# Attenuator BlueOptics SFA21XK3 LC 3dB Silver

**URL:** https://aio.lv/en/product--blueoptics-sfa21xk3--11262558
**Data updated:** 2026-03-07 19:55 (EET)
**Category:** Fiber Optic Cables
**Manufacturer:** BlueOptics
**Manufacturer code:** SFA21XK3
**EAN:** 4063232230283
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 53.99 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 44.62 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blueoptics-sfa21xk3--11262558

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

The BlueOptics SFA21XK3 attenuator provides a reliable 3 dB attenuation for LC connections. Its silver color adds a sleek touch to your network setup. Ideal for managing signal strength in fiber optic networks, this attenuator ensures optimal performance and minimizes signal distortion. Perfect for both professional and personal use, it enhances the efficiency of your network without compromising quality.

## Long description

The BlueOptics SFA21XK3 LC 3dB Silver attenuator provides a precise 3 dB reduction for LC/UPC simplex connections in multimode 50/125 µm fiber links at 850 nm. Designed for situations where high transmitter power could overload a receiver over short distances, this inline fiber attenuator uses a zirconia ceramic ferrule and branded fiber components to maintain signal quality while lowering optical power. The silver housing offers a compact, durable form factor suitable for rack and patch-panel installations and field use.
Advantages
This attenuator delivers a stable 3 dB attenuation with low additional input loss and high return loss values. Manufactured with high-quality materials—branded multimode fiber and reliable LC/UPC connectors with a zirconia ceramic ferrule—it supports up to 1500 mating cycles. Devices are tested with interferometer and OTDR; each unit ships with a measurement protocol for input loss and return loss. The unit is rated for operation in a wide temperature range and features an LSZH (low smoke zero halogen) housing that reduces smoke and avoids halogen emissions in case of fire.
Suitable for
Adjusting signal power in multimode 50/125 µm fiber links (850 nm)
Short-distance links where transmitter power must be reduced to protect receivers
Patch panels, fiber patch cords and lab test setups requiring LC/UPC simplex connections
Environments that require low-smoke, halogen-free cabling materials
Key specifications
Attenuation: 3 dB nominal
Connector type: LC/UPC simplex
Fiber type supported: Multimode 50/125 µm
Operating wavelength: 850 nm
Ferrule: Zirconia ceramic
Return loss: High return loss (measured and provided in the protocol)
Temperature range: -40 °C to +75 °C
Housing: Silver color, LSZH (low smoke zero halogen)
Mating durability: Up to 1500 mating cycles (connector-rated)
How to use
Insert the LC/UPC simplex connector of the attenuator inline between the transmitting device and the receiving device, ensuring clean connector endfaces before connection. Use appropriate dust caps when the attenuator is not in use to protect the ferrule. Verify the optical power levels after installation using an optical power meter to confirm that the 3 dB attenuation achieves the intended signal reduction. If further adjustment is required, choose a different attenuation value from the BlueOptics product range.
Usage recommendations
Clean connector endfaces with suitable fiber cleaning tools before mating, avoid excessive bending of the fiber around the attenuator, and store the unit with protective caps when not connected. Refer to the supplied measurement protocol to confirm input and return loss values and verify compatibility with your multimode 850 nm equipment.

## Specifications

| Feature | Value |
|---|---|
| Connector(s) | LC |
| Product colour | Silver |
| Temperature range (T-T) | -40 - 75 |
| Attenuation | 3 dB |
| Sustainability compliance | Yes |
| Warranty period | 25 year(s) |
| Compliance certificates | RoHS |

## FAQ

### How much does the Attenuator BlueOptics SFA21XK3 cost, and is it available for purchase?

The price is 53.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 29 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 23.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All BlueOptics products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized BlueOptics service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11262558/64084143_large.webp