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    Home / Products / Transceivers / 25G/40G Transceivers / 40G QSFP+ / 28646

    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
    Compatible
    Transceivers type
    1132 in real-time stock, 10 Jun, 2026

    Free Shipping over US$ 79.8

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    Please check our warranty policy for details.
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    Add to Cart Bulk Order Quotes 
    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
    Optical Transceivers Testing

    Take a look at our test program to get the reliable and high-performance optical transceivers.

    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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    • High Reliability (5)
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    • After-sales (2)
    • 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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    • 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

      Verified Purchase

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      0

    • 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

      Verified Purchase

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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

      Verified Purchase

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      0

    • 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

      Helpful

      0

    • 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

      Helpful

      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

      Verified Purchase

      Helpful

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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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    Transceivers type QSFP-40G-SR4

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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!

    Verified Purchase

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

    Compatible Cisco

    Transceivers type QSFP-40G-SR4

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