AMS Electronics Preferred Parts List
Doc: AmsE-PPL, version 01 Nov 01
Mike Capell/MIT
5, ICs (Integrated aka Monolithic
Circuits)
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12 Sep 01 |
Initial
release |
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01 Nov 01 |
Mods to most
sections. |
Further and perhaps more current document can be found starting from Base URL
http://ams.cern.ch/AMS/Electronics/Parts/
This (will, should) include current versions of:
PPL-doc, .doc
& .pdf this document in HTML, MSWord and PDF (nyet),
PPL-table, .xls & .pdf the parts list in HTML, Excel and PDF (nyet),
Crate(Box) & board tables, .xls Lists of crates(boxes) & boards in HTML, Excel.
NASA Parts Selection List (when available, the server is
flakey)
ESA Qualified Parts List (QPL)
This document aims to be a source of information for the selection and
procurement of electronic components and associated materials for the AMS 02
experiment flight electronics, particularly for those electronics that are to
be produced at CSIST, Taiwan. Each item
is assigned a unique part identifier (PID) according to a classification
scheme. This should make it easier to
design using parts already on the list, minimize the number of different parts
required and facilitate procurement.
Parts have been selected to be on
the list based on our own requirements, experience and tests, as well as the
information contained in the NASA Parts Selection List, which
is derived from the now defunct MIL-STD-975.
Also worth a look is the ESA Qualified Parts List (QPL). If there is a particular reason I’ve noted it parenthetically in
italics. “(procurement)” indicates the parts either cost more than they
are worth, take to long to get, are not usually stocked or produced, etc. Also note that documents that used to be
called MIL-C-nnnnn have all been renamed MIL-PRF-nnnnn.
Somehow, everything seems to have a unique part number. Often things will have several part numbers, one from the particular manufacturer and others that indicate it adheres, more or less, to some set of standards. The primary example of the later case is the “MIL-spec” part numbering scheme. In addition to the part itself, for procurement we often also need to specify the “packaging” (reel, tray, etc) in which the parts are delivered (don’t confuse this with the “package”, which indicates the size, shape and often the number of contacts of an individual part and is usually defined by the part number). For things that have a MIL-spec part number, that number should be used (if that is what we really want). Otherwise the manufacturer and the manufacturer’s part number should be specified. Anyway a clear, concise description should be provided, this should include the “package” (no good standard).
As part of the specification process, each item we need to use is assigned a unique PID. This assignment will probably be based on some scheme that only I understand – but once assigned it should be used. This does not mean that the part is accepted for flight or even that we are going to buy it. Each PID will be explicitly accepted for flight before procurement.
MIL-spec parts can usually be bought any old how, with the exception of connectors where we prefer to buy mating parts from the same manufacturer. That said, we don’t want to have to order the same part over and over, so we will try to order these in one shot. We do not impose lot level procurement on other parts. We’ll make a best effort to get all the parts of a specific kind (that is, for one PID) from the same vendor at the same time and hopefully that means they were all made in the same factory at the same time and will have near as possible the same performance. In addition, parts over three years old are not recommended.
Also: Part availability may lead to the substitution of parts with “better” specifications (for example tighter tolerance on a capacitor) but the same critical parameters (package, etc). If there are questions the designer will be asked to verify the new part number.
In decreasing levels of severity I’ve used the following hopefully self-explanatory terms:
Forbidden,
Required,
Exception,
Recommended,
Allowed
Preferred
Suggested
To select parts, start from the parts already on the PPL. If you can’t find what you need then we’ll have to get a new part on the PPL. Follow the above list in reverse order till you can make up the part number you need, then contact me and we’ll figure out what to do.
Items are classified according to Table 1. The PID indicated is the minimum PID for that Class and Type.
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Table 1: Parts Classification
and PIDs
Within each type there maybe several subtypes, or the parts in that category may just be given a sequential subtype. As useful, PIDs may have a fractional field to indicate some important property of the part – for example the capacitance of capacitors or the number of contacts in a connector.
Note that I’m using the terms SMD and PTB as opposed to the MIL spec lingo “Chip” and “Leaded”.
According to the part classification, I’ve listed what I understand about part preferences. All of this is discussable. If you need a particular part to meet your performance requirements and it just does not fit in then let’s discuss what to do about it.
