Semtech EZ1085CM-3.3 TR: A Classic 3.3 V 3 A Linear Regulator in TO-263

The EZ1085CM-3.3 TR is a fixed 3.3 V positive linear regulator rated for 3 A. ChipApex lists it under Semtech with a TO-263 (D2PAK) outline on tape and reel. Maximum input is 7 V, dropout is about 1.35 V at 3 A, quiescent current is roughly 14 mA and PSRR is around 72 dB at 120 Hz.

Parts in the EZ1085 family have a long history that overlaps National Semiconductor and later Texas Instruments branding. For BOM control, treat the manufacturer field, the package marking and the tape-and-reel suffix as three separate checks, because cross-listings are common on this family.

A 3 A LDO is useful when noise matters more than efficiency: FPGA I/O rails, analog front ends and clock clean-up stages after a switching pre-regulator. Allow enough headroom for dropout plus ripple, and size the tab copper so that junction temperature stays inside the 0–70 °C commercial rating for this grade.

Typical application notes call for input and output capacitors close to the pins. Follow the datasheet ESR window; some older LDO families oscillate with ultra-low-ESR ceramic-only banks unless a small series resistance or a parallel electrolytic is added.

Ask for RoHS evidence and date codes when you buy surplus or independent stock, and verify that the CM-3.3 marking matches a fixed 3.3 V device rather than an adjustable sibling.

Full specifications, pricing and stock for the Semtech EZ1085CM-3.3 TR 3.3 V 3 A LDO are on ChipApex, an independent electronic components distributor based in Shenzhen. Catalog home: ChipApex.

Further reading

Other ChipApex component notes: - Related ChipApex component note - Related ChipApex component note - Related ChipApex component note - Related ChipApex component note - Related ChipApex component note - Related ChipApex component note - Related ChipApex component note - Related ChipApex component note - Related ChipApex component note