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Product Detailed Parameters
- Description：IC DGTL POT 100KOHM 256TAP SOT23
- Series：SOT-PoT™
- Mfr：Analog Devices Inc./Maxim Integrated
- Package：Tape & Reel (TR),Cut Tape (CT)
- Taper：Linear
- Configuration：Potentiometer
- Number of Circuits：1
- Number of Taps：256
- Resistance (Ohms)：100k
- Interface：SPI
- Memory Type：Volatile
- Voltage - Supply：2.7V ~ 5.5V
- Features：-
- Tolerance：±25%
- Temperature Coefficient (Typ)：50ppm/°C
- Mounting Type：Surface Mount
- Supplier Device Package：SOT-23-8
- Package / Case：SOT-23-8
- Operating Temperature：-40°C ~ 85°C
- Resistance - Wiper (Ohms) (Typ)：250
- Grade：-
- Qualification：-
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Overview
The MAX5401EKA+T is a 256-tap digitally controlled variable resistor housed in an 8-pin SOT-23 package. It operates on a single supply voltage ranging from +2.7V to +5.5V with an ultra-low supply current of 0.1µA at VDD = 2.7V. The device features a nominal end-to-end resistance of 100kΩ and a low ratiometric temperature coefficient of 5ppm/°C. It includes glitchless switching between taps and a power-on reset function that initializes the wiper to the midscale position (code 128). The component supports a 3-wire SPI-compatible interface for digital control.
Feature Summary
- 256-tap resolution with 100kΩ end-to-end resistance
- Ultra-low supply current of 0.1µA at 2.7V
- Glitchless switching and power-on reset to midscale
- Low ratiometric temperature coefficient of 5ppm/°C
Applications
- Mechanical potentiometer replacement
- Low-drift programmable gain amplifiers (PGAs)
- Adjustable voltage references
Procurement Notes
Verify the manufacturer designation, as Analog Devices Inc. acquired Maxim Integrated. Confirm the specific ordering suffix matches the required tape-and-reel packaging format. Ensure the component meets the extended industrial temperature range specifications (-40°C to +85°C) required for the intended application environment.
Selection Notes
Select the MAX5401EKA+T when a 100kΩ resistance value is required; use the MAX5400 variant for 50kΩ applications. This component is suitable for designs requiring minimal quiescent current and precise digital adjustment of resistance without mechanical wear. Ensure the system interface supports the 3-wire serial protocol with appropriate voltage levels for CS, DIN, and SCLK pins.
Part Context
This part belongs to the MAX5400/MAX5401 family of SOT-PoT™ devices. These components are designed to replace traditional mechanical potentiometers in space-constrained applications. The series offers high reliability through solid-state operation and is manufactured using BiCMOS technology, containing 3769 transistors within the miniature 8-pin SOT-23 footprint.
Replacement Considerations
The MAX5400EKA+T serves as the direct functional substitute for designs requiring a 50kΩ resistance value instead of 100kΩ. Both parts share identical pinouts, package dimensions, and electrical characteristics except for the nominal end-to-end resistance.
FAQ
What is the default wiper position upon power-up?
The internal power-on reset circuitry sets the wiper to the midscale position, corresponding to input code 128.
How does the device handle switching between resistor taps?
The MAX5401 provides glitchless switching between resistor taps, preventing transient spikes in resistance during digital updates.
What is the maximum continuous current allowed into the H, L, and W pins?
The absolute maximum rating specifies a continuous current limit of ±1mA into pins H, L, and W.
