Part A
AD5254BRUZ10
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5455 PCS
- Package
- TSSOP-20
- Series
- Acquisition de données - potentiomètres numériques
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ10 and AD5251BRUZ100 are not functionally interchangeable. 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 modification before substitution.
Different end-to-end resistance
Different interface protocol
Different memory architecture
Different wiper resolution
Parts at a glance
Part B
AD5251BRUZ100
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8797 PCS
- Package
- TSSOP-14
- Series
- Acquisition de données - potentiomètres numériques
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5254BRUZ10 | AD5251BRUZ100 | Why it matters |
|---|---|---|---|
| Number of Positions | 1024 | 64 | Determines the resolution of resistance adjustment; a higher position count allows finer wiper settings. |
| Number of Potentiometers | 4 | 2 | Indicates how many independent channels are available in a single package, affecting board space and channel count. |
| End-to-End Resistance | 10 kΩ | 100 kΩ | Sets the nominal resistance range and directly impacts the current and voltage levels in the application circuit. |
| Interface Type | I²C | Up/Down (3-wire) | Determines the digital communication protocol required by the host controller for wiper control. |
| Wiper Resistance | 200 Ω (typical) | 200 Ω (typical) | Adds a fixed series resistance at the wiper terminal, affecting accuracy especially at low resistance settings. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the compatible power supply rails for the device in the target system. |
| Nonvolatile Memory | Yes (EEPROM) | Yes (EEPROM) | Allows the wiper setting to be retained across power cycles without reprogramming. |
| Package Type | 20-Lead TSSOP | 14-Lead TSSOP | Affects PCB footprint, pin count, and thermal characteristics for layout and assembly. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Specifies the environmental conditions under which the device is guaranteed to operate reliably. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ10 | AD5251BRUZ100 |
|---|---|---|
| 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) | 10k | 100k |
| 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 AD5254BRUZ10 and AD5251BRUZ100?
The AD5254BRUZ10 is a quad-channel, 10 kΩ digital potentiometer with 256 positions and nonvolatile memory, while the AD5251BRUZ100 is a dual-channel, 100 kΩ digital potentiometer with 64 positions and nonvolatile memory. The AD5254 offers more channels and higher resolution, whereas the AD5251 provides a higher end-to-end resistance.
Are the AD5254BRUZ10 and AD5251BRUZ100 pin-compatible?
No. The AD5254BRUZ10 is supplied in a 20-lead TSSOP (RU-20) package, and the AD5251BRUZ100 is supplied in a 14-lead TSSOP (RU-14) package. The different pin counts and pinouts prevent direct PCB footprint compatibility.
What is the resolution of each device?
The AD5254BRUZ10 has 256 positions (8-bit resolution) per channel. The AD5251BRUZ100 has 64 positions (6-bit resolution) per channel.
How many potentiometer channels does each device provide?
The AD5254BRUZ10 integrates four independent digitally controlled potentiometers. The AD5251BRUZ100 integrates two independent digitally controlled potentiometers.
What are the end-to-end resistance values of these parts?
The AD5254BRUZ10 has a nominal end-to-end resistance of 10 kΩ. The AD5251BRUZ100 has a nominal end-to-end resistance of 100 kΩ.
Do both devices include nonvolatile memory for wiper settings?
Yes. Both the AD5254BRUZ10 and AD5251BRUZ100 include nonvolatile EEPROM memory that retains the wiper position after power-down, allowing the devices to power up in a known state.
What digital interface do the AD5254BRUZ10 and AD5251BRUZ100 use?
Both devices use a 2-wire I²C-compatible serial interface for programming and reading back the wiper settings.
Can the AD5251BRUZ100 be used as a drop-in replacement for the AD5254BRUZ10?
No. The AD5251BRUZ100 has fewer channels (2 vs. 4), lower resolution (64 vs. 256 positions), a different end-to-end resistance (100 kΩ vs. 10 kΩ), and a different package (14-lead TSSOP vs. 20-lead TSSOP). A direct drop-in replacement is not possible without redesign.