MIL- STD-883F 2004 TEST METHOD STANDARD MICROCIRCUITS - 第439页
MIL-STD-883F METHOD 2032.2 18 June 2004 33 C lass H Cla ss K 3.1.7 d. (Conti nued.) NOTE: This cri teri on does not appl y to the las t rung of a r esis tor l adder if the las t rung is i nacti ve (see f igure 2032- 29h)…
MIL-STD-883F
METHOD 2032.2
18 June 2004
32
Class H Class K
3.1.7 d. (Continued.)
NOTE: This criteria does not apply to the
second rung of a resistor loop since the
second rung is inactive. This criteria
does not apply to a fine loop or to a
resistor structure that is comprised of fine
loops (see figure 2032-28h).
NOTE: See 3.i.(35) for a definition of
coarse and fine resistor loop structures.
The element drawing must be referenced
to determine if a given resistor loop
structure is coarse or fine.
FIGURE 2032-28h. Class H resistor loop nicking and scorching criteria exceptions
.
MIL-STD-883F
METHOD 2032.2
18 June 2004
33
Class H Class K
3.1.7 d. (Continued.)
NOTE: This criterion does not apply to the last
rung of a resistor ladder if the last rung
is inactive (see figure 2032-29h).
FIGURE 2032-29h. Class H laser nicking criteria exception for the last rung of a resistor ladder
.
e. A kerf or scorch which extends into a e. Same as class H.
resistor ladder sidebar (see figure
2032-30h).
FIGURE 2032-30h. Class H resistor ladder sidebar trim criterion
.
MIL-STD-883F
METHOD 2032.2
18 June 2004
34
Class H Class K
3.1.7 f. Kerf or scorch misalignment (see figure 3.1.7 f. Same as class H.
2032-31h).
FIGURE 2032-31h. Class H laser trim misalignment criteria
.
g. A kerf which extends into metallization and g. Same as class H.
leaves less than 75 percent of the
metallization width undisturbed (see figure
2032-32h).
NOTE: Opening a metallization link by design
is acceptable.
FIGURE 2032-32h. Class H laser trim kerf extension into metallization criteria
.