Persamaan Transistor D998 B778

Both transistors use the MT-200 (Sanyo’s large, insulated power package) or sometimes TO-3P/TO-247 variants, though the classic Sanyo MT-200 is most common.

Note: Because the case is the collector, an insulating mica washer and thermal paste are required when mounting to a common heatsink (unless using a non-conductive thermal pad).

Most D998 and B778 transistors use the TO-220 package with the following pinout (looking at the front face): Persamaan Transistor D998 B778

(Note: Always verify the datasheet of the specific manufacturer, as Japanese transistor pinouts can sometimes vary, though B-C-E is standard for this series).

| 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 | Both transistors use the MT-200 (Sanyo’s large, insulated

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.

Karena banyak yang mencari persamaan, pedagang nakal menjual transistor "dijamin original" tapi palsu. Ciri-ciri fisik: Note: Because the case is the collector, an

| Ciri | Original Sanyo | Palsu (Aspal) | | :--- | :--- | :--- | | Berat | Berasa berat (chip tembaga besar) | Ringan seperti plastik | | Kaki (lead) | Tebal, mengkilap, keras | Tipis, mudah bengkok, kusam | | Tembaga belakang | Pola serat tembaga kasar | Halus seperti cermin murah | | Kode produksi | Ada lot number (misal: 9N2) | Hanya tulisan D998 besar | | Uji hFE (dengan Ic 1A) | >60 | <30 |

Test paling jitu: Gunakan transistor tester atau power supply 24V, beban lampu 5W/12V. Jika panas berlebihan tanpa sinyal, itu palsu.

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