# ADD

> STM, ADI, TI, Xilinx, Altera. BOM sourcing, PCBA, 1G–800G optics. Since 2000. Hong Kong electronic components & optical transceiver distributor.

ADD Components Co., Limited was founded in Hong Kong to bridge a critical gap in the electronics supply chain. Industrial OEMs in Eastern Europe and Central Asia need fast, reliable access to high-end semiconductors and optical modules — without the risk of counterfeits or the delays of fragmented sourcing.  
Keywords: electronic components distributor Hong Kong, optical transceiver supplier, BOM procurement service, PCBA assembly, STM32 distributor, ADI distributor, TI distributor, Xilinx FPGA distributor, compatible SFP transceiver, QSFP28 module, global component sourcing  
Address: FLAT/RM C-13/F Harvard Commercial Building 105-111 Thomson Road, Wan Chai, HK  
Email: info@addcomponents.hk

- [Homepage](https://www.addcomponents.hk): ADD official website

## About us

- [About us](https://www.addcomponents.hk/about-us.html): ADD Components Co., Limited — Hong Kong electronic components distributor with 20+ years experience. STM, ADI, TI, Xilinx sourcing, optical transceivers, turnkey PCBA. Global delivery.


## Electronic Components

- [Electronic Components](https://www.addcomponents.hk/products.html): Electronic components by brand (STM, ADI, TI, Xilinx, Altera, Microchip) and application (UAV, industrial, medical, data center). Authorized sourcing, anti-counterfeit verified, global delivery.

- [BY APPLICATION](https://www.addcomponents.hk/products/by-application.html): Electronic components organized by application: UAV, industrial automation, data center, automotive, medical, aerospace, energy, telecom 5G. Find parts for your industry.
- [BY BRAND](https://www.addcomponents.hk/products/by-brand.html): Electronic components by manufacturer: STMicroelectronics, Analog Devices, Texas Instruments, Xilinx, Altera, Microchip. Series-level part numbers, specs, and procurement information.

## PCBA SERVICES

- [PCBA SERVICES](https://www.addcomponents.hk/pcba.html): Turnkey PCBA services: BOM procurement, SMT, through-hole, BGA, mixed-technology assembly, AOI & X-ray inspection, functional testing and box build. IPC Class 2 & 3. One purchase order.


## Optical Transceivers

- [Optical Transceivers](https://www.addcomponents.hk/optical-transceivers.html): Optical transceivers 1G to 800G: SFP, SFP+, SFP28, QSFP28, QSFP-DD, CFP2, OSFP. 100% compatibility tested, pre-coded for Cisco, Juniper, Arista, HPE. In-stock, global shipping.

- [SFP Transceivers | Enterprise Access, Industrial Ethernet, Telecom Access](https://www.addcomponents.hk/optical-transceivers/sfp.html): Complete SFP optical transceiver guide covering all variants: SX (850 nm MMF), LX (1310 nm SMF 10 km), EX (40 km), ZX (80 km), BiDi single-fiber, CWDM, and DWDM. Speeds from 100 Mbps to 2.5G CPRI. Ind
- [SFP-DD Transceivers | High-Density Server Interconnect, Next-Gen Access](https://www.addcomponents.hk/optical-transceivers/sfp-dd.html): SFP-DD (Double Density) transceiver portfolio: 25G fallback, 50G SR/LR (2×25G NRZ), and 100G SR/LR (2×50G PAM4). Physically backward compatible with SFP+/SFP28 cages. Twice the faceplate density of QS
- [SFP+ Transceivers | 10G Enterprise, Data Center Access, Storage SAN](https://www.addcomponents.hk/optical-transceivers/sfp-plus.html): Complete SFP+ 10G optical transceiver guide covering all variants: SR (850 nm MMF, 300 m OM3/400 m OM4), LR (1310 nm SMF, 10 km), ER (1550 nm, 40 km), ZR (80 km), LRM for legacy MMF, 8G/16G Fibre Chan
- [SFP28 Transceivers | Data Center Server Interconnect, 5G Fronthaul](https://www.addcomponents.hk/optical-transceivers/sfp28.html): Complete SFP28 25G optical transceiver guide covering all variants: SR (850 nm MMF, 70 m OM3/100 m OM4), LR (1310 nm SMF, 10 km), eLR (25 km), ER (40 km), BiDi single-fiber, and 25G CPRI/eCPRI for 5G 
- [QSFP56 Transceivers | 200G Data Center, 5G Backhaul](https://www.addcomponents.hk/optical-transceivers/qsfp56.html): Everything you need to know about QSFP56 200G transceivers: SR4, DR4, FR4, and LR4 variants with specification comparison table. PAM4 modulation, QSFP28 backward compatibility, and optimal use cases f
- [QSFP-DD Transceivers | Hyperscale Data Centers, Cloud, AI/ML Clusters](https://www.addcomponents.hk/optical-transceivers/qsfp-dd.html): Complete QSFP-DD 400G transceiver reference covering SR8, DR4, FR4, and LR4 variants. Specification comparison table, PAM4 signaling, FEC requirements, and backward compatibility with QSFP28. Ideal fo
- [CFP2 Transceivers | Telecom Long-Haul, Metro Aggregation, Coherent DWDM](https://www.addcomponents.hk/optical-transceivers/cfp2.html): Complete CFP2 transceiver portfolio: 100GBASE-LR4 (10km), 100GBASE-ER4 (40km), 200G LR4, and CFP2-DCO coherent optics (100G DP-QPSK, 200G DP-16QAM) for metro DWDM and DCI. Only pluggable form factor s
- [OSFP Transceivers | 800G Ethernet, AI Data Centers, HPC Interconnect](https://www.addcomponents.hk/optical-transceivers/osfp.html): Complete OSFP 800G transceiver portfolio: SR8 (100m MMF), DR8 (500m SMF), DR8+ (2km), 2×FR4 (2km dual CS), LR8 (10km CWDM8), and coherent OSFP. Preferred form factor for AI/ML clusters due to 15W ther
- [QSFP28 Transceivers | Data Center Spine-Leaf, Metro Networks, 5G Midhaul](https://www.addcomponents.hk/optical-transceivers/qsfp28.html): Complete guide to QSFP28 optical transceivers: 100G SR4, BiDi, PSM4, CWDM4, LR4, ER4, and AOC variants. Full spec comparison table, reach options from 100 m to 40 km. Trusted by cloud data centers wor

