This part is a kind of semiconductor called RP1239.

Function of this product has 315.0 MHz SAW Resonator.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

® RP1239 315.0 MHz SAW Resonator • • • • Designed for 315 MHz Transmitters Nominal Insertion Phase Shift of 180° at Resonance Quartz Stability Rugged, Hermetic, Low-Profile TO39 Case The RP1239 is a two-port, 180° surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It provides reliable, fundamental-mode, quartz frequency stabilization of low-power AM and FSK transmitters operating at 315.0 MHz for use in the United Kingdom under DTI MPT 1340 and in the USA under FCC Part 15. Applications include remote-control and wireless security devices. This is a pin-for-pin replacement in preexisting transmitter circuits utilizing two-port, 180° SAW resonators. Absolute Maximum Ratings Rating CW RF Power Dissipation (See: Typical Test Circuit) DC Voltage Between Any Two [ ... ]

RP1239 PDF Datasheet Download