This part is a kind of semiconductor called 451AN-xxx.

Function of this product has Variable Coils.

Manufacturers : TOKO

Image and pinout :

Some of the text within the PDF file :

108 TYPE 5P/5PG 5PA/5PAG Variable Coils Meeting Your Needs 5mm TYPE 5P, 5PG, 5PA, 5PAG Frequency Range: Inductance Range: 5P, 5PG 0.2~2.0MHz, 5PA, 5PAG 0.1-1MHz 5P, 5PG High Frequency 1-15MHz 5P, 5PG 30-680µH 5P, 5PG High Frequency 1-40µH 5PA, 5PAG 100µH-4.5mH Temperature Coefficient: TC (L) of 5P, 5PG 850± 350ppm/°C 5PA, 5PAG 750± 450ppm/°C and 5P, 5PG High Frequency 220± 220ppm/°C. With Internal Capacitor TC (F) of 5P, 5PG or 5P, 5PG High Frequency 0± 250ppm/°C Optional Internal Capacitance Value:(1) (2) (See selection guide) Features • Low profile for compact designs. ( ): 5PA, 5PAG Unit: mm STANDARD COILS SELECTION GUIDE (1) The 5P is available with the following internal ceramic capacitors: 180, 470, 1500pF for standard AM applications. (2) 5P High Frequency is av [ ... ]

451AN-xxx PDF Datasheet Download