Part A
AD5254BRUZ10
ADI公司
- Lifecycle
- Active
- Stock
- 5455 件
- Package
- TSSOP-20
- Series
- 資料獲取-數位電位器
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ10 and AD5251BRUZ1 are not functionally interchangeable. They differ in channel count, end-to-end resistance, interface protocol, and nonvolatile memory architecture, so substituting one for the other requires a full circuit and firmware redesign rather than a direct drop-in swap.
Different channel count
Different end-to-end resistance
Different interface protocol
Different memory architecture
Parts at a glance
Part B
AD5251BRUZ1
ADI公司
- Lifecycle
- Active
- Stock
- 3167 件
- Package
- TSSOP-14
- Series
- 資料獲取-數位電位器
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 | AD5251BRUZ1 | Why it matters |
|---|---|---|---|
| Number of Positions | 256 | 64 | Determines the resolution of resistance adjustment; a 256-position device offers finer wiper granularity than a 64-position device. |
| Number of Channels | 4 | 2 | Indicates how many independent potentiometer channels are integrated in one package, affecting board space and channel count requirements. |
| End-to-End Resistance | 10 kΩ | 1 kΩ | Sets the nominal resistance range of the potentiometer, which must match the circuit's impedance and current requirements. |
| 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. |
| 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 | Both devices operate over the same supply range, allowing similar power supply design and compatibility with common logic levels. |
| Package Type | 20-Lead TSSOP | 14-Lead TSSOP | Package footprint and pin count affect PCB layout, thermal performance, and mechanical compatibility. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Both devices support the same industrial temperature range, making them suitable for similar environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ10 | 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) | 10k | 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 AD5254BRUZ10 and AD5251BRUZ1?
The AD5254BRUZ10 is a quad-channel, 10 kΩ digital potentiometer with 256 positions and an I²C interface, while the AD5251BRUZ1 is a dual-channel, 1 kΩ digital potentiometer with 64 positions and an up/down interface. They differ in channel count, end-to-end resistance, resolution, and control interface.
Are the AD5254BRUZ10 and AD5251BRUZ1 pin-compatible?
No. The AD5254BRUZ10 is supplied in a 20-lead TSSOP (RU-20) package, whereas the AD5251BRUZ1 is supplied in a 14-lead TSSOP (RU-14) package. The different pin counts and pinouts prevent direct PCB drop-in replacement.
Can the AD5254BRUZ10 and AD5251BRUZ1 be used in the same circuit design without modification?
No. Beyond package and pinout differences, the AD5254BRUZ10 uses an I²C serial interface and provides 256 wiper positions per channel, while the AD5251BRUZ1 uses a 3-wire up/down interface with 64 positions per channel. Firmware, control logic, and PCB layout would all require redesign.
What are the end-to-end resistance values of the AD5254BRUZ10 and AD5251BRUZ1?
The AD5254BRUZ10 has a 10 kΩ nominal end-to-end resistance. The AD5251BRUZ1 has a 1 kΩ nominal end-to-end resistance. These values are specified in the respective manufacturer datasheets.
How many channels and wiper positions does each device provide?
The AD5254BRUZ10 provides four independent potentiometer channels with 256 wiper positions each. The AD5251BRUZ1 provides two independent potentiometer channels with 64 wiper positions each.
What control interfaces do the AD5254BRUZ10 and AD5251BRUZ1 use?
The AD5254BRUZ10 uses a 2-wire I²C-compatible serial interface. The AD5251BRUZ1 uses a 3-wire up/down (increment/decrement) interface with chip select and direction control.
Do the AD5254BRUZ10 and AD5251BRUZ1 have nonvolatile memory for wiper settings?
Yes. Both the AD5254BRUZ10 and AD5251BRUZ1 include nonvolatile EEPROM memory that retains the wiper setting after power is removed, allowing the devices to power up in a known state.
What are the typical operating voltage ranges for the AD5254BRUZ10 and AD5251BRUZ1?
Both devices operate from a single 2.7 V to 5.5 V supply, or from dual ±2.5 V supplies, as specified in the Analog Devices datasheets for the AD5254 and AD5251 families.