AST-3G Plus II: Difference between revisions

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|8
|8
|KM41C464P-10
|KM41C464P-10
|
|Samsung(?)
|Dynamic RAM
|Dynamic RAM
|Can't Find
|[https://www.datasheets360.com/pdf/6925214166889040741 Memory Guide]
|-
|-
|U9
|U9
Line 114: Line 114:
|CHIPS
|CHIPS
|Enhanced Graphics Controller
|Enhanced Graphics Controller
|[https://ipfs.io/ipfs/QmSJXJ98kuJxxLgbZ7XHT6PUNkw8JXxNa9htjnKQfkQS32?filename=P82C435.pdf Link] [https://drive.google.com/file/d/1FumDfJ-o8B5xhxKiCJumEqg6GaG3uDhq/view?usp=drive_link Other Link (click link, then click the download icon)]
|[https://drive.google.com/file/d/1FumDfJ-o8B5xhxKiCJumEqg6GaG3uDhq/view?usp=drive_link Link(click link, then click the download icon)]
|-
|-
|U11, U12, U13
|U11, U12, U13
|3
|3
|DM74LS244N
|DM74LS244N
|
|National Semiconductor
|Octal 3-State Buffer/Line Driver/Line Reciever
|Octal 3-State Buffer/Line Driver/Line Reciever
|[https://media.digikey.com/pdf/Data%20Sheets/Fairchild%20PDFs/DM74LS244.pdf DM74LS244]
|[https://media.digikey.com/pdf/Data%20Sheets/Fairchild%20PDFs/DM74LS244.pdf DM74LS244]
|-
|U14
|1
|LM339N
|National Semiconductor
|Quad Differential Comparator
|[https://www.ti.com/lit/ds/symlink/lm339.pdf LM339]
|-
|-
|U16
|U16
|1
|1
|74LS153N
|74LS153N
|
|Signetics
|Dual 4-Line to 1-Line Data Selectors/Multiplexers
|Dual 4-Line to 1-Line Data Selectors/Multiplexers
|[https://www.ti.com/lit/ds/symlink/sn74ls153.pdf SN74LS153]
|[https://www.ti.com/lit/ds/symlink/sn74ls153.pdf SN74LS153]
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|U18
|U18
|1
|1
|SN74LS4AN
|SN74LS74AN
|Motorola
|Motorola
|
|
|[https://www.ti.com/lit/ds/symlink/sn74ls74a.pdf SN74LS4A]
|[https://www.ti.com/lit/ds/symlink/sn74ls74a.pdf SN74LS74A]
|}
|}
==Replacement Parts==
==Replacement Parts==
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|SN74LS244N
|SN74LS244N
|[https://www.digikey.com/en/products/detail/texas-instruments/SN74LS244N/277299?0=%2Fbuffers-drivers-receivers-transceivers&s=N4IgjCBcoGwJxVAYygMwIYBsDOBTANCAPZQDaIALGGABxwDsIAuoQA4AuUIAyuwE4BLAHYBzEAF9CAWgBMiECkj8ArgWJkQAVmbjJIOZHL0KAGW4yKFHUA DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS244N?qs=5WY7Uqh921ypecHduhX%252BiA%3D%3D Mouser] [https://www.lcsc.com/product-detail/Buffer-Driver-Transceiver_Texas-Instruments-SN74LS244N_C352965.html LCSC]
|[https://www.digikey.com/en/products/detail/texas-instruments/SN74LS244N/277299?0=%2Fbuffers-drivers-receivers-transceivers&s=N4IgjCBcoGwJxVAYygMwIYBsDOBTANCAPZQDaIALGGABxwDsIAuoQA4AuUIAyuwE4BLAHYBzEAF9CAWgBMiECkj8ArgWJkQAVmbjJIOZHL0KAGW4yKFHUA DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS244N?qs=5WY7Uqh921ypecHduhX%252BiA%3D%3D Mouser] [https://www.lcsc.com/product-detail/Buffer-Driver-Transceiver_Texas-Instruments-SN74LS244N_C352965.html LCSC]
|-
|U14
|1
|LM339N
|[https://www.digikey.com/en/products/detail/texas-instruments/LM339N/277628 DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/LM339N?qs=rshUhwi3fbY%252BaR%252BOl3edNw%3D%3D Mouser] [https://www.lcsc.com/product-detail/Comparators_HGSEMI-LM339N_C725324.html?s_z=n_LM339N LCSC]
|-
|-
|U16
|U16
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|SN74LS151N
|SN74LS151N
|[https://www.digikey.com/en/products/detail/texas-instruments/SN74LS151N/277290 DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS151N?qs=JS6RUWRH9DXfGLJjMdxNOQ%3D%3D Mouser] [https://www.lcsc.com/product-detail/Signal-Switches-Encoders-Decoders-Multiplexers_Texas-Instruments-SN74LS151N_C1547276.html LCSC]
|[https://www.digikey.com/en/products/detail/texas-instruments/SN74LS151N/277290 DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS151N?qs=JS6RUWRH9DXfGLJjMdxNOQ%3D%3D Mouser] [https://www.lcsc.com/product-detail/Signal-Switches-Encoders-Decoders-Multiplexers_Texas-Instruments-SN74LS151N_C1547276.html LCSC]
|-
|U18
|1
|SN74LS74AN
|[https://www.digikey.com/en/products/detail/texas-instruments/SN74LS74AN/277314 DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS74AN?qs=b0gIXGU74fP41yYZQO4%252BKQ%3D%3D Mouser] [https://www.lcsc.com/product-detail/Flip-Flops_Texas-Instruments-SN74LS74AN_C1523173.html?s_z=n_SN74LS74AN LCSC]
|}
|}
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''

