Teardown: HUAWEI 400G QSFP112 Optical Module MTRQ-4S105
2026-07-13 · Compiled by Best IT Parts from public industry reporting
This teardown examines the HUAWEI 400G QSFP112 optical module, model MTRQ-4S105. It features 4 independent 100G optical transceiver channels using 850nm VCSEL multimode technology, supporting up to 100m transmission over multimode fiber for data center interconnect applications. The all-metal housing integrates cooling fins and internal thermal pads for heat dissipation. At its core, a Broadcom BCM87840A1KEFBG PAM4 DSP handles 4-channel 112Gbps signal processing. An STMicroelectronics STM32L431C6 ultra-low-power Cortex-M4 MCU manages status reporting, monitoring, and fault alerts. The power path uses a Monolithic Power Systems MP5087 load switch supporting up to 7A. Optical connectors are fully potted, while the housing features sealing gaskets and EMI shielding springs. This mature design represents a mainstream 400G optical module solution for short-reach AI data center interconnects.
Need this part in volume?
Best IT Parts supplies wholesale laptop power adapters, server power supplies and replacement parts, with OEM/ODM and private-label options.
Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.