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DAC (Direct Attach Cable)/


Compliant with SFF-8431, 8432 and 8472.

Up to 10.3125Gbps data rate per channel

Up to 7m transmission

Single 3.3V power supply

Temperature Range: 0~ 70 °C

RoHS compliant

  • Product Detail
  • Applications
  • Pin definition
  • Mechanical Dimensions

SFP+ Direct Attach Cables are compliant with the SFF-8431, SFF-8432 and SFF-8472 specifications. Various choices of wire gauge are available from 30 to 24 AWG with various choices of cable length (up to 7m).

Specifications of 10G SFP+ Direct Attach Cable

General Product Characteristics

QSFP+ DAC Specifications
Number of LanesTx & Rx
Channel Data Rate10.3125 Gbps
Operating Temperature0 to + 70°C
Storage Temperature-40 to + 85°C
Supply Voltage3.3 V nominal
Electrical Interface38 pins edge connector
Management InterfaceSerial, I2C

High Speed Characteristics

Differential ImpedanceZd90100110Ω
Differential Input Return LossSDDXX<-12+2* SQRT (f) with f in GHzdB0.01~4.1GHz
<-6.3+13*Log10/(f/5.5) with f in GHzdB4.1~11.1GHz
Common Mode Output Return LossSCCXX< -7+1.6*f with f in GHzdB0.01~2.5GHz
Difference Waveform Distortion PenaltydWDPc6.75dB
VMA LossL4.4dB
VMA Loss to Crosstalk RatioVCR32.5dB

Regulatory Compliance

FeaturesTest MethodPerformance
Electrostatic Discharge (ESD) to the Electrical PinsMIL-STD-883C Method 3015.7Class 1(>2000 Volts)
Electromagnetic Interference(EMI)FCC Class BCompliant with Standards
CENELEC EN55022 Class B
RF Immunity(RFI)IEC61000-4-3Typically Show no Measurable Effect from a 10V/m Field Swept from 80 to 1000MHz
RoHS ComplianceRoHS Directive 2011/65/EU and it’s Amendment Directives 6/6RoHS 6/6 compliant
  • Low EMI radiation Switches, servers and routers
  • Data Center networks
  • Storage area networks
  • High performance computing
  • Telecommunication and wireless infrastructure
  • Medical diagnostics and networking
  • Test and measurement equipment
  • Recommended Operation Condition of 10G SFP+ Direct Attach Cable

    Operating Case TemperatureTopc070degC
    Storage TemperatureTst-4085degC
    Relative Humidity (non-condensation)RS3560%
    Supply VoltageVCC33.1353.465V
    Voltage on LVTTL InputVilvttl-0.3VCC3  +0.2V
    Power Supply CurrentICC315mA
    Total Power ConsumptionPd0.05W

    Notes: Stress or conditions exceed the above range may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not applied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Pin definition of 10G SFP+ Direct Attach Cable

1VEET [1]Transmitter Ground
2Tx_FAULT [2]Not used
3Tx_DIS [3]Not used
4SDA [2]2-wire Serial Interface Data Line
5SCL [2]2-wire Serial Interface Clock Line
6MOD_ABS [4]Module Absent. Grounded within the module
7RS0 [5]Not used
8RX_LOS [2]Loss of Signal indication. Logic 0 indicates normal operation
9RS1 [5]Not used
10VEER [1]Receiver Ground
11VEER [1]Receiver Ground
12RD-Receiver Inverted DATA out. AC Coupled
13RD+Receiver DATA out. AC Coupled
14VEER [1]Receiver Ground
15VCCRReceiver Power Supply
16VCCTTransmitter Power Supply
17VEET [1]Transmitter Ground
18TD+Transmitter DATA in. AC Coupled
19TD-Transmitter Inverted DATA in. AC Coupled
20VEET [1]Transmitter Ground

Notes: 1. Module circuit ground is isolated from module chassis ground within the module. 2..should be pulled up with 4.7k – 10k ohms on host board to a voltage between 3.15Vand 3.6V. 3.Tx_Disable is an input contact with a 4.7 kΩ to 10 kΩ pullup to VccT inside the module. 4.Mod_ABS is connected to VeeT or VeeR in the SFP+ module. The host may pull this contact up to Vcc_Host with a resistor in the range 4.7 kΩ to10 kΩ.Mod_ABS is asserted “High” when the SFP+ module is physically absent from a host slot. 5. RS0 and RS1 are module inputs and are pulled low to VeeT with > 30 kΩ resistors in the module.

The connector is compatible with the SFF-8432 specification.

Length (m)Cable AWG



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