Overview of Voltage Regulator Options
The features and specifications of popular voltage regulator options including REF4132, REF35, REF34xxT, and LM4121-ADJ. Find out about adjustable output voltage options, operating temperature ranges, package details, and more. Discover the best replacement options and considerations for each regulator.
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REF4132 vs REF35 vs REF34xxT vs LM4121-ADJ 1
REF35 vs REF4132 vs REF34xxT vs LM4121A-ADJ LM4121AIM5- ADJ/NOPB Specifications REF35 REF4132 REF34xxT 1.024 V, 1.2 V, 1.25 V, 1.6 V, 1.7 V, 1.8 V, 2.048 V, 2.5 V, 3 V, 3.3 V, 4.096 V, 5 V 2.5 V, 3 V, 3.3 V, 4.096 V, 5 V 2.5 V, 3 V, 3.3 V, 4.096 V, 5 V Adjustable Output Voltage Options 6 V 5.5 V 12 V 12 V Vin (Max) 0.05% 0.05% 0.05% 0.2% Initial Accuracy (Max) A grade: 12 ppm/ C B grade: 30 ppm/ C -40 C to 125 C 12 ppm/ C (-40 C to 105 C) 6 ppm/ C (-40 C to 125 C) 50 ppm/ C Temp-co Drift (Max) -40 C to 125 C -40 C to 125 C -40 C to 85 C Operating Temp Range 1.3 A (85 C) +10 mA, -5 mA 3.3 ppmp-p or 3.8 ppmp-p 70 ppm 100 A 10 mA 15 ppmp-p 35 ppm 95 A (125 C) 10 mA 3.8 ppmp-p 30 ppm 275 A (85 C) 5 mA ~16 ppmp-p 500 ppm Quiescent Current Output Current Noise (0.1 Hz to 10 Hz) Thermal Hysteresis (Cycle 1) 40 ppm 30 ppm 25 ppm 100 ppm Long Term Drift (1000 hours) 0.1 F to 10 F 0.1 F to 10 F 0.1 F to 10 F 0.022 F to 0.047 F Output Cap 0.1 F min 1 F to 10 F 1 F to 10 F Not required Input Cap 6SOT-23 5SOT-23 6SOT-23 5SOT-23 Package 2
Best option: REF4132 https://www.ti.com/product/REF4132 REF4132 can be a drop in replacement if the following conditions are met: Resistors connected to ADJ pin on LM4121 can be removed in order to allow this pin to be left floating on REF4132 The appropriate output and input capacitors can be soldered onto the board for REF4132 You are okay with one of the following voltage options in the table below REF4132 Remove any resistors attached to pin 1 in order to leave pin 1 floating 3
Option with most voltage variants: REF35 https://www.ti.com/product/REF35 REF35 can be a drop in replacement if the following conditions are met: Resistors connected to ADJ pin on LM4121 can be removed in order to allow this pin to be left floating on REF35 The appropriate output and input capacitors can be soldered onto the board for REF4132 There are no vias or other board features that would make contact with pin 5 of REF35 You are okay with one of the following voltage options in the table below Remove any resistors attached to pin 1 in order to leave pin 1 floating *** GND pins internally connected, only one must be connected to ground. NR pin can be left floating REF35 also has an ultra-small (1.05 mm x 0.84 mm) not pin-to-pin package option, if interested. 4 ***REF35 also has a 1.7 V option available.
Option with the best max input voltage: REF34xxT https://www.ti.com/product/REF3425 REF34xxT (max input voltage 12 V) can be a drop in replacement if the following conditions are met: Resistors connected to ADJ pin on LM4121 can be removed in order to allow this pin to be left floating on REF34xxT The appropriate output and input capacitors can be soldered onto the board for REF34xxT There are no vias or other board features that would make contact with pin 5 of REF34xxT You are okay with one of the following voltage options in the table below Remove any resistors attached to pin 1 in order to leave pin 1 floating NC pin can be left floating 5
