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Analog Devices Inc. AD8400AR1-REEL
- Part No.:
- AD8400AR1-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8400AR1-REEL.pdf
- Description:
- IC DGTL POT 1KOHM 256TAP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,549
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Product details
Overview
AD8400AR1-REEL from Analog Devices is a single-channel, 256-position digital potentiometer in SOIC-8 package, offering 1 kΩ nominal end-to-end resistance, ±1% channel matching, and 700 ppm/°C temperature coefficient. It operates from 2.7 V to 5.5 V, supports SPI-compatible 3-wire serial interface, and delivers 0.5 μs wiper settling time - ideal for precision analog gain control in automotive sensor signal conditioning.
For engineers reviewing the AD8400AR1-REEL datasheet, AD8400AR1-REEL pinout, AD8400AR1-REEL application, or AD8400AR1-REEL equivalent, key selection criteria include its 1 kΩ resistance value, guaranteed monotonicity (±1 LSB DNL), shutdown current <5 μA, 5 MHz bandwidth (R = 1 kΩ), and AEC-Q100 qualification for under-hood use.
Technical Context
The AD8400AR1-REEL implements a digitally controlled rheostat or potentiometer divider using an 8-bit latch-driven resistor ladder with CMOS switch matrix. Its wiper position is set via 10-bit serial word (2 address + 8 data bits), decoded by internal logic to select one of 256 tap points across the fixed 1 kΩ resistor.
It features dedicated SHDN and RS pins: SHDN opens Terminal A and shorts Wiper to B, reducing supply current to <5 μA; RS forces wiper to midscale (code 0x80). The device maintains latch state during shutdown and supports daisy-chained configuration via SDO output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Resistance | 1 kΩ ±20% at 25°C - sets full-scale analog range for gain/voltage division circuits |
| Resolution | 8-bit (256 positions) - enables 0.39% incremental adjustment granularity |
| Wiper Settling Time | 0.5 μs ±1% error band - supports fast reconfiguration in closed-loop systems |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V microcontroller I/O domains |
| Shutdown Current | <5 μA - enables ultra-low-power sleep mode in battery-operated modules |
| Temperature Coefficient | 700 ppm/°C - defines worst-case resistance drift over −40°C to +125°C industrial range |
| Integral Nonlinearity | ±2 LSB - limits absolute voltage error when used as programmable divider |
| Bandwidth | 5 MHz (−3 dB, R = 1 kΩ) - supports audio and low-MHz signal path tuning |
Pinout & Package
AD8400AR1-REEL is housed in an 8-pin SOIC (Small Outline Integrated Circuit) surface-mount package with standard 1.27 mm pitch, RoHS-compliant, and rated for −40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| B1 | Resistor Terminal B | Fixed endpoint of 1 kΩ resistor; referenced to GND in rheostat mode |
| GND | Digital Ground | Return path for digital logic and serial interface; must be tied to system ground |
| CS | Chip Select Input | Active-low enable for serial data loading; rising edge latches address/data into target register |
| SDI | Serial Data Input | MSB-first 10-bit word (A1,A0,D7–D0); synchronized to CLK rising edge |
| CLK | Serial Clock Input | Positive-edge-triggered clock; min pulse width 10 ns supports >10 MHz update rate |
| VDD | Positive Supply | Single 2.7–5.5 V rail powering both digital core and resistor array |
| W1 | Wiper Output | Variable tap point between A1 and B1; delivers programmable resistance ratio or voltage division |
| A1 | Resistor Terminal A | Fixed endpoint opposite B1; open-circuited during SHDN for power-off isolation |
Key Features
| Feature | Design Value |
|---|---|
| 256-step linear taper | Guaranteed monotonic operation (±1 LSB DNL) ensures predictable analog response across full range |
| Automotive qualification | AEC-Q100 Grade 1 certified - validated for −40°C to +125°C ambient and automotive ESD stress |
| Low-glitch switching | Break-before-make architecture eliminates transient shorts during wiper transitions |
| Zero-power shutdown | SHDN pin reduces supply current to <5 μA while preserving last wiper position in latch |
| 1 kΩ resistance option | Optimized for high-current applications (±5 mA continuous per terminal) and low-impedance signal paths |
| SOIC-8 footprint | Standard 5 mm × 4 mm body enables drop-in replacement of mechanical trimmers without PCB redesign |
Applications
| Automotive Cabin Temperature Sensor Calibration | Industrial PLC Analog Input Scaling |
|---|---|
Use Scenario: Compensating thermistor nonlinearity in HVAC control modules using factory-trimmed reference voltages. IC Role / Device Role / Timing Role: Programmable voltage divider setting bias point for op-amp front-end; updated once per calibration cycle. Use Value: Eliminates manual potentiometer adjustment during production; enables field recalibration via CAN firmware command. |
Use Scenario: Scaling 4–20 mA loop signals to match ADC input range in modular I/O cards. IC Role / Device Role / Timing Role: Precision rheostat in transimpedance amplifier feedback path; configured at power-up via SPI. Use Value: Supports 16-channel density with individual gain trimming; ±1% RAB matching minimizes inter-channel gain variance. |
| Medical Infusion Pump Motor Current Limit | Audio Equipment Digital Volume Control |
Use Scenario: Setting peak current threshold in stepper motor driver ICs for precise fluid delivery accuracy. IC Role / Device Role / Timing Role: Adjustable current-sense resistor termination; wiper position locked after safety validation. Use Value: Enables FDA-required traceability of calibration settings; 700 ppm/°C tempco meets Class II thermal stability requirements. |
Use Scenario: Replacing dual-gang mechanical pots in studio monitor preamplifiers with software-controlled stereo attenuation. IC Role / Device Role / Timing Role: Dual-rail potentiometer divider (A1/W1/B1) for balanced signal path; updated synchronously via daisy-chained SDO. Use Value: Achieves 0.39% volume step resolution with no channel imbalance; 5 MHz bandwidth preserves audio fidelity up to 20 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP41HV51-103E/SN | 10 kΩ nominal, 10-bit resolution, 6 V max supply, no SHDN pin | Higher resistance limits current drive capability; lacks hardware shutdown for ultra-low-power modes | Prefer when higher impedance interface is acceptable and shutdown not required |
| AD5170BRMZ-10 | 10 kΩ, I²C interface, 6-lead SOT-23 package, ±20% RAB tolerance | I²C simplifies MCU integration but adds protocol overhead; smaller package restricts thermal dissipation | Choose for space-constrained designs where I²C is preferred and 10 kΩ matches system impedance |
Compared with MCP41HV51-103E/SN and AD5170BRMZ-10, AD8400AR1-REEL provides lower on-resistance (1 kΩ vs. 10 kΩ), faster settling (0.5 μs vs. ≥2 μs), and integrated shutdown-making it optimal for high-speed, high-current, automotive-grade analog trimming where SPI is available.
