component
KRA105S-RTK
Public Made by Adomby adom
KEC Semicon Digital Transistors, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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"title": "KRA105S-RTK",
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"description": "Common emitter terminal of the built-in-bias PNP transistor, marked COMMON(+) in the equivalent circuit, with no separate voltage or current limit given for this pin."
},
{
"number": "2",
"name": "IN (BASE)",
"type": "input",
"description": "Base input through the internal input resistor R1 (2.2 kΩ for KRA105S), with a rated input voltage of -12 V to 5 V for this type."
},
{
"number": "3",
"name": "OUT (COLLECTOR)",
"type": "output",
"description": "Collector output with a rated output voltage of -50 V and output current of -100 mA, with device power dissipation of 200 mW."
}
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"extractor flagged: The datasheet covers the family KRA101S~KRA106S in one document, and the pinout is the same for all ; The emitter is labeled COMMON and is not called GND, so I used passive rather than power_in. Change ; The input voltage limit (-12 V to 5 V) and the input resistor value (2.2 kΩ) are the KRA105S values "
],
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"at": "2026-10-19T01:15:09"
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"cad": "KiCad official (CC-BY-SA 4.0)",
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"described": 3,
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"sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
"checked": "2026-10-19",
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"metadata": {
"specs": {
"Manufacturer": "KEC Semicon",
"Package": "SOT-23",
"Category": "Transistors/Thyristors",
"Pins": "3"
},
"characteristics": {
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"name": "Output Cut-off Current (KRA101S-106S, applies to KRA105S)",
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"kind": "electrical",
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"min": null,
"typ": null,
"max": -500,
"conditions": "VO=-50V, VI=0",
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{
"name": "DC Current Gain (KRA105S)",
"symbol": "GI",
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"min": 80,
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"conditions": "VO=-5V, IO=-10mA",
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"typ": -0.1,
"max": -0.3,
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},
{
"name": "Input Voltage (ON) (KRA105S)",
"symbol": "VI(ON)",
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"min": null,
"typ": -0.8,
"max": -1.1,
"conditions": "VO=-0.2V, IO=-5mA",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Input Voltage (OFF) (KRA105S)",
"symbol": "VI(OFF)",
"kind": "electrical",
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"min": -0.5,
"typ": -0.65,
"max": null,
"conditions": "VO=-5V, IO=-0.1mA",
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{
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"source_page": 2,
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},
{
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"typ": 2.2,
"max": 2.86,
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"source": "datasheet"
},
{
"name": "Resistor Ratio R2/R1 (KRA105S)",
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"unit": "",
"min": 17,
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{
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{
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{
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{
"name": "Power Dissipation",
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},
{
"name": "Junction Temperature",
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{
"name": "Storage Temperature Range",
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},
{
"name": "Bias Resistor R2 (KRA105S nominal)",
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"unit": "kΩ",
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]
}
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