1N4733A
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Diodes Inc 5.1 V 1 W Zener diode, DO-41. Voltage reference and clamping. Datasheet-verified.
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markdown1N4733A
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 (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).