Part A
AD8402ARZ100
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 1274 PCS
- Package
- SOIC-14
- Series
- Acquisition de données - potentiomètres numériques
Replacement verdict
Compatible functional replacement candidate
The AD8402ARZ100 and AD8402AR100 are functionally equivalent dual-channel digital potentiometers sharing identical resistance, resolution, interface, and package characteristics; the RoHS-compliant Z-grade variant is a suitable drop-in replacement for the non-Z version in most designs, subject to confirming lead-free solder process compatibility.
Resistance Value
High match
Resolution
High match
Package Type
High match
RoHS Compliance
Validation required
Parts at a glance
Part B
AD8402AR100
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6475 PCS
- Package
- SOIC-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 | AD8402ARZ100 | AD8402AR100 | Why it matters |
|---|---|---|---|
| Package / Mounting | 14-Lead SOIC (surface mount) | 14-Lead SOIC (surface mount) | Both use the same SOIC footprint, so board-level physical compatibility is maintained. |
| RoHS / Lead-Free Status | RoHS compliant, lead-free (Z suffix) | Non-RoHS, contains lead (no Z suffix) | The Z suffix denotes lead-free/RoHS construction; this affects regulatory compliance and solder process requirements. |
| Number of Resistors / Channels | 2 (dual channel) | 2 (dual channel) | Channel count determines how many independent digital potentiometer elements are available in the circuit. |
| End-to-End Resistance | 100 kΩ | 100 kΩ | The nominal resistance sets the range of the potentiometer and must match for functional equivalence. |
| Resolution | 8-bit (256 positions) | 8-bit (256 positions) | Resolution defines the number of wiper tap steps and thus the adjustment granularity. |
| Interface | SPI (3-wire serial) | SPI (3-wire serial) | The digital interface must match the host controller for the device to be driven correctly. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Operating voltage range must be compatible with the system supply for proper operation. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range determines suitability for the target application environment. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8402ARZ100 | AD8402AR100 |
|---|---|---|
| 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 | 100k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±30% | ±30% |
| 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 is the primary difference between the AD8402ARZ100 and the AD8402AR100?
The primary difference is the package and ordering suffix. The AD8402ARZ100 is supplied in a lead-free, RoHS-compliant 14-lead SOIC package (indicated by the "Z" suffix), while the AD8402AR100 is the older non-RoHS version in the same 14-lead SOIC package. Both are dual-channel, 100 kΩ digital potentiometers with identical electrical specifications.
Are the AD8402ARZ100 and AD8402AR100 electrically and functionally interchangeable?
Yes. Both devices are dual-channel, 256-position digital potentiometers with a 100 kΩ end-to-end resistance, 8-bit SPI-compatible serial interface, and the same 14-lead SOIC pinout. The only difference is the RoHS/lead-free status of the package, so they are functionally interchangeable in the same PCB footprint.
What is the end-to-end resistance and resolution of these devices?
Both the AD8402ARZ100 and AD8402AR100 have a nominal end-to-end resistance of 100 kΩ and provide 256 wiper positions (8-bit resolution), yielding a nominal wiper resistance step of approximately 390 Ω per LSB.
What supply voltage and interface do the AD8402ARZ100 and AD8402AR100 require?
Both parts operate from a single 2.7 V to 5.5 V supply and use a 3-wire SPI-compatible serial interface (CS, SDI, SCLK) for programming the wiper positions. They also feature a shutdown pin and a reset capability via the serial interface.
Is the AD8402ARZ100 a drop-in replacement for the AD8402AR100 in existing designs?
Yes, from a footprint and functional standpoint. The AD8402ARZ100 uses the same 14-lead SOIC package and pinout as the AD8402AR100, so it can be used as a drop-in replacement. The "Z" suffix denotes lead-free/RoHS compliance, which may be required for new designs but does not affect electrical operation.
Which part should be selected for a new RoHS-compliant design?
The AD8402ARZ100 should be selected for new designs requiring RoHS compliance, as the "Z" suffix indicates a lead-free, RoHS-compliant package. The AD8402AR100 is the non-RoHS legacy version and is generally not recommended for new designs with RoHS requirements.
Do both parts share the same operating temperature range and package type?
Yes. Both the AD8402ARZ100 and AD8402AR100 are specified over the industrial temperature range of −40 °C to +85 °C and are offered in the same 14-lead SOIC package. The package body and pin configuration are identical; only the lead finish/RoHS status differs.