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Small rectangular black sealed DC buck converter module

GCON

GCON 12V to 9V 2A 18W DC/DC Buck Power Converter gender changer

SKU CH-Y5YW-H051K

Converts 12 V input to a fixed 9 V output at up to 18 W with 90 % efficiency, plus over-temperature and over-current protection in a waterproof, shock-resistant housing

  • Fixed 9 V output from 12 V input
  • 18 W capacity with 90 % conversion efficiency
  • Over-temperature and over-current protection built in
  • Waterproof, anti-shock, moisture-proof and dust-proof potting
  • Synchronous rectification for low heat and low power draw

GCON 12V to 9V Step-Down Converter

This GCON buck converter steps a 12 V DC source down to a fixed 9 V output at up to 2 A, delivering 18 W for routers, LED strips or small embedded boards. Synchronous rectification keeps efficiency up to 90 %, so the module runs cool in continuous operation. A potted glue coating makes the unit waterproof, dust-proof and resistant to shock and moisture. Over-temperature and over-current protection guard the load and the converter itself.

Replaces Bulky Linear Regulators

Swap a wasteful linear regulator or an oversized AC adapter for this compact module when the input stays at least 3 V above the 9 V output. The efficiency jump is worth it in battery-powered or enclosed projects where heat dissipation is limited and every milliampere of run-time counts. It is not for designs that need adjustable voltage, isolated outputs or input voltages below 12 V.

18 W Continuous Headroom

The converter comfortably powers 9 V loads up to 2 A, such as development boards, sensor arrays or portable audio gear, with minimal voltage droop. Beyond 2 A the over-current protection engages, so it cannot drive higher-power motors or charge large battery packs. The 90 % conversion rate means roughly 2 W of heat at full load, which the sealed case handles without external heatsinking.

How it compares

Measured against everything we stock in Other Adapters & Couplers, at today’s prices. Recalculated every night.

Price $20.99
Pricier than about 60% of the 1,761 comparable items (median $18.99).

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Specifications

No published specifications for this item yet.

Questions about this item

What input voltage range does this 12V to 9V buck converter require?

The module needs at least 12V input because the output is fixed at 9V and the minimum differential pressure is 3V.

How do I wire the converter correctly and what common mistake should I avoid?

Connect the higher-voltage source to the input terminals and the load to the 9V output; reversing the connections will prevent operation because a buck converter only steps voltage down.

Does the potted, waterproof housing need any periodic maintenance?

The glue-craft sealing is moisture-proof and dust-proof, so no routine servicing is required unless the unit is physically damaged.

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