Part A
AD5235BRUZ25
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5427 PCS
- Package
- TSSOP-16
- Series
- Data Acquisition - Digital Potentiometers
Replacement verdict
Compatible functional replacement candidate
The AD5235BRUZ25 and AD5231BRU50 are both single-channel digital potentiometers from Analog Devices in the same TSSOP-16 package, sharing a compatible SPI interface and similar architecture. However, they differ in end-to-end resistance (25 kΩ vs 50 kΩ) and resolution (1024-position vs 32-position), which directly affect wiper setting granularity and circuit calibration behavior. The AD5235BRUZ25 is not a direct drop-in replacement for the AD5231BRU50 without accounting for these differences in resistance value and tap count.
End-to-End Resistance
Validation required
Resolution
Not compatible
Package Type
High match
Interface Type
High match
Parts at a glance
Part B
AD5231BRU50
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 560 PCS
- Package
- TSSOP-16
- 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 | AD5235BRUZ25 | AD5231BRU50 | Why it matters |
|---|---|---|---|
| Number of Positions | 1024 | 1024 | Both provide 10-bit resolution, so wiper step granularity is equivalent. |
| End-to-End Resistance | 25 kΩ | 50 kΩ | Different nominal resistance changes the current and loading behavior in the target circuit. |
| Number of Potentiometers | 2 | 1 | The dual-channel device can replace two single-channel devices, affecting board space and channel count. |
| Interface Type | SPI | SPI | Both use a serial SPI-compatible interface, so the host communication protocol is compatible. |
| Nonvolatile Memory | Yes (EEPROM) | Yes (EEPROM) | Both retain wiper settings after power loss, which is important for boot-time configuration. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical supply requirements allow the same power rail to be used for either part. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings ensure both parts are suitable for the same industrial environments. |
| Package Type | 16-Lead TSSOP | 16-Lead TSSOP | Same package footprint simplifies PCB layout and potential drop-in substitution. |
| Wiper Resistance | 50 Ω typical | 50 Ω typical | Similar wiper resistance minimizes differences in voltage drop and signal error. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5235BRUZ25 | AD5231BRU50 |
|---|---|---|
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 1 |
| Number of Taps | 1024 | 1024 |
| Resistance(Ohms) | 25k | 50k |
| Interface | SPI | SPI |
| Memory Type | Non-Volatile | Non-Volatile |
| Voltage - Supply | 2.7V ~ 5V, ±2.25V ~ 2.75V | 2.7V ~ 5.5V, ±2.25V ~ 2.75V |
| Features | Cascade Pin | Cascade Pin |
| Tolerance | ±8% | -40%, +20% |
| Temperature Coefficient(Typ) | 35ppm/°C | 600ppm/°C |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD5235BRUZ25 and AD5231BRU50?
The AD5235BRUZ25 is a dual-channel, 1024-position digital potentiometer with a 25 kΩ end-to-end resistance, while the AD5231BRU50 is a single-channel, 1024-position digital potentiometer with a 50 kΩ end-to-end resistance. Both offer nonvolatile memory and SPI-compatible interfaces, but the AD5235 provides two independent channels, whereas the AD5231 provides one channel.
Are the AD5235BRUZ25 and AD5231BRU50 pin-compatible?
No. The AD5235BRUZ25 is housed in a 16-lead TSSOP (RU-16 package), and the AD5231BRU50 is housed in a 16-lead TSSOP as well, but their pin functions differ because the AD5235 integrates two independent potentiometer channels while the AD5231 integrates only one. Pin assignments and external connections are not interchangeable without design changes.
What is the resolution of each device?
Both the AD5235BRUZ25 and AD5231BRU50 provide 1024-position resolution (10 bits) for each internal RDAC. The AD5235 has two such RDACs, while the AD5231 has one.
Do both devices include nonvolatile memory for wiper position storage?
Yes. Both the AD5235BRUZ25 and AD5231BRU50 include nonvolatile EEMEM that can store the wiper setting, allowing the wiper position to be restored after power cycling without external intervention.
What digital interface do the AD5235BRUZ25 and AD5231BRU50 use?
Both devices use a 3-wire SPI-compatible serial interface for programming the wiper position and accessing the nonvolatile memory. The interface supports daisy-chain operation on the AD5235 for multiple devices.
Can the AD5231BRU50 be used as a drop-in replacement for one channel of the AD5235BRUZ25?
No. Although both have 1024-position resolution and similar digital interfaces, the AD5231BRU50 has a 50 kΩ end-to-end resistance versus 25 kΩ for the AD5235BRUZ25, and the AD5231 is a single-channel device in a different pin configuration. A drop-in replacement is not possible without verifying resistance, pinout, and channel count requirements.
What are the typical operating voltage ranges for these digital potentiometers?
Both the AD5235BRUZ25 and AD5231BRU50 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. The digital interface logic levels are compatible with 3 V and 5 V systems.
Which device is better for applications requiring two independent programmable resistance channels?
The AD5235BRUZ25 is the appropriate choice because it integrates two independent 1024-position RDACs in one package. The AD5231BRU50 provides only one channel, so two AD5231 devices would be required to achieve the same functionality, increasing board space and component count.