Part A
AD5254BRUZ50
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2128 PCS
- Package
- TSSOP-20
- Series
- Acquisition de données - potentiomètres numériques
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ50 and AD5251BRU10 are not drop-in replacements for each other. The AD5254BRUZ50 is a quad-channel 50 kΩ digital potentiometer with I²C interface and nonvolatile memory, while the AD5251BRU10 is a dual-channel 10 kΩ digital potentiometer with a different interface and memory architecture. They differ in channel count, end-to-end resistance, interface type, and package pinout, requiring circuit redesign and firmware changes before substitution can be considered.
Different channel count
Different end-to-end resistance
Different interface type
Different package pinout
Parts at a glance
Part B
AD5251BRU10
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4849 PCS
- Package
- TSSOP-14
- Series
- Acquisition de données - potentiomètres numériques
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 | AD5251BRU10 | 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 | Affects how many independent resistance settings can be controlled in a single package, impacting board space and circuit complexity. |
| End-to-End Resistance | 50 kΩ | 10 kΩ | Sets the nominal resistance range of the potentiometer, which must match the impedance requirements of the surrounding circuit. |
| Interface Type | I²C | Up/Down (3-wire) | Determines the digital communication protocol required by the host controller, affecting firmware and pin count. |
| Nonvolatile Memory | Yes (EEPROM) | No | Nonvolatile storage retains the wiper setting across power cycles, eliminating the need for reinitialization after each power-up. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the operating voltage window; both parts share the same range, allowing similar power supply design. |
| Package | 14-Lead TSSOP | 14-Lead TSSOP | Physical footprint and pinout must match the PCB layout for direct substitutability. |
| Wiper Resistance | ~50 Ω (typical) | ~50 Ω (typical) | Adds a small series resistance in the signal path; similar values ensure comparable signal integrity. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Indicates the environmental conditions under which the device is guaranteed to operate reliably. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ50 | AD5251BRU10 |
|---|---|---|
| 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 AD5251BRU10?
The AD5254BRUZ50 is a quad-channel, 256-position digital potentiometer with a 50 kΩ end-to-end resistance, while the AD5251BRU10 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 AD5251BRU10 pin-compatible?
No. The AD5254BRUZ50 is supplied in a 20-lead TSSOP package, and the AD5251BRU10 is supplied in a 14-lead TSSOP package. They have different pin counts and pinouts, so they are not pin-compatible.
What is the resolution of each device?
The AD5254BRUZ50 has 256 positions (8-bit resolution) per channel. The AD5251BRU10 has 64 positions (6-bit resolution) per channel.
What are the end-to-end resistance values and tolerances?
The AD5254BRUZ50 has a nominal 50 kΩ end-to-end resistance. The AD5251BRU10 has a nominal 10 kΩ end-to-end resistance. Both devices are specified with a ±30% maximum resistance tolerance over the operating temperature range, as stated in their respective datasheets.
How many channels does each digital potentiometer provide?
The AD5254BRUZ50 provides four independent digitally controlled potentiometers (quad channel). The AD5251BRU10 provides two independent digitally controlled potentiometers (dual channel).
What digital interface do these devices use?
Both the AD5254BRUZ50 and AD5251BRU10 use a 2-wire I²C-compatible serial interface for programming the wiper positions and for reading back the stored values.
Do these devices have nonvolatile memory for wiper settings?
Yes. Both the AD5254BRUZ50 and AD5251BRU10 include nonvolatile EEPROM memory that retains the wiper settings after power is removed, allowing the devices to power up in the previously stored wiper position.
What are the typical operating voltage ranges for these digital potentiometers?
The AD5254BRUZ50 operates from a single supply of 2.7 V to 5.5 V, or from dual supplies of ±2.5 V. The AD5251BRU10 operates from a single supply of 2.7 V to 5.5 V, or from dual supplies of ±2.5 V. Both are specified for operation over the extended industrial temperature range of −40°C to +105°C.