C1124 Transistor Datasheet Better May 2026

(formally known as the ) is a high-voltage NPN silicon transistor originally manufactured by Sony and Hitachi, frequently found in classic audio equipment like Pioneer amplifiers. Finding a modern replacement requires careful attention to its unique combination of high voltage and power handling. Key Specifications (Datasheet Summary)

• 2SC2235: This is a very close cousin and is much easier to find. It has better linearity and is a standard "go-to" for these older types.
• 2SC1815: Extremely common. While the current rating is slightly lower (150mA vs 1A), for small signal audio stages, this is usually a drop-in replacement. Check the pinout!

2. Key Datasheet Parameters (What to look for)

| Parameter | Typical value | Meaning | |-----------|--------------|---------| | Type | NPN Silicon | Polarity | | VCEO | 20V | Max collector-emitter voltage | | VCBO | 30V | Max collector-base voltage | | IC | 50mA | Max continuous collector current | | PC | 200~300mW | Max power dissipation (depends on package: TO-92 or SOT-89) | | hFE (DC gain) | 50~250 (typ. 90) | Current gain @ 10mA | | fT | ~600 MHz | Transition frequency (RF use) | | NF | 3~5 dB | Noise figure (at ~100 MHz) | c1124 transistor datasheet better

This guide breaks down the critical specifications of the C1124, explains how to read the datasheet effectively, and suggests "better" modern alternatives for your repair projects. (formally known as the ) is a high-voltage