100G QSFP28 DAC Cables – www.philisun.com https://www.philisun.com Optical transceivers support <strong>10G to 800G</strong> high-speed transmission Thu, 12 Mar 2026 06:36:12 +0000 en-US hourly 1 https://www.philisun.com/wp-content/uploads/2025/10/philisun斐立飒-logo彩色方形-1-100x100.png 100G QSFP28 DAC Cables – www.philisun.com https://www.philisun.com 32 32 100G QSFP28 to 4×25G SFP28 Passive Direct Attach Copper Twinax Cable (DAC) https://www.philisun.com/products/100g-qsfp28-4-25g-sfp28-dac/ Thu, 12 Mar 2026 06:20:08 +0000 https://www.philisun.com/?post_type=product&p=7556 Compliant with IEEE 802.3、SFF-8665、SFF-8636、QSFP28 MSA standard
Switch to Switch
Switch to GPU

100G QSFP28 to 4×25G SFP28 Passive Direct Attach Copper Twinax Cable (DAC)最先出现在www.philisun.com。

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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

 

COMPATIBLE BRANDS
CONFIGURATION INFORMATION
The form can be filled in the actual website url.

 

100G QSFP28 to 4×25G SFP28 Passive Direct Attach Copper Twinax Cable (DAC)最先出现在www.philisun.com。

]]> 100G QSFP28 to 2×50G QSFP28 Passive Direct Attach Copper Twinax Cable (DAC) https://www.philisun.com/products/100g-qsfp28-2-50g-qsfp28-dac/ Thu, 12 Mar 2026 05:16:35 +0000 https://www.philisun.com/?post_type=product&p=7547 Compliant with IEEE 802.3、SFF-8665、SFF-8636、QSFP28 MSA standard
Switch to Switch
Switch to GPU

100G QSFP28 to 2×50G QSFP28 Passive Direct Attach Copper Twinax Cable (DAC)最先出现在www.philisun.com。

]]>
SPECIFICATIONS
Cable End Connector AQSFP28Cable End Connector B2×QSFP28
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: 5.9mm
26AWG: 6.3mm
Cable Colour/MaterialBlack PVC(OFNR)Cable Length Selection0.5-5 meter
ProtocolsIEEE 802.3bj/SFF-8665/SFF-8679/ SFF-8636/ SFF-8661/QSFP28 MSAApplication Scenarios100 to 2x50Gigabit Ethernet (100GbE)
128G Fibre Channel
Supply Voltage3.3VPower Dissipation<0.5W
Operating Temperature0 to 70℃ (32 to 158℉)Storage Temperature-40 to 85℃ (-40 to 185℉)

 

PRODUCT PRESENTATION
The PHILISUN 100G QSFP28 to 2x50G QSFP28 Passive Direct Attach Copper Twinax Cable (DAC) is a flexible Breakout Cable solution, converting a single 100G port into two independent 50G QSFP28 links. This Passive Copper DAC Cable is crucial for maximizing port density in Data Center racks. It delivers Low Latency and is highly Cost-Effective, compliant with the IEEE 802.3, SFF-8665, SFF-8636, and QSFP28 MSA Standard. It is ideal for scalable Switch to Switch aggregation and connections from Switch to GPU to lower-speed servers.

 

DAC SERIES PRODUCTS

 

PRODUCTION & TESTING EQUIPMENT

 

PERFORMANCE PARAMETER
General Product Characteristics
Compliance Standard IEEE 802.3bj/SFF-8665/SFF-8679/ SFF-8636/ SFF-8661
Number of Lanes 4 Tx & 4 Rx
Channel Data Rate 25.78125 Gbps/channe
Operating Case Temperature 0 to + 70°C
Storage Temperature -40 to + 85°C
Supply Voltage 3.3V nominal
Electrical Interface 38-pin edge connector
Management Interface Serial, 12C

 

Pin Function Definition

 

PIN Logic Symbol Description Plug Sequence Note
1 – GND Ground 1 1
2 CML-I Tx2n Transmitter Inverted Data Input 3 –
3 CML-I Tx2p Transmitter Non-inverted Data Input 3 –
4 – GND Ground 1 1
5 CML-I Tx4n Transmitter Inverted Data Input 3 –
6 CML-I Tx4p Transmitter Non-inverted Data Input 3 –
7 – GND Ground 1 1
8 LVTTL-I ModSeIL Module Select 3 –
9 LVTTL-I ResetL Module Reset 3 –
10 – VccRx +3.3V Power Supply Receiver 2 –
11 LVCMOS-I/O SCL 2-Wire Serial Interface Clock 3 2
12 LVCMOS-I/O SDA 2-Wire Serial Interface Data 3 2
13 – GND Ground 1 1
14 CML-O Rx3p Receiver Non-Inverted Data Output 3 –
15 CML-O Rx3n Receiver Inverted Data Output 3 –
16 – GND Ground 1 1
17 CML-O Rx1p Receiver Non-Inverted Data Output 3 –
18 CML-O Rx1n Receiver Inverted Data Output 3 –
19 – GND Ground 1 1
20 – GND Ground 1 1
21 CML-O Rx2n Receiver Inverted Data Output 3 –
22 CML-O Rx2p Receiver Non-Inverted Data Output 3 –
23 – GND Ground 1 1
24 CML-O Rx4n Receiver Inverted Data Output 3 –
25 CML-O Rx4p Receiver Non-Inverted Data Output 3 –
26 – GND Ground 1 1
27 LVTTL-O ModPrsL Module Present 3 2
28 LVTTL-O IntL Interrupt 3 2
29 – VccTx +3.3V Power Supply Transmitter 2 –
30 – Vcc1 +3.3V Power Supply 2 –
31 LVTTL-1 LPMode Low Power Mode 3 –
32 – GND Ground 1 1
33 CML-I Tx3p Transmitter Non-Inverted Data Input 3 –
34 CML-I Tx3n Transmitter Inverted Data Input 3 –
35 – GND Ground 1 1
36 CML-I Tx1p Transmitter Non-Inverted Data Input 3 –
37 CML-I Tx1n Transmitter Inverted Data Input 3 –
38 – GND Ground 1 1
Notes:
1,GND is the symbol for signal and supply (power) common for QSFP modules. All are common within the QSFP module and all modulevoltages 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 suppliers and shall be applied concurrently. Recommended host board power supply filtering is shown below. Vcc Rx, Vcc1 and Vcc Tx may be internally connected within the QSFP transceiver module in any combination. The connector pins are each rated for a maximum current of 1000mA.

