IRF9540

@@ -0,0 +1,48 @@+# IRF9540++**Vishay Siliconix** · P-channel power MOSFET · TO-220++A P-channel power MOSFET in TO-220, the complement to the N-channel IRF540 and the usual choice for high-side switching and reverse-polarity protection. It blocks 100 V, carries up to 23 A, and turns on when the gate is pulled below the source, which is convenient for switching a load's positive rail from a ground-referenced control signal. Its on-resistance (about 0.20 ohm) is higher than an equivalent N-channel part, as is typical for P-channel devices. Pair it with an IRF540 to build an H-bridge or a complementary push-pull stage. The tab and pin 2 are the drain; pinout is G, D, S.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | G | input | Gate. Insulated MOSFET gate; VGS(th) = -2.0 V to -4.0 V, absolute maximum VGS = ±20 V. Drive to ~-10 V (source-referenced) for full enhancement (RDS(on) = 0.20 Ω); total gate charge Qg = 61 nC. |+| 2 | D | passive | Drain. Power terminal, internally connected to the mounting tab. VDS breakdown = -100 V, continuous ID = -19 A (TC = 25 °C), pulsed IDM = -72 A. Body diode cathode returns to this pin. |+| 3 | S | passive | Source. Power return terminal for the P-channel MOSFET; body/source-drain diode anode. Same current rating as drain (-19 A continuous). Reference for VGS drive. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | P-channel power MOSFET |+| Drain-source (VDS) | -100 V |+| Continuous drain current (ID) | -23 A |+| RDS(on) | 0.20 Ω at VGS=-10 V |+| Gate drive | standard (VGS=-10 V for full on) |+| Power dissipation | 150 W |+| Tab | electrically Drain |+| Pinout | G-D-S |+| Package | TO-220 |++## Ordering variants++- `IRF9540PbF (TO-220)`+- `IRF9540 (TO-220, tube)`++## CAD (KiCad official)++- Symbol: `Transistor_FET:IRF9540N`+- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`+- 3D model: TO-220 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Vishay Siliconix datasheet](https://www.vishay.com/docs/91078/91078.pdf) (7 pp, sha256 `e95ccd4f3a9181e0`, retrieved 2026-08-17, tier: manufacturer)+- **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/irf9540n-datasheet.pdf)

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