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# IBM 041841QLAD-7: Choosing Among the QLAD Family of HSTL SRAMs The IBM 041841QLAD-7 completes the QLAD series that ChipApex lists: a 4 Mbit HSTL SRAM, 256K × 18, 3.3 V, in a 119-ball BGA measuring 17 × 7 mm. The family shares the package and pinout, and the -4 to -7 suffixes distinguish grade or speed options. For a buyer, having several suffixes in stock is useful, but it also creates a risk of mix-ups. A clear rule helps: replace like with like unless the equipment maker documents an approved substitution. The -6 part is a commonly cited alternative for the -7, but confirm this for your system before mixing. From a design point of view, HSTL SRAM is sensitive to reference-voltage noise and to reflections on unterminated stubs. Boards that worked for years can develop problems after rework if decoupling capacitors near the memory are damaged, so inspect the surrounding passives too. Typical uses today are depot repair of server and storage controllers, industrial control systems based on older compute boards, and laboratory equipment with long service lives. Ask for authenticity documentation and condition details (new, unused surplus or pulled) so you can match the part to your reliability requirements. Full specifications, pricing and stock for the [IBM 041841QLAD-7 4 Mbit SRAM](https://chipapex.com/product/041841qlad-7/) are on ChipApex, an independent electronic components distributor based in Shenzhen. Catalog home: [ChipApex](https://chipapex.com/). ## Further reading Other ChipApex component notes: - [Related ChipApex component note](https://pad.nixnet.services/s/WXVgt4Nx6Q) - [Related ChipApex component note](https://md.chaosdorf.de/s/8MQQYH-x6K) - [Related ChipApex component note](https://md.cccgoe.de/s/MSmzTpQYSreKYjADlvkNLA) - [Related ChipApex component note](https://pad.c3voc.de/s/tJjZIwIoRTqmZ0rxTknkWQ) - [Related ChipApex component note](https://md.chaos.jetzt/s/1tf86oXPRJ-piElJQsx4gQ) - [Related ChipApex component note](https://notes.thecloud2.be/s/zd8_ugd2Tsq05mW_ubCGIg) - [Related ChipApex component note](https://ventiere.com/supplier/chipapex-1792389469075) - [Related ChipApex component note](https://chipapex-distributor.surge.sh/) - [Related ChipApex component note](https://pad.medialepfade.net/s/KXQQjgSnW) - [Related ChipApex component note](https://telegra.ph/TI-LM2907N-8NOPB-Through-Hole-8-PDIP-Frequency-to-Voltage-Converter-10-22)