6 views
# IBM 041841QLAD-5: Notes on the -5 Bin of IBM's 4 Mbit HSTL SRAM The IBM 041841QLAD-5 is a 4 Mbit SRAM with a 256K × 18 organization, an HSTL interface and a 3.3 V supply, packaged in a 119-ball BBGA with a 17 × 7 mm body. It belongs to IBM's legacy server memory portfolio and is often mentioned with older IBM x3550-series machines. SRAM like this served as an external cache or high-speed buffer, where deterministic access time mattered more than density. The ×18 organization provides parity bits, which allowed the system to detect single-bit errors in cache lines. When you plan a replacement, start with the original speed bin. The -5 part may be required where timing margins are tight, and a slower bin should not be used even if it looks identical. The board's HSTL reference voltage and termination network remain the same, so in-system behavior depends mostly on the correct bin and good soldering. Rework best practice is the same as for other BGAs: preheat the board, use a profiled hot-air or IR station, clean the pads, and inspect with X-ray if possible. Replace any damaged pads before fitting the new part. Because the generic code IBM041841 covers several variants, always quote the full part number with its suffix when requesting quotes, so the supplier ships the exact bin. Full specifications, pricing and stock for the [IBM 041841QLAD-5 4 Mbit HSTL SRAM](https://chipapex.com/product/041841qlad-5/) 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://cpx9-lm324dr-2.surge.sh/) - [Related ChipApex component note](https://cpx9-e-stlc7550tqf7.surge.sh/) - [Related ChipApex component note](https://pad.medialepfade.net/s/z2AopgGFw) - [Related ChipApex component note](https://pad.stuve.de/s/iO-oJnwHnf) - [Related ChipApex component note](https://md.coredump.ch/s/qZjk_jB6IZ) - [Related ChipApex component note](https://hedgedoc.dezentrale.space/s/mKL6f0pn1p) - [Related ChipApex component note](https://chipapexsz.wordpress.com/2026/10/22/microsemi-0910-60m-65-v-npn-rf-transistor-in-a-55aw-package/) - [Related ChipApex component note](https://chipapex.hashnode.dev/a-60-v-sot-23-n-channel-as-a-low-side-switch-notes-on-the-06n06l) - [Related ChipApex component note](https://rentry.co/chipapex-a2t27s007nt1) - [Related ChipApex component note](https://text.is/chipapex-ph9400-111anlt)