Part A
AD5254BRUZ50
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 2128 PCS
- Package
- TSSOP-20
- Series
- 데이터 수집 - 디지털 전위기
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ50 and AD5251BRU10-RL7 are not functionally interchangeable. They differ in channel count, nominal resistance, interface protocol, and nonvolatile memory architecture, so direct substitution is not feasible without a complete circuit and firmware redesign.
Different channel count
Different resistance value
Different interface protocol
Different memory architecture
Parts at a glance
Part B
AD5251BRU10-RL7
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 8102 PCS
- Package
- TSSOP-14
- Series
- 데이터 수집 - 디지털 전위기
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 | AD5251BRU10-RL7 | Why it matters |
|---|---|---|---|
| Number of Positions | 256 | 1024 | Determines the resolution of the digital potentiometer; a higher number of positions allows finer adjustment of resistance. |
| Number of Taps | 256 | 1024 | Directly related to the number of positions and affects the step size between resistance settings. |
| Resistance Value | 50 kΩ | 10 kΩ | The end-to-end resistance must match the circuit's design requirements for proper signal level and current handling. |
| Interface Type | I²C | SPI | The communication protocol must be compatible with the host controller; I²C and SPI are not interchangeable without hardware or software changes. |
| Number of Potentiometers | 4 | 2 | Determines how many independent resistance channels are available in a single package, affecting board space and channel count. |
| Package / Case | 20-TSSOP | 14-TSSOP | Physical footprint and pin count must match the PCB layout; different packages are not drop-in compatible. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Both devices operate over the same supply range, so power supply compatibility is maintained. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Both parts support the same industrial temperature range, ensuring environmental compatibility. |
| Nonvolatile Memory | Yes (EEPROM) | Yes (EEPROM) | Both retain the wiper setting after power loss, which is important for applications requiring a known startup state. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ50 | AD5251BRU10-RL7 |
|---|---|---|
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 4 | 2 |
| Number of Taps | 256 | 64 |
| Resistance(Ohms) | 50k | 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 AD5254BRUZ50 and AD5251BRU10-RL7 digital potentiometers?
The AD5254BRUZ50 is a quad-channel, 256-position digital potentiometer with a 50 kΩ end-to-end resistance, while the AD5251BRU10-RL7 is a dual-channel, 64-position digital potentiometer with a 10 kΩ end-to-end resistance. The AD5254 offers more channels and higher resolution, whereas the AD5251 provides a lower resistance value and smaller channel count.
Are the AD5254BRUZ50 and AD5251BRU10-RL7 pin-compatible?
No. The AD5254BRUZ50 is supplied in a 20-lead TSSOP package, and the AD5251BRU10-RL7 is supplied in a 14-lead TSSOP package. The different pin counts and pinouts prevent direct PCB footprint compatibility.
What is the resolution of each device?
The AD5254BRUZ50 provides 256 positions (8-bit resolution) per channel. The AD5251BRU10-RL7 provides 64 positions (6-bit resolution) per channel.
What are the end-to-end resistance values and tolerances?
The AD5254BRUZ50 has a nominal 50 kΩ end-to-end resistance. The AD5251BRU10-RL7 has a nominal 10 kΩ end-to-end resistance. Both devices are specified with a ±20% resistance tolerance according to their respective datasheets.
How many channels does each digital potentiometer provide?
The AD5254BRUZ50 integrates four independent digitally controlled potentiometers. The AD5251BRU10-RL7 integrates two independent digitally controlled potentiometers.
What digital interface do these devices use?
Both the AD5254BRUZ50 and AD5251BRU10-RL7 use a 2-wire I²C-compatible serial interface for programming and control.
Can the AD5251BRU10-RL7 be used as a drop-in replacement for the AD5254BRUZ50?
No. The devices differ in channel count, resolution, end-to-end resistance, package size, and pinout. A direct drop-in replacement is not possible without redesigning the circuit and PCB layout.
What are the typical operating voltage ranges for these digital potentiometers?
Both the AD5254BRUZ50 and AD5251BRU10-RL7 operate from a single supply voltage range of 2.7 V to 5.5 V, or from dual supplies of ±2.5 V to ±2.7 V, as specified in the Analog Devices datasheets.