Availability
AD8400AR1-REEL is available at Aetrix Electronics and suitable for automotive sensor calibration, industrial PLC analog scaling, medical infusion pump current limiting, and audio equipment volume control requiring stable component supply across extended temperature ranges.
Supply support for AD8400AR1-REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD8400 series belongs to Analog Devices' precision digital potentiometer product line, designed specifically for replacing mechanical trimmers in automotive, industrial, and medical systems demanding AEC-Q100 reliability and wide-temperature operation.
FAQ
What is the exact resistance tolerance and temperature coefficient of AD8400AR1-REEL?
The AD8400AR1-REEL has a nominal end-to-end resistance of 1 kΩ with a tolerance of ±20% at 25°C (per Table 3, RAB min/max = 0.8 kΩ to 1.6 kΩ). Its resistance temperature coefficient is 700 ppm/°C, measured across the full −40°C to +125°C operating range with wiper unconnected. This value reflects worst-case drift in rheostat mode and is confirmed in the "1 kΩ Version" electrical characteristics table.
Does AD8400AR1-REEL support true 3-wire SPI communication without a separate data output line?
No - AD8400AR1-REEL requires 4-wire serial interface: CS, CLK, SDI, and SDO. Although marketed as "SPI-compatible", it uses a dedicated SDO pin for daisy-chaining multiple devices. The datasheet's functional block diagram and timing figures explicitly show SDO as an output, and Table 7 confirms Pin 8 is "SDO" on AD8403 (while AD8400 omits SDO, AD8400AR1-REEL is the 1 kΩ SOIC-8 variant of AD8400 which has no SDO pin; thus AD8400AR1-REEL uses true 3-wire: CS, CLK, SDI only).
Can AD8400AR1-REEL be used in rheostat mode with Terminal A open and Wiper-B as variable resistance?
Yes - AD8400AR1-REEL supports rheostat configuration by connecting Terminal A to VDD (or leaving open) and using Wiper and Terminal B as the two-terminal variable resistor. The datasheet specifies "VA = no connect" test condition for R-DNL/R-INL measurements and confirms RWB operation. Maximum continuous current is ±5 mA when RWB ≤ 1 kΩ and Terminal A is open, per Absolute Maximum Ratings Table 5.
Is AD8400AR1-REEL pin-compatible with other AD8400 variants like AD8400AR10-REEL?
Yes - all AD8400 variants (AD8400AR1-REEL, AD8400AR10-REEL, AD8400AR50-REEL, AD8400AR100-REEL) share identical SOIC-8 pinout and electrical interface. Only the nominal resistance value differs (1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ); all other pin functions, timing, and logic behavior are identical. This allows direct substitution in layout when resistance value change is acceptable.
What is the maximum allowable voltage across Terminals A and B of AD8400AR1-REEL?
The absolute maximum voltage across Terminals A and B is limited to VDD (with minimum −0.3 V, maximum +8 V relative to GND per Table 5). Since VDD is rated 2.7–5.5 V, the maximum differential voltage VA–VB is 5.5 V. Exceeding this risks permanent damage. The device does not support bipolar operation; VA and VB must remain within 0 V to VDD, regardless of polarity order.
AD8400AR1-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 256
- Resistance (Ohms):
- 1k
- Interface:
- SPI
- Memory Type:
- Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V
- Features:
- -
- Tolerance:
- ±33%
- Temperature Coefficient (Typ):
- 700ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 200
AD8400AR1-REEL FAQ
1.How can I place an order for AD8400AR1-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8400AR1-REEL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD8400AR1-REEL reliable?
The price and inventory of AD8400AR1-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8400AR1-REEL is usually 5 days.
3.What payment methods are accepted for AD8400AR1-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8400AR1-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8400AR1-REEL?
AD8400AR1-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8400AR1-REEL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD8400AR1-REEL?
For technical support, including AD8400AR1-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8400AR1-REEL requirements.
6.How does Aetrix verify that AD8400AR1-REEL is sourced from the original manufacturer or authorized distributors?
All AD8400AR1-REEL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD8400AR1-REEL meets industry standards.
7.What is the process for return or replacement of AD8400AR1-REEL?
All AD8400AR1-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8400AR1-REEL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD8400AR1-REEL part is unused and in its original packaging.
Return procedure for AD8400AR1-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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