HPE QSFP28 to SFP28 Adapter — 849444-001

The HPE 849444-001 is a QSFP28 to SFP28 breakout adapter enabling a single 100GbE QSFP28 port to connect to a 25GbE SFP28 transceiver or device. This adapter allows network equipment with QSFP28 100GbE ports — switches, NICs, and storage controllers — to interface directly with 25GbE SFP28 endpoints, providing flexible 25GbE connectivity from 100GbE QSFP28 infrastructure without additional cabling or media converters. The 849444-001 is a regional/revision variant of the 845970-B21.

Key Features

• QSFP28 to SFP28 adapter — enables 25GbE SFP28 connectivity from 100GbE QSFP28 ports
• Direct physical adapter — no active electronics, media converters, or external power required
• Regional/revision variant of 845970-B21 — interchangeable in supported HPE configurations
• Enables flexible 25GbE SFP28 breakout from 100GbE QSFP28 switch and NIC ports

Product Specifications

• Part Number: 849444-001
• Manufacturer: HPE
• Type: QSFP28 to SFP28 Adapter
• Input: QSFP28 (100GbE)
• Output: SFP28 (25GbE)

Transceiver & Interface Specifications

• Input Interface: QSFP28 — plugs into 100GbE QSFP28 port on switch, NIC, or HBA
• Output Interface: SFP28 — accepts 25GbE SFP28 transceiver for 25GbE connectivity
• Adapter Type: Passive mechanical adapter — no signal conversion or active electronics
• Speed: Enables single-lane 25GbE via one lane of the QSFP28 four-lane interface

Use Cases

• Connecting 25GbE SFP28 servers or appliances to 100GbE QSFP28 switch ports
• 25GbE SFP28 storage or NIC connectivity from HPE switches or controllers with QSFP28 ports
• Flexible 25GbE breakout from 100GbE QSFP28 infrastructure without dedicated 25GbE switch ports
• Field adapter for mixed 25GbE/100GbE environments using HPE QSFP28-capable switches

Compatibility

• HPE switches and NICs with QSFP28 100GbE ports supporting SFP28 adapter mode
• HPE-validated 25GbE SFP28 transceivers for use in the SFP28 output port
• Interchangeable with 845970-B21 in supported HPE QSFP28 configurations

Frequently Asked Questions

Is 849444-001 interchangeable with 845970-B21?

Yes — 849444-001 and 845970-B21 are both HPE QSFP28 to SFP28 adapters with identical function. 849444-001 is the regional/revision variant of 845970-B21 — fully interchangeable in supported HPE QSFP28 port configurations.

Does using a QSFP28 to SFP28 adapter reduce bandwidth on the QSFP28 port?

Yes — a QSFP28 port operates at 100GbE using four 25GbE lanes. When using a QSFP28 to SFP28 adapter, only one lane is used, providing 25GbE to the SFP28 device. The remaining three lanes of the QSFP28 port are unused. This is a breakout use case — the switch port typically shows as 25GbE when the adapter is in use.

Does the QSFP28 port need special configuration to support this adapter?

Some QSFP28 switches require port configuration changes (breakout mode or speed negotiation) to support QSFP28 to SFP28 adapters. Consult your HPE switch or NIC documentation for QSFP28 adapter mode configuration before deploying 849444-001 in production environments.

The HPE 849444-001 QSFP28 to SFP28 adapter enables flexible 25GbE SFP28 connectivity from 100GbE QSFP28 ports in HPE network infrastructure. Order today — in stock at the best price.