MIL-PRF-19500P
3.10.2 Marking on initial container (unit package). All device marking including an ESD label, except for polarity
and serial numbers, shall also appear on the unit package used as the initial protection for delivery. See appendix G,
section G.6.2 for marking requirements of die unit packaging.
3.10.3 Special marking. If any special marking is used, it shall in no way interfere with, or obscure, the marking
required in 3.10.1.
3.10.3.1 ESDS identifier. ESDS testing shall be done in accordance with test method 1020 of MIL-STD-750. The
testing procedure of JESD22-A114 may be used in lieu of method 1020 provided the manufacturer is able to
demonstrate correlation between the two methods. Unless otherwise specified, tests shall be performed for initial
qualification and product redesign. When a device's ESDS class is determined by the ESDS classification test (see
E.4.2.1), the devices represented by the test may, at the option of the manufacturer, be marked as follows:
Ć0 - single equilateral triangle (outline or solid) +0 (still acceptable as
Class 0
Less than 250 V
pin one designator).
ĆA - single equilateral triangle (outline or solid) +A (still acceptable as
Class 1A
250 V to 499 V
pin one designator).
ĆB - single equilateral triangle (outline or solid) +B (still acceptable as
Class 1B
500 V to 999 V
pin one designator).
ĆC - single equilateral triangle (outline or solid) +C (still acceptable as
Class 1C
1,000 V to 1,999 V
pin one designator).
ĆĆ - double equilateral triangle (outline or solid) (still acceptable as pin
Class 2
2,000 V to 3,999 V
one designator).
ĆĆĆA - triple equilateral triangle (outline or solid) +A (still acceptable as
Class 3A
4,000 V - 7,999 V
pin one designator).
ĆĆĆB - triple equilateral triangle (outline or solid) +B (still acceptable as
Class 3B
8,000 V - 15,999V
pin one designator).
Non-sensitive
Above 15,999 V
No designator.
3.10.3.2 Beryllium oxide package identifier. If a semiconductor package contains beryllium oxide (beryllia), the
device shall be marked with the designation 'BeO'.
3.10.4 Marking legibility. Marking shall remain legible. Marking damage caused by mechanical handling shall not
be cause for lot rejection. Devices having damaged markings shall be remarked prior to shipment to insure legibility.
3.10.5 Polarity marking of unidirectional diodes and thyristors. The polarity shall be indicated by one of the
following methods.
3.10.5.1 Diodes.
a.
A diode graphic symbol or arrow with the arrow pointing toward the cathode terminal for forward bias.
b.
A single contrasting color band or a minimum of three contrasting color dots spaced around the periphery on
the cathode end may be used.
c.
An ESD identifier may be used to indicate polarity for sensitive devices.
NOTE: U, US, or UR diodes shall have a cathode band or three dots indicating cathode end.
3.10.5.2 Thyristors. A graphic symbol for a thyristor with the arrow pointing toward the cathode terminal (for
stud-mounted thyristors only).
3.10.6 PIN. Each semiconductor device shall be marked with the type designation which shall be formulated as
shown in 1.3. If the device size does not allow the complete PIN to be marked on the device, the component
designation portion (see 1.3.5) shall be omitted first, followed by the quality level. RHA designators will be included to
the abbreviated PIN as appropriate.
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