 

PRODUCT CERTIFICATION

 

COMPATIBLE BRANDS
CONFIGURATION INFORMATION
The form can be filled in the actual website url.

 

100G QSFP28 to 2×50G QSFP28 Passive Direct Attach Copper Twinax Cable (DAC)最先出现在www.philisun.com。

]]> 100G QSFP28 to QSFP28 Passive Direct Attach Copper Twinax Cable (DAC) https://www.philisun.com/products/qsfp28-100g-dac/ Wed, 11 Mar 2026 09:28:06 +0000 https://www.philisun.com/?post_type=product&p=7512 Compliant with IEEE 802.3、SFF-8662、QSFP28 MSA standard
Switch to Switch
Switch to GPU

100G QSFP28 to QSFP28 Passive Direct Attach Copper Twinax Cable (DAC)最先出现在www.philisun.com。

]]>
SPECIFICATIONS
Cable End Connector AQSFP28Cable End Connector BQSFP28
Jumper TypeDirect-AttachData Rate100G
Aggregate Bit Rate103.12GbpsLane Bit Rate25.78Gbps
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: 6.6mm
26AWG: 8.4mm
Cable Colour/MaterialBlack PVC(OFNR)Cable Length Selection0.5-5 meter
ProtocolsSFF-8665/IEEE 802.3/QSFP28 MSA/QSFP28 MSA/SFF-8436Application Scenarios100Gigabit Ethernet (100GbE)
Supply Voltage3.3VPower Dissipation<0.5W
Operating Temperature0 to 70℃ (32 to 158℉)Storage Temperature-40 to 85℃ (-40 to 185℉)

 

PRODUCT PRESENTATION
The PHILISUN 100G QSFP28 to QSFP28 Passive Direct Attach Copper Twinax Cable (DAC) provides a high-speed, point-to-point link, offering the best in-rack connectivity for modern Data Center and HPC environments. Utilizing Passive Copper technology, it ensures Ultra-Low Latency and zero power consumption, making it highly Cost-Effective. The cable is fully compliant with the IEEE 802.3, SFF-8662, and QSFP28 MSA Standard, supporting direct links from Switch to Switch and high-throughput Server Interconnect paths to Switch to GPU systems.

 

DAC SERIES PRODUCTS

 

PRODUCTION & TESTING EQUIPMENT

 

PERFORMANCE PARAMETER
Absolute Maximum Ratings
Parameter Symbol Min. Typ. Max. Unit
Operating Case Temperature – -40 – +85 ℃
Relative Humidity Tc 0 – +70 ℃
Supply Voltage VCC3 3 3.3 3.47 V
Data Rate Per Lane – 1 – 25.78 Gb/s

 

High Speed Characteristics
Parameter Symbol Min. Typ. Max. Unit Note
Differential Impedance RIN, P 9 100 110 Ώ –
Insertion loss SDD2 8 – 22.48 dB At 12.8906
Differential Return Loss SDD11
SDD22		 12.45 – See 1 dB At 0.05 to
3.12 – See 2 At 4.1 to 19
Common-mode to   common 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
10.58 – See 4 At 12.89 to
Differential to common Mode Conversion Loss SCD21-IL 10 – – dB At 0.01 to
– – See 5 At 4.1 to 19
6.3 – – At 15.7 to
Channel Operating Margin COM 3 – – dB –
Notes:
1. Reflection Coefficient given by equation SDD11(d B) < 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(d B) < 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.

 

Pin Definition

 

PIN Logic Symbol Name/Description Note
1 – 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 ModSel Module Select –
9 LVTTL-I ResetL Module  Reset –
10 – Vcc Rx +3.3V Power Supply 2
11 LVCMOS SCL 2-wire serial interface –
12 LVCMOS SDA 2-wire serial interface –
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 –
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 –
23 – GND Ground 1
24 CML-O Rx4n Receiver Inverted Data –
25 CML-O Rx4p Receiver Non-Inverted –
26 – GND Ground 1
27 LVTTL-O ModPrs 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 – GND Ground 1
Notes:
1. GND is the symbol for signal and supply (power) common for the QSFP+ module. All are common within the QSFP+ module and all module voltages are referenced to this potential unless otherwise noted. Connect these directly to the hostboard signal-common ground plane.
2. Vcc Rx, Vcc1 and Vcc Tx 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 filter ing is shown in Figure 4. Vcc Rx Vcc1 and  Vcc Tx may  be internally  connected within the QSFP+ Module module in any combination. The connector pins are each rated for a maximum current of 500 mA.

 

PRODUCT CERTIFICATION

 

COMPATIBLE BRANDS
CONFIGURATION INFORMATION
The form can be filled in the actual website url.

 

100G QSFP28 to QSFP28 Passive Direct Attach Copper Twinax Cable (DAC)最先出现在www.philisun.com。

]]>