{"id":20053,"date":"2026-08-14T06:26:35","date_gmt":"2026-08-14T06:26:35","guid":{"rendered":"https:\/\/www.fibermall.com\/blog\/?p=20053"},"modified":"2026-09-08T09:13:30","modified_gmt":"2026-09-08T09:13:30","slug":"sfp28-power-consumption-25g-wattage-thermal-guide","status":"publish","type":"post","link":"https:\/\/www.fibermall.com\/blog\/sfp28-power-consumption-thermal-guide.htm","title":{"rendered":"SFP28 Power Consumption: 25G Wattage & Thermal Guide"},"content":{"rendered":"\n

 A 48-port switch that draws 45 W empty can pull over 100 W once every port has an SFP28 optic in it. Most teams find this out at the breaker, not in the planning spreadsheet.<\/p>\n\n\n\n

That gap is why SFP28 power consumption<\/strong> keeps showing up in deployment meetings. One module at 1.2 W sounds like nothing. Multiply that by a few hundred ports and it stops being nothing. It becomes heat, PDU load, and airflow you have to design for.<\/p>\n\n\n\n

This guide walks through real per-module wattage data for SR, LR, ER, and cable options, the switch and rack math that turns watts into a budget, and the temperature classes that decide whether a module survives its environment. If you are new to the 25G form factor itself, our complete SFP28 transceiver guide <\/u><\/a>covers the basics first.<\/p>\n\n\n\n

\"What<\/figure>\n\n\n\n
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Table of Contents<\/p>\nToggle<\/span><\/path><\/svg><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n