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400G QSFP112 DR4
400G Optical Transceiver

400G QSFP112 DR4

SKU / P/N: PHOS-4QFSD45M121

400G DR4 optical transceiver for AI data center, GPU cluster, reseller and system-integrator projects.

Data Rate
425Gbps
Form Factor
single-port QSFP112
Standard
DR4
Reach
500m @ SMF
Connector
single MPO-12/APC
Max Power
9W
Spot Available Lead time: 2–4 weeks
Bulk package:
Custom Quote
Custom bulk order? Beyond 2000 pcs, mixed models or annual supply — use Custom Quote to negotiate your discount offline.

Bulk availability changes frequently. Discounts shown are indicative volume tiers — submit an RFQ to confirm the latest price, lead time and allocation. Prices are provided by quote — no public list price.

Link-up guaranteedCoded to any switch / NIC platform
Lifetime warrantyAdvance replacement
Ships from US warehouseFast, no import hassle
Per-unit testedTest report + power-on video

Product description

This generic-compatible QSFP112 transceiver is a 400Gb/s single-port QSFP112 DR4 single-mode parallel module with a single 4-channel MPO-12/APC fiber interface. The short-reach 4-channel (DR4) design uses 100G-PAM4 modulation and reaches up to 500 m over OS2 single-mode fiber.

The QSFP112 transceiver can be used in QSFP112/QSFP-DD switches and Ethernet adapters. With low latency, low power consumption and high reliability, it uplinks to 800G Ethernet switches in spine-leaf fabrics and interoperates with 400G QSFP-DD or OSFP DR4. When connected with a 1:2 breakout cable, only two channels are active on the branch side — the module automatically runs at 200G with reduced power.

An ideal solution for supercomputing, it integrates seamlessly into compute and storage infrastructure for efficient high-performance interconnect.

Product highlights

  • Integrated low-power DSP for stable performance at scale
  • Optimized power budget, max power consumption 9W
  • Compliant with QSFP112 MSA and IEEE802.3bs and IEEE802.3ck standards
  • Supports breakout to lower-rate links for flexible fabric design
  • Backward compatible with existing QSFP form-factor ports
  • Tested on live switch / NIC platforms to ensure performance, quality and reliability

Applications

  • AI data center & GPU cluster interconnect
  • Spine-leaf switching fabric
  • 400G to breakout links in high-density fabrics
  • Hyperscale, cloud and high-performance computing networks

Supply status meaning

In stock or short-notice availability

Data Rate425Gbps
Max Data Rate4x106.25Gbps
Form Factorsingle-port QSFP112
StandardDR4
Lanes4
Rate per Lane106.25Gbps PAM4
Reach500m@SMF
MediaSMF
Fiber Typesingle-mode fiber (SMF)
Connectorsingle MPO-12/APC
Connector PolishAPC
Wavelength1311nm
Max Power9W
Operating Temperature0 to 70C (32 to 158F)
Optical Modulation4x100G-PAM4
Electrical Modulation4x100G-PAM4
FECInbuilt FEC: Yes
IEEE ComplianceIEEE802.3bs和IEEE802.3ck
MSA ComplianceQSFP112 MSA
ProtocolsQSFP112 MSA,IEEE 802.3bs、IEEE 802.3ck,CMIS5.1
Host Interfacesingle-port QSFP112
Warranty5

Four bulk tiers — the larger the volume, the better the discount. Actual pricing is confirmed by RFQ based on quantity, customer tier and lead time; there is no single-unit retail.

PackageQuantityVolume discountBest for
Starter Pack 100 pcs Base bulk price Trial order / small channel Request Quote
Growth Pack 500 pcs Save ~5% vs. Starter Reseller / regular supply Request Quote
Project Pack Popular 1000 pcs Save ~10% vs. Starter AI data center project Request Quote
Strategic Pack 2000 pcs Save ~15% vs. Starter Annual / channel agreement Request Quote
Custom bulk order 2000+ pcs Negotiated offline Annual / strategic supply Contact Sales

Ask a compatibility question

Need this model to match a specific switch, NIC or OEM coding? Send us the platform and we'll confirm compatibility and coding options.

  • Compatible coding for major switch / NIC platforms on request
  • Alternative model recommendations
  • Breakout and cabling guidance

Supply & compliance FAQ

How do the proposed FCC rules on optical transceivers affect availability?

The FCC rulemaking reported in August 2026 is still a draft. As reported, it would apply to new model authorizations, while models already deployed and shipping would continue to be supplied. Current PhoScale shipments are unaffected, and we hold inventory in our US warehouse. We track the rulemaking closely and publish updates on our Insights page.

Can you provide compliance documentation for your transceivers?

Yes. Every SKU ships with per-unit test reports, and compliance documentation (FCC, FDA laser, RoHS) is available on request as part of our ongoing compliance program.

How do you protect buyers against supply-chain disruption?

Three ways: US-warehouse stock for immediate needs, multi-source manufacturing across tier-one Asian production partners, and allocation planning for project and annual-supply customers. See our Supply Assurance page for details.

What lead times should we plan for on 800G and 1.6T optics?

In-stock models ship from our US warehouse immediately. For volume orders, typical lead times are 2–6 weeks depending on model and quantity — submit an RFQ for a confirmed date against current allocation.

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