Persamaan Transistor D998 B778 Link

These values determine the performance of the transistor in a circuit.

  • Transition Frequency ($f_T$):
  • Saturation Voltage ($V_CE(sat)$):

    • | Characteristic | Condition | 2SD998 | 2SB778 | | :--- | :--- | :--- | :--- | | DC Current Gain (hFE) | VCE=4V, IC=5A | 55 ~ 220 | 55 ~ 220 | | Collector-Emitter Saturation Voltage | IC=8A, IB=0.8A | ≤ 1.5V | ≤ 1.5V | | Base-Emitter On Voltage | IC=5A, VCE=4V | ~1.0V | ~1.0V | | Transition Frequency (fT) | VCE=4V, IC=1A | 20 MHz | 15 MHz |

    Analysis: The hFE linearity from 0.5A to 10A is excellent for this type, minimizing crossover distortion. The fT of 15-20 MHz is ideal for audio (20Hz-20kHz), providing enough gain bandwidth for stability without risking parasitic RF oscillations when properly laid out. Persamaan Transistor D998 B778

    Catatan: Karena varian pabrikan berbeda, selalu merujuk datasheet resmi komponen yang Anda gunakan untuk nilai pasti Vce(max), Ic(max), Pd (daya disipasi), dan parameter termal.

    | Parameter | 2SD998 (NPN) | 2SB778 (PNP) | | :--- | :--- | :--- | | Collector-Base Voltage (Vcbo) | 180 V | 180 V | | Collector-Emitter Voltage (Vceo) | 160 V | 160 V | | Emitter-Base Voltage (Vebo) | 5 V | 5 V | | Collector Current (Ic) | 12 A (15 A peak) | 12 A (15 A peak) | | Power Dissipation (Pc) | 100 W | 100 W | | DC Current Gain (hFE) | 40 – 140 | 40 – 140 | | Transition Frequency (ft) | 25 MHz | 25 MHz | | Package | TO-3P (or TO-247) | TO-3P (or TO-247) | These values determine the performance of the transistor

    These are Darlington or high-gain single transistors (check datasheet – most versions are single BJT, not Darlington). They require proper biasing and a heat sink.

    | Original | Type | Direct Substitute | Comments | | :--- | :--- | :--- | :--- | | 2SD998 | NPN | 2SD1559 | Higher voltage rating, pin compatible. | | | | 2SD2012 | Good modern replacement. | | | | TIP41C | Caution: Pinout is usually B-C-E (matches), but TIP41C is slightly less robust in gain linearity for Hi-Fi. | | 2SB778 | PNP | 2SB1106 | Complementary match to D1559. | | | | 2SB1382 | Good modern replacement. | | | | TIP42C | Caution: Pinout is usually B-C-E (matches). Popular but lower audio quality. | Transition Frequency ($f_T$):

    Pro Tip for Repair: The pair 2SD1559 / 2SB1106 is often considered a superior modern replacement for the D998/B778 pair because they offer better power handling and reliability while maintaining the same pinout.

    Catatan: Nilai di atas adalah kisaran umum—untuk penggunaan aman, selalu rujuk datasheet pabrikan untuk varian spesifik.

    Finding an exact "persamaan" (equivalent) is often necessary for repairs. A suitable replacement must meet or exceed the original specifications, particularly regarding breakdown voltage and current handling.

    Top