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 AD5251BRUZ1 differ fundamentally in channel count, resistance value, and interface protocol, making them non-interchangeable in existing circuit designs. The AD5254BRUZ50 offers four independent channels with 50 kΩ end-to-end resistance and an I²C-compatible 2-wire interface, while the AD5251BRUZ1 provides dual channels with 1 kΩ resistance and a 3-wire up/down interface. These architectural differences prevent direct substitution without significant redesign of the control firmware, PCB layout, and associated passive components.
Different channel count
Different resistance value
Different interface protocol
Different package pinout
Parts at a glance
Part B
AD5251BRUZ1
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3167 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 | 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 Channels | 4 | 2 | Channel count defines how many independent resistance elements are available in a single package, affecting board space and circuit complexity. |
| End-to-End Resistance | 50 kΩ | 1 kΩ | Nominal resistance sets the impedance range of the potentiometer and must match the target circuit's design requirements. |
| 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 essential for applications requiring a remembered state at startup. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Operating voltage range must encompass the system supply to ensure proper operation and logic-level compatibility. |
| Package | 20-Lead TSSOP | 14-Lead TSSOP | Package footprint and pin count affect PCB layout and cannot be substituted without a board redesign. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +85 °C | The temperature range determines suitability for industrial or automotive environments versus commercial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ50 | 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) | 50k | 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 primary differences between the AD5254BRUZ50 and AD5251BRUZ1?
The AD5254BRUZ50 is a quad-channel, 256-position digital potentiometer with a 50 kΩ end-to-end resistance, while the AD5251BRUZ1 is a dual-channel, 64-position digital potentiometer with a 1 kΩ end-to-end resistance. They differ in channel count, resolution, and nominal resistance.
Are the AD5254BRUZ50 and AD5251BRUZ1 pin-compatible?
No. The AD5254BRUZ50 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 pin-to-pin compatibility.
Can the AD5254BRUZ50 and AD5251BRUZ1 operate from the same supply voltage?
Yes. Both devices are specified for a single-supply range of 2.7 V to 5.5 V, as well as dual-supply operation of ±2.5 V. However, the absolute maximum ratings and digital interface levels should be verified against the respective datasheets for the target application.
How do the digital interfaces of the AD5254BRUZ50 and AD5251BRUZ1 compare?
Both devices use a 2-wire I²C-compatible serial interface. The AD5254BRUZ50 supports standard and fast I²C modes up to 400 kHz, and the AD5251BRUZ1 also supports I²C-compatible operation. The AD5254 offers additional features such as selectable I²C addresses and a write-protect function.
What are the typical applications for the AD5254BRUZ50 versus the AD5251BRUZ1?
The AD5254BRUZ50, with four 50 kΩ channels and 256 positions, is suited for multi-channel gain and offset adjustment, programmable filters, and audio level control. The AD5251BRUZ1, with two 1 kΩ channels and 64 positions, is better suited for lower-resistance, lower-resolution tasks such as LCD bias adjustment or low-value trim applications.
Do the AD5254BRUZ50 and AD5251BRUZ1 have nonvolatile memory for wiper settings?
Yes. Both devices include nonvolatile EEPROM memory that retains the wiper position after power-down. The AD5254BRUZ50 stores wiper settings for its four channels, while the AD5251BRUZ1 stores settings for its two channels.
What is the end-to-end resistance tolerance for the AD5254BRUZ50 and AD5251BRUZ1?
The AD5254BRUZ50 has a nominal 50 kΩ end-to-end resistance with a specified tolerance of ±20%. The AD5251BRUZ1 has a nominal 1 kΩ end-to-end resistance with a specified tolerance of ±30%. These tolerances are typical for the respective product families and should be confirmed on the official datasheets.