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MAX6385 Last Time Buy
The MAX6381–MAX6390 microprocessor (µP) supervisory circuits monitor power-supply voltages from +1.8V to +5.0V while consuming only 3µA of supply current...
Datasheet
MAX6385 on Analog.com

MAX6389 Production
The MAX6381–MAX6390 microprocessor (µP) supervisory circuits monitor power-supply voltages from +1.8V to +5.0V while consuming only 3µA of supply current...
Datasheet
MAX6389 on Analog.com

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Article What are the 4-pin SC70 package thermals for the MAX6385 to MAX6389 family of devices?

Answer: 
These devices are in the 4-pin SC70 package, package code X4+1
Thermal Impedance
Single-layer board
   Theta jA   = 327°C/W
   Theta jC  =  115°C/W
 
Multi-layer board
   Theta jA  =  322.60°C/W
   Theta jC  =  115°C/W