The 2SC4721-Q is a silicon NPN epitaxial planar transistor manufactured by Rohm Semiconductor. This transistor is specifically designed for low-noise amplifier applications, particularly in VHF and UHF frequency ranges. The 'Q' suffix suggests it meets specific automotive or high-reliability standards.

Applications:

• Automotive electronics: Used in car radios, GPS systems, and other automotive communication devices.
• Low-noise amplifiers (LNA): Amplifies weak signals with minimal added noise in VHF/UHF receivers.
• RF front-ends: Used in radio receivers, televisions, and communication devices to boost the input signal.
• Oscillators: Can be used in oscillator circuits for generating radio frequencies.
• Mixers: Functions as a mixer in frequency conversion circuits.

Features:

• Low Noise Figure: Excellent noise performance, critical for weak signal amplification.
• High Gain: Provides substantial signal amplification.
• High Transition Frequency (fT): Suitable for high-frequency operation.
• Small Package: Allows for compact circuit designs.
• AEC-Q101 Qualified: Meets stringent automotive reliability standards.

Benefits:

• Enhanced Automotive Performance: AEC-Q101 qualification ensures reliable operation in harsh automotive environments.
• Improved Receiver Sensitivity: Low noise figure enhances the ability to detect weak signals.
• Increased Signal Strength: High gain boosts the signal level for improved processing.
• Efficient High-Frequency Operation: High transition frequency ensures optimal performance at VHF and UHF frequencies.
• Compact Design: Small package minimizes board space requirements.

Additional Details:

The 2SC4721-Q typically features a collector-emitter voltage (VCEO) of 20V, a collector current (IC) of 50mA, and a power dissipation (PC) of 250mW. Its noise figure is typically around 1.0dB at 200MHz. The transition frequency (fT) is typically around 7 GHz. It is packaged in a small surface-mount package, likely a SOT-23 or similar. The AEC-Q101 qualification indicates that the component has undergone rigorous testing to ensure its suitability for automotive applications, including temperature cycling, humidity resistance, and vibration tests.

Refer to the Rohm Semiconductor datasheet for precise specifications and application guidelines, particularly regarding the AEC-Q101 test results and specific operating conditions.