# 200G QSFP-DD-2xQSFP28 Direct Attach Cable (DAC)

QSFP-DD-2xQSFP28 passive copper cable assembly feature sixteen differential copper pairs, providing eight data transmission channels at speeds up to 25Gbps(NRZ) per channel, and meets 200G Ethernet and InfiniBand Enhanced Data Rate(EDR) requirements. Available in a broad range of wire gages from 28AWG through 30AWG, this 200G copper cable assembly features low insertion loss and low crosstalk.

![](https://cdn.shopify.com/s/files/1/0758/0362/3703/files/3_8c639993-e405-48e0-8479-cb993dcafd22.png?v=1786791822)

## **Features** **and Benefits**

l Compatible with IEEE 802.3bj

l Supports aggregate data rates of 200Gbps(NRZ)

l Optimized construction to minimize insertion loss and crosstalk

l Pull-to-release slide latch design

l Straight and break out assembly configurations available

l Customized cable braid termination limits EMI radiation   

l Customizable EEPROM mapping for cable signature

l 28AWG through30AWG cable

l 3.3V Power supply

l Temperature Range: 0~ 70 °C

l RoHS Compliant

## **Product** **Applications**

l Switches, servers and routers

l Data Center networks

l Storage area networks

l High performance computing

l Telecommunication and wireless infrastructure

l Medical diagnostics and networking

l Test and measurement equipment

## **Industry Standards**

l 200\_2x100G Ethernet(IEEE 802.3bj)

l InfiniBand EDR

## **Pin Descriptions**

QSFP-DD Pin Function Definition

**Pin**

**Logic**

**Symbol**

**Description**

1

GND

Ground

2

CML-I

Tx2n

Transmitter Inverted Data Input

3

CML-I

Tx2p

Transmitter Non-Inverted Data Input

4

GND

Ground

5

CML-I

Tx4n

Transmitter Inverted Data Input

6

CML-I

Tx4p

Transmitter Non-Inverted Data Input

7

GND

Ground

8

LVTTL-I

ModSelL

Module Select

9

LVTTL-I

ResetL

Module Reset

10

Vcc Rx

+3.3V Power Supply Receiver

11

LVCMOS- I/O

SCL

2-wire serial interface clock

12

LVCMOS- I/O

SDA

2-wire serial interface data

13

GND

Ground

14

CML-O

Rx3p

Receiver Non-Inverted Data Output

15

CML-O

Rx3n

Receiver Inverted Data Output

16

GND

Ground

17

CML-O

Rx1p

Receiver Non-Inverted Data Output

18

CML-O

Rx1n

Receiver Inverted Data Output

19

GND

Ground

20

GND

Ground

21

CML-O

Rx2n

Receiver Inverted Data Output

22

CML-O

Rx2p

Receiver Non-Inverted Data Output

23

GND

Ground

24

CML-O

Rx4n

Receiver Inverted Data Output

25

CML-O

Rx4p

Receiver Non-Inverted Data Output

26

GND

Ground

27

LVTTL-O

ModPrsL

Module Present

28

LVTTL-O

IntL

Interrupt

29

Vcc Tx

+3.3V Power supply transmitter

30

Vcc1

+3.3V Power supply

31

LVTTL-I

LPMode

Low Power Mode

32

GND

Ground

33

CML-I

Tx3p

Transmitter Non-Inverted Data Input

34

CML-I

Tx3n

Transmitter Inverted Data Input

35

GND

Ground

36

CML-I

Tx1p

Transmitter Non-Inverted Data Input

37

CML-I

Tx1n

Transmitter Inverted Data Input

38

GND

Ground

39

GND

Ground

40

CML-I

Tx6n

Transmitter Inverted Data Input

41

CML-I

Tx6p

Transmitter Non-Inverted Data Input

42

GND

Ground

43

CML-I

Tx8n

Transmitter Inverted Data Input

44

CML-I

Tx8p

Transmitter Non-Inverted Data Input

45

GND

Ground

46

Reserved

47

VS1

48

VccRx1

+3.3V Power supply

49

VS2

50

VS3

51

GND

Ground

52

CML-O

Rx7p

Receiver Non-Inverted Data Output

53

CML-O

Rx7n

Receiver Inverted Data Output

54

GND

Ground

55

CML-O

Rx5p

Receiver Non-Inverted Data Output

56

CML-O

Rx5n

Receiver Inverted Data Output

57

GND

Ground

58

GND

Ground

59

CML-O

Rx6n

Receiver Inverted Data Output

60

CML-O

Rx6p

Receiver Non-Inverted Data Output

61

GND

Ground

62

CML-O

Rx8n

Receiver Inverted Data Output

63

CML-O

Rx8p

Receiver Non-Inverted Data Output

64

GND

Ground

65

NC

66

Reserved

67

VccTx1

+3.3V Power supply

68

VCC2

+3.3V Power supply

69

Reserved

70

GND

Ground

71

CML-I

Tx7p

Transmitter Non-Inverted Data Input

72

CML-I

Tx7n

Transmitter Inverted Data Input

73

GND

Ground

74

CML-I

Tx5p

Transmitter Non-Inverted Data Input

75

CML-I

Tx5n

Transmitter Inverted Data Input

76

GND

Ground

 ![](https://cdn.shopify.com/s/files/1/0758/0362/3703/files/4_d647ae11-1276-4e04-82ca-483d5e517e81.png?v=1786792074)

