This item, 845398-B21, is the HPE option part number for the product described as 25Gb SFP28 SR 100m Transceiver. Further details below.
The HPE 25Gb SFP28 SR 100m Transceiver (845398-B21) is a high-performance, short-range optical module engineered to meet the demanding connectivity requirements of modern enterprise and data center environments. Delivering 25 Gbps data rates over multimode fiber (MMF), it ensures efficient and reliable connectivity across distances up to 100 meters on OM4 fiber and 70 meters on OM3 fiber. Operating at an 850nm wavelength, the module utilizes a vertical-cavity surface-emitting laser (VCSEL) transmitter and a PIN photodiode receiver, ensuring optimal performance over MMF. Its hot-swappable SFP28 form factor simplifies installation and enables quick replacement without disrupting network operations - making it an ideal choice for server interconnects, storage networks, and high-speed data transmission workloads.
Built to the highest industry standards, the HPE 845398-B21 is fully compliant with the SFP28 Multi Source Agreement (MSA SFF-8402), and carries RoHS and CE certifications for broad regulatory compliance. With support for Digital Diagnostic Monitoring (DDM), the module allows network administrators to monitor key parameters such as temperature, voltage, and optical power levels, facilitating proactive maintenance and minimizing downtime. Designed to operate within a commercial temperature range of 0°C to 70°C, the HPE 845398-B21 is suitable for a variety of deployment scenarios - from hyperscale data centers to enterprise campus networks - while its efficient heat dissipation and low power consumption contribute to energy savings and a reduced environmental footprint.
HPE Option Part #: 845398-B21
HPE Spare Part #: 849442-001
PRODUCT SPECIFICATIONS FOR 845398-B21:
- Form Factor: SFP28 Plug-in Module
- Data Transfer Rate: 25 Gbps
- Cabling Type: 25GBase-SR
- Data Link Protocol: 25 Gigabit Ethernet
- Max Transfer Distance: 100m (OM4 MMF) / 70m (OM3 MMF)
- Wavelength: 850nm
- Transmitter Type: VCSEL (Vertical-Cavity Surface-Emitting Laser)
- Receiver Type: PIN Photodiode
- Connector Type: LC Duplex, Multi-Mode
- Interface: 1 x Ethernet 25GBase-SR - LC Multi-Mode x 2
- Optical Budget: 2.6 dB (minimum guaranteed)
- Operating Temperature: 0°C to 70°C (Commercial)
- Hot-Swappable: Yes
- Digital Diagnostic Monitoring: Yes (DDM/DOM)
- Duplex: Full Duplex
- Compliance: SFP28 MSA (SFF-8402), RoHS, CE, CPRI, eCPRI
Last Updated: 2026-05-07
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This product is warrantied against hardware failure for a period of 1 Year from the date of purchase. Before making a purchase, please take a moment to review our return policy below.
Returns
It is the customer's responsibility to verify compatibility with their machine(s) before placing an order. If an item is ordered by mistake, it can be returned for refund, minus a 25% restocking fee, within 5 business days of receipt. The cost of freight is not refundable.
Please be aware that factory-sealed equipment can only be returned if it remains unopened.
Defective Products
If you have received a defective part and your machine is still within the HPE warranty period, please initiate a warranty exchange by visiting the HPE Enterprise Support Center. Be sure to have the serial numbers of the defective drive and your server/storage array handy.
In case your hardware becomes defective during the Global One warranty period, but the HPE warranty has expired, you can return the product to us for a working replacement. You are responsible for the shipment of returned merchandise. However, we will cover the expense of Ground /Economy shipment for the replacement item(s).
Requesting an RMA
To initiate a return or warranty claim, please complete and submit the RMA Request Form.
