What is the difference between LT, LTC, and LTM prefixes for Linear Technologies' parts?
As per Ordering Info document:


  Product Designator
  a. LT indicates a proprietary bipolar device
  b. LTC indicates a proprietary CMOS device
  c. LTM indicates a proprietary μModule device
  d. RH indicates a LTC radiation tolerant device
  e. OP and REF are second source devices