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 SFP28 transceiver engineered for HPE ProLiant servers and HPE FlexFabric 25Gb adapter cards. The module matches the HPE 845398-B21 original specification for short-reach 25 Gigabit Ethernet over multimode fiber.
Optical specs: 850 nm VCSEL transmitter, PIN photodiode receiver, TX power -8.4 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 and runs RS-FEC via Clause 91 (RS(528,514)) as defined for 25GBASE-SR.
Electrical interface follows SFF-8431 and SFF-8432 for the SFP28 cage. Digital diagnostics are SFF-8472 compliant, giving per-lane temperature, supply voltage, TX bias, TX power, and RX power visibility through iLO, ilorest, and standard SNMP MIBs. Power dissipation is 0.3 W and the hot-swappable cage is hardened for a 0-70 C commercial operating range.
EEPROM is programmed with the HPE vendor identifier so HPE ProLiant iLO and firmware inventory tools register the module as a recognized 845398-B21. The module drops into HPE 640FLR-SFP28, 640SFP28, 631FLR-SFP28, and other HPE FlexFabric 25 GbE adapter ports without generating unsupported-transceiver warnings during POST or adapter firmware checks.
The 845398-B21 is deployed across HPE ProLiant Gen9, Gen10, and Synergy platforms, and stays clearly differentiated from the Aruba JL484A switching SKU even though both are HPE-branded. For HPE ProLiant Gen10 or Synergy deployments needing matched bulk quantities, contact our sales team.
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 ProLiant iLO and adapter firmware register it as a supported 25Gb SFP28 SR module without warning events on the System Health log or in iLO inventory.
Which HPE adapters and ProLiant platforms use the 845398-B21?
The 845398-B21 is deployed across HPE FlexFabric 25 GbE adapter cards including the 640FLR-SFP28, 640SFP28, and 631FLR-SFP28, installed in HPE ProLiant Gen9 and Gen10 servers. It is the ProLiant-line 25G SR SFP28 accessory and is distinct from the HPE Aruba JL484A switching SKU.
Does the 845398-B21 require a specific adapter firmware version?
HPE documented a firmware-level issue on adapter firmware 14.29.1016 affecting a subset of 845398-B21 units. HPE's patched firmware resolves it. The issue was an HPE adapter firmware bug, not a transceiver compatibility issue. EdgeOptic's 845398-B21 compatible operates on any HPE-supported adapter firmware revision.
What fiber type and distance does the 845398-B21 support?
The 845398-B21 is a short-reach 25GBASE-SR module using 850 nm VCSEL over multimode fiber. Maximum reach is 100 m on OM4 or OM5 and 70 m on OM3 with an LC/UPC duplex connector. Total channel insertion loss must stay within the 5.3 dB link budget defined by IEEE 802.3by Clause 112.