compatible?
Yes. Both devices are offered in the same 14-lead SOIC (R-14) package and share the same pinout, including the 3-wire SPI-compatible serial interface, VDD, DGND, AGND, and the two independent A/B/W terminal sets. They can occupy the same PCB footprint, but the resistance value difference must be evaluated for the application.
Do both parts have the same number of programmable positions and interface?
Yes. Both the AD8402ARZ10 and AD8402AR100 are dual-channel, 256-position digital potentiometers controlled via a 3-wire SPI-compatible serial interface. Each channel provides 256 wiper settings (8-bit resolution) and includes a power-on preset to midscale.
How does the resistance value affect power consumption and current handling?
The 100 kΩ AD8402AR100 draws less current through the RDAC for a given applied voltage than the 10 kΩ AD8402ARZ10, following Ohm's law (I = V/R). Conversely, the 10 kΩ version can sink/source more current through the wiper and terminals. The datasheet-specified maximum wiper current and power dissipation limits must be observed for both variants.
Can the AD8402ARZ10 be replaced by the AD8402AR100 in an existing design?
Not without validation. Although pin-compatible, the tenfold resistance difference changes the circuit's transfer function, current levels, and RC time constants. A replacement is only appropriate after confirming that the new resistance value meets the design's gain, attenuation, or timing requirements per the manufacturer datasheet.
What supply voltage range do both devices support?
Both the AD8402ARZ10 and AD8402AR100 operate from a single supply of 2.7 V to 5.5 V, as specified in the Analog Devices datasheet. The digital interface levels and RDAC performance should be evaluated against the chosen supply voltage.
Do both parts share the same temperature range and packaging qualification?
Yes. Both are specified over the industrial temperature range of −40 °C to +85 °C and are supplied in the 14-lead SOIC package. The "Z" suffix in AD8402ARZ10 denotes RoHS-compliant lead-free construction, consistent with the AD8402AR100 ordering variant.