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 AD8402AR1 are both dual-channel, 10 kΩ digital potentiometers from the AD8402 family in the same SOIC-14 package, sharing identical channel count, end-to-end resistance, and supply voltage range. The AD8402AR1 is a legacy non-RoHS version, while the AD8402ARZ10 is the current RoHS-compliant equivalent, making it a suitable functional replacement where lead-free compliance is required.
Channel Count
High match
End-to-End Resistance
High match
Package Type
High match
RoHS Compliance
Validation required
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 | AD8402AR1 | Why it matters |
|---|---|---|---|
| End-to-End Resistance | 10 kΩ | 1 kΩ | Sets the nominal resistance range of the digital potentiometer; a different value changes the current/voltage scaling in the circuit and is not a drop-in substitute. |
| Number of Potentiometers | 2 | 2 | Determines how many independent adjustable resistance channels are available in the package. |
| Resolution (Number of Taps) | 256 positions (8-bit) | 256 positions (8-bit) | Defines the step granularity of resistance adjustment; identical resolution means the same wiper positioning behavior. |
| Interface Type | SPI (3-wire serial) | SPI (3-wire serial) | The digital control protocol must match the host controller for the device to be usable in the same system. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Determines compatibility with the system power rail; matching ranges allow operation in the same supply environment. |
| Package / Mounting | 8-lead SOIC (surface mount) | 8-lead SOIC (surface mount) | Footprint and mounting style must match for physical board compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures the device meets the environmental requirements of the target application. |
| Wiper Resistance | Approximately 50 Ω (typical) | Approximately 50 Ω (typical) | Wiper resistance adds a fixed series term to the programmed resistance; similar values preserve the effective resistance accuracy. |
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 | AD8402AR1 |
|---|---|---|
| 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 | 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 | 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 AD8402ARZ10 and the AD8402AR1?
The AD8402ARZ10 is a dual-channel, 10 kΩ digital potentiometer in a 14-lead SOIC package (RoHS-compliant "Z" suffix). The AD8402AR1 is the same dual-channel AD8402 family device but with a 1 kΩ end-to-end resistance. Both share the same 256-position resolution, SPI-compatible serial interface, and 14-lead SOIC footprint; the primary difference is the nominal resistance value (10 kΩ vs. 1 kΩ).
Are the AD8402ARZ10 and AD8402AR1 pin-compatible?
Yes. Both devices are offered in the same 14-lead SOIC (R-14) package with identical pin functions, so they are pin-compatible. The difference is the internal resistor value, not the pinout.
Can the AD8402ARZ10 be used as a drop-in replacement for the AD8402AR1?
Not without design validation. Although pin-compatible, the 10 kΩ versus 1 kΩ end-to-end resistance changes the wiper resistance ratio, current through the potentiometer, and the resulting circuit behavior. The replacement should only be made after confirming the new resistance value meets the application's requirements against the manufacturer datasheet.
What is the resolution and number of positions for both devices?
Both the AD8402ARZ10 and AD8402AR1 are 256-position (8-bit) digital potentiometers with two independent channels, offering 256 wiper settings per channel via the serial interface.
What serial interface do the AD8402ARZ10 and AD8402AR1 use?
Both devices use a 3-wire SPI-compatible serial interface (SDI, SDO, and CLK) with a chip select (CS) line, allowing daisy-chaining and direct control from most microcontrollers.
What supply voltage range do the AD8402ARZ10 and AD8402AR1 support?
Both devices operate from a single supply of 2.7 V to 5.5 V, making them suitable for low-voltage digital systems. Verify the exact limits in the respective manufacturer datasheet before design.
Does the "Z" suffix on the AD8402ARZ10 indicate RoHS compliance?
Yes. The "Z" suffix in the Analog Devices part numbering denotes a RoHS-compliant, lead-free package. The AD8402AR1 designation does not carry this suffix, so its RoHS status should be confirmed from the specific ordering code and datasheet.