255 nm UVC LED Chips at the Range Edge

The range edge

The 255 nm band serves equipment whose own specification names a source at 255 nm. Jason's published chip range begins at 255 nm, so a specification written around this band is answered against a catalogue whose range starts there; which model and ratings are documented at this band are established per model in the enquiry exchange.

255 nm at Jason

Jason's published chip range begins at 255 nm. The forms in which this band is supplied — bare die, or a specific package format — are established per model in the enquiry exchange. The ratings recorded for a given model at this band are likewise established per model in that exchange.

Design notes for 255 nm

• Optics and windows: state the window material your design uses in the enquiry, so the confirmation answers the configuration the product will actually run.
• Dose budgeting: state the exposure geometry and the time your design allows in the enquiry, alongside the dose target.
• Enclosure: state the enclosure and interlock arrangement your design provides in the enquiry.

Alternatives to consider

If your specification allows it, compare a 255 nm design against 265 nm before locking the bill of materials. Where the band is fixed by validation or instrumentation requirements, send the target package and quantity with your enquiry and ask what documentation exists for the matching chip model.

What to include in a 255 nm enquiry

State the form you intend to build with — bare die or a named SMD package family — the centre-wavelength tolerance and bin definition your validation assumes, the drive point and duty the device will run at, and any test conditions your own protocol names. Ask what figures are recorded for the matching model against exactly those conditions, and have what exists confirmed in writing in the enquiry exchange, before the programme commits to a source.

Where a programme needs parts for its own validation work, state the quantity and the named model and bin in the enquiry, and ask whether evaluation quantities can be supplied for it.

A programme at this band can state its stage in the first message — evaluation or production — so the confirmation answers the stage the programme is at. Where a protocol fixes acceptance criteria — a wavelength window, an output floor at the drive point, a duty test — quote them verbatim in the enquiry, so the confirmation answers the protocol itself rather than a paraphrase of it.

255 nm in the catalogue record

The company's published chip range begins at 255 nm and runs to 340 nm. The named bands — 255, 265, 275, 280, 295 and 310 nm — sit inside that range. The band sits at the edge of that range, outside the 260–320 nm span the company publishes as its main production bands. The chip catalogue names three VF-series models; which band and ratings are documented for a given model is established per model in the enquiry exchange.

What the first message carries

The first message for this band carries the form to build with, the centre-wavelength tolerance and bin definition the validation assumes, the drive point and duty, the test conditions the buyer's own protocol names, the quantity required and the programme's stage — evaluation or production.