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 AD5231BRU100 are both single-channel digital potentiometers from Analog Devices, but they differ in end-to-end resistance, interface protocol, and resolution. The AD5235BRUZ25 offers a 25 kΩ resistance with 1024-position resolution and SPI interface, while the AD5231BRU100 provides a 100 kΩ resistance with 1024-position resolution and I²C interface. Due to the significant difference in resistance value and interface type, they are not direct drop-in replacements, but may serve as functional substitutes in applications where resistance tolerance and communication protocol can be adapted.
End-to-End Resistance
Validation required
Interface Type
Not compatible
Resolution
High match
Package Type
High match
Parts at a glance
Part B
AD5231BRU100
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7575 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 | AD5231BRU100 | 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 | 100 kΩ | Different nominal resistance changes the current loading and the usable signal range in a given circuit. |
| Number of Channels | 2 | 1 | Channel count determines how many independent resistance settings can be controlled in one package. |
| Interface Type | SPI | SPI | Both use a serial SPI-compatible interface, simplifying digital control and daisy-chaining. |
| Nonvolatile Memory | Yes (EEPROM) | Yes (EEPROM) | Nonvolatile storage retains the wiper setting after power-down, avoiding recalibration on startup. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply ranges allows both parts to operate from the same system rail. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure comparable environmental robustness. |
| Package / Mounting | 16-Lead TSSOP | 16-Lead TSSOP | Same package and footprint enable direct board-level interchangeability. |
| Wiper Resistance | 50 Ω typical | 50 Ω typical | Similar wiper resistance minimizes insertion error and loading effects in signal paths. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5235BRUZ25 | AD5231BRU100 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 1 |
| Number of Taps | 1024 | 1024 |
| 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 AD5231BRU100?
The AD5235BRUZ25 is a dual-channel, 25 kΩ nonvolatile digital potentiometer with 1024 positions, while the AD5231BRU100 is a single-channel, 100 kΩ nonvolatile digital potentiometer with 1024 positions. The AD5235 provides two independent potentiometers in a 16-lead TSSOP package, whereas the AD5231 provides one potentiometer in a 16-lead TSSOP package.
Are the AD5235BRUZ25 and AD5231BRU100 pin-compatible?
No. Although both devices are offered in 16-lead TSSOP packages, their pin functions differ because the AD5235 is a dual-channel device and the AD5231 is a single-channel device. The AD5235 uses additional pins for the second channel, so the pinouts are not interchangeable.
What is the end-to-end resistance of each device?
The AD5235BRUZ25 has a nominal end-to-end resistance of 25 kΩ. The AD5231BRU100 has a nominal end-to-end resistance of 100 kΩ. Both are nonvolatile digital potentiometers with 1024-position resolution.
How many potentiometer channels does each device provide?
The AD5235BRUZ25 provides two independent digitally controlled potentiometer channels. The AD5231BRU100 provides one digitally controlled potentiometer channel.
What is the resolution of the AD5235BRUZ25 and AD5231BRU100?
Both the AD5235BRUZ25 and AD5231BRU100 offer 10-bit resolution, corresponding to 1024 positions per potentiometer channel.
Do both devices retain their settings after power-off?
Yes. Both the AD5235BRUZ25 and AD5231BRU100 are nonvolatile digital potentiometers, meaning they retain their wiper settings after power is removed without requiring an external backup supply.
What communication interface do the AD5235BRUZ25 and AD5231BRU100 use?
Both devices use a 4-wire SPI-compatible serial interface for programming the wiper position and reading back data.
Can the AD5231BRU100 be used as a direct substitute for the AD5235BRUZ25 in an existing design?
No. The AD5231BRU100 is a single-channel 100 kΩ device, while the AD5235BRUZ25 is a dual-channel 25 kΩ device. Differences in channel count, end-to-end resistance, and pinout prevent a direct substitution without redesign and validation against the manufacturer datasheets.