19-1848; Rev 0; 10/00
Low-Drift Digital Potentiometers in SOT23
The MAX5400/MAX5401 digital potentiometers offer
256-tap SOT-PoT™ digitally controlled variable resis-
tors in tiny 8-pin SOT23 packages. Each device func-
tions as a mechanical potentiometer, consisting of a
fixed resistor string with a digitally controlled wiper con-
tact. They operate from +2.7V to +5.5V single-supply
voltages and use an ultra-low supply current of 0.1µA.
These devices also provide glitchless switching
between resistor taps, as well as a convenient power-
on reset that sets the wiper to the midscale position at
power-up. A low 5ppm/°C ratiometric temperature coef-
ficient makes it ideal for applications requiring low drift.
The MAX5400/MAX5401 serve well in applications
requiring digitally controlled resistors, including
adjustable voltage references and programmable gain
amplifiers (PGAs). A nominal end-to-end resistor tem-
perature coefficient of 50ppm/°C allows these parts to
be used as variable resistors in applications such as
low-tempco adjustable gain and other circuit configura-
Two resistance values are available: 50kΩ (MAX5400)
and 100kΩ (MAX5401). Each device is guaranteed over
the extended industrial temperature range (-40°C to
Mechanical Potentiometer Replacement
Adjustable Voltage References
o Miniature 8-Pin SOT23 (3mm x 3mm)
o 256 Tap Positions
o Ultra-Low 0.1µA Supply Current
o Single-Supply Operation: +2.7V to +5.5V
o Low Ratiometric Temperature Coefficient:
o Power-On Reset: Wiper Goes to Midscale
o Glitchless Switching Between the Resistor Taps
o 3-Wire SPI™-Interface Compatible
o 50kΩ/100kΩ Resistor Values
MAX5400EKA-T -40°C to +85°C
MAX5401EKA-T -40°C to +85°C
SOT-PoT is a trademark of Maxim Integrated Products.
SPI is a trademark of Motorola, Inc.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.