Part A
AD8400ARZ1
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4740 Stückzahl
- Package
- SOIC-8
- Series
- Datenerfassung
Replacement verdict
Compatible functional replacement candidate
The AD8400ARZ1 and AD8400ARZ10 are both single-channel digital potentiometers from the AD8400 family in the same SOIC-8 package, sharing identical pinout, interface, and supply requirements. The only meaningful distinction is the end-to-end resistance (1 kΩ versus 10 kΩ), so the AD8400ARZ1 can serve as a functional substitute for the AD8400ARZ10 only where the circuit's gain, attenuation, or bias network is recalibrated for the lower resistance value.
End-to-End Resistance
Not compatible
Package Type
High match
Channel Count
High match
Digital Interface
High match
Parts at a glance
Part B
AD8400ARZ10
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5319 Stückzahl
- Package
- SOIC-8
- Series
- Datenerfassung
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8400ARZ10 | AD8400ARZ1 | Why it matters |
|---|---|---|---|
| End-to-End Resistance | 10 kΩ | 1 kΩ | The nominal resistance directly sets the current and signal range in the application; substituting a different value changes circuit gain, attenuation, or bias, so it is the primary substitutability criterion. |
| Number of Positions (Taps) | 256 | 256 | Tap count determines the resolution of the digital potentiometer; identical resolution means the same control granularity and step size behavior in firmware. |
| Number of Potentiometers per Package | 1 | 1 | The channel count must match the circuit topology; a single-channel device is directly interchangeable only with another single-channel device. |
| Digital Interface | SPI (3-wire serial) | SPI (3-wire serial) | The control interface must be compatible with the host controller; identical SPI interface allows the same firmware and wiring to be reused. |
| 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; matching ranges ensure the part works in the same power environment without level shifting. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Package and footprint compatibility determine whether the part can be dropped onto the same PCB land pattern without redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must satisfy the application environment; matching industrial ranges confirm equivalent environmental robustness. |
| Resistance Tolerance | ±20 % (typical for 10 kΩ option) | ±20 % (typical for 1 kΩ option) | Tolerance affects absolute accuracy of the set resistance; while both are ±20 %, the absolute deviation in ohms differs greatly between the 10 kΩ and 1 kΩ versions, impacting precision-sensitive designs. |
| Wiper Resistance | Approx. 50 Ω (typical) | Approx. 50 Ω (typical) | Wiper resistance adds a fixed series term; with a 1 kΩ end-to-end device the wiper resistance is a much larger fraction of total resistance, altering linearity and minimum achievable resistance compared to the 10 kΩ version. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8400ARZ1 | AD8400ARZ10 |
|---|---|---|
| Part Status | Active | Active |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 1 | 1 |
| Number of Taps | 256 | 256 |
| Resistance(Ohms) | 1k | 10k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±33% | ±20% |
| Temperature Coefficient(Typ) | 700ppm/°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 AD8400ARZ10 and AD8400ARZ1?
The primary difference is the end-to-end resistance value of the internal digital potentiometer. The AD8400ARZ10 provides a 10 kΩ nominal resistance, while the AD8400ARZ1 provides a 1 kΩ nominal resistance. Both are single-channel, 256-position digital potentiometers in an 8-lead SOIC package.
Are the AD8400ARZ10 and AD8400ARZ1 pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package and share the same pinout, including the serial interface, RDAC wiper, and terminal connections. This allows them to be used on the same PCB footprint, though the resistance value difference must be accounted for in the design.
What is the resolution and number of positions for these digital potentiometers?
Both the AD8400ARZ10 and AD8400ARZ1 are 256-position devices, providing 8-bit resolution. The wiper position is programmed through a serial SPI-compatible interface, allowing selection of any of the 256 discrete tap points along the resistor string.
What supply voltage range do the AD8400ARZ10 and AD8400ARZ1 support?
Both devices operate from a single supply voltage of 2.7 V to 5.5 V, making them suitable for low-voltage and mixed-signal systems. The digital interface is compatible with standard logic levels within this supply range.
How does the resistance value affect the application choice between the two parts?
The 10 kΩ AD8400ARZ10 is typically preferred where lower power consumption and higher resistance loading are acceptable, while the 1 kΩ AD8400ARZ1 is suited for applications requiring lower wiper resistance and higher current handling. The choice depends on the load impedance, power budget, and signal range of the target circuit.
What is the wiper resistance specification for these devices?
Both devices specify a typical wiper resistance of approximately 50 Ω (with a maximum specified in the datasheet). The lower end-to-end resistance of the AD8400ARZ1 means the wiper resistance represents a larger relative fraction of the total resistance, which should be considered in precision applications.
What is the operating temperature range for the AD8400ARZ10 and AD8400ARZ1?
Both devices are specified for operation over the industrial temperature range of −40°C to +85°C, as indicated by the "A" grade designation in the part number. This makes them suitable for industrial and commercial applications.
Can the AD8400ARZ10 and AD8400ARZ1 be used as drop-in replacements for each other?
They are pin-compatible and share the same package and interface, but they are not electrically identical due to the different end-to-end resistance values (10 kΩ vs. 1 kΩ). A direct substitution is only valid if the circuit's performance tolerates the resistance change; otherwise, the design must be re-evaluated against the datasheet specifications.