Part A
AD5235BRUZ25
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5427 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - potentiomètres numériques
Replacement verdict
Compatible functional replacement candidate
The AD5235BRUZ25 and AD5232BRU100 are both dual-channel digital potentiometers from Analog Devices, but they differ in resolution, nominal resistance, and interface speed. The AD5235BRUZ25 offers higher resolution and a faster SPI interface, while the AD5232BRU100 provides a higher nominal resistance value. They are not pin-compatible drop-in replacements, but they can serve as functional substitutes in applications where the differing resistance and resolution parameters are acceptable.
Resolution
Validation required
Nominal Resistance
Not compatible
Interface Type
High match
Package Type
Validation required
Parts at a glance
Part B
AD5232BRU100
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8104 PCS
- Package
- TSSOP-16
- 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 | AD5235BRUZ25 | AD5232BRU100 | Why it matters |
|---|---|---|---|
| Number of Positions | 1024 | 256 | Resolution determines the number of adjustable steps; a 1024-position device offers finer wiper resolution than a 256-position device. |
| End-to-End Resistance | 25 kΩ | 100 kΩ | The nominal resistance directly affects the current and voltage range the potentiometer can handle in a given circuit. |
| Number of Channels | 2 | 2 | Channel count determines how many independent resistance paths are available in a single package. |
| Interface Type | SPI | I2C | The digital interface must match the host controller; SPI and I2C are not directly interchangeable without protocol conversion. |
| Nonvolatile Memory | Yes (EEPROM) | No | Nonvolatile memory retains the wiper setting across power cycles, which is critical for applications requiring a known startup state. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | The supply range must be compatible with the system power rail for proper operation. |
| Wiper Resistance | 50 Ω (typical) | 60 Ω (typical) | Lower wiper resistance reduces signal attenuation and improves accuracy in voltage divider configurations. |
| Package Type | 16-Lead TSSOP | 16-Lead TSSOP | Package compatibility affects PCB layout and assembly; identical packages simplify substitution. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range must cover the application environment for reliable operation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5235BRUZ25 | AD5232BRU100 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 2 |
| Number of Taps | 1024 | 256 |
| Resistance(Ohms) | 25k | 100k |
| 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 AD5232BRU100?
The AD5235BRUZ25 is a dual-channel, 1024-position digital potentiometer with a 25 kΩ end-to-end resistance, while the AD5232BRU100 is a dual-channel, 256-position digital potentiometer with a 100 kΩ end-to-end resistance. The AD5235 offers higher resolution (10-bit vs. 8-bit) and a lower resistance value, whereas the AD5232 provides a higher resistance option with fewer tap positions.
Are the AD5235BRUZ25 and AD5232BRU100 pin-compatible?
Both devices are offered in a 16-lead TSSOP package (RU-16 suffix), and their pinouts are identical for the dual-channel potentiometer configuration. However, designers must verify the specific pin functions and external connections against the respective datasheets, as internal register maps and control interface details may differ.
What is the resolution of each digital potentiometer?
The AD5235BRUZ25 provides 1024 positions (10-bit resolution) per channel, while the AD5232BRU100 provides 256 positions (8-bit resolution) per channel. This means the AD5235 allows finer adjustment steps than the AD5232.
What are the end-to-end resistance values and tolerances?
The AD5235BRUZ25 has a nominal end-to-end resistance of 25 kΩ, and the AD5232BRU100 has a nominal end-to-end resistance of 100 kΩ. Both devices typically specify a resistance tolerance of ±30% over the full temperature range, as stated in their respective manufacturer datasheets.
What supply voltage ranges do these devices support?
Both the AD5235BRUZ25 and AD5232BRU100 operate from a single supply of 2.7 V to 5.5 V, or from dual supplies of ±2.5 V to ±2.7 V. This makes them suitable for low-voltage and mixed-supply applications.
What digital interface is used to control these potentiometers?
Both devices use a 3-wire SPI-compatible serial interface for programming the wiper position and reading back data. The AD5235 also includes a nonvolatile memory (EEPROM) to store wiper settings, while the AD5232 does not have nonvolatile memory.
Can the AD5235BRUZ25 and AD5232BRU100 be used in rheostat mode?
Yes, both devices can be configured in rheostat mode (using the A terminal and W terminal) or potentiometer mode (using all three terminals A, W, and B). The choice of mode affects the effective resistance and temperature coefficient, as detailed in the datasheets.
What are the typical applications for each device?
The AD5235BRUZ25 is often used in applications requiring fine resolution and nonvolatile memory, such as calibration and adjustable gain/offset circuits. The AD5232BRU100 is suited for lower-resolution, higher-resistance applications like volume control, brightness adjustment, and general-purpose trimming where 8-bit resolution is sufficient.