If you’re able to ID your transistor based on the markings but the specific part is no longer available, look for an alternative by taking some of the most important identifying characteristics and narrowing it down from there. Looking for an Alternative: Transistor Type If no technical datasheet/identifying part information is available for the reference part, searching for alternatives increases substantially in difficulty. Please note: this guide is written with the assumption that a datasheet/spec sheet is available for the reference part that provides relevant information for searching for an alternate part. What if the part you’re searching for is obsolete and you can’t get the exact part? We’ll outline some additional steps and helpful search parameters below. Common strings to help identify some information on your part marking for what a potential part identifier could be are below (but not comprehensive):īJTs: 2Nxxxx, BCxxx, TIPxxx, MMBTxxx, 2SAxxx, 2SBxxx, 2SCxxx, 2SDxxxįETs: 2N700x, 2SJxxx, 2SKxxx, IRFxxx, MPSxxx, DMNxxx.You may have to search with different segments of your transistor part markings before you get a result.Tips to effectively search for an ID on your original part online: Some markings can indicate other things such as date codes, or some smaller parts may have encoded markings that aren’t easily searchable. Typically the production status and ID on your transistor can be found by searching for the markings online, however please note not all markings on the part will be relevant to a part number. Parts similar to the above transistor can be found by typing “bc547” into the Digi-Key search bar, or by typing in “bc547 transistor” in a search engine. Transistors typically come with full or partial type numbers printed on the body of the part. Identify Transistor Type Based on Markings Here are the general steps taken to help to determine potential alternatives:
This guide will help break down the steps we commonly take when looking for alternatives and which important parameters to use to help find the best options for a suitable replacement. We often get inquiries from customers looking for replacements on a variety of transistors - some of which aren’t available in our inventory due to obsolescence or a variety of other reasons.
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