1N4733A

@@ -0,0 +1,46 @@+# 1N4733A++**Diodes Incorporated** · Zener diode (1 W) · DO-41++A 5.1 V, 1 W Zener diode in the axial DO-41 package, from the 1N4728-1N4764 family. Reverse-biased past its 5.1 V breakdown it holds that voltage nearly constant while it conducts, which makes it a cheap voltage reference, a rail clamp that protects inputs from overvoltage, and a shunt regulator when paired with a series resistor. The 1 W rating (versus the 500 mW of a small SMD Zener like the BZT52C5V1) lets it absorb more current. The banded end is the cathode (pin 1); in a Zener circuit the cathode goes to the more positive side.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | K | passive | Cathode. Marked on the package with a polarity band. In normal Zener operation the cathode is the more positive terminal; reverse breakdown clamps the cathode-anode voltage to VZ (nominally 5.1 V for 1N4733A, or the value listed for the selected BZT52C variant in the datasheet's Electrical Characteristics table). |+| 2 | A | passive | Anode. Return terminal for Zener reverse-bias regulation and forward-bias conduction (VF = 0.9 V at IF = 10 mA per the Maximum Ratings table). |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Zener diode |+| Zener voltage (Vz) | 5.1 V (at 49 mA) |+| Power rating | 1 W |+| Tolerance | ±5% (A suffix) |+| Max Zener current | ~178 mA |+| Test current | 49 mA |+| Marking | band = cathode (pin 1) |+| Package | DO-41 (axial THT) |++## Ordering variants++- `1N4733A-T (DO-41)`+- `1N4733A-B (DO-41, bulk)`++## CAD (KiCad official)++- Symbol: `Device:D_Zener`+- Footprint: `Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal`+- 3D model: DO-41 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/ds18004.pdf) (5 pp, sha256 `0fbd7d137524820f`, 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/1n4733a-datasheet.pdf)

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