BFG540

@@ -0,0 +1,47 @@+# BFG540++**Slkor SLKORMICRO Elec** · RF Amplifiers · SOT-143-4++BFG540 from Slkor SLKORMICRO Elec, in a SOT-143-4. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | C | passive | Collector of NPN transistor. Wide collector lead per SOT143B package. Max IC=120mA, BVCEO=15V, BVCBO=20V. |+| 2 | B | passive | Base of NPN transistor. BVEBO=2.5V. Drives high-gain low-noise RF amplifier operation up to fT=9GHz. |+| 3 | E | passive | Emitter of NPN transistor. Shared with pin 4 (dual emitter leads for improved grounding/thermal performance in SOT143B). |+| 4 | E | passive | Second emitter of NPN transistor, tied internally to pin 3. Dual emitter leads reduce parasitic inductance for microwave LNA use. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Slkor SLKORMICRO Elec |+| Package | SOT-143-4 |+| Category | RF And Wireless |+| Pins | 4 |++## Ordering variants++Same part, different packaging or reel option.++- `BFG540`+- `BFG540/X`++## CAD (KiCad official)++- Symbol: `BFG540`+- Footprint: `Package_TO_SOT_SMD:SOT-143`+- 3D model: SOT-143-4 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Slkor SLKORMICRO Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588917853520715776) (5 pp, sha256 `5b47e88954dfd847`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/bfg540-datasheet.pdf)

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