Part A
AD5254BRUZ100
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4724 ПКС
- Package
- TSSOP-20
- Series
- Сбор данных - цифровые потенциометры
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ100 and AD5251BRUZ1 are not functionally interchangeable. Although both are single-supply digital potentiometers from the same AD525x family, they differ fundamentally in channel count, nominal resistance, interface protocol, and volatile/nonvolatile memory behavior. The AD5254BRUZ100 provides four independent 100 kΩ channels with an I²C-compatible 2-wire interface and nonvolatile EEPROM wiper storage, while the AD5251BRUZ1 offers only two 1 kΩ channels with a 3-wire up/down interface and volatile wiper settings. These architectural differences prevent direct substitution without redesign of the control interface, resistance network, and power-on initialization strategy.
Different channel count
Different nominal resistance
Different control interface
Different memory behavior
Parts at a glance
Part B
AD5251BRUZ1
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3167 ПКС
- Package
- TSSOP-14
- Series
- Сбор данных - цифровые потенциометры
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 | AD5251BRUZ1 | 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 Potentiometers | 4 | 2 | The count of independent channels affects how many separate resistance settings can be controlled in one package. |
| End-to-End Resistance | 100 kΩ | 1 kΩ | Nominal resistance sets the usable resistance range and must match the circuit's impedance requirements for proper substitution. |
| Interface Type | I²C | Up/Down (3-wire) | The digital control interface must be compatible with the host controller; I²C and up/down interfaces are not directly interchangeable. |
| 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 must match the system supply rails to ensure correct logic levels and analog performance. |
| Package | 20-Lead TSSOP | 14-Lead TSSOP | Package footprint and pin count affect PCB layout and whether a drop-in replacement is physically possible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range defines the environments in which the device can reliably operate. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ100 | AD5251BRUZ1 |
|---|---|---|
| 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 AD5251BRUZ1 digital potentiometers?
The AD5254BRUZ100 is a quad-channel, 100 kΩ, 256-position digital potentiometer with I²C interface and nonvolatile memory, while the AD5251BRUZ1 is a dual-channel, 1 kΩ, 64-position digital potentiometer with I²C interface and nonvolatile memory. The AD5254 offers four channels and higher resolution, whereas the AD5251 provides two channels with lower resistance and fewer positions.
Are the AD5254BRUZ100 and AD5251BRUZ1 pin-compatible?
No. The AD5254BRUZ100 is supplied in a 20-lead TSSOP package, while the AD5251BRUZ1 is supplied in a 14-lead TSSOP package. The different pin counts and pinouts prevent direct pin-to-pin compatibility.
Can the AD5251BRUZ1 be used as a drop-in replacement for the AD5254BRUZ100?
No. The AD5251BRUZ1 has only two channels and a 1 kΩ end-to-end resistance, whereas the AD5254BRUZ100 has four channels and a 100 kΩ end-to-end resistance. The differences in channel count, resistance, resolution, and package make direct substitution impossible without redesign.
What is the resolution of each device?
The AD5254BRUZ100 provides 256 positions (8-bit resolution) per channel. The AD5251BRUZ1 provides 64 positions (6-bit resolution) per channel.
Do both devices include nonvolatile memory for wiper settings?
Yes. Both the AD5254BRUZ100 and AD5251BRUZ1 feature nonvolatile memory (EEPROM) that retains the wiper position after power-down, allowing the devices to restore their last programmed setting on power-up.
What digital interface do the AD5254BRUZ100 and AD5251BRUZ1 use?
Both devices use a 2-wire I²C-compatible serial interface. The AD5254BRUZ100 supports standard and fast I²C modes, and the AD5251BRUZ1 also supports I²C communication for wiper adjustment and memory access.
What are the typical applications for each device?
The AD5254BRUZ100 is suited for applications requiring multiple channels and higher resolution, such as quad-channel gain control, offset trimming, and programmable filters. The AD5251BRUZ1 is used in dual-channel, lower-resistance applications such as dual-channel volume control, sensor calibration, and low-value resistance trimming.