In addition you will see that most of the subsequent sections are information free. Some of them (eg sec 5, ICs) don’t really need anything more saying here – just see the actual parts list for preferences. Others (secs 4, diodes, 7, transistors, 8, misc) I just have no idea (yet) what to say – help!
All that said, here are a few indications for all parts.
Forbidden: Nylon and other volatile plastics/polymers.
Forbidden: Cadmium (yellowish) finishes
Forbidden: Pure
Tin, Pure Lead, pure Zinc terminations (whiskers)
Required: Operation in AMS environment (vacuum, magnetic field of 100’s Gauss)
Required: Storage range of –50 C to +105 C
Required for passives: MilIndustrial
temp range (operational: -55 C to +125-40 C to +85
C)
Required for actives: At least Industrial temp range (operational: -40 C to +85 C)
Not Required: Radiation (total dose) hardened or rad. tolerant parts (<1Krad/year)
Required for actives: Assessment of SEE performance, preferably by measurement.
Not Required: Lot procurement
Recommended for
passives: Mil temp range (operational: -55 C to +125 C)
Recommended: SMD components (if they meet performance requirements)
Not Recommended: BGA packages (still difficult to
assemble) (BGA is OK)
Recommended for non MIL spec: Pseudo lot procurement (see section 0,1)
Recommended: Tape & Reel packaging
Preferred: J (not Gull wing) leaded SMD (inspection)
No Preference: Gold plated leads (no need to degold, use solder with Ag)
Not Preferred: Ceramic packaging (more trouble than benefit)
PID = 1,TNN.CCZ where T = types 0-4, NN=subtypes=style no (add n*10 for Tol<10%),
CCZ=mil cap code (2 digits pF, 1 digit following zeros,
for less than 10pF use “R” as decimal point, CCZ=5R6=5.6 pF)
Required: established reliability
Required: failure rates at least R, C
Recommended: Standard values (CC=10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82)
Preferred: failure rate S or D
Preferred: SMD (chip)
Not recommended: MIL-PRF-123 (procurement, > $3 each.)
Forbidden: MIL-PRF-55681/1, style CDR02=size 1805 (fragile)
Forbidden: Terminations W,Y,=“SolderGuard II” (tin whiskers)
Not recommended: MIL-PRF-123 (procurement)
Recommended: MIL PRF-55681 (AMS 01)
Not Preferred: MIL-PRF-55681/1, styles CDR01-CDR06=sizes 0805-2225 (procurement)
Not Preferred: MIL-PRF-55681/7, style CDR31=size 0805m (inspection) (CDR31 is OK)
Preferred: MIL-PRF-55681/8-11,
styles CDR32-CDR35=sizes 1206m-1825mMIL-PRF-55681/7-11,
styles CDR31-CDR35=sizes 0805m-1825m (procurem.)
Note: Metric sizes means that the dimensions are specified in mm, however these are the
sizes you have been using so you can just ignore the trailing “m”
(the numbers quoted are nominal L x W in mils).
Preferred
(C<10pF): Tolerance C= ±0.25pF
Preferred (C≥10pF): Tolerance K=10%
Table 2:
Preferred Ceramic SMD Capacitors
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PID(10%) |
Min £ pF
£
Max |
Style, Dielec |
Size |
Voltage |
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1,131 |
1 |
470 |
CDR31BP |
0805m |
100 V |
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CDR31BX, PID 1,141 suggested |
1,132 |
510 |
1,000 |
CDR32BP |
1206m |
100 V |
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1,100 |
2,200 |
50 V |
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1,133. |
2,400 |
3,300 |
CDR33BP |
1210m |
50 V |
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1,134. |
3,600 |
4,300 |
CDR34BP |
1812m |
100 V |
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1,141 |
560 |
4,700 |
CDR31BX |
0805m |
100 V |
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1,141 |
5,600 |
18,000 |
CDR31BX |
0805m |
50 V |
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1,142. |
22,000 |
39,000 |
CDR32BX |
1206m |
50 V |
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1,143. |
47,000 |
100,000 |
CDR33BX |
1210m |
50 V |
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1,144. |
120,000 |
180,000 |
CDR34BX |
1218m |
50 V |
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1,145. |
220,000 |
470,000 |
CDR35BX |
1825m |
50 V |
Example: Standard 0.1uF decoupling capacitor is CDR33BX104AKUS, PID=1,143.104.
