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 AD5251BRU1 are not drop-in replacements for each other. The AD5254BRUZ10 is a quad-channel, 10 kΩ, I²C-compatible digital potentiometer in a 20-lead TSSOP, while the AD5251BRU1 is a dual-channel, 1 kΩ, I²C-compatible digital potentiometer in a 14-lead TSSOP. The differences in channel count, end-to-end resistance, package footprint, and wiper configuration prevent direct substitution without circuit redesign and firmware adaptation.
Different channel count
Different end-to-end resistance
Different package footprint
Different wiper configuration
Parts at a glance
Part B
AD5251BRU1
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9098 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 | AD5251BRU1 | Why it matters |
|---|---|---|---|
| Number of Positions | 1024 | 64 | Determines the resolution of the digital potentiometer; a higher number of positions allows finer adjustment of resistance. |
| Number of Taps | 256 | 64 | Defines the number of discrete resistance steps available, directly affecting the precision of the wiper setting. |
| Resistance Value | 10 kΩ | 10 kΩ | The nominal end-to-end resistance sets the range of resistance the device can provide in a circuit. |
| Interface Type | I²C | Up/Down (3-wire) | Determines how the device is controlled by a microcontroller or system; incompatible interfaces require different control logic. |
| Number of Potentiometers | 4 | 1 | Indicates how many independent variable resistors are integrated, affecting channel count and board space requirements. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the operating voltage window; both must be compatible with the system power rail for proper operation. |
| Package / Case | 14-TSSOP | 14-TSSOP | Physical footprint and pinout must match the PCB layout for a drop-in replacement. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Ensures the device functions reliably within the environmental conditions of the target application. |
| Nonvolatile Memory | Yes (EEPROM) | No | Determines whether the wiper setting is retained after power loss, which is critical for applications requiring preset resistance values on startup. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ10 | AD5251BRU1 |
|---|---|---|
| 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 | 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 AD5254BRUZ10 and AD5251BRU1?
The AD5254BRUZ10 is a quad-channel, 10 kΩ, 256-position I2C-compatible digital potentiometer in a 20-lead TSSOP package, while the AD5251BRU1 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 higher resolution (256 positions), whereas the AD5251 provides two channels with 64 positions.
Are the AD5254BRUZ10 and AD5251BRU1 pin-to-pin compatible?
No. The AD5254BRUZ10 uses a 20-lead TSSOP package, and the AD5251BRU1 uses a 14-lead TSSOP package. They have different pin counts and pinouts, so they are not pin-to-pin compatible and cannot be interchanged without PCB redesign.
Can the AD5251BRU1 be used as a direct substitute for the AD5254BRUZ10?
No. The AD5251BRU1 has only two channels and 64 positions per channel, while the AD5254BRUZ10 has four channels and 256 positions per channel. A direct substitution would require verifying channel count, resolution, package footprint, and register map compatibility against the target design requirements.
What is the end-to-end resistance of each device?
Both the AD5254BRUZ10 and AD5251BRU1 have a nominal end-to-end resistance of 10 kΩ, as indicated by the "10" and "1" suffixes in their respective part numbers when referenced against the manufacturer ordering guide. Designers should confirm the exact resistance tolerance grade from the official datasheet for the specific model.
What digital interface do the AD5254BRUZ10 and AD5251BRU1 use?
Both devices use a 2-wire I2C-compatible serial interface for programming the wiper positions and reading back stored values. The AD5254 supports up to four independent potentiometer channels over this bus, while the AD5251 supports two channels.
Do the AD5254BRUZ10 and AD5251BRU1 have nonvolatile memory for wiper settings?
Yes. Both the AD5254 and AD5251 families include nonvolatile EEPROM memory that stores the wiper settings, allowing the devices to retain their last programmed positions after power cycling. The exact EEPROM organization and number of storable wiper positions should be verified in the respective datasheets.
What are the typical operating voltage ranges for these digital potentiometers?
The AD5254 and AD5251 are designed to operate from a single supply or dual supplies, typically in the range of 2.7 V to 5.5 V for single-supply operation, with logic levels compatible with I2C buses. Designers must confirm the exact supply and logic voltage limits from the official Analog Devices datasheets for each specific model.
Which applications are better suited for the AD5254BRUZ10 versus the AD5251BRU1?
The AD5254BRUZ10 is better suited for applications requiring four independent digitally controlled resistance channels with finer 256-position adjustment, such as multi-channel gain and offset calibration. The AD5251BRU1 is more appropriate for space-constrained designs needing only two channels with 64-position resolution, such as simple dual-channel bias or volume control.