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Cisco QSFP-40G-SR4 Compatible 40GBASE-SR4 QSFP+ 850nm 150M DDM MTP/MPO MMF Optical Transceiver Module

Product No: 28646
117 Reviews
11.1K Sold
US$ 25.00  US$ 33.90
1132 in real-time stock, 10 Jun, 2026

Free Shipping over US$ 79.8

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Providing industry-leading limited lifetime warranty.
Please check our warranty policy for details.
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Exchanges caused by the customer's reasons will not be accepted.
Please ensure that the item you're returning is repackaged with all the cords, adapters, and documentation included when you receive it.
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1. MTP/MPO-12 Male Connector
2. Low Pwer Consumption <0.7W
3. For Data Center, Campus Network, 40G to 10G Break-out
4. Compatible with 100+ Vendors
5. Hot Pluggable SFF 8436 MSA Compliant		
See more

Specifications

Cisco QSFP-40G-SR4 Compatible 40GBASE-SR4 QSFP+ Optical Transceiver Module (MMF, 850nm, 150m, MTP/MPO, DDM)

 

The Cisco QSFP-40G-SR4-S compatible 40G QSFP+ transceiver module is equipped with an MTP-12 male fiber connector, reaching a link up to 150m over laser-optimized OM4 multimode fiber (100m over OM3 MMF). It is verified to interoperate with original Cisco switches, including the Catalyst 9400/9500/9600/9800 and Nexus 9300/9500/9800/6000/7000 series, etc. It also supports breakout to 4x 10GBASE-SR SFP+ via MTP/MPO-8 to 4x LC duplex OM3/OM4 breakout cables. This 40G optical transceiver comes with a bidirectional 4-channel QSFP+ connector, enabling a total 40Gbps bandwidth by each channel carrying a 10 Gbps data rate. DOM/DDM (digital diagnostics monitoring) function is supported on the QSFP 40G fiber transceiver to achieve real-time operating parameters monitoring.

 

QSFPTEK manufactured 40GBASE-SR4 QSFP+ module is compliant with QSFP+ MSA (SFF-8436) and IEEE 802.3ba 40GBASE-SR4 specifications. Besides, the quad small form-factor pluggable (QSFP) SR4 optic has been tested on host devices to ensure full compatibility with Cisco equipment, such as data center switches, enterprise routers, and server network interface cards (NICs). The third-party 40G SFP module is an ideal substitute to the Cisco QSFP-40G-SR4-S QSFP+ 40G transceiver at an affordable price, providing a cost-effective compatible solution for high-performance 40G connectivity.

  

Model Name QSFP-40G-SR4 Vendor Name QSFPTEK
Form Factor QSFP+ Data Rate 40 Gbps
Wavelength 850nm Distance 150m@OM4/100m@OM3
Connector MTP/MTO-12 Male Cable Type OM4/OM3 MMF
Transmitter Type VCSEL Receiver Type PIN
TX Power -7~1dBm Receiver Sensitivity <-9.5dBm
Power Consumption <0.7W Modulation Format NRZ
DDM Support Bit Error Ratio (BER) 1E-12
Protocols IEEE 802.3ba, QSFP+ MSA, SFF-8436, Infiniband 40G QDR Warranty 5 Years
Quality Testing Program
Quality Certifications

Features

  • 1. High Reliablility and Best Price
    Proudly self-producing and rigorous testing, QSFPTEK is dedicated to delivering cost-effective products with high reliability and performance at trade price.
  • 2. Wide Application Scenarios
    Fully compatible with almost all Cisco devices. Ideal for data centers, campus networks, metro networks, etc.
  • 3. Protocols
    Compliant with IEEE 802.3ba, QSFP+ MSA, SFF-8436, SFF-8636.
  • 4. Quality Certifications
    Backed by CE, FCC, ROSH, ISO9001.

Applications

Scenario 1: 40G to 40G Direct Connectivity

40GBASE-SR4 40G to 40G Direct Connectivity

 


    

Scenario 2: 40G to 10G Breakout Connectivity

40GBASE-SR4 40G to 10G Breakout Connectivity

      


  

Scenario 3: 40GBASE-SR4 Connectivity with NIC

40GBASE-SR4 Connectivity with NIC

 

Product details

Seamlessly Achieve 10G to 40G Migration

  

Upgrade the Spine to 40G gear while maintaining the 10G Leaf architecture, achieving seamless 10G to 40G migration.

 

 


Various Switch Tests

 

Every module is quality tested for compatibility in the multi-brand switches environment, which guarantees flawless operations.

 

 


 

Tested in The Host Device to Prove Interoperability

 

Every unit sold undergoes rigorous quality testing, to ensure compatibility in the target switch environment, guaranteeing perfect operation.

 

QSFPTEK Test Rack

 


 

Various Switch Tests

 

Every module is qualified through rigorous procedures and advanced equipment to ensure high-quality and reliable optical devices for you.

