[gta02-core] component research: incompatible replacements
Werner Almesberger
werner at openmoko.org
Sun Apr 4 09:42:07 CEST 2010
There are a few components for which I could only found replacements
that perform roughly the same function. In many cases, just the
package or the pin assignment is different. In some cases, there are
more differences.
Here is an overview:
Part File Status Incompatibility
(of original part; Foot Circuit
of substitute only | Mech| Functn
if indicated) | | Pins|
---------------------- -------------- ---------------------- +-+-+-+-+------
AAT1275IRN-5.0-T1 u4904 not found yet X - X X 1
BF2520-B2R4CAB/LF u8002 not found yet X - - - -
BTP-03JA4G con1701 no distributor X ? ? - -
FA2012-KR40PAA u6007 not found yet X - - - -
HT-210UD/NB led1501 long lead time X - X ? colors
IT3205BE x7601 not found, sub. expens X - - - -
R3113D241A-TR-F u7604 not found yet X - X - -
RT9013-12PB u1702 not found yet - - 2 - -
RT9711BPB u4905 not found yet - - X - 3
(other replacement) X - X 4 -
SN74AUP1G00DCKR u4902 borderline availabil. X - - - -
WTE06016 ant8001 not found X X ? - -
1) No fault indication
2) Pin NC in original has function
3) Lower maximum current
4) Additional bypass capacitors recommended
Regarding the R3113D241A, which resets the ATR635 of the GPS subsystem,
the question is whether we need a reset input at all, and if we do,
whether we couldn't just reset it from the CPU.
(See also bom/research/u7604)
I would also appreciate comments on the other more or less similar
substitutes I've come up with, namely for u4904, u1702, and u4905.
(Details in bom/research/)
If someone can find better replacements, that would be even nicer :)
- Werner
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