Source: MiniDisc Wiki contributors · September 3, 2026 snapshot · CC BY 4.0, except where otherwise credited.
Attribution and changes
Adapted from “Sharp MD-ST531 / MD-ST631”. Links, layout and file names normalized; missing database fields restored; remote embeds replaced with links. Manufacturer manuals and separately credited photographs retain their original attribution.
| Name | MD-ST531 / MD-ST631 |
|---|---|
| Manufacturer | Sharp |
| Released | 1999/09 |
| Device type | portable |
| Recorder | Player |
| MDLP | No |
| NetMD | No |
| Hi-MD | No |
| Radio | No |
| Dimensions | 71.7 x 14.2 x 79.5mm |
| Weight | 85g (w/batt), 115g (w/ batt) |
| ATRAC ver | Not recorded |
| Battery | Not recorded AD-T51BT |
| Battery notes | Not recorded |
| Sidecar (depr) | 1xAA |
| Voltage | 3.6, 5 |
| Power cable | Not recorded |
| Price (launch) | Not recorded |
| ¥35 000 | |
| - | |
| Inputs | N/A |
| Outputs | 3.5mm headphone |
| Control | Not recorded |
See also: Pioneer PMD-MK1, Pioneer PMD-P7
Offered in MD-ST531-S (Aqua Silver), MD-ST531-A (Resort Blue), MD-ST531-P (Floral Pink). The MD-ST631 was only offered in -S (Shining Silver).
16-megabit DRAM offering 40 second anti-skip protection.
Docking station for recharging unit's battery which advertises a 27 hour runtime.
MD-ST631 comes with Kanji capable remote for JPY 38,000. The remote model# was AD-S53RM which had an MSRP of 7,500 yen. The standard remote with clock functionality was model# AD-S31RM - MSRP 7,500 yen.
Practical maximum output: 5mW + 5mW (32Ω)
Uses Sharp's 3rd generation LSI (hardware not atrac encoder) with a 0.25 μm process.
Content adapted from: Sharp Press Release Sharp Press Release (MiniDisc Wiki mirror) MD-ST531 MD543 page, MD-ST631 MD543 page, MiniDisc.org page
Manuals
Repair
Photos
source .tiff files: mdst531a.zip — unavailable in this snapshot
Have photos or data to add? Edit the page! We do not accept contributions via email.
Additional specifications and references
| Web Md | No (not NetMD) |
|---|---|
| Region | Japan |