Filed under schematics, this 65.3 KB PDF is named only for the 2N5191 part number, so it is almost certainly a component datasheet rather than a board drawing.

A 300 KB PDF datasheet for the 2N3663, a 2N-series registered transistor, listed as a schematic in this index.

A 164 KB PDF catalogued as a schematic and titled 28C64B, the B revision of the 28C64 64 Kbit parallel EEPROM code. The name names no vendor or package.

PDF of 129 KB titled 27C16, filed as a schematic but corresponding to an early member of the 27C EPROM family by its part number.

Named 20ETF-FP, this 198 KB PDF sits in the schematic category but states no laptop brand, board number or revision.

Code 20CJQ100 names this 201 KB PDF, which is catalogued as a schematic but identifies no brand, model, board number or revision.

Schematic in PDF, inside a RAR archive, for the MSI desktop motherboard MS-7681 at version 2.01.

Schematic in PDF form, packed in a RAR archive, covering the MSI GE62-2QF and GE72-2QC gaming laptops on MS-16J21 / MS-16J2 mainboards, with the 1792 number also listed…

Schematic set for the Lenovo ThinkPad X1 Carbon, packed in a RAR archive of about 1 MB.

Covering the 2SK2991, this 420 KB PDF is named only by part number, which points to an N-channel field-effect transistor in the Japanese JIS numbering system.

PDF document of 94.9 KB for the 2SC5299, a JIS-registered NPN transistor designation. Although catalogued as a schematic, files named after a part number like this are…

Datasheet in PDF form, 474 KB, for the 2SC5086 NPN bipolar transistor, indexed in the schematic category. The name lists no manufacturer, package or revision.

Under the name 2SC5064, this 468 KB PDF is filed as a schematic, yet the identifier is a Japanese-standard NPN transistor number, so a datasheet is what to expect…

Component PDF for the 2N6847, 130 KB, indexed under schematics. The name holds only the JEDEC number, without a manufacturer, suffix or revision, so identify the source…

A 394 KB PDF for the 2N6836, with RE appended to the name, which may mark a revised edition but cannot be confirmed from the name alone.

Tone control circuit intended for a 2.1 channel audio system, in a 159 KB PDF. It shows the bass and treble adjustment network that sits between the source or preamp and…

Schematic of a 2.1 channel amplifier based on the TDA2030A, from Technical Mriganka, in a 416 KB PDF.

Datasheet-sized PDF of 38.0 KB for the 2SC5474, with an _E suffix in the name that likely marks an English edition; that reading is an inference.

A compact 21.2 KB PDF titled after the 2SC4080, stored as a schematic but best treated as a transistor datasheet. JIS numbering uses 2SC for NPN bipolar transistors.

PDF listed as a schematic for the 28F020, with Intel named as the manufacturer in the file name. The 28F020 is a 2 Mbit parallel flash memory part.

A 447 KB PDF datasheet for the 24AA256, 24LC256 and 24FC256 I2C serial EEPROMs, each storing 256 Kbit.

A 77.2 KB PDF named 23c040h, a variant of the 23C040 part with an added H suffix whose meaning is not stated in the name and must be read from the document.

Schematic for the MSI MS-7392 motherboard, version 2.2, as a PDF packed in RAR. Technicians read it to trace each power rail from its regulator, verify the power-on…

Component reference for the 2SD2635, a 35.2 KB PDF listed among schematics. The file name offers only the part number, with no manufacturer or revision given.

The 2SD2598 transistor is covered in this 59.3 KB PDF, whose name ends in an _E suffix.

Datasheet-style PDF for the 2SD1423, 41.0 KB, stored as a schematic; the trailing _E in the name is not explained by the file itself.

Datasheet-type PDF for the 2SD1878, 90.6 KB, placed in the schematic category of the index. The name contains nothing beyond the part number.

Datasheet-style PDF for the 2SD1994A transistor, filed in the schematic category of the index.

Datasheet PDF, 292 KB, for the 2SK1829 transistor. Under JIS naming, 2SK marks an N-channel FET; the file name gives only the part number, with no maker or package…

Catalogued among schematics, the 43.5 KB PDF called 2SJ499's neighbour 2SJ485 refers to a semiconductor part; under the JIS scheme the 2SJ prefix designates a P-channel…

Here is a 42.3 KB PDF for the 2SC5264LS, indexed as a schematic. JIS numbering makes the 2SC prefix an NPN bipolar transistor, and the LS letters identify a variant of…

Base-version document for the 2SC4738, a 236 KB PDF placed in the schematic category. Following the JIS scheme, the 2SC prefix denotes an NPN bipolar transistor; F and…

Filed under schematics, the 2SC3993 PDF (107 KB) is far more likely a component datasheet, since the name is simply a JIS transistor part number.

Reference PDF for the 2SC5420 transistor, 69.2 KB, indexed as a schematic though the bare part number points to a component datasheet.

A small PDF filed as a schematic, though the name is simply the part number 2SC3468, which follows the Japanese JIS semiconductor scheme where the 2SC prefix marks an…

At 249 KB this PDF is the largest in the group and covers the 2SA1618, indexed as a schematic but in practice a transistor reference.

Datasheet PDF of 42.2 KB for the 2SA1883, identified only by its part number. Japanese JIS numbering uses 2SA for PNP bipolar transistors, so the content describes a…

Specifications for the 2SA1873 PNP transistor, provided as a 247 KB PDF. The 2SA prefix comes from the JIS semiconductor naming system and denotes a PNP bipolar part, so…

PDF reference sheet, 214 KB, for the 2N6282 discrete device, listed as a schematic but most likely a datasheet.

Very small PDF of 26.3 KB named with the part number 2N5639 and nothing else. Listed as a schematic, it is most plausibly a short datasheet, since 2N codes are JEDEC…