HPE 845398-B21 Compatible 25GBASE-SR SFP28 Transceiver
HP compatible 845398-B21 - Key Features
- Compatibility: HP
- Media Type: Multi-Mode Fiber (MMF) -OM3/OM4/OM5
- Fiber Count: Duplex
- Connector: Double LC/UPC
- Maximum Distance: 100 m
- Average Link Budget: 5.3 dB
- Tx Wavelength: 850 nm
- Supported Data Rate: 8.5 Gbps - 25.78 Gbps
- DDM/DOM: Supported
- Forward Error Correction (FEC): Host FEC Supported
- Temperature Range: Standard 0°-70°C
HP 845398-B21 Price
In Stock - Ships Next Business DayHP compatible 845398-B21 Specifications
Form Factor | SFP28 |
Media Type | Multi-Mode Fiber (MMF) -OM3/OM4/OM5 |
Fiber Count | Duplex |
Connector | Double LC/UPC |
Maximum Distance | 100 m |
Average Link Budget | 5.3 dB |
TX Wavelength | 850 nm |
RX Wavelength | 850 nm |
Supported Data Rate | 8.5 Gbps - 25.78 Gbps |
Supported Ethernet Applications | 10G Ethernet (10.31Gbps), 25G Ethernet (25.78Gbps) |
DDM/DOM | Supported |
Forward Error Correction (FEC) | Host FEC Supported |
Transmitter Type | VSCEL Laser |
Average Launch Power (Min) Each Lane | -5 dBm |
Average Launch Power (Max) Each Lane | 2.4 dBm |
Extinction Ratio (Min) | 3 dB |
Receiver Type | PIN photodiode |
Rx Wavelength Bandwidth | 20 nm |
Average Receiver Sensitivity (Min) Each Lane | -10.3 dBm |
Average Receiver Sensitivity (Max) Each Lane | 2.4 dBm |
Receiver Overload | 2.4 dBm |
Temperature Range | Standard 0°-70°C |
Storage Temperature | -40° to 85°C |
Relative Humidity | 5 to 85% |
Power Consumption (Max) | 0.3 W |
Power | +3.3V single power supply |
Compliance | SFF-8432, CE, Class 1 FDA and IEC60825-1 Laser Safety Compliant, RoHS, SFF-8431, SFF-8472, SFP28 MSA |
HP compatible 845398-B21 Datasheet
v3Complete technical specifications and product details
HP compatible 845398-B21 Description
EdgeOptic's 845398-B21 compatible is an HPE-coded 25GBASE-SR version of the EdgeOptic 25G-SFP28-100 multi-vendor 25GBASE-SR SFP28 transceiver. The module matches the HPE 25Gb SFP28 SR 100m original specification for short-reach 25 Gigabit Ethernet over multimode fiber, and ships with HPE-recognized EEPROM so HPE FlexFabric adapters and ProLiant iLO inventory tools register it as 845398-B21 at link-up.
Optical specs: 850 nm VCSEL transmitter, PIN photodiode receiver, TX power −5 to +2.4 dBm, RX sensitivity better than −10.3 dBm, 5.3 dB link budget. Reach is 100 m on OM4, 100 m on OM5, and 70 m on OM3 multimode fiber with an LC/UPC duplex connector. The module is IEEE 802.3by Clause 112 compliant. RS-FEC per Clause 91 (RS(528,514)) is supported and enabled by the host port when 25GBASE-SR is negotiated.
Electrical interface follows SFF-8431 and SFF-8432 for the SFP28 cage. Digital diagnostics are SFF-8472 compliant, giving per-module temperature, supply voltage, TX bias, TX power, and RX power visibility through iLO and HPE management tools. Power dissipation is 0.3 W and the hot-swappable cage operates across the 0 to 70 C commercial range.
The 845398-B21 is listed on the HPE Store as a Server Transceiver accessory for HPE FlexFabric 25GbE adapter cards including the 640FLR-SFP28, 640SFP28, and 631FLR-SFP28 installed in HPE ProLiant servers. The EEPROM is programmed with the HPE vendor identifier so the module drops into those FlexFabric adapter ports without triggering unsupported-transceiver warnings during POST or adapter firmware checks. For per-server qualification, verify against the HPE QuickSpecs document and the Server Parts Guide for the specific ProLiant generation.
The 845398-B21 is the HPE ProLiant FlexFabric server-side SR transceiver and is distinct from the Aruba JL484A switching SKU even though both are HPE-branded 25G SR SFP28 modules. For ProLiant fleet quantities or mixed adapter populations, contact our sales team. Ships next business day from EU stock with a lifetime warranty. Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms.
Frequently Asked Questions
Will a third-party 845398-B21 compatible transceiver work in HPE ProLiant servers without warnings?
Yes. EdgeOptic's 845398-B21 compatible carries HPE-recognized EEPROM, so HPE FlexFabric adapters and ProLiant iLO inventory register it as a supported 25Gb SFP28 SR module. No unsupported-transceiver warning events on the System Health log.
Which HPE FlexFabric adapters use the 845398-B21?
HPE lists the 845398-B21 as the 25Gb SFP28 SR 100m Server Transceiver for HPE FlexFabric 25GbE adapter cards including the 640FLR-SFP28, 640SFP28, and 631FLR-SFP28 installed in HPE ProLiant servers. For per-server qualification, verify against the HPE QuickSpecs for the specific ProLiant generation.
Is the HPE 845398-B21 the same as the Aruba JL484A transceiver?
No. Both are HPE-branded 25GBASE-SR SFP28 modules, but the 845398-B21 is the Server Transceiver accessory listed on the HPE Store for FlexFabric 25GbE adapter cards in ProLiant servers. The Aruba JL484A is the Aruba switching SKU for Aruba CX 25G switch ports. Order by the SKU printed on the adapter or switch BOM, not by interchanging the two.