Part A
AD5254BRUZ50
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2128 個数
- Package
- TSSOP-20
- Series
- データ取得 - デジタルポテンショメータ
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ50 and AD5251BRUZ10 are not functionally interchangeable. They differ in channel count, nominal resistance, interface protocol, and nonvolatile memory architecture, so direct substitution is not possible without circuit redesign and firmware modification.
Different channel count
Different end-to-end resistance
Different digital interface
Different memory architecture
Parts at a glance
Part B
AD5251BRUZ10
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 389 個数
- Package
- TSSOP-14
- Series
- データ取得 - デジタルポテンショメータ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5254BRUZ50 | AD5251BRUZ10 | 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; affects board space and channel count in multi-channel designs. |
| End-to-End Resistance | 50 kΩ | 10 kΩ | Sets the nominal resistance range and directly impacts the current and voltage levels in the target circuit. |
| Interface Type | I²C | Up/Down (3-wire) | Determines the digital control protocol; I²C allows addressable bus control 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 | Defines the compatible power rails; matching ranges allow both parts to operate in the same system supply environment. |
| Package | 20-Lead TSSOP | 14-Lead TSSOP | Footprint and pin count affect PCB layout and may prevent drop-in replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures both devices meet the same environmental requirements for industrial and commercial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ50 | 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) | 50k | 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 AD5254BRUZ50 and AD5251BRUZ10?
The AD5254BRUZ50 is a quad-channel, 256-position digital potentiometer with a 50 kΩ end-to-end resistance, while the AD5251BRUZ10 is a dual-channel, 64-position digital potentiometer with a 10 kΩ end-to-end resistance. The AD5254 offers more channels and higher resolution, whereas the AD5251 provides a lower resistance value and smaller channel count.
Are the AD5254BRUZ50 and AD5251BRUZ10 pin-compatible?
No. The AD5254BRUZ50 is supplied in a 20-lead TSSOP (RU-20) package, while the AD5251BRUZ10 is supplied in a 14-lead TSSOP (RU-14) package. The different pin counts and pinouts prevent direct pin-to-pin compatibility.
Can the AD5251BRUZ10 be used as a drop-in replacement for the AD5254BRUZ50?
No. Beyond package and pinout differences, the AD5254BRUZ50 has four independent potentiometers with 256 positions each, while the AD5251BRUZ10 has only two potentiometers with 64 positions each. A replacement would require significant redesign of the circuit and firmware.
What are the end-to-end resistance tolerances of these two digital potentiometers?
Both devices are specified with a nominal resistance tolerance of ±20% per the manufacturer datasheets. The AD5254BRUZ50 has a 50 kΩ nominal resistance, and the AD5251BRUZ10 has a 10 kΩ nominal resistance.
Do both devices support I²C interface communication?
Yes. Both the AD5254BRUZ50 and AD5251BRUZ10 feature a 2-wire I²C-compatible serial interface. However, the AD5254 supports both standard and fast I²C modes, while the AD5251 supports standard I²C mode only, as specified in their respective datasheets.
What are the operating voltage ranges for the AD5254BRUZ50 and AD5251BRUZ10?
The AD5254BRUZ50 operates from a single supply of 2.7 V to 5.5 V, or dual supplies of ±2.5 V to ±2.7 V. The AD5251BRUZ10 operates from a single supply of 2.7 V to 5.5 V, or dual supplies of ±2.5 V. Both are specified for the extended industrial temperature range of −40°C to +85°C.
How many wiper positions are available on each device?
The AD5254BRUZ50 provides 256 wiper positions per channel (8-bit resolution), while the AD5251BRUZ10 provides 64 wiper positions per channel (6-bit resolution). This difference affects the achievable adjustment granularity in the target application.
Are nonvolatile memory features available on both parts?
Yes. Both the AD5254BRUZ50 and AD5251BRUZ10 include nonvolatile EEPROM memory that stores the wiper settings, allowing the devices to retain their last programmed position after power cycling. The AD5254 stores settings for four channels, while the AD5251 stores settings for two channels.