Part A
AD5254BRUZ100
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4724 PCS
- Package
- TSSOP-20
- Series
- Acquisição de dados - Potenciômetros Digitais
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ100 and AD5251BRU1 are not drop-in replacements for each other. The AD5254BRUZ100 is a quad-channel 100 kΩ digital potentiometer with I²C interface and nonvolatile memory, while the AD5251BRU1 is a dual-channel 1 kΩ digital potentiometer with a different control interface and package. Designers must account for differences in channel count, end-to-end resistance, interface type, and package footprint before considering any substitution.
Different channel count
Different end-to-end resistance
Different control interface
Different package footprint
Parts at a glance
Part B
AD5251BRU1
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9098 PCS
- Package
- TSSOP-14
- Series
- Acquisição de dados - Potenciômetros Digitais
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 | Why it matters |
|---|---|---|---|
| Number of Resistors / Channels | 4 | 2 | Determines how many independent potentiometer channels are available in the design; a 4-channel part cannot be directly substituted by a 2-channel part without redesign. |
| End-to-End Resistance | 100 kΩ | 10 kΩ | The nominal resistance directly affects the current and voltage range of the potentiometer circuit, so a different value changes circuit behavior. |
| Resolution (Number of Positions) | 256 positions (8-bit) | 64 positions (6-bit) | Higher resolution provides finer adjustment steps; substituting a lower-resolution device reduces the achievable precision of the setting. |
| Digital Interface | I²C | Up/Down (increment/decrement) interface | The control interface must match the host controller; I²C and up/down interfaces are not pin- or protocol-compatible. |
| Nonvolatile Memory (EEPROM) | Yes, stores wiper setting | No | Nonvolatile storage preserves the wiper position across power cycles, which is essential for applications requiring a remembered setting. |
| 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. |
| Package | 20-lead TSSOP | 14-lead TSSOP | Different package footprints and pin counts prevent drop-in board replacement without layout changes. |
| Operating Temperature Range | −40 °C to +85 °C | −40 °C to +85 °C | Matching temperature ranges ensure both parts are suitable for the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ100 | AD5251BRU1 |
|---|---|---|
| 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 | 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 the AD5251BRU1?
The AD5254BRUZ100 is a quad-channel, 100 kΩ, 256-position digital potentiometer with an I²C interface, while the AD5251BRU1 is a dual-channel, 1 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 pin-compatible?
No. The AD5254BRUZ100 is supplied in a 14-lead TSSOP package, whereas the AD5251BRU1 is supplied in a 14-lead TSSOP package but with a different pinout due to different channel counts and interface types. They are not pin-compatible and cannot be used as drop-in replacements.
Can the AD5254BRUZ100 and AD5251BRU1 operate from the same supply voltage?
Yes. Both devices operate from a single 2.7 V to 5.5 V supply, or from dual ±2.5 V supplies, making them compatible with common 3 V and 5 V logic systems.
What is the resolution of each device?
The AD5254BRUZ100 provides 256 positions (8-bit resolution) per channel. The AD5251BRU1 provides 64 positions (6-bit resolution) per channel.
How many potentiometer channels does each device integrate?
The AD5254BRUZ100 integrates four independent digitally controlled potentiometers. The AD5251BRU1 integrates two independent digitally controlled potentiometers.
What control interfaces do these digital potentiometers use?
The AD5254BRUZ100 uses a 2-wire I²C-compatible serial interface. The AD5251BRU1 uses a 3-wire up/down (increment/decrement) interface with a chip select input.
Do both devices offer nonvolatile wiper memory?
Yes. Both the AD5254BRUZ100 and AD5251BRU1 include nonvolatile EEPROM memory that retains the wiper setting after power is removed, allowing the wiper position to be restored on power-up.
What are the typical end-to-end resistance values for these parts?
The AD5254BRUZ100 has a 100 kΩ end-to-end resistance. The AD5251BRU1 has a 1 kΩ end-to-end resistance. These values are fixed per part number and cannot be interchanged without affecting circuit performance.
Which device is better suited for applications requiring multiple independent channels?
The AD5254BRUZ100 is better suited for multi-channel applications because it provides four independent potentiometers in a single package, whereas the AD5251BRU1 provides only two channels.