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QSFP28 Connector PinOut Guide

QSFP28 100G PinOut Guide

Posted at July 11, 2024 in by
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QSFP-MSA-Compliant-38-pin-Connector

Welcome to our QSFP28 100G PinOut guide! This resource is designed for network engineers, hardware designers, and anyone interested in understanding the intricacies of QSFP28 100G connectors. You’ll find into on the functionality and usage of each pin in the QSFP28 connector.

QSFP28 100G Pin Description Table

Below, we provide a detailed overview of each pin’s function in the QSFP28 100G connector:

Pin Name Description Logic Note
1 GND Ground 1
2 TX2n Transmitter Inverted Data Input CML-I
3 TX2p Transmitter Non-Inverted Data Output CML-I
4 GND Ground 1
5 TX4n Transmitter Inverted Data Input CML-I
6 TX4p Transmitter Non-Inverted Data Output CML-I
7 GND Ground 1
8 ModSelL Module Select LVTLL-I
9 ResetL Module Reset LVTLL-I
10 VccRX +3.3V Power Supply Receiver 2
11 SCL 2-Wire Serial Interface Clock LVCMOS-I/O
12 SDA 2-Wire Serial Interface Data LVCMOS-I/O
13 GND Ground 1
14 RX3p Receiver Non-Inverted Data Output CML-O
15 RX3n Receiver Inverted Data Output CML-O
16 GND Ground 1
17 RX1p Receiver Non-Inverted Data Output CML-O
18 RX1n Receiver Inverted Data Output CML-O
19 GND Ground 1
20 GND Ground 1
21 RX2n Receiver Inverted Data Output CML-O
22 RX2p Receiver Non-Inverted Data Output CML-O
23 GND Ground 1
24 RX4n Receiver Inverted Data Output CML-O 1
25 RX4p Receiver Non-Inverted Data Output CML-O
26 GND Ground 1
27 ModPrsL Module Present LVTTL-O
28 IntL Interrupt LVTTL-O
29 VccTX +3.3V Power Supply Transmitter 2
30 Vcc1 +3.3V Power Supply 2
31 LPMode Low Power Mode LVTTL-I
32 GND Ground 1
33 TX3p Transmitter Non-Inverted Data Input CML-I
34 TX3n Transmitter Inverted Data Output CML-I
35 GND Ground 1
36 TX1p Transmitter Non-Inverted Data Input CML-I
37 TX1n Transmitter Inverted Data Output CML-I
38 GND Ground 1

Notes:

  1. GND is the symbol for signal and supply (power) common for QSFP28 modules. 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 receiving and transmission power supplies and shall be applied concurrently. VccRX, Vcc1, and VccTX may be internally connected within the QSFP28 transceiver module in any combination. The connector pins are each rated for a maximum current of 1000 mA.

We hope this QSFP28 100G PinOut guide has enhanced your understanding of the QSFP28 pins. Whether you’re a network engineer or a hardware designer, this comprehensive breakdown will assist you in your projects and designs. Should you have any further questions or need additional resources, feel free to explore our other materials or contact our support team. We’re here to help with your network needs.