MIL- STD-883F 2004 TEST METHOD STANDARD MICROCIRCUITS.pdf - 第440页

MIL-STD-883F METHOD 2032.2 18 June 2004 34 C lass H Cla ss K 3.1. 7 f . Kerf or s corc h misal ignment ( see fi gure 3. 1.7 f . Same as cl ass H. 2032-31h). FIGURE 2032-31h. Cl ass H l aser t rim mi salignment cri teria …

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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
.
MIL-STD-883F
METHOD 2032.2
18 June 2004
35
Class H Class K
3.1.7 h. A kerf in a resistor, at the interface 3.1.7 h. Same as class H.
of the resistor material with the
metallization, that leaves less than 50 percent
of the original resistor width, unless by
design.
PRECAUTIONARY NOTE: The maximum
allowable current density requirement shall
not be exceeded. (see figure 2032-33h).
FIGURE 2032-33h. Class H resistor width reduction at metallization interface criteria
.
i. A kerf in a resistor that leaves less i. Same as class H.
than 50 percent of the original resistor width,
unless by design.
PRECAUTIONARY NOTE: The maximum allowable
current density requirement shall not be exceeded
(see figure 2032-34h).
FIGURE 2032-34h. Class H resistor width reduction by trimming criteria
.