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 AD8402AR50 are both dual-channel digital potentiometers from the AD8402 family, sharing identical package, interface, and channel architecture, with the primary distinction being the end-to-end resistance value (10 kΩ versus 50 kΩ). Because the resistance value directly affects circuit behavior such as gain, attenuation, and current, the AD8402AR50 is a functional replacement candidate for the AD8402ARZ10 only when the surrounding circuit is redesigned or verified for the 50 kΩ end-to-end resistance; otherwise, validation of the resistance-dependent performance is required before substitution.
End-to-End Resistance
Not compatible
Channel Count
High match
Package Type
High match
Digital Interface
High match
Parts at a glance
Part B
AD8402AR50
ADI公司
- Lifecycle
- Active
- Stock
- 9595 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 | AD8402AR50 | Why it matters |
|---|---|---|---|
| End-to-End Resistance | 10 kΩ | 50 kΩ | Sets the nominal resistance range of the digital potentiometer; a direct substitute must match the circuit's designed resistance to preserve gain, attenuation, or bias levels. |
| Number of Positions | 256 | 256 | Determines the wiper resolution; identical tap count ensures the same step size and control granularity in the application. |
| Number of Channels | 2 | 2 | Defines how many independent potentiometers are in the package; matching channel count is required for pin-compatible substitution. |
| Interface Type | SPI (3-wire serial) | SPI (3-wire serial) | The digital control protocol must match the host controller; identical SPI interface allows drop-in firmware compatibility. |
| 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 ensure the device operates correctly in the same circuit. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Physical footprint and pinout must match for board-level interchangeability without layout changes. |
| Wiper Resistance | Approx. 50 Ω (typical) | Approx. 50 Ω (typical) | Wiper resistance adds to the set resistance and affects accuracy; similar values preserve the effective resistance seen by the load. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms the device meets the environmental requirements of the target application. |
| Bandwidth (-3 dB) | Higher (lower resistance) | Lower (higher resistance) | Bandwidth is inversely related to resistance; the 10 kΩ version supports higher signal frequencies than the 50 kΩ version, affecting AC performance. |
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 | AD8402AR50 |
|---|---|---|
| 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 | 50k |
| 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 main difference between the AD8402ARZ10 and the AD8402AR50?
The primary difference is the end-to-end resistance value of the internal digital potentiometer. The AD8402ARZ10 provides a 10 kΩ nominal resistance, while the AD8402AR50 provides a 50 kΩ nominal resistance. Both are dual-channel, 256-position digital potentiometers in the same SOIC-14 package.
Are the AD8402ARZ10 and AD8402AR50 pin-compatible?
Yes. Both devices are offered in the same 14-lead SOIC (R-14) package and share the same pinout, including the serial interface, address, and power supply pins. The difference is the internal resistor ladder value, not the package or pin assignment.
What is the resolution and number of positions for these devices?
Both the AD8402ARZ10 and AD8402AR50 are 8-bit (256-position) dual-channel digital potentiometers. Each channel provides 256 wiper positions selectable through the 3-wire SPI-compatible serial interface.
What supply voltage range do the AD8402ARZ10 and AD8402AR50 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. The digital interface is compatible with standard logic levels within this supply range.
How does the resistance value affect the choice between the AD8402ARZ10 and AD8402AR50?
The choice depends on the target circuit impedance and power budget. The 10 kΩ version (AD8402ARZ10) is typically used where lower resistance and higher current through the ladder are acceptable, while the 50 kΩ version (AD8402AR50) reduces quiescent current through the resistor ladder and suits higher-impedance signal paths. Selection should be validated against the application's loading and bandwidth requirements.
Do both parts use the same serial interface and control protocol?
Yes. Both the AD8402ARZ10 and AD8402AR50 use the same 3-wire SPI-compatible serial interface with a serial data input, clock, and chip select, and both support daisy-chain operation. The command structure and register map are identical; only the internal resistance value differs.
What are the typical applications for the AD8402ARZ10 and AD8402AR50?
Both devices are used for digital volume control, gain adjustment, offset trimming, and programmable filter or feedback networks. The AD8402ARZ10 is often preferred where a lower resistance value is needed, while the AD8402AR50 is used where higher resistance reduces power consumption in the resistor ladder.