Part A
AD8403ARUZ1
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2995 PCS
- Package
- TSSOP-24
- Series
- Acquisition de données - potentiomètres numériques
Replacement verdict
Not a drop-in replacement
The AD8403ARUZ1 and AD8402ARU100 are not drop-in replacements for each other. Although both are quad/dual-channel digital potentiometers from the same AD840x family in TSSOP packages, they differ in channel count, end-to-end resistance, and interface configuration, so a direct board-level substitution is not possible without design changes.
Different channel count
Different end-to-end resistance
Different interface configuration
Different package pinout
Parts at a glance
Part B
AD8402ARU100
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8657 PCS
- Package
- TSSOP-14
- 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 | AD8403ARUZ1 | AD8402ARU100 | Why it matters |
|---|---|---|---|
| Number of Potentiometers | 4 | 2 | Determines how many independent digitally controlled resistance channels are available in the system. |
| End-to-End Resistance | 1 kΩ | 100 kΩ | Sets the nominal resistance range, directly affecting the current and voltage scaling in the application circuit. |
| Resolution | 8-bit (256 positions) | 8-bit (256 positions) | Defines the number of discrete wiper steps and thus the achievable adjustment granularity. |
| Digital Interface | SPI (3-wire serial) | SPI (3-wire serial) | Determines compatibility with the host microcontroller's communication bus and firmware protocol. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Must match the system power rail to ensure proper operation and logic-level compatibility. |
| Package | 14-lead TSSOP | 14-lead TSSOP | Affects PCB footprint and assembly compatibility for drop-in replacement. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Ensures the device meets the environmental requirements of the target application. |
| Number of Wiper Positions per Channel | 256 (4 channels) | 256 (2 channels) | Combined with channel count, defines the total number of independently programmable resistance settings available. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8403ARUZ1 | AD8402ARU100 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 4 | 2 |
| Number of Taps | 256 | 256 |
| Resistance(Ohms) | 1k | 100k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±33% | ±30% |
| Temperature Coefficient(Typ) | 700ppm/°C | 500ppm/°C |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Features | Cascade Pin | - |
Frequently asked questions
What are the key differences between the AD8403ARUZ1 and AD8402ARU100?
The AD8403ARUZ1 is a quad-channel digital potentiometer with a 1 kΩ end-to-end resistance, while the AD8402ARU100 is a dual-channel digital potentiometer with a 100 kΩ end-to-end resistance. Both are 8-bit devices in a 14-lead TSSOP package, but they differ in channel count and resistance value.
Are the AD8403ARUZ1 and AD8402ARU100 pin-compatible?
No. Although both devices are offered in a 14-lead TSSOP package, the AD8403ARUZ1 provides four independent potentiometer channels while the AD8402ARU100 provides only two, so the pin functions and internal channel assignments differ. They should not be treated as drop-in replacements without verifying the pinout against the respective datasheets.
What is the resolution of the AD8403ARUZ1 and AD8402ARU100?
Both devices are 8-bit digital potentiometers, providing 256 wiper positions (0 to 255) per channel, as specified in the Analog Devices AD8402/AD8403 datasheet.
What supply voltage range do the AD8403ARUZ1 and AD8402ARU100 support?
Both devices operate from a single supply of 2.7 V to 5.5 V, per the Analog Devices AD8402/AD8403 datasheet. The digital interface logic levels are compatible with the supply voltage used.
How does the end-to-end resistance differ between the two parts?
The AD8403ARUZ1 has a 1 kΩ nominal end-to-end resistance, while the AD8402ARU100 has a 100 kΩ nominal end-to-end resistance. This affects wiper current handling, power dissipation, and the RC time constants in the target circuit, so the resistance value must be selected for the application.
What digital interface do the AD8403ARUZ1 and AD8402ARU100 use?
Both devices use a 3-wire SPI-compatible serial interface (CS, SDI, SCLK) for programming the wiper positions, as described in the Analog Devices AD8402/AD8403 datasheet.
Can the AD8403ARUZ1 be used as a replacement for the AD8402ARU100 in an existing design?
Not directly. The AD8403ARUZ1 has four channels versus two on the AD8402ARU100, and its 1 kΩ resistance differs from the 100 kΩ of the AD8402ARU100. A replacement requires verifying channel count, resistance, pinout, and circuit behavior against the manufacturer datasheets before substitution.