## Applications

- [Applications](https://www.addcomponents.hk/applications.html): Electronic components organized by application: UAV, industrial automation, data center, automotive, medical, aerospace, energy. Find the right parts for your industry — beyond brand search.

- [Data Center](https://www.addcomponents.hk/data-center.html): Data center electronic components and optical transceivers: FPGAs, DDR5 memory, PCIe switches, 100G-400G optics. Server, storage, networking — verified sourcing, global delivery.
- [Telecom & 5G](https://www.addcomponents.hk/telecom-5g.html): Telecom and 5G electronic components: RF front-end, GaN power amps, FPGAs, timing ICs, 25G/100G optical transceivers for fronthaul and backhaul. Carrier-grade verified sourcing.
- [Automotive](https://www.addcomponents.hk/automotive.html): AEC-Q100 automotive electronic components: MCUs, CAN/LIN transceivers, power management, LED drivers, sensors. NXP S32, STM SPC5, TI automotive — verified sourcing, global delivery.
- [Medical](https://www.addcomponents.hk/medical.html): Medical device electronic components: precision analog, low-power MCUs, reinforced isolators, MEMS sensors, high-resolution ADCs. High-reliability sourcing with full batch traceability.
- [Industrial Automation](https://www.addcomponents.hk/industrial-automation.html): Industrial automation electronic components: PLC processors, motor drivers, isolation ICs, Ethernet PHY, RS-485/CAN transceivers, IGBTs. Extended temperature — verified sourcing.
- [Aerospace & Defense](https://www.addcomponents.hk/aerospace-defense.html): Aerospace and defense electronic components: radiation-tolerant FPGAs, high-reliability MCUs, RF power, hermetic passives, mil-spec connectors. Anti-counterfeit verified sourcing.
- [Energy & Power](https://www.addcomponents.hk/energy-power.html): Energy and power electronic components: IGBTs, SiC MOSFETs, gate drivers, power modules, current sensors, DC-DC converters. Solar, EV charging, motor drives — verified sourcing.
- [UAV & Robotics](https://www.addcomponents.hk/uav-robotics.html): UAV and robotics electronic components: flight controller MCUs, ESC MOSFETs, IMU sensors, GPS modules, motor drivers, RF transceivers. STM32, GD32 — verified sourcing, global delivery.

## Blog

- [Blog](https://www.addcomponents.hk/blog.html): Electronic components & optical transceiver blog: sourcing guides, PCBA insights, semiconductor market trends. Technical guides, industry news, and company updates from ADD Components Hong Kong.

- [Latest Inventory](https://www.addcomponents.hk/latest-inventory.html): Latest inventory arrivals: newly stocked electronic components, optical transceivers 1G-800G, allocated part availability. Regular updates from ADD Components Hong Kong distributor.
- [Industry News](https://www.addcomponents.hk/industry-news.html): Semiconductor and optical transceiver industry news: supply chain allocation, FPGA shortages, DDR5 trends, optical module market forecasts. Market intelligence for procurement teams.
- [Company News](https://www.addcomponents.hk/company-news.html): ADD Components company news: PCBA service launches, optical transceiver inventory updates, distribution expansions, and event announcements. Hong Kong electronic components distributor.
- [Technical Guides](https://www.addcomponents.hk/technical-guides.html): Technical guides on electronic component selection, BOM procurement, PCBA assembly, optical transceivers, and counterfeit prevention. Engineering-level insights from ADD Components Hong Kong.

## Contact us

- [Contact us](https://www.addcomponents.hk/contact-us.html): Contact ADD Components Hong Kong for electronic component sourcing, optical transceiver quotes, and PCBA inquiries. BOM quotations within 24 hours. Email or WhatsApp.


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## Optional

- [Sitemap XML](https://www.addcomponents.hk/sitemap.xml): XML sitemap for search engines
- [Sitemap HTML](https://www.addcomponents.hk/sitemap.html): HTML sitemap for visitors
- [Full Content Index](https://www.addcomponents.hk/llms-full.txt): Complete content listing with all pages
- [Robots.txt](https://www.addcomponents.hk/robots.txt): Crawling rules for bots