Part A
AD8400ARZ1
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4740 Stückzahl
- Package
- SOIC-8
- Series
- Datenerfassung
Replacement verdict
Not a drop-in replacement
The AD8400ARZ1 and AD8402AR50 are not drop-in replacements for each other. The AD8400ARZ1 is a single-channel digital potentiometer with a 1 kΩ end-to-end resistance in an 8-lead SOIC package, while the AD8402AR50 is a dual-channel device with a 50 kΩ end-to-end resistance in a 14-lead SOIC package. The differences in channel count, resistance value, and package footprint make them functionally incompatible for direct substitution without circuit redesign.
Different channel count
Different resistance value
Different footprint
Different package pinout
Parts at a glance
Part B
AD8402AR50
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9595 Stückzahl
- Package
- SOIC-14
- 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 | AD8400ARZ1 | AD8402AR50 | Why it matters |
|---|---|---|---|
| Number of Resistor Channels | 1 | 2 | Determines how many independent programmable resistance paths are available in the system; a single-channel part cannot replace a dual-channel part without redesign. |
| Nominal End-to-End Resistance | 1 kΩ | 50 kΩ | Sets the resistance range and current/power handling of the digital potentiometer; a large mismatch changes circuit gain, attenuation, or bias levels. |
| Resolution (Number of Positions) | 256 positions (8-bit) | 256 positions (8-bit) | Defines the step granularity of resistance adjustment; both share 8-bit resolution, so wiper step count is equivalent. |
| Digital Interface | 3-wire SPI-compatible serial | 3-wire SPI-compatible serial | Determines how the host controller programs the device; matching interfaces simplifies firmware and bus compatibility. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Must match the system rail; both support the same single-supply range, easing power design substitution. |
| Package Type | 8-lead SOIC | 14-lead SOIC | Affects PCB footprint and pin count; different packages require layout changes and cannot be drop-in substituted. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms suitability for industrial temperature environments; identical ranges mean equivalent thermal robustness. |
| Wiper Resistance | Approximately 50 Ω (typical) | Approximately 50 Ω (typical) | Adds series error to the programmed resistance; similar wiper resistance keeps end-to-end accuracy comparable. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8400ARZ1 | AD8402AR50 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 1 | 2 |
| Number of Taps | 256 | 256 |
| Resistance(Ohms) | 1k | 50k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±33% | ±30% |
| 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 are the key differences between the AD8400ARZ1 and the AD8402AR50?
The AD8400ARZ1 is a single-channel, 1 kΩ digital potentiometer in an 8-lead SOIC package, while the AD8402AR50 is a dual-channel, 50 kΩ digital potentiometer in a 14-lead SOIC package. They differ in number of channels, end-to-end resistance, package size, and pin count.
Are the AD8400ARZ1 and AD8402AR50 pin-compatible?
No. The AD8400ARZ1 uses an 8-lead SOIC package and the AD8402AR50 uses a 14-lead SOIC package, so they have different pin counts and land patterns and cannot be treated as pin-compatible.
What is the end-to-end resistance of each device?
The AD8400ARZ1 has a 1 kΩ end-to-end resistance, and the AD8402AR50 has a 50 kΩ end-to-end resistance. The resistance value is indicated by the suffix in each part number.
How many potentiometer channels does each part provide?
The AD8400ARZ1 provides one single-channel digital potentiometer, while the AD8402AR50 provides two independent channels in a single package.
Do both parts use the same digital interface?
Both are members of the AD8400/AD8402/AD8403 family and use a 3-wire SPI-compatible serial interface for setting the wiper position. The interface protocol is common across the family, but the channel count and resistance differ.
Can the AD8400ARZ1 be used as a drop-in replacement for the AD8402AR50?
No. The AD8400ARZ1 is single-channel with 1 kΩ resistance in an 8-lead package, whereas the AD8402AR50 is dual-channel with 50 kΩ resistance in a 14-lead package. Channel count, resistance, and package differences prevent a direct drop-in replacement without design changes.
What supply voltage range do these digital potentiometers support?
Both the AD8400ARZ1 and AD8402AR50 operate from a single 2.7 V to 5.5 V supply, consistent with the AD8400/AD8402/AD8403 family specifications.