HPE 845398-B21 - HPE 25Gb SFP28 SR 100m Transceiver

Brand: HPE | Category: Transceivers & Cables

SKU: HPE-845398-B21 | Part #: 845398-B21 | MPN: 845398-B21

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The HPE 845398-B21 is a 25 Gigabit SFP28 transceiver built for short-reach multimode fiber deployments within enterprise and data centre switching fabrics. Operating at 25 Gbps over the 25GBASE-SR standard, this transceiver reaches 100 meters on OM4 multimode fiber and 70 meters on OM3, making it the right choice for intra-rack, inter-rack, and building-scale network connections where longer-distance single-mode infrastructure is not required. The form factor—SFP28, with its compact dual LC connector—fits into the high-density port layouts that modern switching platforms demand, and the HPE coding ensures seamless compatibility across HPE's switching ecosystem without firmware surprises or compatibility flags during deployment.

Network engineers and infrastructure teams select the 845398-B21 when they need to provision 25 Gigabit links in environments where MMF cabling is already installed or where cost-per-port efficiency matters more than maximum reach. The transceiver uses a VCSEL (Vertical-Cavity Surface-Emitting Laser) light source operating at 850 nanometers—the same wavelength as older gigabit and 10-gigabit multimode transceivers, which can simplify network refresh cycles in brownfield data centres. HPE's implementation of this standard includes full SFF-8472 digital diagnostic monitoring, so your switch fabric gains real-time insight into optical signal strength, laser bias current, and module temperature without requiring external test equipment. The 845398-B21 is hot-pluggable, meaning network operations can insert or remove it from an active port without powering down the switch—a practical necessity in environments where uptime is non-negotiable.

Deployment contexts vary, but the 845398-B21 finds its home in several common scenarios. In a modern hyperscale or enterprise data centre, network architects use these transceivers to build out ToR (Top of Rack) switching tiers where existing multimode cabling runs between racks or floors. Cloud-native teams deploying Kubernetes clusters across multiple physical switches benefit from the straightforward 25 Gigabit throughput without the cost premium of 100 Gigabit infrastructure. Storage administrators bridging SAN fabrics—particularly those using HPE StoreFabric switches—often pair the HPE 845398-B21 with their infrastructure to gain 25 Gbps connectivity at a lower cost-per-link than faster options. Similarly, organizations running AI training clusters that require fast but not extreme bandwidth between compute nodes and storage will find this transceiver's performance profile fits their budget constraints and cabling topology. The transceiver's commercial temperature range of 0°C to 70°C suits standard air-cooled data centre and enterprise closet environments, avoiding the complexity and expense of higher-temperature or extended-range variants.

HPE compatibility extends across the FlexFabric, Aruba CX, and StoreFabric switch portfolios, each of which supports the 25 Gigabit SFP28 form factor. Before ordering, confirm your switch model's SFP28 port count and your existing multimode fiber plant—the difference between OM3 (70-meter reach) and OM4 (100-meter reach) can influence cabling design in larger facilities. The HPE 845398-B21 carries HPE's firmware and compatibility certifications, so you avoid the support friction that sometimes arises when mixing vendor transceiver modules. From a provisioning standpoint, network engineers appreciate the standardization: one part number, one wavelength, one reach specification, and one vendor to call if a module fails. The digital diagnostics—transmit power, receive power, laser bias, temperature—integrate directly into HPE's management and monitoring platforms, reducing the need for separate optical testing tools during troubleshooting or validation.

Omnixon Global stocks the HPE 845398-B21 for rapid deployment across the GCC, Asia, and Europe. As a dedicated B2B enterprise hardware distributor based in Dubai, we maintain inventory alignment with data centre refresh cycles and support the procurement timelines that large enterprises and hosting providers require. Request a quotation today for volume orders, integration with your existing HPE infrastructure, or consultation on module selection for your switching platform.

Interface & Connectivity Specifications

• SFP28 form factor with dual LC connectors; fits standard 25 Gigabit-capable switch ports in HPE FlexFabric, Aruba CX, and StoreFabric switching platforms
• 25GBASE-SR protocol (IEEE 802.3by) at 25 Gbps; 850 nm VCSEL wavelength compatible with existing multimode fiber infrastructure
• Maximum reach 100 meters on OM4 multimode fiber; 70 meters on OM3; suitable for intra-facility and inter-building connections in standard data centre environments
• SFF-8472 digital diagnostic monitoring reports real-time transmit/receive power, laser bias, and temperature without external test instruments
• Hot-pluggable design allows insertion and removal during active port operation; no switch reboot or service window required
• HPE-coded transceiver with full compatibility certification across HPE switching portfolios; eliminates firmware version or compatibility matrix lookups
• Commercial operating temperature range 0°C to 70°C suits standard air-cooled data centre and enterprise network closet deployments
• Part number HPE 845398-B21 for procurement, RMA, and inventory tracking across multi-site enterprise and hosting environments