Part A
AD5254BRUZ50
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2128 PCS
- Package
- TSSOP-20
- Series
- Acquisição de dados - Potenciômetros Digitais
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ50 and AD5251BRU1-RL7 are not functionally interchangeable. They differ in channel count, interface protocol, and nonvolatile memory architecture, requiring circuit redesign and firmware modification before substitution can be considered.
Different channel count
Different interface protocol
Different memory architecture
Different package type
Parts at a glance
Part B
AD5251BRU1-RL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5078 PCS
- Package
- TSSOP-14
- Series
- Acquisição de dados - Potenciômetros Digitais
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5254BRUZ50 | AD5251BRU1-RL7 | Why it matters |
|---|---|---|---|
| Number of Positions | 256 | 64 | Resolution determines the number of adjustable steps; a 256-position device offers finer wiper adjustment than a 64-position device. |
| Number of Potentiometers | 4 | 2 | The count of independent resistor channels affects how many separate resistance settings can be controlled in a design. |
| End-to-End Resistance | 50 kΩ | 10 kΩ | Nominal resistance must match the circuit's impedance requirements for proper signal or bias level control. |
| Interface Type | I²C | Up/Down (3-wire) | The digital control interface must be compatible with the host controller's available bus or GPIO scheme. |
| Nonvolatile Memory | Yes (EEPROM) | No | Nonvolatile storage retains the wiper setting across power cycles, which is essential for applications requiring a remembered state. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Operating voltage range must encompass the system supply to ensure reliable operation. |
| Package / Mounting | 20-TSSOP (Surface Mount) | 14-TSSOP (Surface Mount) | Package footprint and pin count affect PCB layout and whether a drop-in replacement is possible. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range must cover the application's environmental conditions for guaranteed 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 | AD5254BRUZ50 | AD5251BRU1-RL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 4 | 2 |
| Number of Taps | 256 | 64 |
| Resistance(Ohms) | 50k | 1k |
| Interface | I²C | I²C |
| Memory Type | Non-Volatile | Non-Volatile |
| Voltage - Supply | 2.7V ~ 5.5V, ±2.25V ~ 2.75V | 2.7V ~ 5.5V, ±2.25V ~ 2.75V |
| Features | Selectable Address | Selectable Address |
| Tolerance | ±20% | ±30% |
| Temperature Coefficient(Typ) | 650ppm/°C | 650ppm/°C |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What are the key differences between the AD5254BRUZ50 and the AD5251BRU1-RL7?
The AD5254BRUZ50 is a quad-channel, 256-position digital potentiometer with a 50 kΩ end-to-end resistance, offered in a 20-lead TSSOP package. The AD5251BRU1-RL7 is a dual-channel, 64-position digital potentiometer with a 1 kΩ end-to-end resistance, supplied in a 14-lead TSSOP package and delivered in tape-and-reel format. They differ in channel count, resolution, resistance value, and package pin count.
Are the AD5254BRUZ50 and AD5251BRU1-RL7 pin-to-pin compatible?
No. The AD5254BRUZ50 uses a 20-lead TSSOP package, while the AD5251BRU1-RL7 uses a 14-lead TSSOP package. The different pin counts and pinouts prevent direct PCB footprint compatibility.
Can the AD5251BRU1-RL7 be used as a drop-in replacement for the AD5254BRUZ50?
No. Beyond package and pinout differences, the AD5254BRUZ50 provides four 256-position channels at 50 kΩ, whereas the AD5251BRU1-RL7 provides two 64-position channels at 1 kΩ. Channel count, resolution, and resistance value must all be validated against the target circuit requirements before any substitution.
What is the resolution of each digital potentiometer?
The AD5254BRUZ50 has 256 positions per channel, providing 8-bit resolution. The AD5251BRU1-RL7 has 64 positions per channel, providing 6-bit resolution.
What end-to-end resistance values are available for these parts?
The AD5254BRUZ50 is specified with a 50 kΩ end-to-end resistance. The AD5251BRU1-RL7 is specified with a 1 kΩ end-to-end resistance. These values are fixed by the specific part number ordering options.
How many potentiometer channels does each device integrate?
The AD5254BRUZ50 integrates four independent digitally controlled potentiometer channels. The AD5251BRU1-RL7 integrates two independent digitally controlled potentiometer channels.
What communication interface do these digital potentiometers use?
Both the AD5254BRUZ50 and the AD5251BRU1-RL7 use a 2-wire I²C-compatible serial interface for programming the wiper positions.
What are the package and packaging differences between the two parts?
The AD5254BRUZ50 is housed in a 20-lead TSSOP package. The AD5251BRU1-RL7 is housed in a 14-lead TSSOP package and is supplied in tape-and-reel packaging, as indicated by the RL7 suffix.