component
KTC4378-Y-RTF
Public Made by Adomby adom
KEC Semicon Bipolar Transistors - BJT, SOT-89-3L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownKTC4378-Y-RTF
KEC Semicon · Bipolar Transistors - BJT · SOT-89-3L
KTC4378-Y-RTF from KEC Semicon, in a SOT-89-3L. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BASE | input | Base of the NPN transistor, controlling collector current (IC max 1 A DC, 2 A pulse; VEBO max 5 V). |
| 2 | COLLECTOR | passive | Collector (also the heat sink tab) with VCEO of 60 V, VCBO of 80 V, and IC max of 1 A DC (2 A pulse). |
| 3 | EMITTER | passive | Emitter of the NPN transistor, normally connected to the common or ground return of the load circuit. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | KEC Semicon |
| Package | SOT-89-3L |
| Category | Transistors |
| Pins | 3 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Collector Cut-off Current | ICBO | 100 | nA | VCB=50V, IE=0 | 1 | ||
| Emitter Cut-off Current | IEBO | 100 | nA | VEB=4V, IC=0 | 1 | ||
| DC Current Gain (Y rank) | hFE(1) | 120 | 200 | VCE=2V, IC=50mA | 1 | ||
| DC Current Gain | hFE(2) | 30 | VCE=2V, IC=1A | 1 | |||
| Collector-Emitter Breakdown Voltage | V(BR)CEO | 60 | V | IC=1mA, IB=0 | 1 | ||
| Collector-Emitter Saturation Voltage | VCE(sat) | 0.15 | 0.5 | V | IC=500mA, IB=50mA | 1 | |
| Base-Emitter Saturation Voltage | VBE(sat) | 0.85 | 1.2 | V | IC=500mA, IB=50mA | 1 | |
| Transition Frequency | fT | 150 | MHz | VCE=10V, IC=50mA | 1 | ||
| Collector Output Capacitance | Cob | 12 | pF | VCB=10V, f=1MHz | 1 | ||
| Collector-Base Voltage | VCBO | 80 | V | Ta=25℃ | 1 | ||
| Collector-Emitter Voltage | VCEO | 60 | V | Ta=25℃ | 1 | ||
| Emitter-Base Voltage | VEBO | 5 | V | Ta=25℃ | 1 | ||
| Collector Current DC | IC | 1 | A | Ta=25℃ | 1 | ||
| Collector Current Pulse | ICP | 2 | A | Ta=25℃ | 1 | ||
| Collector Power Dissipation | PC | 500 | mW | Ta=25℃ | 1 | ||
| Collector Power Dissipation, ceramic substrate | PC* | 1 | W | Package mounted on ceramic substrate (250mm2 x0.8t) | 1 | ||
| Junction Temperature | Tj | 150 | °C | 1 | |||
| Storage Temperature Range | Tstg | -55 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
KTC4378-Y-RTF - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files:
ktc4378-y-rtf-etched.step/ktc4378-y-rtf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ktc4378-y-rtf.step/ktc4378-y-rtf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: KEC Semicon datasheet (3 pp, sha256
949f3c39122bb37a, retrieved 2026-10-27, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).