We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Blue DB-9 female to RJ-45 female adapter

Black Box Corporation

Black Box Corporation FA4509F-BL DB-9/RJ-45 adapter Blue

SKU CH-FWC6-3VRVM MPN FA4509F-BL

Blue DB-9 female to RJ-45 female modular adapter with gold-plated phosphor-bronze contacts and ABS housing

  • Changer TypeDB-9/RJ-45
  • ColorBlue
  • Weight0.05
  • DB-9 female to RJ-45 female serial-to-network conversion
  • Gold-plated phosphor-bronze contacts for reliable signal transfer
  • Blue ABS housing with PBT insulator for durability
  • WEEE and RoHS certified environmentally compliant design
  • Lightweight 0.05 kg adapter for portable installations

Blue modular adapter kit

The Black Box Corporation FA4509F-BL is a blue DB-9 to RJ-45 adapter designed for connecting serial equipment to network infrastructure. It suits installers and IT teams who need a simple gender-changing interface for legacy or industrial devices.

Thermals noise and power

As a passive connector the unit generates no heat and draws no power during operation. Gold-nickel plated phosphor bronze contacts maintain low resistance without active cooling or audible noise in normal use.

Build quality and daily use

The ABS housing and PBT insulator provide mechanical strength for repeated mating cycles. Female DB-9 and female RJ-45 ports allow direct cable-to-cable joining while WEEE and RoHS compliance confirms environmentally responsible materials.

Highlights

  • DB-9 female to RJ-45 female serial-to-network conversion
  • Gold-plated phosphor-bronze contacts for reliable signal transfer
  • Blue ABS housing with PBT insulator for durability
  • WEEE and RoHS certified environmentally compliant design
  • Lightweight 0.05 kg adapter for portable installations

Specifications

BrandBLACK BOX CORPORATION
Part NumberFA4509F-BL
Changer TypeDB-9/RJ-45
ColorBlue
Weight0.05
Shipping weight0.23 kg
Package size102 × 76 × 13 mm

Questions about this item

How do I wire the DB-9 female to the RJ-45 female on this Blue adapter, and which pin-out step do installers most often reverse?

Match each DB-9 signal to the corresponding RJ-45 contact using the straight-through pin map; the step most often reversed is swapping transmit and receive pairs on the RJ-45 side.

What maintenance will the gold-nickel contacts and phosphor bronze pins need over time?

No scheduled maintenance is required; if oxidation appears, clean gently with a dry contact brush and reseat the adapter.

At what point does the ABS housing or PBT insulator become the limiting factor during continuous serial traffic?

The ABS housing and PBT insulator remain stable well beyond normal serial signalling rates; the practical limit is the cable length and signal integrity of the connected DB-9 and RJ-45 links.

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.