AF200 TRANSISTOR PNP 0.02A 25V

Precision AF200 Germanium Transistor for High-Frequency TV Circuits

The AF200 Transistor functions as a high-performance PNP Germanium mesa transistor, specifically engineered for Intermediate Frequency (IF) amplification in television receivers. Developed during the peak of germanium semiconductor technology, this component remains a critical part for specialists restoring classic television sets and high-frequency communication equipment.

Optimized for High-Frequency Stability

Specifically, the AF200 excels in signal processing because it offers a high transition frequency ($f_T$) and low noise characteristics. Consequently, the transistor maintains high gain and signal clarity even in complex TV-IF strips. Furthermore, the device handles a collector-emitter voltage of up to 25V. This rating provides a stable operating margin for the precision power rails found in vintage tube-to-transistor hybrid systems. Moreover, its 20mA collector current capability supports active signal modulation without risking thermal drift. Transitioning to this original part ensures that your vintage video equipment recovers its factory-standard sharpness and signal lock.

Shielded TO-72 Design and Reliability

Additionally, the AF200 utilizes the professional TO-72 metal-can package style. This specific enclosure features a dedicated fourth lead for case grounding. Consequently, the transistor provides internal shielding against electromagnetic interference (EMI) and parasitic oscillations that often plague high-frequency circuits. Furthermore, the robust germanium junction provides the exact impedance matching required by original tuned-IF transformers. This stability makes the AF200 a preferred choice for restoring early color TV sets and sophisticated laboratory signal generators.

Moreover, technicians frequently install the AF200 in wideband amplifier stages. Specifically, its low collector capacitance ($C_{ob}$) ensures that signal speed remains high while phase shift remains minimal. Furthermore, because it features PNP germanium polarity, it integrates perfectly into legacy negative-logic or positive-ground chassis. Additionally, using genuine germanium semiconductors prevents the reception degradation or “image ghosting” often caused by forcing modern silicon parts into vintage video-frequency designs.

Verified Data Sheet (Technical Specifications)