component
BSS138K-7
Public Made by Adomby adom
Diodes Incorporated MOSFETs, 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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Contents
README
markdownBSS138K-7
Diodes Incorporated · MOSFETs · SOT-23
BSS138K-7 from Diodes Incorporated, 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 | G | input | Gate, ESD-protected by an internal gate protection diode, with a maximum gate-source voltage of ±20 V and a threshold of 0.5 V to 1.5 V. |
| 2 | S | passive | Source terminal of the N-channel MOSFET, with a maximum continuous body-diode forward current of 0.5 A. |
| 3 | D | passive | Drain terminal of the N-channel MOSFET, rated for 50 V drain-source voltage and 0.31 A continuous drain current at TA = +25°C. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-23 |
| Category | Triode/MOS Tube/Transistor |
| 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 |
|---|---|---|---|---|---|---|---|
| Drain-Source Breakdown Voltage | BVDSS | 50 | V | VGS = 0V, ID = 250µA | 2 | ||
| Zero Gate Voltage Drain Current | IDSS | 1 | µA | TJ = +25°C, VDS = 50V, VGS = 0V | 2 | ||
| Gate-Source Leakage | IGSS | -10 | 10 | µA | VGS = ±20V, VDS = 0V | 2 | |
| Gate Threshold Voltage | VGS(TH) | 0.5 | 1.1 | 1.5 | V | VDS = VGS, ID = 250µA | 2 |
| Static Drain-Source On-Resistance | RDS(ON) | 1.3 | 3.5 | Ω | VGS = 10V, ID = 0.22A | 2 | |
| Diode Forward Voltage | VSD | 0.8 | 1.2 | V | VGS = 0V, ID = 0.22A | 2 | |
| Drain-Source Voltage | VDSS | 50 | V | TA = +25°C | 2 | ||
| Gate-Source Voltage | VGSS | -20 | 20 | V | TA = +25°C | 2 | |
| Continuous Drain Current | ID | 0.31 | A | VGS = 10V, Steady State, TA = +25°C, Note 6 | 2 | ||
| Continuous Drain Current | ID | 0.25 | A | VGS = 10V, Steady State, TA = +70°C, Note 6 | 2 | ||
| Maximum Continuous Body Diode Forward Current | IS | 0.5 | A | Note 6 | 2 | ||
| Pulsed Drain Current | IDM | 0.8 | A | 10µs Pulse, Duty Cycle = 1% | 2 | ||
| Total Power Dissipation | PD | 0.38 | W | Note 5, min recommended pad layout | 2 | ||
| Thermal Resistance, Junction to Ambient | RθJA | 338 | °C/W | Steady State, Note 5 | 2 | ||
| Total Power Dissipation | PD | 0.54 | W | Note 6, 1" x 1" FR-4 2oz Cu | 2 | ||
| Thermal Resistance, Junction to Ambient | RθJA | 237 | °C/W | Steady State, Note 6 | 2 | ||
| Operating and Storage Temperature Range | TJ, TSTG | -55 | 150 | °C | 2 | ||
| Input Capacitance | Ciss | 23.2 | pF | VDS = 25V, VGS = 0V, f = 1.0MHz | 2 | ||
| Output Capacitance | Coss | 3.1 | pF | VDS = 25V, VGS = 0V, f = 1.0MHz | 2 | ||
| Reverse Transfer Capacitance | Crss | 2.2 | pF | VDS = 25V, VGS = 0V, f = 1.0MHz | 2 | ||
| Gate Resistance | Rg | 69 | Ω | VDS = 0V, VGS = 0V, f = 1MHz | 2 | ||
| Total Gate Charge (VGS = 4.5V) | Qg | 0.45 | nC | VDS = 25V, ID = 0.2A | 2 | ||
| Total Gate Charge (VGS = 10V) | Qg | 0.95 | nC | VDS = 25V, ID = 0.2A | 2 | ||
| Gate-Source Charge | Qgs | 0.1 | nC | VDS = 25V, ID = 0.2A | 2 | ||
| Gate-Drain Charge | Qgd | 0.14 | nC | VDS = 25V, ID = 0.2A | 2 | ||
| Turn-On Delay Time | tD(ON) | 3.2 | ns | VDS = 25V, VGS = 10V, RG = 50Ω, ID = 0.2A | 2 | ||
| Turn-On Rise Time | tR | 2.5 | ns | VDS = 25V, VGS = 10V, RG = 50Ω, ID = 0.2A | 2 | ||
| Turn-Off Delay Time | tD(OFF) | 13.8 | ns | VDS = 25V, VGS = 10V, RG = 50Ω, ID = 0.2A | 2 | ||
| Turn-Off Fall Time | tF | 7.6 | ns | VDS = 25V, VGS = 10V, RG = 50Ω, ID = 0.2A | 2 | ||
| Reverse Recovery Time | tRR | 8.8 | ns | IF = 0.2A, di/dt = 100A/μs | 2 | ||
| Reverse Recovery Charge | QRR | 2.6 | nC | IF = 0.2A, di/dt = 100A/μs | 2 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | Copper | tin | Terminals: Finish, Matte Tin Annealed over Copper Leadframe. | 1 |
CAD (KiCad official)
- Symbol:
BSS138K-7 - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
bss138k-7-etched.step/bss138k-7-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bss138k-7.step/bss138k-7.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (7 pp, sha256
5f6c08a1bc589f8b, retrieved 2026-10-22, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).