Part A
AD8402ARZ100
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 1274 個数
- Package
- SOIC-14
- Series
- データ取得 - デジタルポテンショメータ
Replacement verdict
Compatible functional replacement candidate
The AD8402ARZ100 and AD8402AR50 are both dual-channel digital potentiometers from the same AD8402 family, sharing identical package, interface, and channel architecture. The primary distinction is the end-to-end resistance value (100 kΩ versus 50 kΩ), which directly affects the application's gain, attenuation, or bias range. The AD8402AR50 can serve as a functional substitute for the AD8402ARZ100 only where the circuit's resistance-dependent behavior is recalibrated or where the 50 kΩ value is acceptable; otherwise, validation of the resistance-critical network is required before substitution.
End-to-End Resistance
Not compatible
Package Type
High match
Channel Count
High match
Digital Interface
High match
Parts at a glance
Part B
AD8402AR50
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 9595 個数
- Package
- SOIC-14
- Series
- データ取得 - デジタルポテンショメータ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8402ARZ100 | AD8402AR50 | Why it matters |
|---|---|---|---|
| End-to-End Resistance | 100 kΩ | 50 kΩ | Determines the nominal resistance range of the digital potentiometer; a direct substitute must match the circuit's designed resistance value. |
| Number of Positions | 256 | 256 | Defines the wiper resolution; identical resolution ensures the same step size behavior in the application. |
| Number of Channels | 2 | 2 | Specifies how many independent potentiometers are in the package; must match the circuit's channel count. |
| Interface Type | SPI (3-wire serial) | SPI (3-wire serial) | Determines the digital communication protocol required by the host controller; must be compatible with the existing bus. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the operating voltage window; must be compatible with the system power rail. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Ensures the part fits the same PCB footprint and assembly process. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms the device meets the environmental requirements of the target application. |
| Wiper Resistance | Approx. 50 Ω (typical) | Approx. 50 Ω (typical) | Affects the minimum achievable resistance and signal attenuation; matching values preserves circuit behavior. |
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 | AD8402ARZ100 | 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) | 100k | 50k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±30% | ±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 AD8402ARZ100 and the AD8402AR50?
The primary difference is the end-to-end resistance value of the internal RDAC. The AD8402ARZ100 provides a 100 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 AD8402ARZ100 and AD8402AR50 pin-compatible?
Yes. Both devices are offered in the same 14-lead SOIC (R-14) package and share an identical pinout, including the two independent RDAC terminals (A1/B1/W1 and A2/B2/W2), the serial data interface pins (SDI, SDO, CLK, CS), and the supply and ground pins. They can occupy the same PCB footprint.
Do both parts use the same digital interface and resolution?
Yes. Both are 256-position (8-bit) digital potentiometers with a 3-wire SPI-compatible serial interface (SDI, SDO, CLK, CS). They support daisy-chaining via SDO and use the same command/address structure, so firmware written for one device is generally applicable to the other.
How does the resistance value affect the application circuit?
The end-to-end resistance sets the wiper resistance range and the current through the RDAC for a given applied voltage. The 100 kΩ version draws less current and suits lower-power or higher-impedance signal paths, while the 50 kΩ version provides lower impedance and can drive heavier loads or achieve different RC time constants. The chosen value should be matched to the surrounding circuit's impedance and current requirements.
What are the key AC and DC specifications shared by both devices?
Both devices operate from a single 2.7 V to 5.5 V supply, offer a nominal wiper resistance in the tens of ohms, and specify a typical bandwidth in the hundreds of kHz range that scales inversely with resistance. They also share the same temperature coefficient and integral/differential nonlinearity specifications per the manufacturer datasheet. Designers should confirm exact limits against the Analog Devices AD8402 datasheet for the specific resistance option.
Can the AD8402AR50 be used as a drop-in replacement for the AD8402ARZ100?
Physically and digitally, yes, since the package, pinout, and interface are identical. Electrically, it is not a direct substitute because the end-to-end resistance changes from 100 kΩ to 50 kΩ, which alters wiper current, load driving capability, and RC characteristics. The replacement should only be made after verifying that the new resistance value meets the circuit's performance requirements.
Are both parts RoHS compliant and available in the same packaging?
Yes. The "Z" suffix in AD8402ARZ100 denotes a RoHS-compliant lead-free finish, and the AD8402AR50 is also available in RoHS-compliant packaging from Analog Devices. Both are supplied in the 14-lead SOIC package and are available in tube and tape-and-reel formats. Buyers should confirm the specific ordering code and compliance status with the distributor or manufacturer datasheet.