Part A
AD5254BRUZ100
ADI公司
- Lifecycle
- Active
- Stock
- 4724 件
- Package
- TSSOP-20
- Series
- 資料獲取-數位電位器
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ100 and AD5251BRU10-RL7 are not functionally interchangeable. They differ in channel count, interface protocol, and resolution, and the AD5251 is a nonvolatile device while the AD5254 is volatile. Board-level redesign and firmware changes would be required to substitute one for the other.
Different channel count
Different interface protocol
Different resolution
Different memory type
Parts at a glance
Part B
AD5251BRU10-RL7
ADI公司
- Lifecycle
- Active
- Stock
- 8102 件
- Package
- TSSOP-14
- Series
- 資料獲取-數位電位器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5254BRUZ100 | AD5251BRU10-RL7 | Why it matters |
|---|---|---|---|
| Number of Positions | 256 | 1024 | Determines the resolution of resistance adjustment; a 1024-position device offers finer wiper granularity than a 256-position device. |
| Number of Potentiometers | 4 | 2 | Indicates how many independent resistor channels are available in a single package, affecting board space and channel count requirements. |
| Nominal Resistance | 100 kΩ | 10 kΩ | Sets the end-to-end resistance of the potentiometer, which must match the impedance requirements of the surrounding circuit. |
| Interface Type | I²C | Up/Down (3-wire) | Determines the digital control protocol; I²C allows addressable multi-device buses while up/down requires dedicated control lines. |
| Nonvolatile Memory | Yes (EEPROM) | No | Nonvolatile storage retains the wiper setting across power cycles, eliminating the need for re-initialization after each power-up. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the compatible system power rails; both parts support the same low-voltage logic and analog supplies. |
| Package / Pin Count | 20-Lead TSSOP | 14-Lead TSSOP | Affects PCB footprint and layout; a 20-lead package occupies more board area than a 14-lead package. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Specifies the ambient temperature range over which the device is guaranteed to operate within datasheet limits. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ100 | AD5251BRU10-RL7 |
|---|---|---|
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 4 | 2 |
| Number of Taps | 256 | 64 |
| Resistance(Ohms) | 100k | 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 AD5254BRUZ100 and AD5251BRU10-RL7 digital potentiometers?
The AD5254BRUZ100 is a quad-channel, 100 kΩ, 256-position digital potentiometer with I²C interface and nonvolatile memory, housed in a 20-lead TSSOP package. The AD5251BRU10-RL7 is a dual-channel, 10 kΩ, 64-position digital potentiometer with I²C interface and nonvolatile memory, available in a 14-lead TSSOP package. Key differences include channel count (4 vs 2), end-to-end resistance (100 kΩ vs 10 kΩ), and resolution (256 positions vs 64 positions).
Are the AD5254BRUZ100 and AD5251BRU10-RL7 pin-compatible or package-compatible?
No. The AD5254BRUZ100 uses a 20-lead TSSOP package, while the AD5251BRU10-RL7 uses a 14-lead TSSOP package. They have different pin counts and pinouts, so they are not pin-to-pin or package-compatible replacements.
Can the AD5254BRUZ100 directly replace the AD5251BRU10-RL7 in an existing design?
No. The two devices differ in channel count, resistance value, resolution, and package footprint. A direct replacement is not possible without redesigning the PCB and verifying that the system can accommodate the different electrical and mechanical characteristics.
What is the end-to-end resistance tolerance for each device?
The AD5254BRUZ100 has a nominal end-to-end resistance of 100 kΩ, and the AD5251BRU10-RL7 has a nominal end-to-end resistance of 10 kΩ. Both devices are specified with a resistance tolerance as stated in their respective manufacturer datasheets; designers should consult the official Analog Devices datasheets for the exact tolerance values.
Do both devices support nonvolatile memory storage of wiper settings?
Yes. Both the AD5254BRUZ100 and AD5251BRU10-RL7 include nonvolatile memory (EEPROM) that allows the wiper position to be stored and restored after power cycling, as specified in their respective Analog Devices datasheets.
What digital interface do the AD5254BRUZ100 and AD5251BRU10-RL7 use?
Both devices use a 2-wire I²C-compatible serial interface for programming and reading back the wiper settings, as documented in their respective Analog Devices datasheets.
How do the operating voltage ranges of the AD5254BRUZ100 and AD5251BRU10-RL7 compare?
Both devices are specified for operation over a supply voltage range that supports typical 2.7 V to 5.5 V single-supply systems, as detailed in their respective Analog Devices datasheets. Designers should verify the exact specified range in the official datasheet for each part before use.
Which device offers higher resolution for wiper adjustment?
The AD5254BRUZ100 offers 256 wiper positions (8-bit resolution), while the AD5251BRU10-RL7 offers 64 wiper positions (6-bit resolution). Therefore, the AD5254BRUZ100 provides finer adjustment resolution.