2N491 - SILICON UNIJUNCTION TRANSISTORS

Digitron

Download the 2N491 datasheet PDF. This datasheet also covers the 2N489 variant, as both devices belong to the same silicon unijunction transistors family and are provided as variant models within a single manufacturer datasheet.

Key Features

Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number.
Available as non-RoHS (Sn/Pb plating), standard, and as RoHS by adding “-PBF” suffix.
Stable operation over wide temperature range.
Low leakage current.
Low peak point current.
Guaranteed minimum pulse voltage.

📥 Download Datasheet

2N491 silicon unijunction transistors by Digitron - Datasheet Preview — Note: The manufacturer provides a single datasheet file (2N489-Digitron.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number	2N491
Manufacturer	Digitron
File Size	1.45 MB
Description	SILICON UNIJUNCTION TRANSISTORS
Datasheet	2N491 Datasheet

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Other Datasheets by Digitron

Part Number	Description
2N491A	SILICON UNIJUNCTION TRANSISTORS
2N491B	SILICON UNIJUNCTION TRANSISTORS
2N490	SILICON UNIJUNCTION TRANSISTORS
2N490A	SILICON UNIJUNCTION TRANSISTORS
2N490B	SILICON UNIJUNCTION TRANSISTORS

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text

2N489(A,B)-2N494(A,B) High-reliability discrete products and engineering services since 1977 SILICON UNIJUNCTION TRANSISTORS FEATURES  Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number.  Available as non-RoHS (Sn/Pb plating), standard, and as RoHS by adding “-PBF” suffix.