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 AD5251BRU1-RL7 are not functionally interchangeable. The AD5254BRUZ100 is a quad-channel 100 kΩ digital potentiometer with I²C interface and nonvolatile memory, while the AD5251BRU1-RL7 is a dual-channel 10 kΩ digital potentiometer with a different control interface and reduced feature set. Differences in channel count, end-to-end resistance, interface protocol, and package footprint prevent direct substitution without circuit redesign.
Different channel count
Different end-to-end resistance
Different control interface
Different package footprint
Parts at a glance
Part B
AD5251BRU1-RL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5078 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 | AD5251BRU1-RL7 | Why it matters |
|---|---|---|---|
| Number of Positions | 256 | 64 | Determines the wiper resolution; a 256-position device offers finer adjustment granularity than a 64-position device, affecting settability and accuracy. |
| Number of Channels | 4 | 2 | Indicates how many independent potentiometer channels are integrated; this directly affects board space and the number of signals that can be controlled. |
| End-to-End Resistance | 100 kOhm | 10 kOhm | Sets the nominal resistance range of the potentiometer, which must match the impedance requirements of the surrounding circuit for proper operation. |
| Interface Type | I2C | Up/Down (3-wire) | Defines the digital control protocol; I2C allows addressing multiple devices on a bus, while up/down requires dedicated control lines, affecting system architecture. |
| Nonvolatile Memory | Yes (EEPROM) | No | Nonvolatile storage retains the wiper setting through power cycles, eliminating the need for reinitialization after each power-up. |
| Package / Mounting | 20-TSSOP | 14-TSSOP | Package footprint and pin count affect PCB layout compatibility; a different package size may require board redesign for substitution. |
| 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 between the two parts. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings ensure both parts are suitable for the same industrial and commercial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ100 | AD5251BRU1-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 | 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 AD5254BRUZ100 and AD5251BRU1-RL7 digital potentiometers?
The AD5254BRUZ100 is a quad-channel, 100 kΩ, 256-position digital potentiometer with an I²C interface, while the AD5251BRU1-RL7 is a dual-channel, 10 kΩ, 64-position digital potentiometer with an up/down interface. They differ in channel count, end-to-end resistance, resolution, and control interface.
Are the AD5254BRUZ100 and AD5251BRU1-RL7 pin-compatible?
No. The AD5254BRUZ100 is offered in a 20-lead TSSOP package, whereas the AD5251BRU1-RL7 is supplied in a 14-lead TSSOP package. The different pin counts and pin functions prevent direct pin-to-pin compatibility.
Can the AD5251BRU1-RL7 be used as a drop-in replacement for the AD5254BRUZ100?
No. The two devices have different channel counts, resistance values, resolution, control interfaces, and package footprints. A direct drop-in replacement is not possible without redesigning the circuit and validating all parameters against the respective datasheets.
What are the supply voltage requirements for the AD5254BRUZ100 and AD5251BRU1-RL7?
Both devices operate from a single supply voltage range of 2.7 V to 5.5 V, and also support dual-supply operation of ±2.5 V. Designers should verify the exact operating conditions in the official manufacturer datasheets for each part.
What control interfaces do the AD5254BRUZ100 and AD5251BRU1-RL7 use?
The AD5254BRUZ100 uses a 2-wire I²C-compatible serial interface. The AD5251BRU1-RL7 uses a 3-wire up/down (increment/decrement) interface with chip select and direction control. These interfaces are not interchangeable.
How do the resolution and wiper positions compare between the AD5254BRUZ100 and AD5251BRU1-RL7?
The AD5254BRUZ100 provides 256 wiper positions (8-bit resolution) per channel. The AD5251BRU1-RL7 provides 64 wiper positions (6-bit resolution) per channel. The AD5254BRUZ100 therefore offers finer adjustment granularity.
What are the end-to-end resistance values of the AD5254BRUZ100 and AD5251BRU1-RL7?
The AD5254BRUZ100 has a nominal end-to-end resistance of 100 kΩ. The AD5251BRU1-RL7 has a nominal end-to-end resistance of 10 kΩ. These values are fixed per part number and cannot be interchanged without affecting circuit performance.
Do the AD5254BRUZ100 and AD5251BRU1-RL7 support nonvolatile memory storage of wiper settings?
Yes. Both devices include nonvolatile memory (EEPROM) that allows the wiper position to be stored and restored on power-up. The AD5254BRUZ100 stores settings for four channels, while the AD5251BRU1-RL7 stores settings for two channels.