Part A
AD8402ARU10
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5184 PCS
- Package
- TSSOP-14
- Series
- Acquisition de données - potentiomètres numériques
Replacement verdict
Compatible functional replacement candidate
The AD8402ARU10 and AD8402ARU100 share the same dual-channel digital potentiometer architecture, TSSOP-14 package, and interface, making them functionally interchangeable in most designs. The primary distinction is the end-to-end resistance value, which directly affects circuit gain, attenuation, and current levels, so the replacement is viable only when the surrounding network is recalibrated for the 10 kΩ versus 100 kΩ resistance.
End-to-End Resistance
Not compatible
Package Type
High match
Channel Count
High match
Interface Type
High match
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 | AD8402ARU10 | AD8402ARU100 | Why it matters |
|---|---|---|---|
| End-to-End Resistance | 10 kΩ | 100 kΩ | The total resistance directly sets the current and signal attenuation range of the potentiometer, so the two parts are not interchangeable in a given circuit without redesign. |
| Number of Resistors / Channels | 2 | 2 | Both devices provide two independent digitally controlled resistors, so channel count is identical and does not affect substitutability. |
| Resolution (Number of Taps) | 256 positions (8-bit) | 256 positions (8-bit) | Tap resolution determines the step size of resistance adjustment; identical 8-bit resolution means the same control granularity. |
| Interface Type | SPI (3-wire serial) | SPI (3-wire serial) | The digital control interface must match the host controller; both use the same serial protocol, so firmware and wiring are compatible. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Operating supply range must be compatible with the system rail; identical ranges allow the same power design. |
| Package / Mounting | 14-lead TSSOP | 14-lead TSSOP | Package and footprint must match for board-level drop-in replacement; both share the same TSSOP-14 outline. |
| Nominal Resistance Tolerance | ±20% (typical for 10 kΩ option) | ±30% (typical for 100 kΩ option) | Tolerance affects absolute resistance accuracy; the differing tolerances mean circuit calibration may differ between the two parts. |
| Wiper Resistance | Approx. 50 Ω (typical) | Approx. 100 Ω (typical) | Wiper resistance adds a fixed series error, which is more significant relative to a lower total resistance; this affects accuracy and load behavior. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment; identical ratings mean equal environmental suitability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8402ARU10 | AD8402ARU100 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Obsolete | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 2 |
| Number of Taps | 256 | 256 |
| Resistance(Ohms) | 10k | 100k |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±20% | ±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 main difference between the AD8402ARU10 and AD8402ARU100?
The primary difference is the end-to-end resistance value of the internal RDAC. The AD8402ARU10 provides a 10 kΩ nominal resistance, while the AD8402ARU100 provides a 100 kΩ nominal resistance. Both are dual-channel, 256-position digital potentiometers in a TSSOP-14 package.
Are the AD8402ARU10 and AD8402ARU100 pin-compatible?
Yes. Both devices are offered in the same 14-lead TSSOP (RU-14) package and share the same pinout, including the serial interface, address pins, and A/B/wiper terminals for both channels. They can occupy the same PCB footprint.
Do both parts use the same digital interface and resolution?
Yes. Both are 256-position (8-bit) digital potentiometers with a 3-wire SPI-compatible serial interface (CS, SDI, SDO/CLK), and both provide two independent RDAC channels in a single package.
How does the resistance value affect power consumption and bandwidth?
The AD8402ARU100 (100 kΩ) draws lower current through the resistor string than the AD8402ARU10 (10 kΩ) for a given applied voltage, reducing static power dissipation. Conversely, the lower-resistance AD8402ARU10 generally supports wider signal bandwidth and lower thermal noise, while the higher-resistance AD8402ARU100 is preferable where lower current draw is required.
Can the AD8402ARU10 and AD8402ARU100 be used interchangeably in a design?
They are functionally and pin-compatible, but they are not electrically identical. Substitution requires verifying that the circuit's gain, attenuation, loading, bandwidth, and power budget tolerate the 10:1 resistance difference. The resistance value directly affects divider ratios when loaded and the RC time constants in the application.
What supply voltage range do both devices support?
Both the AD8402ARU10 and AD8402ARU100 operate from a single 2.7 V to 5.5 V supply, making them suitable for 3 V and 5 V systems. Verify the specific datasheet revision for any derating or timing conditions at the chosen supply voltage.
What are the typical applications for each resistance option?
The AD8402ARU10 (10 kΩ) is commonly used where lower resistance and wider bandwidth are needed, such as programmable gain or filter tuning. The AD8402ARU100 (100 kΩ) is typically chosen for low-power trimming, offset adjustment, and applications where reduced current through the resistor string is important.