3.3V Zener Diodes and Multi-Voltage Kits
Browse nominal 3.3 V Zener diode choices for reverse-breakdown voltage references and shunt-regulation designs, plus multi-value menus and assortments that mention 3V3. A 3.3 V Zener is characterized at a stated reverse test current and temperature; it is not a self-contained, tightly regulated 3.3 V power rail. Check the selected variant before purchasing: many products in this collection offer other voltages, and some do not offer a 3.3 V option at all.
Identify the 3V3 part
- Axial through-hole: 1N4728/1N4728A 3.3 V appears in DO-41, 1 W-labelled single-voltage packs and broader 1N47xx menus. BZX55C3V3 appears in DO-35, 0.5 W-class selections. These are separate device families with their own test current, tolerance, package and thermal derating; verify the exact manufacturer's specifications.
- Surface-mount: BZX84C3V3 SOT-23 menu options, ZMM/LL34 or BZV55C 3V3 cylindrical SMD choices, ZM4728A LL-41 selections, and 1SMA4728A SMA/DO-214AC options appear in multi-grade listings. An SMB 1SMB5913B 3.3 V choice is also listed. Check the selected model and land pattern; a similar 3V3 label does not make these mechanical or electrical drop-in replacements.
- Assortments: DO-35/DO-41 packs and LL34 kits can include 3.3 V along with 3 V, 3.6 V, 5.1 V, 12 V and other values. Some menus let you order one voltage per pack, while other options supply a mixed set. An LL4148/1N4148 option is a switching diode, not a Zener; read the selected kit composition rather than assuming every piece is 3.3 V.
- Listings outside the target grade: this collection also contains dedicated 12 V 1N4742A and 1N5349B products, a 12 V SOT-23 listing, a 5.1 V SOD-123 product and 5.1/12 V-only choices. They are not 3.3 V substitutes. One long DO-41 title mentions 100 V, but its visible selectable grades stop at 43 V; do not assume every voltage in imported title text is an available option. Inconsistent package and generic voltage fields should be checked against the selected device documentation.
Specification and purchasing checklist
- Select the exact 3V3 part number and confirm its reverse breakdown range, test current, tolerance, temperature behavior and dynamic impedance. At very low current the voltage may fall short of the nominal value.
- Evaluate available bias current across actual source and load conditions, maximum dissipation and temperature-dependent derating for the selected package. Do not transfer one listing's 0.5 W, 1 W or 3 W label to another option.
- Confirm polarity marking and fit: axial DO-35 or DO-41 lead spacing versus SOT-23, LL34, LL-41, SMA or SMB board footprint and thermal path. If the application requires a regulated 3.3 V rail or transient protection, use a separately specified regulator or transient-rated device rather than assuming a Zener alone provides either.
- For a BOM, record the exact selected part, nominal breakdown voltage, test current and tolerance, thermal limits, package, quantity and assortment contents. Imported authenticity or certification claims are not proof of provenance or approval.
Frequently asked questions
Is 3V3 the same as an exact 3.3 V output?
No. 3V3 names a nominal breakdown grade. The actual voltage varies with the specified test current, tolerance and temperature, so validate the operating point in your design.
Can I replace a DO-41 1N4728A with a DO-35 BZX55C3V3?
Not by nominal voltage alone. Compare test current, tolerance, allowed dissipation after derating, dimensions and lead layout.
Is a 3.3 V Zener suitable for surge suppression?
A Zener's nominal voltage or continuous wattage does not establish transient-clamp performance. For surge protection select a documented TVS against the required waveform and clamping limits.
Does every product here include a 3.3 V device?
No. Some are other-voltage selections; kits may contain multiple grades. Confirm the exact selected variant and pack contents.
