Replacement for TN-SFP-LXB21: Drop-In Alternatives We Stock
Looking for a replacement for the TN-SFP-LXB21 (TN-SFP-LXB21 - Transition 1000Base-LX 1310nmTX/1550nmRX 20km LC Transceiver Module)? Pro Disk Network ships drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the TN-SFP-LXB21
| SKU | TN-SFP-LXB21 |
|---|---|
| Product | TN-SFP-LXB21 - Transition 1000Base-LX 1310nmTX/1550nmRX 20km LC Transceiver Module |
| Current price | $124.51 |
| Stock status | In Stock |
| Detail page | View TN-SFP-LXB21 › |
Drop-in replacements for TN-SFP-LXB21
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
SFP-10G-BXU-20KM - Cisco 10GBase-BX-U 1270TX / 1330RX 20km SFP+ Transceiver Module
SKU: SFP-10G-BXU-20KM
Price: $926.57
SFP-10G-BXD-20KM - Cisco 10GBase-BX-D 1330TX / 1270RX 20km SFP+ Transceiver Module
SKU: SFP-10G-BXD-20KM
Price: $926.57
GLC-BX-U-20KM - Cisco 1Gbps 1000Base-BXU Single-mode Fiber 1310nm TX/1490nm RX 20km SFP Transceiver Module
SKU: GLC-BX-U-20KM
Price: $114.36
TN-SFP-LXB22 - Transition 1000Base-LX 20km 1550nmTX/1310nmRX LC Connector SFP Transceiver Module
SKU: TN-SFP-LXB22
Price: $143.76
TN-SFP-OC3S-TELUS - Transition Networks 155Mbps 1310nm SM 20km OC 3.3V W/DMI LC Connector SFP Transceiver Module
SKU: TN-SFP-OC3S-TELUS
Price: $376.67
TN-SFP-OC12S - Transition Network 622Mb/s OC-12/STM-4 1310nm Single-Mode Fiber 20km LC Connector SFP Transceiver Module
SKU: TN-SFP-OC12S
Price: $409.43
X2-10GB-LR-20KM - Cisco 10Gbps 10GBase-LR Single-Mode Fiber 20km 1310nm Duplex SC Connector X2 Transceiver Module
SKU: X2-10GB-LR-20KM
Price: $306.68
XFP-10G-BX-U-20KM - Cisco 10GBase-BX-U 1270TX / 1330RX 20km XFP Transceiver Module
SKU: XFP-10G-BX-U-20KM
Price: $594.37
XFP-10G-BX-D-20KM - Cisco 10GBase-BX-D 1330TX / 1270RX 20km XFP Transceiver Module
SKU: XFP-10G-BX-D-20KM
Price: $594.37
TN-SFP-BXD2 - Transition 1Gbps 1000Base-BX 1490nm TX/1310nm RX 20km LC Transceiver Module
SKU: TN-SFP-BXD2
Price: $111.42
TN-SFP-BXU2 - Transition 1Gbps 1000Base-BX 1310nm TX/1490nm RX 20km LC Transceiver Module
SKU: TN-SFP-BXU2
Price: $124.51
TN-10GSFP-LR2 - Transition 10Gbps 10GBase-LR/LW Single-mode Fiber SFP+ 1310nm (LC) 20km Transceiver Module
SKU: TN-10GSFP-LR2
Price: $148.13
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.