C1124 Transistor Datasheet 'link' -

These parameters describe how the transistor behaves under normal operating conditions.

: Exhibits satisfactory linearity of the forward current transfer ratio ( hFEh sub cap F cap E end-sub C1124 Transistor Datasheet

If it differs from the original C1124’s E-C-B, you will need to cross the leads or rotate the component. These parameters describe how the transistor behaves under

The (2SC1124) is a reliable, low-noise NPN small-signal transistor that was a workhorse in Japanese consumer electronics for decades. Its moderate voltage rating (50V), 100mA collector current, 80MHz transition frequency, and TO-92 package make it suitable for audio preamps, AM/FM IF stages, and general switching. While original parts are now obsolete, equivalents like the 2SC1815, BC548, or 2N3904 can replace it if you carefully match the pinout (E-C-B for the C1124) and electrical characteristics. Always consult the official C1124 transistor datasheet for characteristic curves and thermal data before integrating it into a new design or troubleshooting a vintage repair. Its moderate voltage rating (50V), 100mA collector current,

| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit | |-----------|--------|----------------|-----|-----|-----|------| | Collector Cutoff Current | (I_CBO) | (V_CB = 20V, I_E = 0) | - | - | 0.1 | µA | | Emitter Cutoff Current | (I_EBO) | (V_EB = 3V, I_C = 0) | - | - | 0.1 | µA | | DC Current Gain (hFE) | (h_FE) | (V_CE = 10V, I_C = 10mA) | 60 | 120 | 240 | - | | Collector-Emitter Saturation Voltage | (V_CE(sat)) | (I_C = 10mA, I_B = 1mA) | - | 0.15 | 0.3 | V | | Base-Emitter Voltage | (V_BE(on)) | (V_CE = 10V, I_C = 10mA) | 0.6 | 0.65 | 0.75 | V | | Transition Frequency | (f_T) | (V_CE = 10V, I_C = 10mA, f = 100MHz) | 300 | 450 | - | MHz | | Collector Output Capacitance | (C_ob) | (V_CB = 10V, f = 1MHz, I_E = 0) | - | 2.5 | 4.0 | pF | | Input Capacitance | (C_ib) | (V_EB = 0.5V, f = 1MHz) | - | 4.0 | 6.0 | pF | | Power Gain (MSG) | (G_pe) | (V_CE = 10V, I_C = 10mA, f = 100MHz) | 15 | 20 | - | dB | | Noise Figure | (NF) | (V_CE = 6V, I_C = 1mA, f = 100MHz) | - | 3.0 | 6.0 | dB |

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