Part A
AD5254BRUZ100
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4724 PCS
- Package
- TSSOP-20
- Series
- Data Acquisition - Digital Potentiometers
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ100 and AD5251BRU10 are not drop-in replacements for each other. The AD5254BRUZ100 is a quad-channel, 100 kΩ, I²C-compatible digital potentiometer in a 20-lead TSSOP, while the AD5251BRU10 is a dual-channel, 10 kΩ, up/down interface digital potentiometer in a 14-lead TSSOP. They differ in channel count, end-to-end resistance, control interface, and package footprint, so a direct substitution is not possible without circuit and layout redesign.
Different channel count
Different end-to-end resistance
Different control interface
Different package footprint
Parts at a glance
Part B
AD5251BRU10
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4849 PCS
- Package
- TSSOP-14
- Series
- Data Acquisition - Digital Potentiometers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5254BRUZ100 | AD5251BRU10 | Why it matters |
|---|---|---|---|
| Number of Positions | 256 | 1024 | Higher resolution allows finer adjustment of resistance, which is critical for precise calibration and control applications. |
| Number of Potentiometers | 4 | 2 | The number of independent channels determines how many separate resistance settings can be controlled in a single package. |
| End-to-End Resistance | 100 kΩ | 10 kΩ | The total resistance value must match the circuit's impedance requirements for proper signal level and power consumption. |
| Interface Type | I²C | SPI | The digital communication protocol must be compatible with the host controller's available bus interface. |
| Package / Case | 20-TSSOP | 14-TSSOP | Physical footprint and pin count affect PCB layout and may require board redesign for substitution. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Operating voltage compatibility ensures the device functions correctly within the system's power rails. |
| Nonvolatile Memory | Yes (EEPROM) | Yes (EEPROM) | Nonvolatile storage retains the wiper setting after power loss, eliminating the need for recalibration on startup. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Temperature range must cover the application's environmental conditions for reliable operation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ100 | 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) | 100k | 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 AD5254BRUZ100 and AD5251BRU10?
The AD5254BRUZ100 is a quad-channel, 100 kΩ, 256-position I2C digital potentiometer in a 20-lead TSSOP package, while the AD5251BRU10 is a dual-channel, 10 kΩ, 64-position I2C digital potentiometer in a 14-lead TSSOP package. They differ in channel count, end-to-end resistance, resolution, and package size.
Are the AD5254BRUZ100 and AD5251BRU10 pin-to-pin compatible?
No. The AD5254BRUZ100 uses a 20-lead TSSOP package, whereas the AD5251BRU10 uses a 14-lead TSSOP package. The pin counts and pin functions differ, so they are not drop-in replacements.
Can the AD5251BRU10 be used as a substitute for the AD5254BRUZ100 in an existing design?
Not directly. The AD5254BRUZ100 provides four independent 100 kΩ channels with 256 positions, while the AD5251BRU10 provides only two 10 kΩ channels with 64 positions. Channel count, resistance value, resolution, and package footprint all differ, so substitution requires a full design review.
What is the end-to-end resistance tolerance of each device?
Both the AD5254BRUZ100 and AD5251BRU10 are specified with a nominal end-to-end resistance tolerance of ±20% over the operating temperature range, as stated in their respective Analog Devices datasheets.
What supply voltage range do the AD5254BRUZ100 and AD5251BRU10 support?
Both devices operate from a single 2.7 V to 5.5 V supply, or from dual ±2.5 V supplies, per the Analog Devices datasheets. This makes them suitable for 3 V and 5 V logic systems.
How many wiper positions does each device offer?
The AD5254BRUZ100 offers 256 wiper positions per channel (8-bit resolution), while the AD5251BRU10 offers 64 wiper positions per channel (6-bit resolution).
Do both devices use the same digital interface?
Yes. Both the AD5254BRUZ100 and AD5251BRU10 use a 2-wire I2C-compatible serial interface. However, the AD5254 supports up to four hardware address pins for multiple devices on the same bus, while the AD5251 provides fewer address options due to its smaller pin count.
What are the typical applications for each device?
The AD5254BRUZ100 is typically used where multiple 100 kΩ digitally controlled resistance channels are needed, such as in quad-channel gain and offset adjustment, programmable filters, and sensor calibration. The AD5251BRU10 is suited for dual-channel 10 kΩ applications such as volume control, LCD panel adjustment, and low-channel-count trim circuits.