 

QSFPTEK Test Devices

 


 

40G QSFP+ Model Contrast Table

 

Part Number

QT-QSFP+-SR4

QT-QSFP+-IR4

QT-QSFP+-PSM4

QT-QSFP+-LR4

QT-QSFP+-LR4-20

QT-QSFP+-ER4

QT-QSFP+-ZR4

Image

Wavelength

850nm

CWDM

1310nm

CWDM

CWDM

CWDM

LWDM 1294~1310nm

Max Distance

150m

2km

10km

10km

20km

40km

80km

Cable Type

OM3/OM4 MMF

OS2 SMF

OS2 SMF

OS2 SMF

OS2 SMF

OS2 SMF

OS2 SMF

Connector

MPO/MTP-12

LC Duplex

MPO/MTP-12

LC Duplex

LC Duplex

LC Duplex

LC Duplex

Tx Power(dBm)

-7 ~ 1

-7 ~ 2.3

-6 ~ -1

-7 ~ 2.3

-4 ~ 2.3

-2.7 ~ 4.5

-2.7 ~ 4.5

Rx Sensitivity(dBm)

-9.5

-11.5

-14.4

-13.7

-11.5

-19

-28

Power Consumption

<0.7W

<2.5W

<2.5W

< 2.5W

<3.5W

<3.5W

<5W

Source

VCSEL + PIN

DFB + PIN

4xDFB + PIN

DFB + PIN

DFB + PIN

DFB + PIN

4xDFB + APD

Operating Temperature

0 to 70°C

0 to 70°C

0 to 70°C

0 to 70°C

0 to 70°C

0 to 70°C

0 to 70°C

Questions & Answers

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Customer Reviews

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  • Fast Delivery (10)
  • Compatibility (15)
  • Toby United States of America
    2026-02-06

    We've been running these 40G SR4 optics in our core for months. Setup was straightforward, and performance has been consistent under traffic. Works as expected with our MPO cabling.

    Transceivers typeQSFP-40G-SR4

    CompatibleCisco

    Verified Purchase

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  • Timothy United States of America
    2026-01-30

    Been running this 40G SR4 for a few weeks now and it's been rock solid. Signal is clean, no drops. Shipping was quicker than expected, packaging was well done, and support actually replied with useful answers.

    Transceivers typeQSFP-40G-SR4

    CompatibleCisco

    Verified Purchase

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    0

  • Sid United States of America
    2025-12-26

    This 40G SR4 has been a solid replacement for some older optics in our 40G environment. Works well over our existing OM4 fiber and had no compatibility issues with our switches. A dependable option for keeping legacy 40G links running smoothly.

    Transceivers typeQSFP-40G-SR4

    CompatibleCisco

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  • Viv United States of America
    2025-12-18

    We're still running some 40G gear and this SR4 fit right in. Plugged it into our OM4 cabling and the link came up immediately. Been running nonstop and hasn't given us any trouble.

    Transceivers typeQSFP-40G-SR4

    CompatibleCisco

    Verified Purchase

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    0

  • Terry United States of America
    2025-12-05

    The 40G SR4s used for internal aggregation layer interconnection in the data center performed reliably. With high-density MPO cabling, the links established instantly, exhibiting low latency and reasonable power consumption. They offer good value for money and are suitable for upgrade scenarios where major cabling changes are not desired.

    Transceivers typeQSFP-40G-SR4

    CompatibleCisco

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  • Carlton United States of America
    2025-11-27

    Been using this 40G SR4 for a few weeks in my lab setup here, and it's been super solid. Fast links, no dropouts, and it runs cooler than I expected. Definitely a reliable pick for short-range 40G connections.

    Transceivers typeQSFP-40G-SR4

    CompatibleCisco

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  • Dean United States of America
    2025-10-24

    This 40G SR4 module is recognized immediately upon insertion and offers stable performance. Shipping was fast, and the account manager processed my order immediately after placing it, which was very timely.

    Transceivers typeQSFP-40G-SR4

    CompatibleCisco

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  • Morgan Arthur United States of America
    2025-10-11

    We installed 40GBASE-SR4 modules for short-distance connections in our data center. These modules are easy to configure, plug-and-play, and reliably transmit 40G speeds over multimode fiber. Even under heavy loads, the modules maintain excellent temperature control and signal quality. While slightly pricier, their reliability is well worth the investment.

    Transceivers typeQSFP-40G-SR4

    CompatibleCisco

    Verified Purchase

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  • Isaac United States of America
    2025-02-21

    Will choose QSFPTEK next time, their professional service, good enough price and good quality products, that's the reason.

    Transceivers typeQSFP-40G-SR4

    CompatibleCisco

    Verified Purchase

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    0

  • Burke Nick United States of America
    2025-01-17

    I've been using the 40G optical modules for a few months now in a busy data center, and they've been working like a charm. The speed is steady, and we've seen a big boost in data transfer rates compared to the old equipment. Setting them up was a breeze, and they fit right in with the infrastructure we already had.

    Transceivers typeQSFP-40G-SR4

    CompatibleCisco

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Video

Resources

  • PDF Document
    QT-QSFP+-SR4 150M Datasheet.pdf
  • PDF Document
    Transceiver Module User Guide.pdf
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Cisco QSFP-40G-SR4 Compatible 40GBASE-SR4 QSFP+ 850nm 150M DDM MTP/MPO MMF Optical Transceiver Module

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Mark

2023-12-15
This product works well with my switch, and I plan to buy some DWDM transceivers from QT. Excellent value fo ct works well with my switch, and I plan to buy some DWDM transceivers from QT. Excellent valur money!

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Cisco QSFP-40G-SR4 Compatible 40GBASE-SR4 QSFP+ 850nm 150M DDM MTP/MPO MMF Optical Transceiver Module
US$ 33.90
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