Part A
AD8400AR100
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 9927 個数
- Series
- データ取得 - デジタルポテンショメータ
Replacement verdict
Compatible functional replacement candidate
The AD8400ARZ10 and AD8400AR100 are both single-channel digital potentiometers from the AD8400 family in the same SOIC-8 package, sharing identical pinout, supply range, and interface. The only meaningful distinction is the end-to-end resistance (10 kΩ versus 100 kΩ), so substitution is viable only when the circuit's resistance and wiper-current requirements are re-evaluated for the new value.
End-to-End Resistance
Not compatible
Package Type
High match
Supply Voltage Range
High match
Control Interface
High match
Parts at a glance
Part B
AD8400ARZ10
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5319 個数
- Package
- SOIC-8
- Series
- データ取得 - デジタルポテンショメータ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8400ARZ10 | AD8400AR100 | Why it matters |
|---|---|---|---|
| End-to-End Resistance | 10 kΩ | 100 kΩ | Sets the nominal resistance range of the digital potentiometer; a 10x difference directly changes the current/voltage scaling in the circuit and prevents direct substitution without redesign. |
| Number of Positions (Taps) | 256 | 256 | Determines the resolution of wiper adjustment; identical tap count means the same number of discrete steps is available in both parts. |
| Number of Potentiometers | 1 | 1 | Indicates a single-channel device in both cases, so channel count does not affect interchangeability. |
| Interface Type | SPI (3-wire serial) | SPI (3-wire serial) | Both use the same serial control interface, so the host microcontroller firmware and wiring are compatible. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical operating supply range means both parts work in the same system power domain. |
| Supply Current | 10 µA (typical) | 10 µA (typical) | Low and equal quiescent current keeps power budget unchanged when swapping parts. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range ensures both parts meet the same environmental requirements. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Identical package and footprint allow a drop-in PCB replacement without layout changes. |
| Wiper Resistance | ~50 Ω (typical) | ~100 Ω (typical) | Wiper resistance affects the minimum achievable resistance and accuracy; the higher value in the 100 kΩ part slightly changes end-to-end behavior. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8400AR100 | AD8400ARZ10 |
|---|---|---|
| Part Status | Obsolete | Active |
| Digi Key Programmable | Not Verified | - |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 1 | 1 |
| Number of Taps | 256 | 256 |
| Resistance (Ohms) | 100k | - |
| Interface | SPI | SPI |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | ±30% | ±20% |
| Temperature Coefficient (Typ) | 500ppm/°C | - |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Resistance - Wiper (Ohms) (Typ) | 200 | - |
| Base Product Number | AD8400 | - |
| Resistance(Ohms) | - | 10k |
| Temperature Coefficient(Typ) | - | 500ppm/°C |
Frequently asked questions
What is the main difference between the AD8400ARZ10 and AD8400AR100?
The primary difference is the end-to-end resistance value of the digital potentiometer. The AD8400ARZ10 has a 10 kΩ nominal resistance, while the AD8400AR100 has a 100 kΩ nominal resistance. Both are single-channel, 256-position digital potentiometers in an 8-lead SOIC package.
Are the AD8400ARZ10 and AD8400AR100 pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package and share the same pinout, including the 3-wire SPI-compatible serial interface, A, B, and W terminals, VDD, and GND. They can occupy the same PCB land pattern.
Do both parts have the same number of resistance positions?
Yes. Both the AD8400ARZ10 and AD8400AR100 are 256-position digital potentiometers, providing 8-bit resolution over the full resistance range. The wiper can be set to any of 256 discrete tap points via the serial interface.
Can the AD8400ARZ10 be replaced by the AD8400AR100 in an existing design?
Not without validation. Although pin-compatible and functionally similar, the 10× higher end-to-end resistance of the AD8400AR100 changes the wiper resistance ratio, power dissipation, and the RC time constants in the surrounding circuit. The replacement must be verified against the target application requirements using the manufacturer datasheet.
What supply voltage range do the AD8400ARZ10 and AD8400AR100 support?
Both devices operate from a single supply of 2.7 V to 5.5 V, as specified in the Analog Devices AD8400 datasheet. The digital interface levels are compatible with the supply voltage.
How does the resistance tolerance compare between the two variants?
Both the AD8400ARZ10 and AD8400AR100 are specified with a nominal resistance tolerance of ±20% over the operating temperature range, per the Analog Devices datasheet. The absolute tolerance is the same percentage for both resistance options.
What is the typical power dissipation difference between the AD8400ARZ10 and AD8400AR100?
For a given applied voltage across the end-to-end terminals, power dissipation is inversely proportional to resistance. The AD8400AR100, with 10× the resistance of the AD8400ARZ10, dissipates approximately one-tenth the power of the AD8400ARZ10 under the same voltage across terminals A and B.