100G QSFP28 to 4×25G SFP28 Passive Direct Attach Copper Twinax Cable (DAC)

Compliant with IEEE 802.3、SFF-8665、SFF-8636、QSFP28 MSA standard
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SPECIFICATIONS
Cable End Connector AQSFP28Cable End Connector B4×SFP28
Jumper TypeDirect-Attach BreakoutData Rate100G
Aggregate Bit Rate103.125GbpsLane Bit Rate25.78125Gbps
Number of Channels4Single Channel Rate25G
Minimum Bend Radius5X Cable OD -Single, 10X Cable OD - RepeatedFactory BrandPHILISUN
Attenuation26AWG:10dB/8.5m maximum
30AWG:8.4dB/5.5m maximum		Bit Error Rate≤10-12
ShieldBraid/FoilWire AWG26AWG/30AWG
Cable TypePassive TwinaxCable OD30AWG: 12.0mm
26AWG: 14.0mm
Cable Colour/MaterialBlack PVC(OFNR)Cable Length Selection0.5-5 meter
ProtocolsIEEE 802.3bj/QSFP28 MSA/100GEBASE-CR4 /SFP28 MSA/SFF-8402/SFF-8432/SFF-8665Application Scenarios100 to 4x25Gigabit Ethernet (100GbE)
Supply Voltage3.3VPower Dissipation<0.125W
Operating Temperature0 to 70℃ (32 to 158℉)Storage Temperature-40 to 85℃ (-40 to 185℉)

 

PRODUCT PRESENTATION
The PHILISUN 100G QSFP28 to 4x25G SFP28 Passive Direct Attach Copper Twinax Cable (DAC) is an essential Breakout Cable solution, segmenting a single 100G port into four 25G SFP28 links. This Passive Copper DAC Cable is compliant with the IEEE 802.3, SFF-8665, SFF-8636, and QSFP29 MSA standard, ensuring wide compatibility for Server Interconnects. It delivers Ultra-Low Latency and is highly Cost-Effective for maximizing port density in Data Center racks, supporting scalable Switch to Switch connections and high-throughput paths from Switch to GPU systems.

 

DAC SERIES PRODUCTS

 

PRODUCTION & TESTING EQUIPMENT

 

PERFORMANCE PARAMETER
Absolute Maximum Ratings
Parameter Min. Max. Unit
Supply voltage -0.3 3.6 V
Data input voltage -0.3 3.6 V
Control input voltage -0.3 3.6 V

 

Recommended Operating Environment
Parameter Symbol Min. Typ. Max. Unit
Caseoperating Temperature TC 0 – +70 ℃
Supply Voltage VCCT, R +3.13 3.3 +3.47 V
Power Dissipation PD – – 0.1 W
Operating relative humidity – 5 – 85 %

 

Electrical Characteristics
Parameter Min. Typ. Max. Unit
Characteristic impedance 90 100 110 Ω
Time delay – – 4.5 ns/m
Time delay skew (in the same pair) – – 10 ps
Time delay skew (pair to pair) – – 50 ps

 

High Speed Characteristics
Parameter Symbol Min Typ. Max Unit Note
Differential Impedance RIN, P-P 90 100 110 Ώ –
Insertion loss SDD21 8 – 22.48 dB At 12.8906 GHz
Differential Return Loss SDD11 SDD22 12.45 – See 1 dB At 0.05 to 4.1 GHz
3.12 – See 2 dB At 4.1 to 19 GHz
Common-mode tocommon mode output return loss SCC11 SCC22 2 – – dB At 0.2 to 19 GHz
Differential to common-mode
return loss		 SCD11
SCD22		 12 – See 3 dB At 0.01 to 12.89
10.58 – See 4 At 12.89 to 19 GHz
Differential to common Mode
Conversion Loss		 SCD21-IL 10 – See 5 dB At 0.01 to 12.89
– – At 12.89 to 15.7
6.3 – At 15.7 to 19 GHz
Channel Operating Margin COM 3 – – dB –
Notes:
1.Reflection Coefficient given by equation SDD11(dB) < 16.5 – 2×SQRT(f ), with finGHz
2.Reflection Coefficient given by equation SDD11(dB) < 10.66 – 14×log10(f/5.5), with finGHz
3.Reflection Coefficient given by equation SCD11(dB) < 22 – (20/25.78)*f, with finGHz
4.Reflection Coefficient given by equation SCD11(dB) < 15 – (6/25.78)*f, with finGHz
5.Reflection Coefficient given by equation SCD21(dB) < 27 – (29/22)*f, with finGHz

