Part A
AD5175BRMZ-10
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5022 PCS
- Package
- MSOP-10
- Series
- Acquisição de dados - Potenciômetros Digitais
Replacement verdict
Not a drop-in replacement
The AD5175BRMZ-10 and AD5170BRM2.5 are not drop-in replacements for each other. Although both are single-channel digital potentiometers from Analog Devices, they differ fundamentally in nonvolatile memory architecture, nominal resistance, interface protocol, and package footprint. The AD5175BRMZ-10 offers 1 kΩ end-to-end resistance with I²C control and 1024-position resolution, while the AD5170BRM2.5 provides 2.5 kΩ end-to-end resistance with a 256-position up/down interface. These differences in resistance value, resolution, and control interface prevent direct substitution without circuit redesign and firmware modification.
Different end-to-end resistance
Different interface protocol
Different resolution
Different package footprint
Parts at a glance
Part B
AD5170BRM2.5
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5078 PCS
- Package
- MSOP-10
- Series
- Acquisição de dados - Potenciômetros Digitais
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5175BRMZ-10 | AD5170BRM2.5 | Why it matters |
|---|---|---|---|
| Number of Positions | 1024 | 256 | Determines the resolution of the digital potentiometer; a higher number of positions allows finer adjustment of the resistance setting. |
| Nominal Resistance | 10 kΩ | 2.5 kΩ | Sets the end-to-end resistance range, which must match the circuit's required impedance for proper signal or bias levels. |
| Interface Type | I²C | I²C | Defines the digital communication protocol used to program the device; both use I²C, so host controller compatibility is maintained. |
| Memory Type | One-Time Programmable (OTP) | One-Time Programmable (OTP) | Indicates whether the wiper setting can be permanently stored; OTP allows a fixed configuration after programming. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Specifies the allowable power supply range; matching ranges ensures the parts can operate in the same system voltage domain. |
| Package / Case | 10-TFSOP, 10-MSOP | 10-TFSOP, 10-MSOP | Determines the physical footprint and PCB layout compatibility; identical packages allow direct board replacement. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Defines the environmental conditions under which the device is guaranteed to function; matching ranges ensures suitability for the same application environment. |
| Wiper Resistance | 50 Ω (typical) | 50 Ω (typical) | Represents the on-resistance of the internal switches; lower values reduce signal attenuation and error in the resistance setting. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5175BRMZ-10 | AD5170BRM2.5 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Rheostat | Potentiometer |
| Number of Circuits | 1 | 1 |
| Number of Taps | 1024 | 256 |
| Resistance(Ohms) | 10k | 2.5k |
| Interface | I²C | I²C |
| Memory Type | Non-Volatile | OTP |
| Voltage - Supply | 2.7V ~ 5.5V, ±2.5V ~ 2.75V | 2.7V ~ 5.5V |
| Features | Selectable Address | Selectable Address |
| Tolerance | ±15% | ±20% |
| Temperature Coefficient(Typ) | 35ppm/°C | 35ppm/°C |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD5175BRMZ-10 and the AD5170BRM2.5?
The AD5175BRMZ-10 is a single-channel, 1024-position digital potentiometer with an end-to-end resistance of 10 kΩ and a nominal temperature coefficient of 35 ppm/°C. The AD5170BRM2.5 is a single-channel, 256-position digital potentiometer with an end-to-end resistance of 2.5 kΩ and a nominal temperature coefficient of 35 ppm/°C. The AD5175 offers 10-bit resolution (1024 positions), while the AD5170 offers 8-bit resolution (256 positions). Both are nonvolatile, I²C-compatible digital potentiometers in 10-lead MSOP packages.
Are the AD5175BRMZ-10 and AD5170BRM2.5 pin-compatible?
No. Although both devices are offered in 10-lead MSOP packages, their pin functions and pinouts differ. The AD5175BRMZ-10 and AD5170BRM2.5 are not pin-to-pin replacements. Designers must consult the respective manufacturer datasheets to verify pin assignments before considering a layout change.
Can the AD5175BRMZ-10 and AD5170BRM2.5 be used in the same circuit without modification?
No. The two devices differ in end-to-end resistance (10 kΩ vs. 2.5 kΩ), resolution (1024 positions vs. 256 positions), and pinout. These differences affect wiper resistance, voltage divider ratios, and digital interface timing. A direct drop-in substitution is not possible without redesigning the circuit and validating performance against the target application requirements.
What is the resolution of each device?
The AD5175BRMZ-10 provides 1024 positions (10-bit resolution), allowing wiper settings from 0 to 1023. The AD5170BRM2.5 provides 256 positions (8-bit resolution), allowing wiper settings from 0 to 255. Higher resolution in the AD5175 enables finer adjustment of the output voltage or resistance.
What is the end-to-end resistance of each device?
The AD5175BRMZ-10 has a nominal end-to-end resistance of 10 kΩ. The AD5170BRM2.5 has a nominal end-to-end resistance of 2.5 kΩ. The resistance value directly affects the current handling, power dissipation, and the achievable adjustment range in a given circuit.
Do both devices support nonvolatile memory storage of the wiper setting?
Yes. Both the AD5175BRMZ-10 and the AD5170BRM2.5 are nonvolatile digital potentiometers. They retain the last programmed wiper position after power is removed, eliminating the need for a backup supply or reinitialization on power-up.
What digital interface do the AD5175BRMZ-10 and AD5170BRM2.5 use?
Both devices use an I²C-compatible serial interface for programming the wiper position and reading back the stored value. The interface operates at standard and fast I²C speeds, allowing communication with most microcontrollers and digital signal processors.
What is the operating temperature range for both devices?
Both the AD5175BRMZ-10 and the AD5170BRM2.5 are specified for the industrial temperature range of −40°C to +125°C. This makes them suitable for industrial, automotive, and other harsh-environment applications where wide temperature operation is required.
Which device is better for applications requiring fine adjustment?
The AD5175BRMZ-10 is better suited for applications requiring fine adjustment because it offers 1024 wiper positions (10-bit resolution) compared to 256 positions (8-bit resolution) in the AD5170BRM2.5. The higher resolution allows more precise setting of the output voltage or resistance, which is critical in calibration and tuning circuits.