NASA Parts Selection List (NPSL)
 
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MIL-PRF-19500 Part Number Explanation

Example: JAN#@2N2369AR where,
 

JAN Joint Army and Navy (JAN) Military Part Designator
# Quality Level (JAN, JANTX, JANTXV, JANS and JANFS)
@ Indicates Radiation Hardness Assurance (RHA) Level
2N Component designator for Transistors
2369 Identification Number
AR Suffix Letters
 
Quality Level, (#)
S
Highest Quality level 1
TXV
Level 2, 3
 
Radiation Hardness Assurance Level, (@)
RHA Designator
Total Ionizing Dose
(RAD (Si))
Neutron Fluence
(N/cm2)
M
3 x 103
2 x 1012
D
1 x 104
2 x 1012
L
5 x 104
2 x 1012
R
1 x 105
2 x 1012
F
3 x 105
2 x 1012
G
6 x 105
2 x 1012
H
1 x 106
2 x 1012

NOTE: Unless specifically stated within the parts selection tables of the NPSL, listing of a device technology herein does NOT imply/guarantee Radiation Hardness Assurance (RHA). Applications concerned with a device's ability to tolerate exposure to various forms of space radiation (e.g., total ionizing dose, single event effects, etc.) should be reviewed and have the device assessed by the Program's radiation assurance experts. The following resources may also be consulted for initial guidance:

NASA Goddard Radiation Effects and Analysis
Jet Propulsion Laboratory Radiation Effects

 Suffix letters

A, B, C, etc
Indicates a modified version that is substitutable for the basic part number (non-suffix) device
M
Indicates matching of specified parameters of separate devices
R
Indicates reverse polarity packaging of the basic part number device
L or S
Indicates that the terminal leads are longer or shorter, respectively than those of the basic part number device
U
Indicates leaded or surface mounted devices
UR
Indicates leaded or surface mounted (round end cap diodes)
US
Indicates leaded or surface mounted (square end cap diodes)
-1
Indicates metallurgical bond
 
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