 

QSFP28 Module Pad Layout

 

PIN Logic Symbol Name/Description Note
1 GND GND Ground 1
2 CML-I Tx2n Transmitter Inverted Data –
3 CML-I Tx2p Transmitter Non-Inverted –
4 – GND Ground 1
5 CML-I Tx4n Transmitter Inverted Data –
6 CML-I Tx4p Transmitter Non-Inverted –
7 – GND Ground 1
8 LVTTL-I ModSelL Module  Select –
9 LVTTL-I ResetL   Module Reset –
10 – Vcc Rx +3.3V Power Supply 2
11 LVCMOSI/O SCL 2-wire serial interface –
12 LVCMOSI/O SDA 2-wire serial interface data –
13 – GND Ground 1
14 CML-O Rx3p Receiver Non-Inverted –
15 CML-O Rx3n Receiver Inverted Data –
16 – GND Ground 1
17 CML-O Rx1p Receiver Non-Inverted Data –
18 CML-O Rx1n Receiver Inverted Data –
19 – GND Ground 1
20 – GND Ground 1
21 CML-O Rx2n Receiver Inverted Data –
22 CML-O Rx2p Receiver Non-Inverted Data –
23 – GND Ground 1
24 CML-O Rx4n Receiver Inverted Data –
25 CML-O Rx4p Receiver Non-Inverted Data –
26 – GND Ground 1
27 LVTTL-O ModPrsL Module  Present –
28 LVTTL-O IntL Interrupt –
29 – Vcc Tx +3.3V Power supply 2
30 – Vcc1 +3.3V Power supply 2
31 LVTTL-I LPMode Low Power Mode –
32 – GND Ground 1
33 CML-I Tx3p Transmitter Non-Inverted –
34 CML-I Tx3n Transmitter Inverted Data –
35 – GND Ground 1
36 CML-I Tx1p Transmitter Non-Inverted –
37 CML-I Tx1n Transmitter Inverted Data –
38 Tx1p GND Ground 1
Notes:
1.GND is the symbol for signal and supply (power) common for the QSFP28 module. All are common within the QSFP28 module and all module voltages are referenced to this potential unless otherwise noted. Connect these directly to the host board signal-common ground plane.
2.VccRx, Vcc1 and VccTx are the receiver and transmitter power supplies and shall be applied concurrently. Requirements defined for the host side of the Host Edge Card Connector are listed in Table 6. Recommended host board power supply filtering is shown in Figure4. VccRx, Vcc1 and VccTx may be internally connected within the QSFP28 Module module in any combination. The connector pins are each rated for a maximum current of 500mA.

 

SFP28 Pin Descriptions

 

PIN Logic Symbol Name/Description Note
1 – VeeT Transmitter Ground –
2 LV-TTL-O TX_Fault N/A 1
3 LV-TTL-I TX_DIS Transmitter Disable 2
4 LV-TTL-I/O SDA Tow Wire Serial Data –
5 LV-TTL-I SCL Tow Wire Serial Clock –
6 – MOD_DEF0 Module present, connect –
7 LV-TTL-I RS0 N/A 1
8 LV-TTL-O LOS LOS of Signal 2
9 LV-TTL-I RS1 N/A 1
10 – VeeR Reciever Ground –
11 – VeeR Reciever Ground –
12 CML-O – Reciever Data Inverted –
13 CML-O RD+ Reciever Data –
14 – VeeR Reciever Ground –
15 – VccR Reciever Supply 3.3V –
16 – VccT Transmitter Supply 3.3V –
17 – VeeT Transmitter Ground –
18 CML-I TD+ Transmitter Data –
Notes:
1.Signals not supported in SFP28 Copper pulled-downto VeeT with 30K ohms resistor.
2.Passive cable assemblies do not support LOS and TX_DIS.

 

PRODUCT CERTIFICATION

 

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