QSFP28 Pin Function Definition

**Pin**

**Logic**

**Symbol**

**Description**

1

GND

Ground

2

CML-I

Tx2n

Transmitter Inverted Data Input

3

CML-I

Tx2p

Transmitter Non-Inverted Data Input

4

GND

Ground

5

CML-I

Tx4n

Transmitter Inverted Data Input

6

CML-I

Tx4p

Transmitter Non-Inverted Data Input

7

GND

Ground

8

LVTTL-I

ModSelL

Module Select

9

LVTTL-I

ResetL

Module Reset

10

Vcc Rx

+3.3V Power Supply Receiver

11

LVCMOS-

I/O

SCL

2-wire serial interface clock

12

LVCMOS-

I/O

SDA

2-wire serial interface data

13

GND

Ground

14

CML-O

Rx3p

Receiver Non-Inverted Data Output

15

CML-O

Rx3n

Receiver Inverted Data Output

16

GND

Ground

17

CML-O

Rx1p

Receiver Non-Inverted Data Output

18

CML-O

Rx1n

Receiver Inverted Data Output

19

GND

Ground

20

GND

Ground

21

CML-O

Rx2n

Receiver Inverted Data Output

22

CML-O

Rx2p

Receiver Non-Inverted Data Output

23

GND

Ground

24

CML-O

Rx4n

Receiver Inverted Data Output

25

CML-O

Rx4p

Receiver Non-Inverted Data Output

26

GND

Ground

27

LVTTL-O

ModPrsL

Module Present

28

LVTTL-O

IntL

Interrupt

29

Vcc Tx

+3.3V Power supply transmitter

30

Vcc1

+3.3V Power supply

31

LVTTL-I

LPMode

Low Power Mode

32

GND

Ground

33

CML-I

Tx3p

Transmitter Non-Inverted Data Input

34

CML-I

Tx3n

Transmitter Inverted Data Input

35

GND

Ground

36

CML-I

Tx1p

Transmitter Non-Inverted Data Input

37

CML-I

Tx1n

Transmitter Inverted Data Input

38

GND

Ground

 ![](https://cdn.shopify.com/s/files/1/0758/0362/3703/files/5_f255326c-28fc-4834-8ba3-60adfd0b4da8.png?v=1786792143)

**General** **Product** **Characteristics**

**QSFP-DD-****2****x****Q****SFP28 DAC** **Specifications**

Number of Lanes

Tx8 &Rx8(QSFP-DD)

Tx4 &Rx4(QSFP28)

Channel Data Rate

25.78125Gbps

Operating Temperature

0 to + 70°C

Storage Temperature

\-40 to + 85°C

Supply Voltage

3.3 V nominal

Electrical Interface

76pins edge connector(QSFP-DD)

38pins edge connector(QSFP28)

Management Interface

Serial, I2C

## **High Speed Characteristics**

Parameter

Symbol

Min

Typical

Max

Unit

Note

Differential Impedance

TDR

90

100

110

Ώ

Insertion loss

SDD21

\-22.48

dB

At 12.89GHz

Differential Return Loss

SDD11

SDD22

See 1

dB

At 0.05 to 4.1 GHz

See 2

dB

At 4.1 to 19 GHz

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

See 3

dB

At 0.01 to 12.89 GHz

See 4

At 12.89 to 19 GHz

Differential to common Mode

Conversion Loss

SCD21-IL

\-10

dB

At 0.01 to 12.89 GHz

See 5

At 12.89 to 15.7 GHz

\-6.3

At 15.7 to 19 GHz

Notes:

1. Reflection Coefficient given by equation SDD11(dB) < \-16.5 + 2 × SQRT(f ), with f in GHz

2. Reflection Coefficient given by equation SDD11(dB) < \-10.66 + 14 × log10(f/5.5), with f in GHz

3. Reflection Coefficient given by equation SCD11(dB) < \-22 + (20/25.78)\*f, with f in GHz

4. Reflection Coefficient given by equation SCD11(dB) < \-15 + (6/25.78)\*f, with f in GHz

5. Reflection Coefficient given by equation SCD21(dB) < \-27 + (29/22)\*f, with f in GHz

**Mechanical** **Specifications**

The connector is compatible with the QSFP-DD and SFF-8436 specification.

 ![](https://cdn.shopify.com/s/files/1/0758/0362/3703/files/6_ddb667ce-42e5-445c-91cb-f7486e90d1e2.png?v=1786792262)

Length (m)

Cable AWG

1

     30

2

    30

3

    30

5

    26

## **Regulatory** **Compliance**

**Feature**

**Test** **Method**

**Performance**

Electrostatic Discharge (ESD) to the Electrical Pins

MIL-STD-883C Method 3015.7

Class 1(>2000 Volts)

Electromagnetic Interference(EMI)

FCC Class B

Compliant with Standards

CENELEC EN55022 Class B

CISPR22 ITE Class B

RF Immunity(RFI)

IEC61000-4-3

Typically Show no Measurable Effect from a 10V/m Field Swept from 80 to 1000MHz

RoHS Compliance

RoHS Directive 2011/65/EU and it's Amendment Directives （EU） 2015/863

RoHS （EU）2015/863 compliant

REACH Compliance

REACH  Regulation (EC) No 1907/2006

REACH (EC) No 1907/2006 compliant

## Details

- **Price:** 0.0 USD
- **Vendor:** DFT TELECOM
- **Type:** 通信
- **Tags:** 200G, 400G, 800G, Datacenter, dfttelecom, Nvidia, optic module

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 0.00 USD | In stock |

## Images

- 200G QSFP-DD-2xQSFP28 Direct Attach Cable (DAC)

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> Source: [DFT TELECOM ](https://dfttelecom.com/products/200g-qsfp-dd-2xqsfp28-direct-attach-cable-dac)
> Updated: 2026-08-15