This part is a kind of semiconductor called 45N20B.
Function of this product has CRYSTAL FILTERS.
Manufacturers : ETC
Image and pinout :
Some of the text within the PDF file :
45MHZ SERIES MCF s Features 8 Compactness and light weight 8 Excellent design against shock/vibration 8 Low impedance s 45MHz Fundamental Model 45S15BU 45S20BJ 45S30AJ 45S30BN 45S34AD Nominal Frequency (MHz) 45 45 45 45 45 Pole 4 4 2 4 2 Pass Bandwidth (dB) 3 3 3 3 3 (kHz) ±7.5 ±10 ±15 ±15 ±17 Attenuation Bandwidth (dB) 25 25 15 35 15 (kHz) ±22 ±25 ±50 ±50 ±60 Ripple (dB) 1.0 1.0 1.0 1.0 1.0 Inser- Guaranteed tion Attenuation Loss (fo-910kHz) (dB) (dB) 4.0 80 3.0 2.0 4.0 2.5 80 40 80 65 Terminating Impedance (Ω// pF) 650//3 CC=9pF 800//2 CC=6.5pF 1200//1.5 800//1.8 CC=6.5pF 870//–0.2 Operating Temp. Range (˚C) –20~+70 –20~+70 –20~+70 –20~+70 –30~+80 Type D-361-B D-361-B D-361-A D-361-B D-361-A Model : 45S15BU 100 ATT.(dB) 90 80 70 60 50 40 30 (A) (B) D-361-A~B [ ... ]