Part A
AD5254BRUZ10
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5455 PCS
- Package
- TSSOP-20
- Series
- Data Acquisition - Digital Potentiometers
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ10 and AD5251BRU10 differ fundamentally in channel count, interface protocol, and volatile/nonvolatile memory architecture, making them non-interchangeable in existing designs. The AD5254BRUZ10 offers four channels with I²C control and nonvolatile EEPROM wiper storage, while the AD5251BRU10 provides dual channels with increment/decrement interface and volatile wiper settings only. These architectural differences require complete circuit redesign and firmware modification, precluding direct substitution.
Different channel count
Different interface protocol
Different memory architecture
Different control method
Parts at a glance
Part B
AD5251BRU10
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4849 PCS
- Package
- TSSOP-14
- Series
- Data Acquisition - Digital Potentiometers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5254BRUZ10 | AD5251BRU10 | Why it matters |
|---|---|---|---|
| Number of Positions | 256 | 64 | Determines the resolution of the digital potentiometer; a higher number of positions allows finer adjustment of resistance. |
| Number of Potentiometers | 4 | 2 | Indicates how many independent variable resistors are integrated in one package, affecting channel count and board space. |
| End-to-End Resistance | 10 kΩ | 10 kΩ | Sets the nominal resistance range of the potentiometer, which must match the circuit's impedance requirements. |
| Interface Type | I²C | Up/Down (3-wire) | Defines the communication protocol used to control the device, affecting compatibility with the host controller. |
| Nonvolatile Memory | Yes (EEPROM) | No | Nonvolatile memory retains the wiper setting after power loss, which is critical for applications requiring a known startup state. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Specifies the operating voltage range; both devices must be powered within this range for proper operation. |
| Package Type | TSSOP-20 | TSSOP-14 | Affects PCB footprint and pin count; different packages are not drop-in replacements. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Ensures the device operates reliably within the intended environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ10 | AD5251BRU10 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 4 | 2 |
| Number of Taps | 256 | 64 |
| Resistance(Ohms) | 10k | 10k |
| 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% | ±20% |
| 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 AD5254BRUZ10 and AD5251BRU10?
The AD5254BRUZ10 is a quad-channel, 10 kΩ, 256-position I2C-compatible digital potentiometer in a 20-lead TSSOP package, while the AD5251BRU10 is a dual-channel, 10 kΩ, 64-position I2C-compatible digital potentiometer in a 14-lead TSSOP package. The AD5254 offers four independent channels with 256 positions per channel, whereas the AD5251 provides two channels with 64 positions per channel.
Are the AD5254BRUZ10 and AD5251BRU10 pin-to-pin compatible?
No. The AD5254BRUZ10 uses a 20-lead TSSOP package, and the AD5251BRU10 uses a 14-lead TSSOP package. They differ in pin count, pinout, and package footprint, so they are not pin-to-pin compatible and cannot be interchanged without PCB redesign.
Do both devices use the same digital interface?
Yes. Both the AD5254BRUZ10 and AD5251BRU10 use a 2-wire I2C-compatible serial interface for programming the wiper positions and reading back register contents.
What is the end-to-end resistance of the AD5254BRUZ10 and AD5251BRU10?
Both the AD5254BRUZ10 and AD5251BRU10 are 10 kΩ end-to-end resistance variants, as indicated by the "10" suffix in their part numbers.
How many wiper positions does each device provide?
The AD5254BRUZ10 provides 256 positions per channel (8-bit resolution), while the AD5251BRU10 provides 64 positions per channel (6-bit resolution). This difference affects the achievable wiper resolution and step size in each design.
Can the AD5251BRU10 be used as a drop-in replacement for the AD5254BRUZ10?
No. The AD5251BRU10 has fewer channels (2 vs. 4), lower wiper resolution (64 vs. 256 positions), and a different package (14-lead TSSOP vs. 20-lead TSSOP). A drop-in replacement is not possible without verifying channel count, resolution, and PCB layout requirements against the target design.
What are the typical applications for these digital potentiometers?
Both devices are used for digitally controlled resistance adjustment, such as gain and offset calibration, programmable filters, volume control, and power supply trimming. The AD5254BRUZ10 is suited for applications requiring four independent channels with finer 256-position resolution, while the AD5251BRU10 is suited for space-constrained designs needing two channels with 64-position resolution.