Part A
AD5254BRUZ100
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4724 Stückzahl
- Package
- TSSOP-20
- Series
- Datenerfassung
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ100 and AD5251BRU50-RL7 are not functionally interchangeable. The AD5254BRUZ100 is a quad-channel 100 kΩ digital potentiometer with I²C interface and nonvolatile memory, while the AD5251BRU50-RL7 is a dual-channel 50 kΩ device with a different control interface and reduced feature set. Differences in channel count, end-to-end resistance, interface protocol, and package configuration prevent direct substitution without circuit redesign.
Different channel count
Different end-to-end resistance
Different control interface
Different package configuration
Parts at a glance
Part B
AD5251BRU50-RL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7894 Stückzahl
- Package
- TSSOP-14
- Series
- Datenerfassung
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 | AD5251BRU50-RL7 | Why it matters |
|---|---|---|---|
| Number of Positions | 256 | 32 | Determines the adjustment resolution; a 256-position device offers finer wiper settings than a 32-position device. |
| Number of Potentiometers | 4 | 2 | Indicates how many independent resistor channels are available in a single package, affecting channel count in a design. |
| End-to-End Resistance | 100 kΩ | 50 kΩ | Sets the nominal resistance range and directly influences divider ratios, loading, and power consumption in the target circuit. |
| Interface Type | I²C | Up/Down (3-wire) | Determines the digital control protocol and pin count required to set the wiper position, affecting system architecture and firmware. |
| Nonvolatile Memory | Yes (EEPROM) | No | Nonvolatile storage retains the wiper setting across power cycles, eliminating the need to reprogram the device at startup. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the compatible logic and analog supply levels for the device in the system. |
| Package | 20-Lead TSSOP | 14-Lead TSSOP | Affects PCB footprint, pin count, and layout compatibility when substituting one part for the other. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures the device meets the thermal requirements of the intended application environment. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ100 | AD5251BRU50-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) | 100k | 50k |
| 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 AD5251BRU50-RL7 digital potentiometers?
The AD5254BRUZ100 is a quad-channel, 100 kΩ, 256-position digital potentiometer with I²C interface and nonvolatile memory, while the AD5251BRU50-RL7 is a dual-channel, 50 kΩ, 64-position digital potentiometer with I²C interface and nonvolatile memory. The AD5254 offers more channels, higher resolution, and higher end-to-end resistance, whereas the AD5251 provides fewer channels and lower resolution in a smaller configuration.
Are the AD5254BRUZ100 and AD5251BRU50-RL7 pin-compatible?
No. The AD5254BRUZ100 is supplied in a 20-lead TSSOP package, while the AD5251BRU50-RL7 is supplied in a 14-lead TSSOP package. The different pin counts and pinouts prevent direct pin-to-pin compatibility.
Can the AD5251BRU50-RL7 be used as a direct substitute for the AD5254BRUZ100?
No. The two devices differ in channel count (2 vs. 4), resolution (64 vs. 256 positions), end-to-end resistance (50 kΩ vs. 100 kΩ), and package size (14-lead vs. 20-lead TSSOP). A direct substitution is not possible without redesigning the circuit and validating all parameters against the target application requirements.
What is the resolution of each digital potentiometer?
The AD5254BRUZ100 provides 256 positions (8-bit resolution) per channel. The AD5251BRU50-RL7 provides 64 positions (6-bit resolution) per channel.
What are the end-to-end resistance values and tolerances for these devices?
The AD5254BRUZ100 has a nominal end-to-end resistance of 100 kΩ. The AD5251BRU50-RL7 has a nominal end-to-end resistance of 50 kΩ. Both devices are specified with a resistance tolerance as stated in their respective manufacturer datasheets; actual tolerance should be verified from the official Analog Devices documentation.
Do both devices include nonvolatile memory for wiper position storage?
Yes. Both the AD5254BRUZ100 and AD5251BRU50-RL7 include nonvolatile memory (EEPROM) that retains the wiper setting after power is removed, allowing the wiper position to be restored on power-up without reprogramming.
What digital interface do the AD5254BRUZ100 and AD5251BRU50-RL7 use?
Both devices use a 2-wire I²C-compatible serial interface for programming and reading back the wiper settings.
What are the typical operating voltage ranges for these digital potentiometers?
Both the AD5254BRUZ100 and AD5251BRU50-RL7 operate from a single supply or dual supplies, with specified operating voltage ranges defined in the Analog Devices datasheets. The AD5254 typically supports 2.7 V to 5.5 V single supply or ±2.5 V dual supply, and the AD5251 supports similar supply ranges. Exact limits should be confirmed from the official datasheets.