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 AD5251BRUZ10 are not drop-in replacements for one another. Although both are quad-channel digital potentiometers from the same AD525x family, they differ in end-to-end resistance, interface protocol, and volatile/nonvolatile memory architecture, requiring circuit redesign and firmware changes before substitution.
Different end-to-end resistance
Different digital interface
Different memory architecture
Different wiper resolution
Parts at a glance
Part B
AD5251BRUZ10
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 389 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 | AD5251BRUZ10 | Why it matters |
|---|---|---|---|
| Number of Positions | 256 | 64 | Resolution determines the number of adjustable steps; a 256-position device offers finer wiper adjustment than a 64-position device. |
| Number of Channels | 4 | 2 | Channel count defines how many independent resistance elements can be controlled in a single package. |
| End-to-End Resistance | 100 kΩ | 10 kΩ | Nominal resistance sets the impedance range of the potentiometer and must match the circuit's design requirements. |
| Interface Type | I²C | Up/Down (3-wire) | The digital control interface must be compatible with the host controller's available bus and protocol. |
| Nonvolatile Memory | Yes (EEPROM) | No | Nonvolatile storage retains the wiper setting across power cycles, which is critical for applications requiring a known startup state. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Operating voltage range must encompass the system supply to ensure proper device operation. |
| Resistance Tolerance | ±30% | ±30% | Tolerance affects the absolute accuracy of the end-to-end resistance, impacting circuit precision. |
| Package | 20-Lead TSSOP | 14-Lead TSSOP | Package footprint and pin count must match the PCB layout and available board space. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range must cover the application's environmental conditions for reliable operation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ100 | AD5251BRUZ10 |
|---|---|---|
| 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) | 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 AD5251BRUZ10?
The AD5254BRUZ100 is a quad-channel, 100 kΩ digital potentiometer with 256 positions and an I²C interface, while the AD5251BRUZ10 is a dual-channel, 10 kΩ digital potentiometer with 64 positions and an I²C interface. The AD5254 offers more channels, higher resolution, and a higher end-to-end resistance, whereas the AD5251 provides a lower resistance value and fewer positions in a smaller channel count.
Are the AD5254BRUZ100 and AD5251BRUZ10 pin-compatible?
No. The AD5254BRUZ100 is a 20-lead TSSOP (RU-20) package, while the AD5251BRUZ10 is a 14-lead TSSOP (RU-14) package. They have different pin counts and pinouts, so they are not pin-compatible and cannot be used as drop-in replacements without PCB redesign.
Can the AD5251BRUZ10 be used as a substitute for the AD5254BRUZ100 in an existing design?
No, not directly. The AD5251BRUZ10 has only two channels and 64 positions, whereas the AD5254BRUZ100 has four channels and 256 positions. A design requiring four independent potentiometers or finer resolution cannot be satisfied by the AD5251BRUZ10 without significant hardware and firmware changes.
What are the end-to-end resistance tolerances for these devices?
Both the AD5254BRUZ100 and AD5251BRUZ10 are specified with a nominal resistance tolerance of ±30% per the Analog Devices datasheets. The AD5254BRUZ100 has a 100 kΩ nominal end-to-end resistance, and the AD5251BRUZ10 has a 10 kΩ nominal end-to-end resistance.
Do both devices support the same digital interface and supply voltage range?
Yes. Both the AD5254BRUZ100 and AD5251BRUZ10 use a 2-wire I²C-compatible serial interface and operate from a single 2.7 V to 5.5 V supply. They also share similar logic-level thresholds and support standard-mode and fast-mode I²C clock rates up to 400 kHz.
What are the typical applications for each device?
The AD5254BRUZ100 is typically used in applications requiring multiple programmable resistance settings, such as quad-channel gain control, offset trimming, and programmable filters. The AD5251BRUZ10 is suited for dual-channel applications with lower resistance requirements, such as dual-channel volume control, sensor calibration, and low-voltage trim circuits.
Are the AD5254BRUZ100 and AD5251BRUZ10 available in the same operating temperature range?
Yes. Both devices are specified for the industrial temperature range of −40°C to +85°C, as stated in their respective Analog Devices datasheets.