Part A
AD8402ARZ100
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1274 PCS
- Package
- SOIC-14
- Series
- Data Acquisition - Digital Potentiometers
Replacement verdict
Compatible functional replacement candidate
The AD8402ARZ100 and AD8402AR1 are both dual-channel, 8-bit digital potentiometers from the same AD8402 family, sharing identical package, pinout, and interface architecture. The AD8402ARZ100 offers a 100 kΩ end-to-end resistance, while the AD8402AR1 provides a 1 kΩ resistance, making them functionally interchangeable only where the circuit's resistance value can be adjusted accordingly. Designers should confirm the target resistance value and tolerance requirements before substituting.
Resolution
High match
Channel Count
High match
Package Type
High match
End-to-End Resistance
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8402ARZ100 | AD8402AR1 | Why it matters |
|---|---|---|---|
| End-to-End Resistance | 100 kΩ | 1 kΩ | The nominal resistance directly sets the current and signal range the digital potentiometer can handle; a 100x difference makes these parts non-interchangeable in most circuits. |
| Number of Potentiometers | 2 | 2 | Both devices provide two independent channels, so the channel count is compatible for dual-channel designs. |
| Resolution (Number of Positions) | 256 positions (8-bit) | 256 positions (8-bit) | Identical 8-bit resolution means the same number of wiper steps and the same digital control interface behavior. |
| Interface Type | SPI (3-wire serial) | SPI (3-wire serial) | Matching serial interfaces allow the same microcontroller firmware and bus wiring to be reused. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical supply range ensures both parts operate in the same system power domain. |
| Package / Mounting | 8-lead SOIC (surface mount) | 8-lead SOIC (surface mount) | Same package and footprint allow drop-in board placement without layout changes. |
| Wiper Resistance | Approx. 50 Ω (typical) | Approx. 50 Ω (typical) | Wiper resistance adds series error; while nominally similar, its relative impact is far larger for the 1 kΩ version, affecting accuracy. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both share the industrial temperature range, so environmental compatibility is equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8402ARZ100 | AD8402AR1 |
|---|---|---|
| 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 | 256 | 256 |
| Resistance(Ohms) | 100k | 1k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±30% | ±33% |
| Temperature Coefficient(Typ) | 500ppm/°C | 500ppm/°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 AD8402ARZ100 and the AD8402AR1?
The AD8402ARZ100 is a dual-channel, 100 kΩ digital potentiometer in a 14-lead SOIC package with a specified operating temperature range of −40°C to +125°C, and the "Z" suffix denotes RoHS-compliant lead-free construction. The AD8402AR1 is the same dual-channel AD8402 family device but configured with a 1 kΩ end-to-end resistance. Both share the same 256-position resolution, SPI-compatible serial interface, and 14-lead SOIC footprint, so the primary differences are end-to-end resistance value and RoHS/lead-free status.
Are the AD8402ARZ100 and AD8402AR1 pin-compatible?
Yes. Both devices are offered in the same 14-lead SOIC (R-14) package and share the identical pinout defined in the AD8402 datasheet, including the serial data input, clock, chip select, and the two potentiometer terminal sets. Pin compatibility allows a board designed for one resistance option to accept the other without layout changes, provided the circuit is re-evaluated for the new end-to-end resistance.
Can the AD8402ARZ100 be used as a drop-in replacement for the AD8402AR1?
Not directly without circuit validation. Although the package and pinout match, the end-to-end resistance differs by a factor of 100 (100 kΩ versus 1 kΩ). This changes the wiper current, the achievable adjustment range, and the interaction with surrounding resistors, so the designer must confirm that the 100 kΩ value satisfies the application's gain, attenuation, or bias requirements before substituting.
What is the resolution and number of positions of these digital potentiometers?
Both the AD8402ARZ100 and AD8402AR1 are 256-position (8-bit) digital potentiometers. Each device contains two independent potentiometers, and the wiper position is programmed through the SPI-compatible 3-wire serial interface, giving 256 discrete tap settings per channel.
What supply voltage and interface do the AD8402ARZ100 and AD8402AR1 require?
Both parts operate from a single supply in the 2.7 V to 5.5 V range and use a 3-wire SPI-compatible serial interface (SDI, SCLK, and CS) for programming the wiper registers. The digital interface is compatible with standard microcontroller SPI ports, and the devices also provide a shutdown function that opens the potentiometer terminals.
Does the "Z" suffix on the AD8402ARZ100 indicate RoHS compliance?
Yes. In Analog Devices' part numbering, the "Z" suffix designates a RoHS-compliant, lead-free package. The AD8402ARZ100 is therefore the lead-free/RoHS version, whereas the AD8402AR1 designation does not carry the Z suffix and should be checked against the manufacturer's ordering guide for its specific compliance status before use in RoHS-restricted assemblies.
What are the typical applications for choosing between the 1 kΩ and 100 kΩ versions?
The 1 kΩ AD8402AR1 is generally suited to lower-impedance signal paths where a small end-to-end resistance and higher wiper current are acceptable, while the 100 kΩ AD8402ARZ100 is typically chosen for higher-impedance circuits where lower power dissipation and reduced loading of the source are desired. Selection should be based on the required adjustment range, wiper current limits, and the impedance of the surrounding network as specified in the AD8402 datasheet.