100G QSFP28 to 4×25G SFP28 Passive DAC Breakout Cable: 100G-PDAC-QSFP-SFP
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100G QSFP28 to 4×25G SFP28 Breakout Overview
Our 100G QSFP28 to 4×25G SFP28 Passive DAC Breakout Cable enables seamless connectivity between 100G switches and 25G server interfaces. Supporting multi-rate operation from 44.8 to 112.2 Gbps with lengths from 1m to 5m, this AWG 26 twinax breakout provides cost-effective 100G to 25G migration. Operating at 0-70°C with zero power consumption, ideal for leaf-server deployments.
- Cable Type: Passive Direct Attach Cable (PDAC)
- Cable Configuration: Breakout (1 to 4)
- Connector Type: QSFP28 to 4×SFP28
- Supported Data Rate: 44.8 Gbps - 112.2 Gbps
- Maximum Distance: 5 m
- AWG (Wire Gauge): AWG30 (1-3.5m) | AWG28 (2-3m) | AWG26 (5m)
- DDM/DOM: Supported
- Temperature Range: Standard 0°-70°C
- MTBF: 1000000 hours
100G to 4×25G Breakout DAC Pricing
SKU:100G-PDAC-QSFP-SFP-1-MS100G-PDAC-QSFP-SFP-1-MS
Made to Order - 2 WeeksMade to Order - 2 Weeks100G QSFP28 to 4×25G SFP28 Passive DAC Breakout Cable Specification
Cable Type | Passive Direct Attach Cable (PDAC) |
Cable Configuration | Breakout (1 to 4) |
Connector Type | QSFP28 to 4×SFP28 |
Supported Data Rate | 44.8 Gbps - 112.2 Gbps |
Supported Ethernet Applications | 100G Ethernet (103.125 Gbps) |
Supported Fiber Channel Applications | 4x 32G Fiber Channel (112.2Gbps) |
Supported InfiniBand Applications | InfiniBand EDR (100 Gbps) |
Maximum Distance | 5 m |
Media Type | Twinax Copper Cable |
AWG (Wire Gauge) | AWG30 (1-3.5m) | AWG28 (2-3m) | AWG26 (5m) |
DDM/DOM | Supported |
Temperature Range | Standard 0°-70°C |
MTBF | 1000000 hours |
Compliance | CE, RoHS, QSFP28 MSA, SFP28 MSA, SFF-8402, SFF-8431, SFF-8665, QDR InfiniBand, InfiniBand EDR |
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100G QSFP28 to 4×25G SFP28 Passive DAC Breakout Cable Datasheet
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100G QSFP28 to 4×25G SFP28 Passive DAC Breakout Cable Description
The 100G-PDAC-QSFP-SFP is a multi-vendor compatible 100G QSFP28 to 4x SFP28 passive direct attach copper breakout cable built for high-density connectivity in data center environments. The cable splits a single QSFP28 connector into four independent SFP28 connectors, so one 100G switch port can connect to four separate 25G devices such as servers, storage systems, or aggregation switches. The passive design fans out a single high-density 100G port to four lower-speed 25G endpoints without adding an active component to the link.
The cable supports data rates from 44.8 to 112.2 Gbps across all four channels. For Ethernet, each channel carries 25G Ethernet with a 100G Ethernet aggregate throughput of 103.125 Gbps, matching host ports built around 25G NIC connectivity. Fibre Channel support covers 4x 32G FC at a 112.2 Gbps aggregate, and the cable also supports InfiniBand EDR at 100 Gbps for high-performance computing and storage fabrics.
As a passive DAC, the 100G-PDAC-QSFP-SFP needs no external power and adds no signal-processing latency. The twinax copper construction uses a wire gauge matched to cable length: AWG30 for 1 to 3.5 meters, AWG28 for 2 to 3 meters, and AWG26 for the 5 meter variant. This progressive gauge selection keeps signal integrity intact at 25 Gbps per lane across the supported length range, with a maximum reach of 5 meters.
The breakout configuration suits server connectivity in leaf-spine architectures, where a 100G top-of-rack switch port connects to four 25G server NICs. This lets a single 100G port serve four hosts, improving port utilization on the switch side while giving each server its own dedicated 25G link. Because the cable is passive, it draws no power and adds nothing to the switch's power budget.
The electrical interface follows the QSFP28 MSA, SFP28 MSA, SFF-8402, SFF-8431 and SFF-8665 specifications, giving the cable broad compatibility with standard host systems across multiple equipment vendors. The 100G-PDAC-QSFP-SFP family can be coded for multiple vendor-specific EEPROM identities, with vendor-coded variants listed separately by SKU. DDM/DOM (Digital Diagnostic Monitoring) is supported, reporting diagnostic data through the standard MSA interface.
The cable operates across a standard 0 to 70°C range with a rated MTBF of 1,000,000 hours, and is qualified against QDR InfiniBand and InfiniBand EDR specifications for high-performance fabric deployments.
The 100G-PDAC-QSFP-SFP is CE and RoHS compliant. Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical and copper platforms. Made to order, with a lifetime warranty. For project-quantity pricing or a specific length variant, contact our sales team.
Frequently Asked Questions
Can the 100G-PDAC-QSFP-SFP breakout cable run longer than 5 meters?
No. Passive copper breakout DACs are short-reach parts industry-wide, and this cable tops out at 5 meters using AWG26 wire gauge at that length. Shorter runs use AWG30 for 1 to 3.5 meters and AWG28 for 2 to 3 meters. For longer runs, an active optical cable or a transceiver-plus-fiber link is the usual alternative.
Why isn't my switch showing four independent 25G links from this breakout cable?
A 100G port that does not split into four 25G links usually means breakout or channelization mode is not enabled on that port. Verify that the target switch platform supports QSFP28-to-4xSFP28 breakout mode and check the port configuration guide for the specific commands, since breakout support and configuration syntax vary by platform and software release.
What should I check before ordering a breakout DAC cable like this one?
Confirm the target switch port supports QSFP28 breakout mode before ordering. Plan cable routing carefully, since a breakout cable is bulkier and less flexible near the QSFP28 end than four separate cables. Match the length to the rack layout, since passive copper DACs top out at 5 meters. Ordering the wrong port mode or an unsupported length is the most common mistake with breakout cables.