I am unable to figure out what difference is between the following part numbers, poring over the data sheet has shown no discernable difference and/or no mention of what the suffixes mean although they are both listed. Looking through Digikey pages I am also unable to exactly pin down what differences there are between the two part numbers and they even show up as an 'exact' match in siliconexpert. I am hoping someone has some sort of information on what these differences may be.

Information directly from data sheet

Is there a difference? Is this listed somewhere? I can see that the HFE and MPFE variants have different temperature requirements, but is there any difference between the EFE and IFE, and if not why are there two separate part numbers?

LTC3612 Data sheet - last rev May '18

  • \$\begingroup\$ Thanks for the spellcheck on poring, Null. \$\endgroup\$ Dec 20, 2021 at 22:44

1 Answer 1


The difference between the I vs. E is explained in Note 2 on page 4:

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This is the relevant text:

Note 2: ...The LTC3612E is guaranteed to meet performance specifications from 0°C to 85°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC3612I is guaranteed over the full –40°C to 125°C operating junction temperature range...

The I is guaranteed over the full -40°C to 125°C range, whereas the E is only guaranteed from 0°C to 85°C. The E will still work over the full range and will probably be in spec, but it is not guaranteed to be.


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