Size is 1210m, x7r dielectric, 10 0000 pF, 50V, 10%
tolerance, “SolderGuard I”, 0.001 % failure rate/1000 hours.hours (See note above)
Vendors: Direct?, Avnet-Marshall, Jaco, Reptron (Vishay)
Note: Vishay has wrong CDR part numbers (Tol and Term interchanged).
Note: 7” reel, standard, has 2,500 (1,100) pieces for sizes 0805-1808 (1812-2225)
Required: Standard values
Recommended: MIL-PRF-55365/4, style CWR06 and /8=CWR11
Not Recommended: MIL-PRF-55365/4, style CWR09 (performance, procurement)
Preferred: MIL-PRF-55365/8=style CWR11=metric sizes
Preferred: Termination H=Solder Plate, Tolerance K=10%, Failure rate S or C
Preferred:Suggested:
Values vs Size & Voltage see table 3.
Note: Use table
3 values only if they meet your requirements (ESR!).
Table 3: PreferredSuggested
Tantalum SMD Capacitors (CWR11)
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PID(10%) |
uF |
Case= Size |
Voltage |
ESR |
MIL Part No. |
Kemet or Sprague ? |
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1,311.684 |
0.68 |
A= 3216m |
J= 20 V |
12.0 W |
CWR11JH684KC |
either |
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1,311.105 |
1.0 |
J= 20 V |
10.0 W |
CWR11JH105KC |
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1,311.155 |
1.5 |
H= 15 V |
8.0 W |
CWR11HH155KC |
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1,311.225 |
2.2 |
F= 10 V |
8.0 W |
CWR11FH225KC |
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1,311.335 |
3.3 |
B= 3528m |
J= 20 V |
4.0 W |
CWR11JH335KC |
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1,311.475 |
4.7 |
H= 15 V |
4.0 W |
CWR11HH475KC |
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1,311.685 |
6.8 |
F= 10 V |
3.5 W |
CWR11FH685KC |
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1,311.106 |
10.0 |
C= 6032m |
H= 15 V |
2.5 W |
CWR11HH106KC |
kemet |
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1,311.156 |
15.0 |
F= 10 V |
2.5 W |
CWR11FH156KC |
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1,311.226 |
22.0 |
D= 7343m |
J= 20 V |
0.9 W |
CWR11JH226KC |
sprague |
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1.311.336 |
33.0 |
H= 15 V |
0.9 W |
CWR11HH336KC |
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1.311.476 |
47.0 |
F= 10 V |
0.9 W |
CWR11FH476KC |
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Manufacturers: Vishay Sprague, Kemet
Vendors: Direct?, Reptron
PID = 2,TNN.CCC where T = types 0-7, NN=subtypes, CCC=number of contacts.
Forbidden: Cadmium finish
Required: Keyed insertion
Not Required: Positive mating inspection indicator
Not Recommended: Right angle connectors PCB to cables, PTB or SMD (vibration)
Exceptions: microminiature strip for tracker (SSMB for coax ?)
Recommended: Flying wire connectors front mounted on panels
Allowed: Flying connectors on pigtails, especially for HV
Recommended: Different connectors for different applications (destructive cross plugging)
Recommended: Both sides of a connector, even if “standard”, from same manufacturer.
Not Preferred: Threaded circular connectors
Preferred: Bayonet or snapfit for circular connectors
Manufacturers: Harting (preferred), Erni, Tyco, Molex, …
Vendors: Direct (Harting Swiss Rep)
Recommended: Harting 0903 196 4825 and 0903 296 4921
Mounting hardware: TBS
Recommended: Harting series 17xx xxx 2xxx
Preferred: Use “monoblock” A+B connector when possible (J1+J2, J4+J5)
Note: Pressfit mounting tooling included here
Note: ERNI
connectors under investigation.
Recommended: Harting series TBD
Recommended: SSMB (50 Ohm)
Manufacturers: AEP
Vendors: Direct
Recommended: Reynolds TBSIndustries
series 600
Recommended: MIL-DTL-38999, series II
Note: scoopable, be careful.
Preferred: AWG 22D and AWG 12 contacts (TBC)
Note: Crimp tooling included here.
