Part A
AD5254BRUZ50
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2128 Stückzahl
- Package
- TSSOP-20
- Series
- Datenerfassung
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ50 and AD5251BRUZ100 are not drop-in replacements for each other. They differ in channel count, nominal resistance, interface protocol, and volatile/nonvolatile memory architecture, so a direct substitution is not feasible without circuit and firmware redesign.
Different channel count
Different end-to-end resistance
Different digital interface
Different memory architecture
Parts at a glance
Part B
AD5251BRUZ100
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8797 Stückzahl
- Package
- TSSOP-14
- Series
- Datenerfassung
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 | AD5251BRUZ100 | 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. |
| End-to-End Resistance | 50 kΩ | 100 kΩ | The nominal resistance directly affects the voltage-divider ratio and current in the target circuit, so a different value changes circuit behavior. |
| Number of Potentiometers | 4 | 2 | The count of independent resistor channels determines how many separate adjustments can be made in one package. |
| Interface Type | I²C | Up/Down (3-wire) | The digital control interface must match the host controller; I²C and up/down interfaces are not directly interchangeable. |
| Nonvolatile Memory | Yes (EEPROM) | No | Nonvolatile storage retains the wiper setting through 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 | Both devices operate over the same supply range, so power-supply compatibility is maintained. |
| Wiper Resistance | ~200 Ω | ~200 Ω | Wiper resistance contributes to the total resistance seen by the load and affects accuracy at the ends of the adjustment range. |
| Package | 20-Lead TSSOP | 14-Lead TSSOP | Package footprint and pin count must match the PCB layout for a drop-in replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both parts support the same industrial temperature range, ensuring environmental compatibility. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ50 | AD5251BRUZ100 |
|---|---|---|
| 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 | 100k |
| 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 AD5251BRUZ100?
The AD5254BRUZ50 is a quad-channel, 50 kΩ digital potentiometer with 256 positions and an I²C interface, while the AD5251BRUZ100 is a dual-channel, 100 kΩ digital potentiometer with 64 positions and an I²C interface. The AD5254 offers four independent channels and higher resolution, whereas the AD5251 provides two channels with a higher end-to-end resistance.
Are the AD5254BRUZ50 and AD5251BRUZ100 pin-compatible?
No. The AD5254BRUZ50 is supplied in a 20-lead TSSOP (RU-20) package, and the AD5251BRUZ100 is supplied in a 14-lead TSSOP (RU-14) package. The different pin counts and pinouts prevent direct pin-to-pin replacement without PCB redesign.
Can the AD5254BRUZ50 and AD5251BRUZ100 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, as specified in the Analog Devices datasheets. This makes them compatible with common 3.3 V and 5 V logic systems.
How do the resolutions of the AD5254BRUZ50 and AD5251BRUZ100 compare?
The AD5254BRUZ50 provides 256 wiper positions (8-bit resolution) per channel, while the AD5251BRUZ100 provides 64 wiper positions (6-bit resolution) per channel. The AD5254 therefore offers finer adjustment granularity.
What is the end-to-end resistance tolerance of each device?
The AD5254BRUZ50 has a nominal 50 kΩ end-to-end resistance, and the AD5251BRUZ100 has a nominal 100 kΩ end-to-end resistance. Both are specified with a ±30% tolerance over the operating temperature range, per the Analog Devices datasheets.
Do both devices support nonvolatile wiper memory?
Yes. Both the AD5254BRUZ50 and AD5251BRUZ100 include nonvolatile EEPROM memory that retains the wiper setting after power-down, allowing the devices to power up in a known state without external intervention.
What digital interface do the AD5254BRUZ50 and AD5251BRUZ100 use?
Both devices use a 2-wire I²C-compatible serial interface. The AD5254BRUZ50 supports standard and fast I²C modes up to 400 kHz, and the AD5251BRUZ100 supports the same I²C protocol, allowing multiple devices to share the same bus.
Which device is better suited for applications requiring more independent channels?
The AD5254BRUZ50 is better suited for multi-channel applications because it integrates four independent digitally controlled potentiometers in a single package, whereas the AD5251BRUZ100 provides only two channels. This reduces component count and board space in systems needing more than two adjustable resistance elements.