, this classic handbook provides alpha-numeric lists for replacing low-power and high-power transistors with verified alternatives. Transistor Cross-Reference Guide : Found via Schematics For Free

Finding a "proper" equivalent requires matching more than just the part number. According to resources like Electronics Notes , several technical factors must be verified:

This custom PDF will be more accurate for your specific inventory (e.g., if you only stock BC547 and IRF540, your PDF only suggests those).