Latest revision as of 13:54, 1 March 2025

For more information, see this article's corresponding Wikipedia page: Device.
This device is in the WorkNeeded:OriginalParts category because it was flagged as missing information on the original parts. It may have replacement parts listed but those cannot be assumed to be identical to the originals. If you have a list of the original parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables
This device is in the WorkNeeded:General category because it was flagged as missing general information about the device. The information may be incomplete, using default text, or inaccurate and should be verified with external sources if possible. If you can add or correct information on this page, please feel free to edit it and do so.
AST-3G Plus II
Preliminary Information
Release Year 1987
Leak Risk Medium
Batteries None
Mounting Technology Through Hole
Capacitor Types Aluminum Electrolytic, MLCC
Destructive Entry No

Jumper settings and other info here

Known Issues

Three electrolytic capacitors are leaking, try to replace

Causes

  • Produced in 1987, electrolytic capacitors are prone to leakage

Solutions

  • Recapping

Disassembly Notes

The leaked electrolyte corrodes and causes solder oxidation, which makes it difficult to desolder. Be careful to avoid high temperature damage to the pad

Original Parts

AST-3G Plus II (C)AST 1987, FCC ID: DJK 68Y AST3G

PCB Mark: 202161-303A Silkscreen: 202161-003

Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Height Lead Spacing Temp Type Brand Series
Others 23 100 pF Through Hole 2.0 mm MLCC 104
C35 1 2.2 pF Through Hole 2.0 mm MLCC 222
C26, C27, C28, C29, C30, C31, C32, C33 8 47 nF Through Hole 2.0 mm MLCC 47K
C1, C2, C3 3 22 µF 16 V Through Hole 5 mm 5 mm 2.0 mm 85 °C Aluminum electrolytic ELNA 018 H
Integrated Circuits
RefDes Qty Model Number/Part Number Manufacturer (If Applicable) Explanation Datasheet
U1, U2, U3, U4, U5, U6, U7, U8 8 KM41C464P-10 Samsung(?) Dynamic RAM Memory Guide
U9 1 P82C435 CHIPS Enhanced Graphics Controller Link(click link, then click the download icon)
U11, U12, U13 3 DM74LS244N National Semiconductor Octal 3-State Buffer/Line Driver/Line Reciever DM74LS244
U14 1 LM339N National Semiconductor Quad Differential Comparator LM339
U16 1 74LS153N Signetics Dual 4-Line to 1-Line Data Selectors/Multiplexers SN74LS153
U17 1 74LS151N DM74LS151
U18 1 SN74LS74AN Motorola SN74LS74A

Replacement Parts

0805 SMD 22uF 16V - 50V 10%

The lead spacing is too limited, I'd like use SMD on back of PCB where the through holes are filled with solder.

Capacitors
RefDes Qty Compatible Part Number Order Links
Digikey

Through Hole Capacitors

Capacitors
RefDes Qty Compatible Part Number Order Links
C1, C2, C3 3 ECE-A1CKS220 / 25MH522MEFCT56.3X5 DigiKey Mouser LCSC
C26, C27, C28, C29, C30, C31, C32, C33 8 K473K15X7RF53L2 / CD1H473KC9BER1E100 DigiKey Mouser LCSC
C35 1 FG28C0G1H2R2CNT06 / 561R10TCCV22 DigiKey Mouser LCSC
Others 23 K101J10C0GF5UH5 / CC1H101KC1EDSL4B1100 DigiKey Mouser LCSC
Integrated Circuits
RefDes Qty Compatible Part Number Order Links
U11, U12, U13 3 SN74LS244N DigiKey Mouser LCSC
U14 1 LM339N DigiKey Mouser LCSC
U16 1 SN74LS153N DigiKey Mouser LCSC
U17 1 SN74LS151N DigiKey Mouser LCSC
U18 1 SN74LS74AN DigiKey Mouser LCSC

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Kits

Related Links

References

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