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.
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
markdownKRA105S-RTK
KEC Semicon · Digital Transistors · SOT-23
KRA105S-RTK from KEC Semicon, in a SOT-23. 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 | COMMON (EMITTER) | passive | 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. |
| 2 | IN (BASE) | input | 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. |
| 3 | OUT (COLLECTOR) | output | Collector output with a rated output voltage of -50 V and output current of -100 mA, with device power dissipation of 200 mW. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | KEC Semicon |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| 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 |
|---|---|---|---|---|---|---|---|
| Output Cut-off Current (KRA101S-106S, applies to KRA105S) | IO(OFF) | -500 | nA | VO=-50V, VI=0 | 2 | ||
| DC Current Gain (KRA105S) | GI | 80 | 200 | VO=-5V, IO=-10mA | 2 | ||
| Output Voltage (ON) (KRA101S-106S, applies to KRA105S) | VO(ON) | -0.1 | -0.3 | V | IO=-10mA, II=-0.5mA | 2 | |
| Input Voltage (ON) (KRA105S) | VI(ON) | -0.8 | -1.1 | V | VO=-0.2V, IO=-5mA | 2 | |
| Input Voltage (OFF) (KRA105S) | VI(OFF) | -0.5 | -0.65 | V | VO=-5V, IO=-0.1mA | 2 | |
| Input Current (KRA105S) | II | -3.6 | mA | VI=-5V | 2 | ||
| Input Resistor R1 (KRA105S) | R1 | 1.54 | 2.2 | 2.86 | kΩ | 2 | |
| Resistor Ratio R2/R1 (KRA105S) | R2/R1 | 17 | 21 | 26 | 2 | ||
| Output Voltage (absolute maximum, KRA101S-106S) | VO | -50 | V | 1 | |||
| Input Voltage (absolute maximum, KRA105S) | VI | -12 | 5 | V | 1 | ||
| Output Current (absolute maximum, KRA101S-106S) | IO | -100 | mA | 1 | |||
| Power Dissipation | PD | 200 | mW | 1 | |||
| Junction Temperature | Tj | 150 | 1 | ||||
| Storage Temperature Range | Tstg | -55 | 150 | 1 | |||
| Bias Resistor R2 (KRA105S nominal) | R2 | 47 | kΩ | 1 |
CAD (KiCad official)
- Symbol:
KRA105S-RTK - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
kra105s-rtk-etched.step/kra105s-rtk-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);kra105s-rtk.step/kra105s-rtk.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: KEC Semicon datasheet (6 pp, sha256
db5b473a62ff76f3, retrieved 2026-10-19, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).