Manufacturers: ITT Cannon
Vendors: Was Time Electronics– now Newark or AvnetM Marshall ?
Recommended: TRB (75Ohm), for example BJ77
Note: The center conductor is “+” and attaches to the blue wire, the intermediate conductor
is “-“ and attaches to the white wire, the outer conductor attaches to gnd.
Manufacturers: MilesTek, Trompeter
Vendors: Direct
Required: Jackposts/Jackscrews
Exception: tracker 1 row strip
Recommended: as MIL-PRF-83513 for space use, 2-row, metal shell with electroless Ni
plating, MIL-W-22759/33-26 type wire (19 strand Ag plated Cu, TFE)
Allowed: 1-row, no metal shell and SMD for tracker strip
Recommended: Front panel mounting (else jackposts/jackscrews hard to specify)
Preferred: Color coded wire, either striped (MIL-STD-681) or 10 color repeat (fabrication)
Preferred: Rather than standard 18” wire lengths that require restripping, order 1.5” ???
Note: 9 contact connectors are used for one AMSWire link (board side: /04=socket) and
for one dual CAN bus connection (board side: /03=pin).
Use a different size for other applications to avoid cross plugging.
Manufacturers: Airborn (preferred), GlenAir (preferred), ITT
Cannon, Cinch, Ultimate (Molex).
Vendors: Direct for Airborn, GlenAir & Ultimate (Molex), Farnell=Newark et al for ITT
& Cinch.
Manufacturers: Statek (preferred), Epson
Vendors: Statek Direct, Epson Reptron
Preferred:
Statek CX4
Preferred:
Statek CX03
You better just
see the table and see what is on it.
TDCs, ADCs, DACs, etc.
Recommended: Actel A54SXggA-3ppnnnI, gg=08,16,32,72, ppnnn=PQ208
Preferred: gg=32 or 72 (smaller sizes not beam tested by us).
Line drivers, receivers, etc
Simple logics
Microprocessors, microcontrollers, DSPs
Voltage, current, etc
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Table 4: Pseudo E series values |
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Pseudo E24 |
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Pseudo E12 |
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10.0 |
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11.0 |
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12.1 |
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13.0 |
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15.0 |
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16.2 |
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18.2 |
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20.0 |
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22.1 |
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24.3 |
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27.4 |
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30.1 |
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33.2 |
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36.5 |
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39.2 |
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43.2 |
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47.5 |
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51.1 |
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56.2 |
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61.9 |
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68.1 |
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75.0 |
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82.5 |
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90.9 |
PID = 6,TNN.RRRR where T = types 0-4, NN=subtypes, RRRR=Resistance and Tolerance code.
Required: established reliability
Required: failure rate R or better
Required: Tolerance matches Standard Decade values
(note – this is
required by the MIL SPEC).
Recommended: Film SMD
Recommended: Tolerance 1%.
Recommended: Pseudo E24 values in table 4
Preferred: Thick film SMD (unless you need 0.1%)
Preferred: Pseudo E12 values in table 4
NOTE: Closest Pseudo value will be substituted by default.
Recommended: MIL-PRF-55342=Type RM
Exception: 0 Ohm jumper resistor, use PID 6107.0000=
VISHAY DALE CRCW12060000Z
(and similar
for other R<10 Ohm)
Not Recommended: MIL-PRF-55342/02=Style RM0505 &
/06=StyleRM0705 (inspectibility)
Recommended: Termination B=Pretinned Ni barrier wraparaound
Preferred: Thick, not Thin, Film.
Preferred: 100mW: MIL-PRF-55342/03=Style RM1005
Preferred: 250mW: MIL-PRF-55342/07=Style RM1206
(iff Thick (1%))
Preferred: 0.1%: MIL-PRF-55342/07=Style RM1206 Thin, 125mW
Suggested:
RM1206, 1%, with Pseudo E12 values
Note: 7” reel contains 5000 pieces
Manufacturers: Vishay Dale (preferred), State of the Art
Vendors: Dale was direct, now Avnet Marshall or ???, SotA Jaco
Resistors, HV
You better just
see the table.
Including CardLocs, mounting hardware, front panels, etc.
Including VibraTite, ChoTherm white thermal filler gunk, MasterBond electrical/thermal conductive glue.
As much as possible this should be included next to the requiring part…