2N3904TFR Application Guide

flux

I’ll verify the exact 2N3904TFR package and manufacturer data, then write a cited application guide in the project files. The current description conflicts between TO-92 and SOT-23, so I’ll resolve that before giving pinout or footprint guidance.

flux

The source listings identify 2N3904TFR as an onsemi TO-92 through-hole part, not SOT-23, but datasheet citation validation is still stalled after two attempts. I’ll save a clearly marked draft with primary-source links and flag the specifications and replacement compatibility that remain unverified.
Created a project doc

2N3904TFR Application and Usage Guide

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2N3904TFR Application and Usage Guide
The 2N3904TFR is identified in onsemi source listings as a general-purpose NPN bipolar junction transistor in a three-lead TO-92 through-hole package for small-signal amplification and switching. A common practical application is a GPIO-controlled low-side switch for a small resistive load, indicator LED, or appropriately protected relay coil.
Provisional draft — technical verification incomplete. Datasheet evidence extraction remained pending after two attempts; all manufacturer-derived specifications, pin assignments, dimensions, revision details, and alternative-part compatibility below are unverified transcriptions from source listings, not validated datasheet claims. Source links are supplied for manual checking, not as a substitu...

flux

I saved the seven-section 2N3904TFR Application and Usage Guide in project files, including wiring examples, resistor calculations, layout guidance, and source links. It remains a provisional draft: datasheet validation stalled, and the current part record contains conflicting package information; pinout, lead geometry, and replacement compatibility still require verification before publication or fabrication. For the stalled validation issue: Contact Support.
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Files

Pins

Symbol

Layout

3D View

Name
Pin #
Type
Section
Pin Group
Orientation
Order
Sub-symbol
Terminal Type
C
1
Unspecified
passive
B
2
Unspecified
INPUT
E
3
Unspecified
passive

2N3904TFR