component
MMBT4081RW
Public Made by Adomby adom
CBI Bipolar (BJT), SOT-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+62@@ -0,0 +1,62 @@+# MMBT4081RW++**CBI** · Bipolar (BJT) · SOT-323++MMBT4081RW from CBI, in a SOT-323. 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 | passive | Base terminal of the NPN transistor; the datasheet states no pin-specific limit, so it is bounded by the absolute maximum ratings (VEBO 7 V, IC 150 mA, TJ/Tstg -55 to +150 ℃). |+| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; emitter-base breakdown voltage V(BR)EBO is 7 V (min) at IE=50μA, and VEBO is rated 7 V. |+| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; rated VCBO 60 V, VCEO 50 V, IC 150 mA, and PC 200 mW at Ta=25℃. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | CBI |+| Package | SOT-323 |+| 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 |+|---|---|---|---|---|---|---|---|+| Collector-base breakdown voltage | V(BR)CBO | 60 | | | V | IC=50μA,IE=0 | 1 |+| Collector-emitter breakdown voltage | V(BR)CEO | 50 | | | V | IC=1mA,IB=0 | 1 |+| Emitter-base breakdown voltage | V(BR)EBO | 7 | | | V | IE=50μA,IC=0 | 1 |+| Collector cut-off current | ICBO | | | 0.1 | μA | VCB=60V,IE=0 | 1 |+| Emitter cut-off current | IEBO | | | 0.1 | μA | VEB=7V,IC=0 | 1 |+| DC current gain | hFE(1) | 120 | | 560 | | VCE=6V,IC=1mA | 1 |+| Collector-emitter saturation voltage | VCE(sat) | | | 0.4 | V | IC=50mA,IB=5mA | 1 |+| Transition frequency | fT | 180 | | | MHz | VCE=12V,IC=2mA,f=30MHz | 1 |+| Collector output capacitance | Cob | | | 3.5 | pF | VCB12V,IE=0,f=1MHz | 1 |+| Collector-Base Voltage | VCBO | | | 60 | V | | 1 |+| Collector-Emitter Voltage | VCEO | | | 50 | V | | 1 |+| Emitter-Base Voltage | VEBO | | | 7 | V | | 1 |+| Collector Current | IC | | | 150 | mA | | 1 |+| Collector Power Dissipation | PC | | | 200 | mW | | 1 |+| Thermal Resistance From Junction To Ambient | RΘJA | | | 625 | ℃/W | | 1 |+| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 | | 150 | ℃ | | 1 |++## CAD (KiCad official)++- Symbol: `MMBT4081RW`+- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`+- 3D model: SOT-323 (KiCad packages3D, STEP)+- 3D model files: `mmbt4081rw-etched.step` / `mmbt4081rw-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbt4081rw.step` / `mmbt4081rw.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [CBI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603359797886935040) (3 pp, sha256 `874534af2a2938a0`, retrieved 2026-10-17, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-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).++[Datasheet PDF](docs/mmbt4081rw-datasheet.pdf)
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